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CN111900374B - High energy density quick charging type lithium ion power battery - Google Patents

High energy density quick charging type lithium ion power battery Download PDF

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Publication number
CN111900374B
CN111900374B CN202010784629.5A CN202010784629A CN111900374B CN 111900374 B CN111900374 B CN 111900374B CN 202010784629 A CN202010784629 A CN 202010784629A CN 111900374 B CN111900374 B CN 111900374B
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carbon
nanotube array
positive electrode
carbon nanotube
carbon nanotubes
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CN111900374A (en
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钟馨稼
钟旭航
张旻澍
李晓丹
路密
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Dongfang Xingshi Energy Storage Battery Co ltd
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Fujian Dongfang Xingshi New Energy Co ltd
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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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/386—Silicon or alloys based on silicon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/028—Positive electrodes
    • 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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Abstract

The invention provides a high energy density fast charging lithium ion power battery, comprising: the positive electrode is of a sheet structure with the thickness of 80-550 microns, a plurality of carbon nano tubes which are closely arranged are arranged along the surface vertical to the sheet structure, a carbon connecting layer for connecting the carbon nano tubes is arranged between the carbon nano tubes to form a carbon nano tube array framework, and nano LiFe(1‑x)YxPO4Filling the carbon nanotube array skeleton between adjacent carbon nanotubes and partially covering the surface of the carbon nanotube array skeleton, wherein the value of x is 0.01-0.05; the cathode is of a 50-500 micrometer sheet-shaped structure, a plurality of carbon nano tubes which are closely arranged are arranged along the surface vertical to the sheet-shaped structure, a carbon connecting layer for connecting the carbon nano tubes is arranged among the carbon nano tubes to form a carbon nano tube array framework, and nano silicon materials are connected among the adjacent carbon nano tubes in the carbon nano tube array framework in a dispersing way; a separator provided between the positive electrode and the negative electrode; an electrolyte filled between the positive electrode and the negative electrode; and a housing for encapsulating the material.

Description

High energy density quick charging type lithium ion power battery
Technical Field
The invention relates to a high-energy-density fast-charging lithium ion power battery.
Background
If want to really realize experiencing with traditional gasoline motor car and being close, shorten the topic that charging time is irretrievable.
The intrinsic conductivity of the lithium iron phosphate is lower and is only one percent of that of a ternary material, so that the lithium iron phosphate is not suitable for quick charge, and the requirement of quick charge can be met only by optimizing the conductivity of the lithium iron phosphate material.
Disclosure of Invention
The invention provides a high-energy-density fast-charging lithium ion power battery, which can effectively solve the problems.
The invention is realized by the following steps:
a high energy density fast-charging lithium ion power cell comprising:
the positive electrode is of a sheet structure with the thickness of 80-550 microns, a plurality of carbon nano tubes which are closely arranged are arranged on the surface perpendicular to the sheet structure, a carbon connecting layer for connecting the carbon nano tubes is arranged between the carbon nano tubes to form a carbon nano tube array framework, and nano LiFe(1-x)YxPO4Filling the space between adjacent carbon nanotubes in the carbon nanotube array skeleton and partially covering the surface of the carbon nanotube array skeleton;
the cathode is of a 50-500 micrometer sheet-shaped structure, a plurality of tightly arranged carbon nanotubes are arranged along the surface vertical to the sheet-shaped structure, a carbon connecting layer for connecting the carbon nanotubes is arranged among the carbon nanotubes to form a carbon nanotube array framework, and a nano silicon material is connected among the adjacent carbon nanotubes in the carbon nanotube array framework in a dispersing way;
a separator provided between the positive electrode and the negative electrode;
an electrolyte filled between the positive electrode and the negative electrode; and
and the shell is used for packaging the materials.
The invention has the beneficial effects that: the invention relates to a method for preparing LiFe(1-x)YxPO4Deposited inside and on the surface of the carbon nanotube array skeleton to increase the contact area and contact force between the active material and the carbon nanotube array skeleton to form superconductive electron net, increase ion passage and reduce active material consumptionThe contact resistance between the material and the carbon nanotube array skeleton (as a current collector). In addition, the carbon nanotube array framework provided by the invention has the advantages that the adjacent carbon nanotubes are fixed on the framework through the carbon connecting layer, so that the nano silicon material is dispersed in the pore channels formed between the adjacent carbon nanotubes in the carbon nanotube array framework, the expansion of the silicon material is inhibited, the expansion rate of the silicon material is reduced, and the problems of pulverization of silicon and poor cycle life are fundamentally solved. In addition, the carbon nanotube has good conductivity along the radial direction, so that the overall conductivity of the negative electrode material can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a high energy density fast-charging lithium ion power battery provided in an embodiment of the present invention.
Fig. 2 is a flowchart of a method for preparing a positive electrode in a high-energy-density fast-charging lithium ion power battery according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a reaction furnace used in a preparation method of a high-energy-density fast-charging lithium ion power battery provided by an embodiment of the invention.
Fig. 4 is a schematic structural diagram of a reaction kettle used in a method for preparing a positive electrode in a high-energy-density fast-charging lithium ion power battery provided by an embodiment of the invention.
Fig. 5 is a flowchart of a method for preparing a positive electrode of a high energy density fast-charging lithium ion power battery according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1, an embodiment of the invention provides a high energy density fast-charging lithium ion power battery, including:
the positive electrode 30 is of a lamellar structure with the thickness of 80-550 microns, a plurality of carbon nano tubes which are closely arranged are arranged on the surface perpendicular to the lamellar structure, carbon connecting layers for connecting the carbon nano tubes are arranged among the carbon nano tubes to form a carbon nano tube array framework, and nano LiFe(1-x)YxPO4Filling the carbon nanotube array skeleton between adjacent carbon nanotubes and partially covering the surface of the carbon nanotube array skeleton, wherein the value of x is 0.01-0.05;
the cathode 31 is of a 50-500 micrometer sheet-shaped structure, a plurality of tightly arranged carbon nanotubes are arranged along the surface perpendicular to the sheet-shaped structure, a carbon connecting layer for connecting the carbon nanotubes is arranged between the carbon nanotubes to form a carbon nanotube array framework, and a nano silicon material is dispersedly connected between the adjacent carbon nanotubes in the carbon nanotube array framework;
a separator 32 provided between the positive electrode 30 and the negative electrode 31;
an electrolyte filled between the positive electrode 30 and the negative electrode 31; and
and a housing 33 for enclosing the above materials.
As a further improvement, LiFe in the positive electrode 30(1-x)YxPO4The mass ratio of the carbon nano tube to the carbon nano tube is 1: 1.5-1: 2.
As a further improvement, LiFe in the front surface of the positive electrode 30(1-x)YxPO4The thickness of (A) is 30 to 100 μm.
As a further improvement, the ratio of silicon to carbon in the negative electrode 31 is 1: 3-1: 5.
As a further improvement, the thickness of the carbon connection layer is 10 nm to 20 nm.
Referring to fig. 1, the method for preparing the positive electrode includes the following steps:
s1, providing a carbon nanotube array skeleton, wherein the carbon nanotube array skeleton comprises a plurality of carbon nanotubes closely arranged along the same direction and a carbon connection layer connected between adjacent carbon nanotubes;
s2, mixing the components in a molar mass ratio of 1.05-1.2: (1-x): 0.5 x: 1.1-1.2: 2-3 adding LiOH. H2O、FeC2O4·2H2O、Y2(C2O4)3·4(H2O)、NH4H2PO4And C6H8O7·H2Dissolving O in water to form a reaction solution, wherein the concentration of Fe in the reaction solution is 0.2-0.4 mol/L;
s3, immersing the carbon nano tube array framework in the reaction solution, leading the reaction solution to flow through the carbon nano tube array framework, and controlling the reaction temperature of 145-155 ℃ to react for 1-12h so as to lead the LiFe(1-x)YxPO4Deposited inside and on the surface of the carbon nanotube array skeleton。
In step S1, the method for preparing the carbon nanotube array skeleton includes the following steps:
s11, fixing the carbon nanotube array on the porous substrate;
and S12, under the condition of protecting atmosphere, enabling ethylene gas to flow from the top end of the carbon nanotube array to the porous substrate at the bottom end, controlling the reaction temperature to be 800-850 ℃ and the reaction time to be 20-60 minutes, and forming the carbon nanotube array skeleton.
In step S11, the method for preparing the carbon nanotube array may adopt a chemical vapor deposition method.
Specifically, the method comprises the following steps: (a) providing a flat silicon substrate; (b) uniformly forming an iron (Fe) catalyst layer on the surface of the substrate; (c) annealing the substrate with the catalyst layer in the air at 700-900 ℃ for about 30-90 minutes; (d) placing the treated substrate in a low-pressure reaction furnace, heating the substrate to 700-710 ℃ under the atmosphere pressure of about 0.2torr in a nitrogen environment, and then introducing acetylene to react for about 20-30 minutes to grow to obtain a carbon nano tube array; (e) and scraping the carbon nanotube array from the substrate by adopting a blade or other tools to obtain the carbon nanotube array. The carbon nanotube array is a pure carbon nanotube array formed by a plurality of carbon nanotubes which are parallel to each other and grow vertical to the substrate. The height of the carbon nanotubes is 50-500 micrometers, and the distance between the carbon nanotubes is 10-500 nanometers.
And after the carbon nanotube array is scraped from the substrate, the carbon nanotube array is laid on the cordierite honeycomb substrate. The cordierite honeycomb substrate has a uniformly distributed porous structure, and can allow airflow to slowly and uniformly pass through.
Referring to fig. 2, in step S12, the cordierite honeycomb substrate 12 with the carbon nanotube array 13 laid thereon may be placed on a bottom-draft reaction furnace for reaction. Specifically, the reaction furnace includes: an upper cover 10 and a reaction chamber 11 in threaded fit with the upper cover 10; the bottom of the reaction chamber 11 is provided with a bottom suction type exhaust funnel 14, and the exhaust funnel 14 is provided with a vacuum pump 15. The upper cover 10 comprises a first air inlet 101, a second air inlet 102 and a third air inlet 103 which is uniformly distributed on the lower surface and has a diameter of 1-5 mm, the first air inlet 101 is communicated with the third air inlet 103, and the second air inlet 102 is also communicated with the third air inlet 103. The first gas inlet 101 is used for introducing protective atmosphere, and the second gas inlet 102 is used for introducing ethylene gas. The side wall of the reaction cavity 11 is provided with a plurality of additional resistance wires 111, and the bottom of the reaction cavity 11 is provided with a plurality of exhaust holes 112 which are uniformly distributed. The bottom of the exhaust funnel 14 is provided with an exhaust port 141, and a pressure sensor 142 is arranged near the exhaust port 141, so that the barometer 142 can be prevented from being damaged by high temperature by arranging the barometer 142 in the exhaust port 141 instead of the reaction chamber 11. The side wall of the exhaust funnel 14 is further provided with a cooling pipeline 143, and the cooling pipeline 143 is used for gas inside the cooler. The bottom of the reaction chamber 11 is tightly matched with the exhaust funnel 14 in a threaded manner, and an annular sealing ring 113 is further arranged at a joint between the reaction chamber 11 and the exhaust funnel 14.
Heating to 800-850 ℃ under the nitrogen environment at the atmospheric pressure of about 0.5-1.0 torr, then closing the nitrogen and introducing ethylene to react for about 20-60 minutes (in the reaction process, the atmospheric pressure is kept at about 0.5-1.0 torr under the control of the flow of the ethylene gas and a vacuum pump), so that the carbon connecting layer is connected between the adjacent carbon nano tubes to form a framework between the fixed carbon nano tubes. It is understood that a thicker carbon connection layer may be formed on the surface of each carbon nanotube when the reaction time is longer, resulting in greater skeletal strength, but the thicker carbon connection layer is more likely to block the gap between the carbon nanotubes. When the reaction time is short, the connection strength between the carbon nanotubes is low, and the carbon nanotubes are easily expanded by the silicon and damaged. Therefore, the reaction time is preferably about 30 minutes. The carbon connection layer has a thickness of 10 to 20 nanometers. In addition, the thickness of the carbon tie layer can also be controlled by controlling the concentration of ethylene gas.
In step S2, it is preferable that the molar mass ratio of 1.1: 0.98: 0.02: 1.1: 2.5 addition of LiOH. H2O、FeC2O4·2H2O、Y2(C2O4)3·4(H2O)、NH4H2PO4And C6H8O7·H2O, and the concentration of Fe in the reaction solution is about 0.3 mol/L.
Referring to fig. 3, in step S3, a reaction apparatus is further provided. The reaction apparatus comprises:
a top cover (20);
the reaction kettle (21) is in threaded fit with the top cover (20) and comprises a pressurizing air inlet (214) arranged at the top, a heating wire (211) arranged at the bottom in a surrounding manner, and an ultrasonic generator (215) arranged on the side wall, and a plurality of through holes (212) are uniformly distributed at the bottom of the reaction kettle (21);
and the bottom suction type liquid discharge cylinder (22) is arranged at the bottom of the reaction kettle (21) and is communicated with the through hole (212).
The bottom suction type liquid discharge cylinder (22) further comprises a cooling water path (222). The bottom of reation kettle (21) with drain cylinder (22) closely cooperates through the screw thread mode, just reation kettle (21) with the junction between drain cylinder (22) further is provided with annular sealing washer 213.
In step S3, the method further includes:
s31, fixing the carbon nanotube array framework at the bottom of the reaction kettle (21), and enabling the carbon nanotube array framework to cover the through holes (212), wherein the diameter of the through holes (212) is 1-10 microns, and the through holes are uniformly distributed at intervals, so that the flow rate of the reaction solution can be controlled;
s32, pouring the reaction solution into the bottom of a reaction kettle (21) and immersing the carbon nanotube array skeleton, and then covering the top cover (20);
s33, pressurizing through the pressurizing air inlet (214), and controlling the ultrasonic generator (215) to work, wherein the pressure is 0.2-0.5 MPa, and the power of the ultrasonic generator (215) can be 100-500W;
s34, opening the heating wire (211) to carry out heating reaction, wherein the heating temperature is 145-155 ℃.
As a further improvement, after step S34, the method further includes:
and S35, when the reaction solution can not flow out, finishing the reaction. It is understood that when the reaction solution cannot flow out, LiFe is illustrated(1-x)YxPO4And the reaction solution is deposited inside and on the surface of the carbon nano tube array framework, so that pores in the carbon nano tube array framework are blocked, and the reaction solution cannot flow through the carbon nano tube array framework.
As a further improvement, in step S33, the method further includes:
and S331, opening the cooling water path (222) to reduce the temperature, and preventing the reaction solution from reacting in the bottom-suction type liquid discharge cylinder (22).
After step S3, the method further includes:
s4, soaking the positive electrode in electrolyte, pressurizing and infiltrating the electrolyte to infiltrate the electrolyte between the carbon nano tubes in the positive electrode, taking out the positive electrode, standing the positive electrode for more than 5 hours at normal temperature, heating the positive electrode to 50-60 ℃, and preserving the heat for 1-2 hours to further rapidly activate the positive electrode.
In step S4, the pressure of the pressure impregnation is 0.5 to 1MPa, and the impregnation is performed for 1 to 2 hours.
Referring to fig. 4, an embodiment of the present invention provides a method for preparing a silicon-carbon negative electrode material, including the sub-step of:
s1, providing a carbon nanotube array skeleton, wherein the carbon nanotube array skeleton comprises a plurality of carbon nanotubes closely arranged along the same direction and a carbon connection layer connected between adjacent carbon nanotubes;
s5, dispersing the nano silicon material in a volatile organic solvent to form a suspension;
s6, taking the carbon nanotube array skeleton as a bottom layer, pouring the suspension into the bottom layer, and performing suction filtration;
and S7, carrying out vacuum-pumping rapid freeze-drying on the carbon nanotube array skeleton containing the suspension to form the silicon-carbon negative electrode material, wherein the nano-silicon material is dispersed among adjacent carbon nanotubes in the carbon nanotube array skeleton.
In step S5, the solvent is acetone. The acetone and the carbon nano tubes can realize good wetting performance, so that the suspension can better enter gaps among the carbon nano tubes. The particle size of the nano silicon material is 10-50 nanometers. It is understood that when the particle size of the nano-silicon material is too large, it is not easily introduced into the gaps between the carbon nanotubes.
In step S6, the suspension may be made to flow through the carbon nanotube framework by suction filtration, and the nano-silicon material may be adsorbed between adjacent carbon nanotubes in the carbon nanotube array framework.
In step S7, the step of rapidly lyophilizing the carbon nanotube array matrix including the suspension includes:
and S71, rapidly cooling the carbon nanotube array skeleton containing the suspension to-30 ℃, and preserving heat for 1-5 hours until the organic solvent is completely volatilized. Through the treatment, the bonding strength between the nano silicon material and the carbon nano tube and between the nano silicon material and the carbon connecting layer can be improved, and the carbon connecting layer and the carbon nano tube can be well connected.
And after the preparation of the anode and the cathode is finished, packaging the anode, the cathode and the diaphragm, and filling electrolyte to obtain the soft package lithium ion battery. Wherein the lead of the positive electrode or the negative electrode can be embedded in the back surface in advance.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. A high energy density fast-charging lithium ion power battery, comprising:
a positive electrode having multiple carbon nanotubes closely arranged, and a carbon connection layer between the carbon nanotubes for connecting the carbon nanotubes to form a carbon nanotube array skeleton, wherein the carbon connection layer has a thickness of 10-20 nm and is made of nano-LiFe(1-x)YxPO4Filling the carbon nanotube array skeleton between adjacent carbon nanotubes and partially covering the surface of the carbon nanotube array skeleton, wherein x is 0.01-0.05, and the carbon nanotube array skeleton and the nano LiFe filled between adjacent carbon nanotubes in the carbon nanotube array skeleton and partially covering the surface of the carbon nanotube array skeleton(1-x)YxPO4Forming a lamellar structure with the thickness of 80-550 microns, wherein the carbon nanotube is arranged along the direction vertical to the surface of the lamellar structure;
the cathode is provided with a plurality of carbon nanotubes which are closely arranged, a carbon connecting layer for connecting the carbon nanotubes is arranged among the carbon nanotubes to form a carbon nanotube array framework, the thickness of the carbon connecting layer is 10 to 20 nanometers, nano silicon materials are dispersedly connected among the adjacent carbon nanotubes in the carbon nanotube array framework, the carbon nanotube array framework and the nano silicon materials dispersedly connected among the adjacent carbon nanotubes in the carbon nanotube array framework form a lamellar structure with the thickness of 50 to 500 micrometers, and the carbon nanotubes are arranged along the direction vertical to the surface of the lamellar structure;
a separator provided between the positive electrode and the negative electrode;
an electrolyte filled between the positive electrode and the negative electrode; and
and the shell is used for packaging the materials.
2. The high energy density, fast-charging lithium ion power cell of claim 1 wherein LiFe in the positive electrode(1-x)YxPO4The mass ratio of the carbon nano tube to the carbon nano tube is 1: 1.5-1: 2.
3. The high energy density fast-charging lithium ion power battery according to claim 1, wherein the ratio of silicon to carbon in the negative electrode is 1:3 to 1: 5.
4. The high energy density, fast-charging lithium ion power cell of claim 1 wherein the preparation of the positive electrode comprises the steps of:
s1, providing a carbon nanotube array skeleton, wherein the carbon nanotube array skeleton comprises a plurality of carbon nanotubes closely arranged along the same direction and a carbon connection layer connected between adjacent carbon nanotubes;
s2, mixing the components in a molar mass ratio of 1.05-1.2: (1-x): 0.5 x: 1.1-1.2: 2-3 adding LiOH. H2O、FeC2O4·2H2O、Y2(C2O4)3·4(H2O)、NH4H2PO4And C6H8O7·H2Dissolving O in water to form a reaction solution, wherein the concentration of Fe in the reaction solution is 0.2-0.4 mol/L;
s3, immersing the carbon nano tube array framework in the reaction solution, leading the reaction solution to flow through the carbon nano tube array framework, and controlling the reaction temperature of 145-155 ℃ to react for 1-12h so as to lead the LiFe(1-x)YxPO4Deposited inside and on the surface of the carbon nanotube array skeleton.
5. The high energy density, fast-charging lithium ion power cell of claim 4, further comprising after step S3:
s4, soaking the positive electrode in electrolyte, pressurizing and infiltrating the electrolyte to infiltrate the electrolyte between the carbon nano tubes in the positive electrode, taking out the positive electrode, standing the positive electrode for more than 5 hours at normal temperature, heating the positive electrode to 50-60 ℃, and preserving the heat for 1-2 hours to further rapidly activate the positive electrode.
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CN113851636B (en) * 2021-09-23 2025-11-04 浙江载驰科技股份有限公司 A nitrogen-doped silicon-carbon composite anode material and its preparation method

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