TW201133993A - Method for making electrode material of lithium-ion battery - Google Patents

Abstract

The present invention relates to a method for making an electrode material of lithium-ion batteries. In the method, a lithium source solution, titanium source particles and a carbon source compound are provided. For forming a sol, the lithium source solution and the titanium source particles are uniformly mixed according to a molar ratio of 4: 5 to 4.5: 5 of lithium element and titanium element. For forming a mixture sol, the carbon source compound and the sol are uniformly mixed. The mixture sol is spraying dried to form precursor particles. The precursor particles are heated, thereby forming the electrode material of lithium-ion battery.

Description

201133993, invention description: [Technical Field] [0001] The present invention relates to a method for preparing an H battery electrode material, and more particularly to a method for preparing a lithium titanate electrode material. [Prior Art 3 [0002] In recent years, spinel-type titanic acid clocks have attracted attention as electrode materials for new energy storage batteries because of the spinel type lithium titanate strontium during lithium ion intercalation-deintercalation. The crystal structure can maintain a high degree of stability. The clock ions are spinel before and after the blasting, and the lattice constant changes little, and the volume change is small, so lithium titanate is called "zero strain" electrode material. This can avoid the destruction of the structure due to the back and forth expansion of the electrode material in the charge and discharge cycle, thereby improving the cycle performance and the service life of the electrode, and reducing the attenuation of the specific capacity amplitude as the number of cycles increases, so that the lithium titanate Has excellent cycle performance. However, the lithium titanate material itself has a lower electrical conductivity, a lower rate performance, and a lower tap density than a material such as lithium manganate. Q [0003] In order to solve this problem, the commonly used methods include: preparing lithium nanotitanate particles to reduce the lithium ion diffusion path, increasing the surface area of the electrochemical reaction, and mixing more conductive materials between the lithium titanate powders. Carbon material; ion doping and the like. Xu Ning et al., in the publication of Chinese Patent Application Publication No. CN1 013781 No. 9 published on March 4, 2009, discloses a method for preparing a carbon-coated composite lithium titanate, which is specifically: a lithium salt and titanium dioxide are mixed in a volume ratio, a dispersing agent is added to the mixture and thoroughly mixed by ball milling, and then the ball-milled product is vacuum-dried to obtain a precursor; the precursor is prepared to be calcined at a temperature-fixed time,

099I0953J

Form nickname A010I Page 3 of 26 0992016934-0 201133993 Made of oleic acid; a carbon source material is coated on the surface of the prepared lithium titanate by dipping and evaporation; heat treatment is coated with carbon Lithium titanate as a source material, thereby obtaining a carbon-coated composite lithium titanate. The preparation method directly forms chemically coated carbon on the surface of the lithium titanate by pyrolysis reaction of the carbon coating material, and the coated carbon is more firmly and tightly contacted with the surface of the lithium titanate material, thereby greatly improving the electronic conductivity of the material. , effectively improve the material's rate of charge and discharge performance. [0004] However, the above method uses a ball milling method to mix a lithium salt and a titanium dioxide solid phase to form a precursor, and the precursor is only a uniform mixture of the two raw material powders, thereby resulting in a final product carbon-coated composite lithium titanate. The shape is irregular, the particle size distribution is uneven, the tap density is low, and the fluidity and workability are poor. SUMMARY OF THE INVENTION [0005] In view of this, it is necessary to provide a method for preparing a lithium battery electrode material, and a lithium titanate electrode having a regular morphology, uniform particle size distribution, and high tap density can be obtained by the preparation method. Spherical particles of material. [0006] A method for preparing a lithium battery electrode material, comprising: providing a lithium source solution and a titanium source particle, wherein the chain source solution and the titanium source particle have a molar ratio of the element to the titanium element of 4: 5 to 4 5: 5 ratio is uniformly mixed to obtain a sol; a carbon source compound is provided, and the sol is mixed with the carbon source compound to form a mixed sol; spray drying the mixed sol to obtain precursor particles; heat treatment The precursor particles thereby obtain a lithium battery electrode material. A method for preparing a lithium battery electrode material, comprising: providing a lithium source solution and a titanium source particle, the chain source solution and the titanium source particle according to the ri yuan 099109531 form number A0101 page 4 / total 26 pages 0 [0007 201133993 [0008] [0009] 〇 [0010] The molar ratio of the element to the titanium element is 4 - solution enthalpy; the ratio of sneezing 4. 5: 5 is uniformly mixed to make the above 4 "the above sol to obtain a plurality of precursor particles The hot granules are prepared to obtain a uniform solution of the plurality of secondary titanium granules, and the obtained plural secondary octanoic acid is mixed with the mixed carbon source compound solution to form a mixed liquid; and the composite 敎_electrode material is removed. Decomposing the carbon source compound to obtain a solution for preparing a solution: an electrode material, comprising: providing - lithium source =:::::= and ~ one.. bungee · * • main 4·5:5 The ratio is uniformly mixed to obtain a 敎Γη mist to dry the sol to obtain a plurality of precursor particles; and the above precursor granules, _ _ _ obtained secondary particles. Compared with the prior art, the method (4) (four) age obtained sol, and passed Spray drying to obtain the precursor _ teach, "(4) particles are spherical, with: small surface area, The particle size is small, the interesting distribution is relatively uniform, and the particle morphology is relatively regular, so that the finally obtained acid clock electrode material has high tap density, good fluidity and workability. Hereinafter, a method for preparing a nano battery electrode material according to the present invention will be described in detail. [0012] Referring to FIG. 1, FIG. 2 and FIG. 3, a first embodiment of the present invention provides a composite titanate chain electric material. The preparation method. Cai Chuncho Town Steps: Step - 'Provide (4) Solution and Qinyuan Granules to the Lithium Source Solution and the 099109531 Form No. 1010101 Page 5 / Total 26 Pages 0992016934-0 201133993 Titanium Source Particles by Bell Element and Chin The element molar ratio (L i : T i ) is 4: 5 to 4.5: 5 ratios are uniformly mixed to prepare a sol; [0013] [0016] [0018] [0018] Providing a carbon source compound, uniformly mixing the sol with the carbon source compound to form a mixed sol; Step 3 'spray drying the mixed sol to obtain precursor particles 1 〇〇; Step 4' heat treating the precursor particles 1 〇 〇' thereby obtaining a composite titanate clock 10. The following steps will be each specifically described electrode material. In step one, the lithium source solution based hydroxide or a lithium salt bell (

Li (〇H)) is formed by dissolving in a solvent. The lithium salt may be a carbonic acid clock, lithium sulfate, lithium nitrate or lithium vaporate, etc. and is not limited to the ones listed. The solvent may be water, ethanol or acetone or the like. The bell salt is preferably a water-soluble clock salt. The solvent is preferably water, and the water is preferably deionized water or distilled water to avoid introduction of other impurity elements.

The titanium source particles are insoluble in the solvent. The particle size range of the source particles is 20 nm to 1 μm, preferably 50 nm to 5 μm. The smaller the particle size of the U source U particles is. The more favorable it is to form a homogeneous sol. The titanium source particles may be water-insoluble titanium dioxide (Ti〇2) particles, hydrated titanium dioxide (Ti〇2 · χΗ2〇) particles or titanium oxyhydroxide (Ti0(0H)2) particles. If the titanium source particles are light base titanium oxide particles, the base titanium oxide particles may be prepared by providing a soluble titanium salt and ammonia water, and adding the ammonia water to the titanium salt, thereby making the ammonia water and the ammonia water The titanium salt reacts to form a precipitate of titanium oxyhydroxide; and the hydroxytitanium oxide is washed with water. The above method can be continuously obtained by the reaction while obtaining the particle size. 099109531 Form No. A0101 Page 6 of 26 0992016934-0 201133993 [0019] [0021]

[0022] Smaller titanium oxyhydroxide particles. The soluble titanium salt may be titanium tetrachloride (

TiClj or titanyl sulfate (TiOSO,), etc., the amount of the ammonia added is determined by precipitating all of the titanium in the soluble titanium salt, and may be appropriately excessive. The purpose of washing the titanium oxyhydroxide is Some residual ions, such as gas ions (cr), sulfate ions (s〇42_), etc., are washed away to prevent the residual ions from affecting the electrochemical properties of the finally obtained composite lithium titanate electrode material. In this embodiment, the source solution is an aqueous solution of lithium hydroxide of 0.5 mol/L to 3 mol/L, and the titanium source particles are obtained by a ratio of lithium to titanium in a molar ratio of 4:5. Titanium dioxide particles of rice particle size. In order to form a uniform sol, the above mixture of the lithium hydroxide solution and the titanium dioxide particles may be further stirred. The specific manner of the agitation is not limited, and may be mechanical stirring, magnetic stirring or ultrasonic dispersion. In the second step, the amount of the carbon source compound may be supplied in a ratio of a molar ratio of carbon element to titanium element (C:Ti) of from 0.1:1 to 2:1, which is preferably soluble in the carbon source compound. The reducing organic compound of the solvent in the above lithium source solution, which can be cleaved into carbon. The carbon source compound may be sucrose, glucose, phenolic resin, polyacrylic acid, polyacrylonitrile, polyethylene glycol or polyvinyl alcohol. In this embodiment, the carbon source compound is sucrose. The surface modification is carried out. The agent is an oil-in-water emulsifier which can surface-modify the titanium source particles contained in the above sol, and the titanium source particles and lithium are obtained from 099109531 Form No. A0101 Page 7 / 26 pages 0992016934-0 201133993 The salt or the hydroxide and the added carbon source compound achieve uniform mixing. Preferably, the surface modifier may be Tween 80 or Span 80 or the like. Further, in order to uniformly disperse the carbon source compound in the sol, the carbon source compound may be further dispersed by means of high-speed stirring or ultrasonic dispersion. The carbon source compound, the lithium salt or the lithium hydroxide and the titanium source particles in the mixed sol can be uniformly mixed by the liquid-solid mixing method of the above steps 1 and 2. [0024] In the third step, the mixed sol is spray-dried by a gas flow spray dryer, the air flow spray dryer has an atomizing device, and the atomizing device adopts a dual-flow nozzle, and the airflow spray dryer Dry by cocurrent drying. [0025] Specifically, the sol is input into the airflow spray dryer under a hot air stream by a peristaltic pump at a feed rate of 5 to 40 mL/min, and the feed rate is preferably 10 〜20ml/min; using the two-flow nozzle atomizing device to atomize the sol at a pressure of about 0. 05MPa~0. 2MPa, thereby forming a misty droplet, in this embodiment, in the atomization process The gas pressure is O.IMPa; the formed mist droplets are cocurrent with the hot air, and in the hot air, the mist droplets are instantaneously evaporated to almost all of the solvent, thereby forming a plurality of porous spherical precursors. Particles. During the whole process, the temperature of the hot air during the feeding is controlled at about 200 ° C ~ 400 ° C, and the temperature of the air after forming the spherical precursor particles is about 50 ° C ~ 150 ° C, and the spherical precursor particles are formed. Thereafter, the air in the spray dryer is vented by a first-stage vortex separation. In this embodiment, the temperature of the hot air at the time of the feed is 300 ° C, and the temperature of the air after forming the spherical precursor particles is 099109531. Form No. A0101 Page 8 of 26 0992016934-0 201133993 is 100 °c. [0026] The spray drying method can disperse the mixed sol into extremely fine mist droplets, so that the atomized mixed sol has a large specific surface area when the mist droplets and hot air are generated. After intense heat exchange, the solvent in the mist droplets is quickly removed in a few seconds to several tens of seconds to obtain a plurality of porous spherical or spheroidal precursor particles having a particle diameter of 1 to 10. The precursor particles have the advantages of relatively uniform particle size distribution, good fluidity, and can be added [0027] good workability and shape regularity. Referring to FIG. 2 , in the embodiment, each of the precursor particles 100 includes a plurality of cerium oxide particles, and the surface of each of the titanium dioxide particles 104 is evenly coated with lithium hydroxide particles 1 〇 2 and sucrose particles 106. There are pores between the plurality of titanium dioxide particles 1〇4, so that each of the precursor particles is a porous spherical structure. In the fourth step, the condition of the heat treatment is 惰性 099109531 under the gas atmosphere, and the particles 100 are driven for about 2 to 40 hours before the plurality of porous forms are heated at the temperature of 働〇1(){). The irradiation is carried out at a temperature of 7 〇 and the heat ring time is 16 hours. Please refer to 酊, during the heat treatment, the titanium dioxide particles U) 4 and the oxidized hydroxide in the plurality of porous precursor particles 10(10) The granules of the granules 1 〇 2 will react to form a complex number of nano-dipic acid via the granules 1 〇 8 ' at the same time, in which the sinter granules 106 are cleaved to form a carbon layer U0 coated on the surface of the nano-titanium acid granules, Thereby forming a top view of the titanate chain electrode (4) which is substantially coincident with the precursor particle 1 为, wherein the heat source is called the oxybenzene of the towel, and the carbon element is This is full of "Qi's carbon 兀 钦 颗粒 granules m surface, two middle brothers under the action of surface tension to adsorb one to 1G can suppress acid chain crystal grain 9th true / total 26 pages Form No. A0101 0992016934-0 201133993 ^大. In addition, due to the above method of drying up The regular porous spherical precursor particles 〖β 1υϋ' such that the precursor particles (10) have a plurality of heat transfer channels formed by the pores, such that the emulsified granules 104 and the oxyhydrogen (tetra) enthalpy can be at a lower heat treatment temperature Under a short period of time, it can take place for a long time to form lithium titanate particles 108 〇 [0028] [0029] 099109531 (4) The composite ship material (4) passes through the front (four) particles _ 1 and therefore has a spherical display frequency, and The fine-twist composite bell electrode has a uniform-reading diameter and a small (diameter, so that it has a relatively dense density and a good side.) The spherical composite of the titanate I-electrode has a large amount of titanic acid particles 1G8 inside. And the coating side (four) (four) the carbon layer UG of the surface of the particle U8. _ test, the composite titanic acid = material 10 has a tap density of L6W. At the same time, the second acid clock electrode material 1G is used as a negative electrode material for battery performance test, = Composite Titanic Acid (Four) Pole Material Pure Charge and Recharge Capacitance == Energy. Please refer to Figure 4 'The implementation of the failure to accept the composite acid = electrode material H) at the first charge and discharge performance at different rates, measured in "The ratio of the battery when the magnification is o.lc The amount can reach about i?N -» gram, at a rate of 1 (:, the specific capacity of the battery can reach about 160 mAh / gram; at a rate of 2e, the specific capacity of the battery can still reach 150 mAh/g. Please refer to Fig. 5. This example quantifies the cycle performance of the MQ of the Qinhe ship's electrode material at different rates. It can be seen that the current rates are Q. 1C, 1 (: and 2, respectively). Under the condition of (:, the specific capacity of the battery decreases less with the increase of the number of times. According to FIG. 6, the second embodiment of the present invention provides a lithium titanate electrode material half.

Form number A0101

$10/total 26 I 0992016934-0 201133993 [0033] [0033] [0035] [0035] 制备 Preparation method. The method comprises the following steps: Step - 'provide - lithium source solution and - titanium source particles, the lithium source solution and the titanium source particles are uniformly distributed in a molar ratio of lithium element to titanium element of 4:5 to 4:5:5 Mixing to prepare a sol; Step 2, spray drying the sol to obtain a plurality of precursor particles; and Step 3, heat treating the precursor particles to prepare a plurality of secondary lithium titanate particles. Step 4' provides a carbon source compound solution, uniformly dispersing the obtained plurality of secondary titanic acid particles in the carbon source compound solution to form a mixed solution; and step 5' removing the solvent in the mixed solution, and lysing the solution The carbon source compound is described to obtain the composite lithium titanate electrode material. The difference between this embodiment and the above first embodiment is that the first embodiment is obtained by first mixing the sol with a carbon source compound, then obtaining the precursor particles by spray drying, and finally performing heat treatment and the like. Obtaining a composite titanium acid electrolyte electrode material; in this embodiment, obtaining a plurality of secondary lithium titanate particles by first obtaining the precursor particles by a spray drying process and heat treating the plurality of precursor particles, and then The lithium secondary lithium titanate particles are mixed with the carbon source compound solution, and finally the composite acid electrode material is obtained by a process such as cracking the carbon source compound. The respective steps of this embodiment will be described in detail below. Please refer to FIG. 7 'Step 2 in this embodiment is basically the same as the method of spray drying in the third step in the above embodiment'. The difference is that the above first actual 099109531 form number Α 0101 page 11 / 26 pages 0992016934-0 [0036] 201133993 is a spray drying method of the sol sol formed by the sol and the carbon source compound, and the present embodiment is a direct spray drying of the sol, and the embodiment is obtained by the spray drying method. Each of the precursor particles 200 includes a plurality of titanium dioxide particles m, and the surface of each of the dioxide-deficient particles 2〇4 is uniformly coated with a plurality of hydroquinone chain particles 202. There is a void between the plurality of titanium dioxide particles 2〇4 in each of the front corpus callosum particles 200, thereby making it difficult for each precursor to be 2GG into a porous spherical structure. Further, the hair-drying parameters of the spray drying in this embodiment are substantially the same as those of the spray-drying parameters of the first embodiment. [0038] In the third step, the heat treatment is specifically carried out by heating the precursor particles 200 at 1 ° C ~ 1 ° ° C for 1 hour under an atmosphere of an inert gas. 20 hours. In this embodiment, the heat treatment heating temperature is 7 〇〇 <»c, and the heating time is 10 hours. During the heat treatment, the plurality of titanium dioxide particles 204 and the plurality of lithium hydroxide in each of the precursor particles 200 are The particles 202 are reacted to form a plurality of nano titanium titanate particles, thereby forming secondary lithium titanate particles. The morphology of the secondary lithium titanate particles is substantially the same as that of the precursor particles 200, that is, a porous spherical structure. Specifically, 'each secondary lithium titanate particle includes a plurality of nano titanium titanate particles, and a plurality of pores exist between the plurality of nanometer lithium titanate particles. The secondary lithium titanate particles can be directly used as an electrode active material. In the fourth step, the carbon source compound solution includes a solvent and a carbon source compound dissolved in the solvent, and the carbon source compound is preferably a water-soluble reducing organic compound, and the organic compound can be cleaved into carbon. The organic compound may be sucrose, glucose, phenolic resin, polyacrylic acid, polyacrylonitrile, polyethylene glycol or polyvinyl alcohol. In the present embodiment, 099109531 Form No. A0101, Page 12 of 26, 0992016934-0, 201133993, the carbon source compound is sucrose, wherein the ratio of the sucrose to the molar ratio of the carbon element to the titanium element is 0.1: 1~2: A ratio of 1 is provided. The solvent for dissolving the carbon source compound may be water, ethanol, propanol, acetone or N-methylpyrrolidone. In the present embodiment, the solvent is water. Since the each of the secondary lithium titanate particles includes a plurality of lithium titanate particles, and the plurality of lithium titanate particles include a plurality of pores, the carbon source compound solution may be coated in the secondary lithium titanate particles. Each of the lithium titanate particles. In addition, the concentration of the carbon source compound solution is not too large, and if the value is too large, the secondary lithium titanate particles are not easily dispersed uniformly in the carbon source compound solution, and waste of the carbon source compound is formed, and at the same time, The viscosity is too large, resulting in poor fluidity of the carbon source compound, and cannot sufficiently flow through the pores in each of the secondary lithium titanate particles, so that the surface of each of the secondary titanic acid particles cannot be sufficiently coated. The concentration of the carbon source compound solution is also not too small. Too small, the viscosity of the carbon source compound solution is too small, so that the carbon formed by the carbon source compound after being cleaved in the step 5 is not easily coated on the secondary titanic acid. The surface of the lithium titanate particles in the lithium particles. The concentration of the carbon source compound solution is preferably from 10% to 40%. In the present embodiment, the concentration of the carbon source compound solution is 15%. Further, in order to uniformly disperse the secondary lithium titanate particles in the carbon source compound solution, a surfactant may be further added, and the surfactant may change the surface of the secondary lithium titanate particles. The second lithium titanate particles are uniformly dispersed in the carbon source compound solution. The surfactant is preferably Tween 80, Siban 80 or the like. Further, the step may further include agitating the carbon source compound solution in which the lithium titanate particles are dispersed, thereby uniformly mixing the spherical precursor particles with the carbon source compound solution. The 099109531 Form No. A0101 Page 13 of 26 0992016934-0 201133993 The mixing method is not limited, it can be ultrasonic dispersion or high-speed mixing. [0040] In the fifth step, the mixed liquid may be first dried, and the specific manner of drying the mixed liquid may be drying, water bath or oil bath heating or the like. The heating temperature here needs to be less than 200 degrees. In the drying process, as the moisture evaporates, the carbon source compound adsorbs to the surface of each of the lithium titanate particles. [0041] The method of cracking the carbon source compound is: at 400 in an atmosphere of an inert gas. 〇_0. (The temperature of the secondary carbon source compound coated second lithium titanate particles is heat treated at a temperature of 4 to 20 hours, in the present embodiment, the heat treatment temperature is 7GGX: and the heat time is 6 hours. The carbon source compound distributed in the above secondary granules is decomposed and broken, forming a surface of the titanic acid particles coated in the each of the secondary titanic acid granules to form a composite titanate clock Electrode Material [0042] In the embodiment of the present invention, a sol of a uniform sentence is obtained by liquid-solid mixing, and the sol is obtained by spray drying. The phase __ county, by means of the solid-liquid mixing to form a sol, can make The titanium source particles, the lithium source solution and the carbon source compound reach a more uniform atomic order, so that in the finally obtained composite titanium electrode (4), the carbon layer can be uniformly coated on the titanic acid (four) particles. The surface improves the conductivity and electrochemical performance of the composite _ clock electrode = material; the composite lithium titanate electrode material obtained by the 対 drying method is porous, that is, has a fixed number of nanochannels , thereby increasing the composite titanium The effective reaction area of acid dihydrate and the reaction channel lithium ion electrode material have high reversible electrochemistry, and the weight of the grain; since the method obtained by spray drying, the precursor particles have a form number than the table 099109531 Α0101 Page U/26 pages, small, grain 201133993 [0043] 00 [0047] [0047] 00 [0047] The diameter is small, the particle size distribution is relatively uniform, and the particle morphology is relatively regular, thus making the final The obtained composite lithium titanate electrode material has high tap density, good fluidity and workability. In summary, the invention has indeed met the requirements of the invention patent, and the patent application is filed according to law. The above is only a preferred embodiment of the present invention, and the scope of the patent application is not limited thereto. Any equivalent modifications or changes made by those skilled in the art to the spirit of the present invention should be covered by the following application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a flow chart showing a method for preparing a lithium battery electrode material according to a first embodiment of the present invention. Fig. 2 is a view of the first embodiment of the present invention. 3 is a schematic structural view of a composite lithium titanate electrode material prepared according to a first embodiment of the present invention. FIG. 4 is a battery using a composite lithium titanate electrode material prepared by using the first embodiment of the present invention as a negative electrode. The specific capacity test curve of the first charge and discharge at different magnifications. [0049] FIG. 5 is a graph showing the cycle performance test of the battery using the composite lithium titanate electrode material prepared by the first embodiment of the present invention as a negative electrode at different magnifications. 6 is a flow chart of a method for preparing a lithium battery electrode material according to a second embodiment of the present invention. [0050] FIG. 7 is a schematic view showing the structure of a precursor particle prepared according to a second embodiment of the present invention. 099109531 Form No. 1010101 Page 15 of 26 pages 0992016934-0 201133993 [Description of main component symbols] [0051] Composite lithium titanate electrode material: 10 [0052] Precursor particles: 100,200 [0053] Lithium hydroxide particles: 102, 202 [0054] Titanium dioxide particles: 104,204 [0055] Sucrose particles: 106 [0056] Lithium titanate particles: 108 [0057] Carbon layer: 110 0992016934-0 099109531 Form number A0101 Page 16 of 26

Claims (1)

201133993 VII. Patent application scope: 1. A method for preparing a lithium battery electrode material, comprising: providing a lithium source solution and a titanium source particle, wherein the lithium source solution and the titanium source particle are in a molar ratio of the inner element to the titanium element a ratio of 4:5 to 4.5:5 is uniformly mixed to obtain a silicone; a carbon source compound is provided, and the sol and the carbon source compound are uniformly mixed to form a mixed sol; and the mixed sol is spray-dried to obtain Precursor particles; the precursor particles are heat treated to obtain a lithium battery electrode material. The method for producing a lithium battery electrode material according to claim 1, wherein the lithium source solution is formed by dissolving a lithium salt or lithium hydroxide in a solvent. 3. The method for producing a lithium battery electrode material according to claim 1, wherein the titanium source particles are titanium dioxide particles, hydrated titanium oxide particles or oxidized particles. 4. The method for preparing a lithium battery electrode material according to claim 3, wherein the titanium source particles have a particle diameter of 50 nm to 50 μm. The 1:1 to 2: 1 molar ratio of the carbon source compound to the sol according to the carbon element and the titanium element is 0. 1:1 to 2: 1 The ratio is mixed. 6. The method of producing a lithium battery electrode material according to claim 1, wherein a surface modifier is further added to the sol before the sol is mixed with the carbon source compound. 7. The method for preparing a lithium battery electrode material according to claim 1, wherein the step of spray drying further comprises: using a peristaltic pump 099109531 Form No. A0101 Page 17 / Total 26 Page 0992016934-0 201133993 The mixed sol is input to a spray dryer under the action of a stream of hot air at a temperature of 5 to 40 mL/mi η, the temperature of the hot air being 200 ° C to 400 ° C; in the spray drying The mixed sol is atomized at a pressure of 0.05 MPa to 0.2 MPa to form a mist-like droplet; and the mist-like droplets are cocurrently descended with the hot air to form the precursor particles. 8. The method for preparing a lithium battery electrode material according to claim 1, wherein the condition for heat-treating the precursor particles is: in an inert atmosphere, at 400 ° C to 1 000 ° C The precursor particles were heated at a temperature of 4 to 20 hours. A method for preparing a lithium battery electrode material, comprising: providing a lithium source solution and a titanium source particle, wherein the lithium source solution and the titanium source particles have a molar ratio of lithium element to titanium element of 4:5 to 4. 5: 5 ratio is uniformly mixed to obtain a sol; spray drying the sol to obtain a plurality of precursor particles; heat treating the precursor particles to prepare a plurality of secondary lithium titanate particles; providing a carbon source compound solution, The obtained plurality of secondary lithium titanate particles are uniformly dispersed in the carbon source compound solution to form a mixed solution; and the solvent in the mixed solution is removed, and the carbon source compound is cleaved to obtain a composite titanic acid electrode material. . 10. The method for preparing a lithium battery electrode material according to claim 9, wherein the heat treatment condition is specifically: the precursor particles are at 100 ° C to 1 in an inert gas atmosphere. Heat at 000 ° C for 1 hour to 20 hours. The method for preparing a lithium battery electrode material according to claim 9, wherein the concentration of the carbon source compound solution is 10% to 40°/〇. The method for preparing a lithium battery electrode material according to claim 9, wherein the obtained plurality of secondary lithium titanate particles are dispersed. The method of preparing the lithium battery electrode material according to claim 9 is disclosed in the following paragraph. A surface modifier is further added to the carbon source compound solution prior to the carbon source or compound solution. The method for preparing a lithium battery electrode material according to claim 9, wherein the method of cracking the carbon source compound is: in an inert gas atmosphere, at 400 ° C to 1 000 ° Heat treatment at a temperature of C for 4 to 20 hours. Ο 〇 099109531 Form number A0101 Page 19 of 26 0992016934-0