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Composite structure for lithium ion battery cathode and preparation method thereof

A lithium-ion battery and composite structure technology, applied in battery electrodes, nanotechnology for materials and surface science, structural parts, etc., can solve the problem that the charge-discharge capacity and cycle performance need to be improved, and it is difficult to meet the performance requirements of power batteries. Synthesis Problems such as complicated steps, to achieve the effect of increasing conductivity, ensuring stability, and alleviating the effect of volume expansion

Active Publication Date: 2019-07-26
HUAZHONG UNIV OF SCI & TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

Due to the low theoretical specific capacity and poor rate performance of commercial anode material graphite, it is difficult to meet the performance requirements of power batteries. Therefore, it is imminent to develop new high-performance, high-stability and safe lithium-ion battery anodes.
[0004] In order to alleviate the volume expansion effect of the antimony-based negative electrode, the conventional method is to control its morphology, such as designing the core-shell structure, etc., but the synthesis steps are often complicated, and the charge-discharge capacity and cycle performance still need to be improved.

Method used

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  • Composite structure for lithium ion battery cathode and preparation method thereof
  • Composite structure for lithium ion battery cathode and preparation method thereof
  • Composite structure for lithium ion battery cathode and preparation method thereof

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preparation example Construction

[0031] see figure 1 , the present invention also provides a kind of preparation method for the composite structure of negative electrode of lithium ion battery, and this preparation method comprises the following steps:

[0032] Step 1, dissolving and dispersing antimony salt, nitrogen source precursor, and sodium chloride template, stirring and freeze-drying the obtained solution to obtain a powder product.

[0033] Specifically, the natural polymer carbon source precursor, the nitrogen source precursor and sodium chloride are dissolved in a certain volume of water to form a natural polymer carbon source precursor with a concentration of 0.01mol / L to 0.03mol / L. It is a mixed solution of nitrogen source precursor of 0.005mol / L~0.01mol / L and sodium chloride with a concentration of 0.02g / mL~0.1g / mL; The ethanol solution of antimony salt is slowly added dropwise to the above mixed solution, and then magnetically stirred at 60°C-80°C for 10h-20h, and freeze-dried when the solutio...

Embodiment 1

[0040] The preparation method for the composite structure of the lithium-ion battery negative electrode provided in Example 1 of the present invention mainly includes the following steps:

[0041] S1, take the natural polymer carbon source precursor, nitrogen source precursor and sodium chloride and dissolve them in 300ml of water to make the natural polymer carbon source precursor with a concentration of 0.01mol / L and the nitrogen source precursor with a concentration of 0.01mol / L, the concentration of sodium chloride is a mixed solution of 0.02g / mL; then, 100ml of ethanol solution of antimony salt with a concentration of 0.01mol / L is slowly added dropwise to the above mixed solution, and the resulting solution is heated at 60°C Under magnetic stirring for 12 h to obtain a milky white homogeneous solution.

[0042] S2. Warm up the solution obtained in step S1 to 80°C and evaporate it with open stirring until the solution is reduced to one-eighth of the original solution (i.e...

Embodiment 2

[0045] The preparation method for the composite structure of the lithium-ion battery negative electrode provided by Example 2 of the present invention mainly includes the following steps:

[0046] S1, take the natural polymer carbon source precursor, nitrogen source precursor and sodium chloride and dissolve them in 300ml of water to make the natural polymer carbon source precursor with a concentration of 0.02mol / L and the nitrogen source precursor with a concentration of 0.008mol / L, the concentration of sodium chloride is a mixed solution of 0.08g / mL; then, 100ml of ethanol solution of antimony salt with a concentration of 0.1mol / L is slowly added dropwise to the above mixed solution, and the resulting solution is heated at 70°C Under magnetic stirring for 10 h to obtain a milky white homogeneous solution.

[0047] S2, warm up the solution obtained in step S1 to 80°C and open to stir and evaporate until the solution is 1 / 4 of the original solution (i.e. 160ml), then transfer...

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Abstract

The invention belongs to lithium ion battery technical field, and discloses a composite structure for lithium ion battery cathode and a preparation method thereof. The composite structure comprises nano particles and carbon nano sheets, wherein the nano particles are dispersed on the carbon nano sheets, and a core-shell structure is provided. The carbon nano sheets are three-dimensional porous nitrogen-doped carbon nano sheets. The nano particles comprise antimony oxide shells and antimony cores disposed in the antimony oxide shells, wherein the antimony cores and the antimony oxide shells arebuffer layers mutually for each other. The antimony cores and the antimony oxide shell layers are buffer layers, and are cooperated with lithium storage to relieve volume expansion effect. The three-dimensional porous nitrogen-doped carbon nano sheets used as a substrate for loading the nano particles and a conductive framework, so that the stability and the rate capability of the composite structure are further ensured, more lithium storage active sites are provided by nitrogen doping, the conductivity of the composite structure is increased, and the long-cycle stability of the material is guaranteed.

Description

technical field [0001] The invention belongs to the technical field related to lithium ion batteries, and more specifically relates to a composite structure for negative electrodes of lithium ion batteries and a preparation method thereof. Background technique [0002] At present, with the rapid development of society, human beings' demand for energy is expanding day by day. At the same time, the gradual consumption of fossil energy such as coal, oil, and natural gas and the urgent need to solve the problem of environmental pollution, the development of green and pollution-free energy has become the priority of all countries. Focus on key points. Lithium-ion batteries have been applied in many fields due to their high energy density, small self-discharge, long cycle life and environmental friendliness. [0003] In recent years, the use of lithium-ion batteries in electric vehicles and plug-in hybrid vehicles has further promoted the research and development of new high-perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/366H01M4/38H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 李箐陈仙王谭源
Owner HUAZHONG UNIV OF SCI & TECH
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