WO2010146710A1 - 四フッ化ホウ酸塩の製造方法 - Google Patents
四フッ化ホウ酸塩の製造方法 Download PDFInfo
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- WO2010146710A1 WO2010146710A1 PCT/JP2009/061216 JP2009061216W WO2010146710A1 WO 2010146710 A1 WO2010146710 A1 WO 2010146710A1 JP 2009061216 W JP2009061216 W JP 2009061216W WO 2010146710 A1 WO2010146710 A1 WO 2010146710A1
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- tetrafluoroborate
- boron trifluoride
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B35/00—Boron; Compounds thereof
- C01B35/06—Boron halogen compounds
- C01B35/063—Tetrafluoboric acid; Salts thereof
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B35/00—Boron; Compounds thereof
- C01B35/06—Boron halogen compounds
- C01B35/063—Tetrafluoboric acid; Salts thereof
- C01B35/066—Alkali metal tetrafluoborates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0568—Liquid materials characterised by the solutes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a method for producing tetrafluoroborate and an apparatus for producing the same, and more specifically, a method for producing tetrafluoroborate applicable to an electrolytic solution of a power storage element, tetrafluoroborate
- the present invention relates to an electrolyte solution including the same and a power storage element including the electrolyte solution.
- a method for producing lithium tetrafluoroborate for example, there is a method of obtaining lithium tetrafluoroborate by acting lithium carbonate on a borofluoric acid solution. It is done. Since the salt produced by this method is lithium borofluoride monohydrate represented by LiBF 4 .H 2 O, dehydration by heating at about 200 ° C. is required. However, heating at about 200 ° C. degrades the purity of lithium tetrafluoroborate because it decomposes lithium tetrafluoroborate. Moreover, several thousand ppmw of water remains. Therefore, this production method is not necessarily sufficient in terms of controllability of the reaction, purity of the product obtained, and the like.
- Patent Document 1 boron trifluoride gas is blown into a non-aqueous organic solvent for lithium secondary battery electrolyte containing lithium fluoride, and lithium fluoride and boron trifluoride are injected.
- a method for producing lithium tetrafluoroborate by reacting is disclosed.
- the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a tetrafluoroborate production method that enables efficient production of tetrafluoroborate with high yield by a continuous process. It is another object of the present invention to provide an electrolytic solution containing tetrafluoroborate and a power storage device including the electrolytic solution.
- the inventors of the present application have studied a method for producing tetrafluoroborate, an electrolytic solution containing tetrafluoroborate, and an electricity storage device including the electrolytic solution. As a result, the inventors have found that the object can be achieved by adopting the following configuration, and have completed the present invention.
- the method for producing tetrafluoroborate according to the present invention is equivalent to the first step of dissolving boron trifluoride gas in an organic solvent and the boron trifluoride in order to solve the above problems.
- a second step in which a stoichiometric amount of fluoride (MF n , M is a metal or NH 4 , 1 ⁇ n ⁇ 3) is added to the organic solvent to form a tetrafluoroborate solution.
- Fluoride is generally poorly soluble in organic solvents. Therefore, when fluoride is added to the organic solvent prior to absorption of boron trifluoride gas, it enters a suspended (slurry) state. For this reason, at the time of absorption of boron trifluoride, clogging with solid fluoride occurs inside the apparatus, which hinders operation.
- boron trifluoride gas is absorbed in the organic solvent in the first step, and then fluoride is added to the organic solvent in the second step. Thereby, tetrafluoroborate is synthesized in an organic solvent as shown in the following chemical reaction formula.
- the amount of fluoride added is stoichiometrically equivalent to or less than boron trifluoride, all of the fluoride reacts with boron trifluoride. As a result, a non-slurry tetrafluoroborate solution with no unreacted fluoride remaining is obtained. Thereby, the tetrafluoroborate solution can be circulated to the first step, and boron trifluoride gas can be dissolved in the tetrafluoroborate solution instead of the organic solvent (third). Process). That is, in the above method, various apparatuses including an absorption tower can be used, and continuous operation is also possible, so that the productivity of tetrafluoroborate can be improved.
- the organic solvent is preferably a non-aqueous organic solvent or a non-aqueous ionic liquid. This makes it possible to absorb boron trifluoride without hydrolysis of boron trifluoride or tetrafluoroborate, and by-product of boron trifluoride or tetrafluoroborate hydrate. it can.
- boron trifluoride or tetrafluoroborate is hydrolyzed, oxyfluoroborate, borate, etc. are used against acidic substances such as oxyfluoroboric acid, hydrofluoric acid and boric acid, or organic solvents. Produces insoluble components.
- the water concentration of the organic solvent is preferably 100 ppmw or less, more preferably 10 ppmw or less, and particularly preferably 1 ppmw or less.
- the first step and the third step can be performed using an absorption tower.
- the boron trifluoride gas is dissolved in the organic solvent and tetrafluoroborate solution, and then the fluoride is added. Therefore, the suspension (slurry) state is not caused. For this reason, even if an absorption tower is used in the first step and the third step, it is possible to prevent clogging from occurring in the inside and to enable continuous operation. As a result, the productivity of tetrafluoroborate can be improved.
- the electrolytic solution according to the present invention includes tetrafluoroborate obtained by the method for producing tetrafluoroborate described above.
- a power storage device includes the above-described electrolytic solution.
- a lithium ion secondary battery etc. are mentioned as an electrical storage element of this invention.
- the present invention has the following effects by the means described above.
- a stoichiometric amount of a fluorine equivalent to or less than that of boron trifluoride in the reaction vessel is used in comparison with an organic solvent in which boron trifluoride gas is previously dissolved in the absorption tower. Since both compounds are reacted with each other, a tetrafluoroborate solution containing no fluoride is obtained. The obtained tetrafluoroborate solution was again supplied to the absorption tower and circulated, and after boron trifluoride gas was dissolved in this tetrafluoroborate, React with boron trifluoride.
- a high-purity tetrafluoroborate having no unreacted fluoride and impurities is produced by a continuous production process by circulating a tetrafluoroborate solution. be able to. Moreover, the filtration process for removing a fluoride becomes unnecessary, and it is economically excellent.
- FIG. 5 is a schematic diagram for explaining Examples 2 to 5 of the present invention. It is explanatory drawing which shows roughly sectional drawing of the lithium secondary battery of this invention.
- FIG. 1 is an explanatory view schematically showing a tetrafluoroborate manufacturing apparatus according to the present embodiment. However, parts that are not necessary for the description are omitted, and there are parts that are illustrated in an enlarged or reduced manner for ease of explanation.
- the manufacturing apparatus includes a first absorption tower 1 and a second absorption tower 5, a first tank 2, a second tank 6, a third tank 10, a pump 3, 7 and 11, a first cooler 4 and a second cooler 8, a deaeration tower 9, an air pump 12, and a condenser 13.
- a predetermined amount of organic solvent is put into the first tank 2 and the second tank 6.
- the liquids in the first tank 2 and the second tank 6 are supplied to the first absorption tower 1 and the second absorption tower 5 by the pumps 3 and 7, respectively, and the circulation operation is performed.
- boron trifluoride (BF 3 ) gas is supplied to the bottom of the second absorption tower 5.
- Boron trifluoride may be 100%, or may be appropriately diluted by mixing an inert gas.
- Heat generation in the first absorption tower 1 and the second absorption tower 5 can be reduced by mixing the inert gas.
- hydrogen fluoride for example N 2, Ar, dry air, carbon dioxide, and the like.
- the water in the inert gas used for dilution is 100 ppmw so as not to by-produce boron trifluoride or tetrafluoroborate hydrolysis and boron trifluoride or tetrafluoroborate hydrate.
- the following low moisture content is preferable, 10 ppmw or less is more preferable, and 1 ppmw or less is particularly preferable.
- Boron trifluoride gas is dissolved in the organic solvent by making countercurrent contact with the organic solvent in the second absorption tower 5 (first step). Absorption heat of boron trifluoride into the organic solvent is removed by the first cooler 4 and the second cooler 8 provided in the circulation line, and maintained at an appropriate operating temperature.
- the organic solvent in which boron trifluoride gas is dissolved is supplied to the second tank 6.
- the second tank 6 is supplied with a stoichiometric amount of fluoride equivalent to or less than boron trifluoride.
- boron trifluoride and fluoride react to generate tetrafluoroborate (second step).
- the following reaction formula shows the reaction between boron trifluoride and lithium fluoride.
- the tetrafluoroborate solution produced in the second tank 6 is sent out by a pump 7 through a pipe and supplied to the top of the second absorption tower 5. Boron trifluoride supplied to the bottom of the tower is absorbed in the tetrafluoroborate solution in the second absorption tower (third step). Subsequently, the reaction with the fluoride is continuously performed in the second tank 6 to increase the tetrafluoroborate to a desired concentration. By performing such a circulation operation, when a predetermined concentration is reached, a part of the solution from the pump 7 is extracted as a product.
- the supply of the organic solvent from the outside to the first absorption tower 1 is started, and the liquid supply destination of the pump 3 is switched from the first absorption tower 1 to the second absorption tower 5 to obtain tetrafluoroborate
- the continuous production of the solution is performed.
- the absorption liquid may be supplied to the second absorption tower 5 while continuing to circulate a part of the absorption liquid to the first absorption tower 1 at the same time.
- the amount of fluoride supplied to the second tank 6 is equivalent to that of boron trifluoride dissolved in the organic solvent in order to avoid the presence of a fluoride that is sparingly soluble in the organic solvent in the form of a slurry. Or a stoichiometric amount of less than that. Thereby, it is possible to avoid clogging or the like due to the slurry-like fluoride in the apparatus.
- a method of making the boron trifluoride stoichiometrically excessive with respect to the fluoride can be realized by always supplying a stoichiometric excess of boron trifluoride with respect to the fluoride.
- the excess boron trifluoride must be discharged out of the system in any step, which is not preferable because it causes loss of raw materials.
- a method by which boron trifluoride and fluoride are supplied in a stoichiometrically equivalent manner to a liquid in which an excessive amount of boron trifluoride suitable for operation in advance is absorbed is more preferable.
- the tetrafluoroborate solution in which boron trifluoride used in the second step is excessively dissolved is supplied to the top of the second absorption tower in the third step. 9 is also supplied. Further, the tetrafluoroborate solution sent to the deaeration tower 9 is depressurized by the air pump 12, and boron trifluoride is distilled off. Thereby, boron trifluoride and fluoride are adjusted to a solution of tetrafluoroborate in which the stoichiometric equivalent is obtained, and is extracted from the third tank 10 as a product.
- the deaeration tower 9 may be provided with a heater and heated.
- the distilled boron trifluoride is supplied to the bottom of the second absorption tower 5 by the air pump 12. Furthermore, it is recovered and reused by bringing it into countercurrent contact with the organic solvent and / or tetrafluoroborate solution in the second absorption tower 5.
- the tetrafluoroborate solution is depressurized with an air pump 12 to distill off the hydrogen fluoride, and then the condenser 13 Hydrogen fluoride may be condensed and removed.
- the liquid (drain) condensed in the condenser 13 contains an organic solvent, hydrogen fluoride, and boron trifluoride.
- the liquid may be discarded after being subjected to waste liquid treatment, or hydrogen fluoride, boron trifluoride or
- the organic solvent may be recovered and reused as necessary.
- a recovery method a normal method such as distillation or extraction can be used.
- the first absorption tower 1 and the second absorption tower 5 can use any type of tower-type absorber such as a packed tower, a plate tower, and a wet wall tower. Furthermore, the type of absorption may be either countercurrent or cocurrent.
- the concentration of boron trifluoride in the organic solvent or tetrafluoroborate solution is preferably 15% by weight or less, more preferably 10% by weight or less, and more preferably 5% by weight.
- the gas-liquid contact temperature between the boron trifluoride gas and the organic solvent or tetrafluoroborate solution is preferably ⁇ 40 to 100 ° C., preferably 0 to More preferably, it is 60 ° C.
- the gas-liquid contact temperature is less than ⁇ 40 ° C.
- the organic solvent is solidified and continuous operation cannot be performed.
- the gas-liquid contact temperature exceeds 100 ° C.
- the vapor pressure of boron trifluoride in the organic solvent and tetrafluoroborate solution becomes too high, and the absorption efficiency decreases. There is a disadvantage that a reaction of boron occurs.
- the organic solvent is preferably at least one of a non-aqueous organic solvent and a non-aqueous ionic liquid. Moreover, as the non-aqueous organic solvent, a non-aqueous aprotic organic solvent is more preferable. Since it is not capable of donating hydrogen ions when it is aprotic, the solution of tetrafluoroborate obtained by the production method of the present invention is applied as it is to the electrolytic solution of a storage element such as a lithium ion secondary battery. be able to.
- the non-aqueous organic solvent is not particularly limited, and for example, ethylene carbonate, propylene carbonate, butylene carbonate, vinylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, methyl acetate, ethyl acetate, ⁇ -butyl lactone, acetonitrile, dimethyl
- Examples include formamide, 1,2-dimethoxyethane, methanol, isopropanol and the like.
- organic solvents from the viewpoint of continuous production, the produced tetrafluoroborate is difficult to precipitate, that is, ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, Methyl ethyl carbonate, acetonitrile and 1,2-dimethoxyethane are preferred.
- non-aqueous organic solvents may be used alone or in combination of two or more.
- non-aqueous aprotic organic solvent examples include a cyclic carbonate ester, a chain carbonate ester, a carboxylic acid ester, a nitrile, an amide, or an ether compound. These non-aqueous aprotic organic solvents may be used alone or in combination of two or more.
- non-aqueous ionic liquid is not particularly limited, and examples thereof include fluoride complex salts or fluoride salts such as quaternary ammonium or quaternary phosphonium.
- quaternary ammonium cations include tetraalkylammonium cations, imidazolium cations, pyrazolium cations, pyridinium cations, triazolium cations, pyridazinium cations, thiazolium cations, oxazolium cations, and pyrimidinium.
- a cation, a pyrazinium cation, etc. are mentioned.
- examples of the quaternary phosphonium cation include a tetraalkylphosphonium cation.
- These non-aqueous ionic liquids may be used alone or in combination of two or more, or may be used by dissolving in the non-aqueous organic solvent.
- the organic solvent may be a non-aqueous organic solvent or a non-aqueous ionic liquid, or a mixture of two or more.
- the fluoride added in the second step is not limited to LiF, but NaF, KF, RbF, CsF, NH 4 F, AgF, CaF 2 , MgF 2 , BaF 2 , ZnF 2 , CuF 2 , PbF 2 , AlF 3 , FeF 3 and the like. These fluorides may be used alone or in combination of two or more.
- the reaction temperature between the fluoride and boron trifluoride gas is preferably ⁇ 50 ° C. to 200 ° C., more preferably ⁇ 10 to 100 ° C., and particularly preferably 0 ° C. to 50 ° C. If it is lower than ⁇ 50 ° C., the organic solvent may be solidified or tetrafluoroborate may be precipitated. On the other hand, when it exceeds 200 ° C., the produced tetrafluoroborate may be decomposed.
- tetrafluoroborate can also be taken out by precipitating tetrafluoroborate by concentrating and / or cooling and separating from the solvent. .
- the obtained tetrafluoroborate solution may be used as an electrolytic solution of an electricity storage element as it is, or a non-aqueous aprotic organic solvent, a non-aqueous ionic liquid, or a mixture of two or more. May be used.
- the boron component-containing gas used in the production of tetrafluoroborate is preferably absorbed in an absorption liquid and recovered and reused.
- the absorbing liquid include water, hydrofluoric acid aqueous solution, and M (M salt is selected from the group consisting of Li, Na, K, Rb, Cs, NH 4 , Ag, Mg, Ca, Ba, Fe, and Al.
- M salt is selected from the group consisting of Li, Na, K, Rb, Cs, NH 4 , Ag, Mg, Ca, Ba, Fe, and Al.
- a solution containing a carbonate, a hydroxide, or a halide containing at least one of the above are examples of the absorbing liquid.
- 0 to 80% by weight of water or an aqueous solution of hydrogen fluoride, or M salt M is Li, Na, K, Rb, Cs, NH 4 , Ag, Mg, Ca, Ba, Fe, and Al.
- M is Li, Na, K, Rb, Cs, NH 4 , Ag, Mg, Ca, Ba, Fe, and Al.
- boron trifluoride flowing out from the second absorption tower 5 during the production of tetrafluoroborate is converted to boron trifluoride in the first absorption tower 1 connected in series as shown in FIG. to recover.
- the organic solvent containing boron trifluoride obtained in the first absorption tower 1 is supplied to the second absorption tower 5.
- Boron trifluoride that could not be absorbed by the first absorption tower 1 may be recovered and reused by the absorption method described above. Thereby, even when an excessive amount of boron trifluoride gas is used, the entire amount is used, and loss of raw materials can be suppressed.
- Example 1 In this example, the apparatus shown in FIG. 1 was used. After charging 3L of commercially available battery grade diethyl carbonate (moisture concentration 9ppmw) into the first tank 2 and the second tank 6 made of fluororesin, start circulating operation in each absorption tower and tank using pumps 3 and 7 did. At this time, the flow rates of the pump 3 and the pump 7 were both 1 L / min. Moreover, the 1st tank 2 and the 2nd tank 6 were made constant temperature of 20 degreeC using the 1st cooler 4 and the 2nd cooler 8, respectively.
- moisture concentration 9ppmw moisture concentration 9ppmw
- the diethyl carbonate solution of lithium tetrafluoroborate thus obtained had an insoluble component of 10 ppmw or less, a free acid of 10 ppmw or less, and a water content of 10 ppmw or less. Moreover, the obtained diethyl carbonate solution of lithium tetrafluoroborate was further depressurized at 40 ° C. to distill off the diethyl carbonate to obtain a white solid. As a result of XRD analysis of the white solid, it was confirmed to be lithium tetrafluoroborate.
- Example 2 In this example, the apparatus shown in FIG. 2 was used.
- Commercially available battery-grade diethyl carbonate 500 g (water concentration 9 ppmw) was put in a second tank 6 made of fluororesin, supplied to the top of the second absorption tower 5 with a pump 7 and circulated.
- the second tank 6 was kept constant at 20 ° C. using a cooler 8.
- boron trifluoride gas was supplied to the bottom of the second absorption tower 5 at a flow rate of 0.5 L / min for 16.7 minutes, and 22.6 g was introduced (first step).
- the diethyl carbonate solution of lithium tetrafluoroborate thus obtained had an insoluble component of 10 ppmw or less, a free acid of 10 ppmw or less, and a water content of 10 ppmw or less.
- the obtained diethyl carbonate solution of lithium tetrafluoroborate was decompressed with an air pump 12 at 40 ° C. to distill off the diethyl carbonate to obtain a white solid. As a result of XRD analysis of the white solid, it was confirmed to be lithium tetrafluoroborate.
- Example 3 In this example, the apparatus shown in FIG. 2 was used. Commercially available battery-grade diethyl carbonate 250 g (water concentration 9 ppmw) and ethylene carbonate 250 g (water concentration 7 ppmw) are placed in a second tank 6 made of fluororesin, and supplied to the top of the second absorption tower 5 with a pump 7 and circulated. It was. The second tank 6 was kept constant at 20 ° C. using a cooler 8. Next, boron trifluoride gas was supplied to the bottom of the second absorption tower 5 at a flow rate of 0.5 L / min for 25.5 minutes, and 34.6 g was introduced (first step).
- a coin-type non-aqueous electrolyte lithium secondary battery as shown in FIG. 3 was manufactured using the solution thus obtained, and the performance as an electrolyte was evaluated by a charge / discharge test. Specifically, the procedure was as follows.
- ⁇ Creation of negative electrode 22 Natural graphite and binder polyvinylidene fluoride (PVdF) were mixed at a weight ratio of 9: 1, and N-methylpyrrolidone was added thereto to obtain a paste. This paste was uniformly applied onto a copper foil having a thickness of 22 ⁇ m using an electrode applicator. This was vacuum-dried at 120 ° C. for 8 hours, and a negative electrode 22 having a diameter of 16 mm was obtained with an electrode punching machine.
- PVdF binder polyvinylidene fluoride
- This paste was uniformly applied onto a copper foil having a thickness of 22 ⁇ m using an electrode applicator. This was vacuum-dried at 120 ° C. for 8 hours, and a positive electrode 21 having a diameter of 16 mm was obtained with an electrode punching machine.
- Example 4 In this example, the apparatus shown in FIG. 2 was used. 500 g of commercially available dehydrated methanol (water concentration 9 ppmw) was placed in a second tank 6 made of fluororesin and introduced into the top of the second absorption tower 5 with a pump 7 to circulate the organic solvent. The second tank 6 was kept constant at 20 ° C. using a cooler 8. Next, boron trifluoride gas was supplied to the bottom of the second absorption tower 5 at a flow rate of 0.5 L / min for 25.5 minutes, and 34.6 g was introduced (first step).
- the methanol solution of lithium tetrafluoroborate thus obtained had an insoluble component of 10 ppmw or less, a free acid of 10 ppmw or less, and a water content of 10 ppmw or less.
- the obtained methanol solution of lithium tetrafluoroborate was bubbled with nitrogen at 5 L / min at a constant temperature of 60 ° C., and a part of the methanol was evaporated to deposit a white solid.
- This solution was filtered, and methanol was distilled off while purging the resulting white solid at 60 ° C. and nitrogen at 5 L / min.
- XRD analysis of the obtained white solid it was confirmed to be lithium tetrafluoroborate.
- Example 5 In this example, the apparatus shown in FIG. 2 was used. 500 g (water concentration 550 ppmw) of commercially available battery grade diethyl carbonate mixed with water was placed in a second tank 6 made of fluororesin, supplied to the top of the second absorption tower 5 with a pump 7 and circulated. The second tank 6 was kept constant at 20 ° C. using a cooler 8. Next, boron trifluoride gas was supplied to the bottom of the second absorption tower 5 at a flow rate of 0.5 L / min for 17 minutes, and 22.6 g was introduced (first step).
- a liquid lithium secondary battery was prepared and performance as an electrolyte was evaluated by a charge / discharge test. As a result, the initial charge / discharge efficiency induced water electrolysis. When 150 cycles of charge / discharge were repeated, the decrease in charge capacity could be suppressed to about 20%. Moreover, the coin cell after 150 cycles showed a slight expansion.
- Comparative Example 1 This comparative example was performed using the apparatus shown in FIG. After charging 3L of commercially available battery grade diethyl carbonate (moisture concentration 9ppmw) into the first tank 2 and the second tank 6 made of fluororesin, start circulation operation in each absorption tower and tank using pumps 3 and 7 did. At this time, the flow rates of the pump 3 and the pump 7 were both 1 L / min. Moreover, the 1st tank 2 and the 2nd tank 6 were made constant temperature of 20 degreeC using the coolers 4 and 8, respectively.
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Abstract
Description
これらの非水性非プロトン性有機溶媒は一種単独で、又は二種以上を混合して用いてもよい。
本実施例は図1に示す装置を用いて行なった。市販電池グレードのジエチルカーボネート(水分濃度9ppmw)をフッ素樹脂製の第1槽2及び第2槽6にそれぞれ3L仕込んだ後、ポンプ3及び7を用いて各吸収塔及び槽での循環運転を開始した。このとき、ポンプ3及びポンプ7の流量はともに1L/minとした。また、第1槽2及び第2槽6はそれぞれ第1冷却器4及び第2冷却器8を用いて20℃の恒温にした。
本実施例は図2に示す装置を用いて行なった。市販電池グレードのジエチルカーボネート500g(水分濃度9ppmw)をフッ素樹脂製の第2槽6に入れ、ポンプ7で第2吸収塔5の塔頂部に供給し、循環させた。第2槽6は冷却器8を用いて20℃の恒温にした。次に、第2吸収塔5の塔底部に三フッ化ホウ素ガスを流量0.5L/minで16.7分間供給し、22.6gを導入した(第1工程)。
本実施例は図2に示す装置を用いて行なった。市販電池グレードのジエチルカーボネート250g(水分濃度9ppmw)とエチレンカーボネート250g(水分濃度7ppmw)をフッ素樹脂製の第2槽6に入れ、ポンプ7で第2吸収塔5の塔頂部に供給し、循環させた。第2槽6は冷却器8を用いて20℃の恒温にした。次に、第2吸収塔5の塔底部に三フッ化ホウ素ガスを流量0.5L/minで25.5分間供給し、34.6gを導入した(第1工程)。
天然黒鉛と結着剤のポリフッ化ビニリデン(PVdF)を9:1の重量比で混合し、これにN-メチルピロリドンを加え、ペーストを得た。このペーストを厚さ22μmの銅箔上に電極塗工用アプリケーターを用いて均一に塗工した。これを120℃で8時間、真空乾燥し、電極打ち抜き機で直径16mmの負極22を得た。
LiCoO2粉末と導電助剤のアセチレンブラックと結着剤のPVdFを90:5:5の重量比で混合し、この混合物にN-メチルピロリドンを加え、ペーストを得た。このペーストを厚さ22μmの銅箔上に電極塗工用アプリケーターを用いて均一に塗工した。これを120℃で8時間、真空乾燥し、電極打ち抜き機で直径16mmの正極21を得た。
正極21を正極缶24の底面に載せ、その上にポリプロピレン製多孔質セパレーター23を載置した後、実施例2で調製した非水性電解液を注入し、ガスケット26を挿入した。その後、セパレーター23の上に負極22、スペーサー27、スプリング28及び負極缶25を順々に載置し、コイン型電池かしめ機を使用して、正極缶24の開口部を内方へ折り曲げることにより封口し、非水電解液リチウム二次電池を作成した。続いて、充電を0.4mAの一定電流で行い、電圧が4.1Vに到達した時点で4.1V、1時間定電圧充電した。放電は1.0mAの定電流で行い、電圧が3.0Vになるまで放電した。電圧が3.0Vに到達したら3.0V、1時間保持し充放電サイクルにより充放電試験を実施した。その結果、充放電効率はほぼ100%で、充放電を150サイクル繰り返した所、充電容量は変化しなかった。
本実施例は図2に示す装置を用いて行なった。市販の脱水メタノール500g(水分濃度9ppmw)をフッ素樹脂製の第2槽6に入れポンプ7で第2吸収塔5の塔頂部へ導入して前記有機溶媒を循環させた。第2槽6は冷却器8を用いて20℃の恒温にした。次に、第2吸収塔5の塔底部に三フッ化ホウ素ガスを流量0.5L/minで25.5分間供給し、34.6gを導入した(第1工程)。
本実施例は図2に示す装置を用いて行なった。水が混入した市販電池グレードのジエチルカーボネート500g(水分濃度550ppmw)をフッ素樹脂製の第2槽6に入れ、ポンプ7で第2吸収塔5の塔頂部に供給し、循環させた。第2槽6は冷却器8を用いて20℃の恒温にした。次に、第2吸収塔5の塔底部に三フッ化ホウ素ガスを流量0.5L/minで17分間供給し、22.6gを導入した(第1工程)。
本比較例は図1に示す装置を用いて行なった。市販電池グレードのジエチルカーボネート (水分濃度9ppmw)をフッ素樹脂製の第1槽2及び第2槽6にそれぞれ3L仕込んだ後、ポンプ3及び7を用いて各吸収塔及び槽での循環運転を開始した。このとき、ポンプ3及びポンプ7の流量はともに1L/minとした。また、第1槽2及び第2槽6はそれぞれ冷却器4及び8を用いて20℃の恒温にした。
2 第1槽
3、7、11 ポンプ
4 第1冷却器
5 第2吸収塔
6 第2槽
8 第2冷却器
9 脱気塔
10 第3槽
12 エアーポンプ
13 凝縮器
21 正極
22 負極
23 多孔質セパレーター
24 正極缶
25 負極缶
26 ガスケット
27 スペーサー
28 スプリング
Claims (10)
- 有機溶媒に三フッ化ホウ素ガスを溶解させる第1工程と、
前記三フッ化ホウ素に対し等価又はそれ以下の化学量論量のフッ化物(MFn、Mは金属又はNH4、1≦n≦3)を前記有機溶媒に加え、四フッ化ホウ酸塩の溶液を生成させる第2工程と、
前記四フッ化ホウ酸塩の溶液を前記第1工程に循環させることにより、前記有機溶媒に代えて四フッ化ホウ酸塩の溶液に三フッ化ホウ素ガスを溶解させる第3工程を有することを特徴とする四フッ化ホウ酸塩の製造方法。 - 前記有機溶媒は、非水性有機溶媒又は非水性イオン液体の少なくとも何れか一方であることを特徴とする請求の範囲第1項に記載の四フッ化ホウ酸塩の製造方法。
- 前記有機溶媒として水分濃度が100ppmw以下のものを使用することを特徴とする請求の範囲第1項に記載の四フッ化ホウ酸塩の製造方法。
- 前記第1工程及び第3工程は吸収塔を用いて行うことを特徴とする請求の範囲第1項に記載の四フッ化ホウ酸塩の製造方法。
- 前記第1工程に於いて、前記三フッ化ホウ素ガスと前記有機溶媒との気液接触温度は-40~100℃であることを特徴とする請求の範囲第1項に記載の四フッ化ホウ酸塩の製造方法。
- 前記第3工程に於いて、前記三フッ化ホウ素ガスと前記四フッ化ホウ酸塩の溶液との気液接触温度は-40~100℃であることを特徴とする請求の範囲第1項に記載の四フッ化ホウ酸塩の製造方法。
- 前記第1工程における前記有機溶媒中の三フッ化ホウ素の濃度は15重量%以下であることを特徴とする請求の範囲第1項に記載の四フッ化ホウ酸塩の製造方法。
- 前記第3工程における前記四フッ化ホウ酸塩の溶液中の三フッ化ホウ素の濃度は15重量%以下であることを特徴とする請求の範囲第1項に記載の四フッ化ホウ酸塩の製造方法。
- 請求の範囲第1項に記載の四フッ化ホウ酸塩の製造方法により得られた四フッ化ホウ酸塩を含む電解液。
- 請求の範囲第9項に記載の電解液を備える蓄電素子。
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| CN200980159908.4A CN102803142B (zh) | 2009-06-19 | 2009-06-19 | 四氟硼酸盐的制造方法 |
| PCT/JP2009/061216 WO2010146710A1 (ja) | 2009-06-19 | 2009-06-19 | 四フッ化ホウ酸塩の製造方法 |
| KR1020127001546A KR101603376B1 (ko) | 2009-06-19 | 2009-06-19 | 4불화붕산염의 제조 방법 |
| SG2011094174A SG177287A1 (en) | 2009-06-19 | 2009-06-19 | Method for producing tetrafluoroborate |
| EP09846203.9A EP2444375A4 (en) | 2009-06-19 | 2009-06-19 | PROCESS FOR THE PRODUCTION OF TETRAFLUOROBORATE |
| CA2766014A CA2766014A1 (en) | 2009-06-19 | 2009-06-19 | Method for producing tetrafluoroborate |
| US13/377,795 US9376323B2 (en) | 2009-06-19 | 2009-06-19 | Method for producing tetrafluoroborate |
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| PCT/JP2009/061216 WO2010146710A1 (ja) | 2009-06-19 | 2009-06-19 | 四フッ化ホウ酸塩の製造方法 |
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| US (1) | US9376323B2 (ja) |
| EP (1) | EP2444375A4 (ja) |
| KR (1) | KR101603376B1 (ja) |
| CN (1) | CN102803142B (ja) |
| CA (1) | CA2766014A1 (ja) |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140162144A1 (en) * | 2011-08-03 | 2014-06-12 | Central Glass Company ,Limited | Method For Producing Lithium Tetrafluoroborate Solution |
| CN106800299A (zh) * | 2017-02-01 | 2017-06-06 | 洛阳和梦科技有限公司 | 高纯三氟化硼快速制备工艺及回收精制方法 |
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| JP5643439B2 (ja) | 2010-12-17 | 2014-12-17 | ダウ グローバル テクノロジーズ エルエルシー | 改良された光起電装置 |
| WO2012082608A2 (en) | 2010-12-17 | 2012-06-21 | Dow Global Technologies Llc | Improved photovoltaic device |
| EP3448562A4 (en) | 2016-04-25 | 2019-12-25 | Mayo Foundation for Medical Education and Research | PREPARATION FROM F-18-TETRAFLUORBORATE WITH HIGHLY SPECIFIC ACTIVITY |
| CN105970245B (zh) * | 2016-05-09 | 2018-02-13 | 上海应用技术学院 | 一种制备三氟化硼气体的装置 |
| CN109264736A (zh) * | 2018-11-14 | 2019-01-25 | 东营石大胜华新能源有限公司 | 一种四氟硼酸锂的制备方法 |
| CN111204776B (zh) * | 2020-02-26 | 2023-05-09 | 东莞东阳光科研发有限公司 | 一种四氟硼酸锂的提纯方法 |
| CN112960678A (zh) * | 2021-02-06 | 2021-06-15 | 昆明铂生金属材料加工有限公司 | 一种粗品四氟硼酸银脱出结晶水及提纯的方法 |
| CN114572993B (zh) * | 2022-05-07 | 2022-07-26 | 齐鲁工业大学 | 一种医药中间体合成中副产氟硼酸钾精制方法及装置 |
| CN115477308B (zh) * | 2022-08-28 | 2023-05-02 | 兰州理工大学 | 一种一步法常温制备四氟硼酸钠的方法 |
| CN115520875B (zh) * | 2022-10-21 | 2024-03-19 | 山东海科新源材料科技股份有限公司 | 一种四氟硼酸锂连续生产工艺 |
| CN116102029B (zh) * | 2023-02-28 | 2024-11-05 | 山东海科创新研究院有限公司 | 电池级四氟硼酸钠及其制备方法和所得产品 |
| CN119219008B (zh) * | 2024-11-29 | 2025-05-30 | 上海如鲲新材料股份有限公司 | 一种四氟硼酸盐的制备方法 |
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- 2009-06-19 CN CN200980159908.4A patent/CN102803142B/zh not_active Expired - Fee Related
- 2009-06-19 KR KR1020127001546A patent/KR101603376B1/ko not_active Expired - Fee Related
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- 2009-06-19 CA CA2766014A patent/CA2766014A1/en not_active Abandoned
- 2009-06-19 US US13/377,795 patent/US9376323B2/en not_active Expired - Fee Related
- 2009-06-19 SG SG2011094174A patent/SG177287A1/en unknown
- 2009-06-19 EP EP09846203.9A patent/EP2444375A4/en not_active Withdrawn
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| US9356319B2 (en) * | 2011-08-03 | 2016-05-31 | Central Glass Company, Limited | Method for producing lithium tetrafluoroborate solution |
| CN106800299A (zh) * | 2017-02-01 | 2017-06-06 | 洛阳和梦科技有限公司 | 高纯三氟化硼快速制备工艺及回收精制方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| SG177287A1 (en) | 2012-02-28 |
| CN102803142B (zh) | 2016-11-09 |
| EP2444375A1 (en) | 2012-04-25 |
| EP2444375A4 (en) | 2014-11-19 |
| KR20120039648A (ko) | 2012-04-25 |
| CA2766014A1 (en) | 2010-12-23 |
| KR101603376B1 (ko) | 2016-03-14 |
| CN102803142A (zh) | 2012-11-28 |
| US9376323B2 (en) | 2016-06-28 |
| US20120082608A1 (en) | 2012-04-05 |
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