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Silicon carbon cathode material and preparation method thereof, power battery and electric vehicle

A technology for negative electrode materials and power batteries, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of low cycle performance and rate performance of silicon carbon negative electrode materials, which need to be improved

Inactive Publication Date: 2019-04-05
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, directly adopting the above method, the cycle performance and rate capability of SiC anode materials are still not high.
[0003] Therefore, the related technologies of existing silicon-carbon anode materials still need to be improved.

Method used

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  • Silicon carbon cathode material and preparation method thereof, power battery and electric vehicle
  • Silicon carbon cathode material and preparation method thereof, power battery and electric vehicle
  • Silicon carbon cathode material and preparation method thereof, power battery and electric vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Mix a lithium source with a mass ratio of 0.78:1 and a silicon matrix to obtain a silicon-lithium mixture; heat the silicon-lithium mixture to 750°C for 1 hour, then cool to room temperature, and grind the obtained product to obtain a granular powder. Silicon-lithium alloy (particle size is 300nm); Silicon-lithium alloy is dispersed in isopropanol to obtain a silicon-lithium alloy dispersion with a mass concentration of 142g / L; graphene oxide is dispersed in isopropanol to obtain a mass concentration of 2g / L carbon source dispersion; mix the silicon-lithium alloy dispersion and the carbon source dispersion in a volume ratio of 1:1 to obtain a silicon-carbon mixed dispersion; filter the silicon-carbon mixed dispersion, and The filtered residue was freeze-dried to obtain a solid dispersion; the solid dispersion was heated to 500°C at a heating rate of 10°C / min and then kept for 1h; then heated to 800°C at a heating rate of 10°C / min and then kept for 4h; Then the temperatu...

Embodiment 2

[0086] Mix a lithium source with a mass ratio of 0.9:1 and a silicon matrix to obtain a silicon-lithium mixture; heat the silicon-lithium mixture to 850°C for 1.5 hours, then cool to room temperature, and grind the obtained product to obtain a granular powder The silicon-lithium alloy (particle size is 450nm); the silicon-lithium alloy is dispersed in isopropanol to obtain a silicon-lithium alloy dispersion with a mass concentration of 142g / L; the graphene oxide is dispersed in isopropanol to obtain a mass concentration of It is a 3g / L carbon source dispersion; mix the silicon-lithium alloy dispersion and the carbon source dispersion in a volume ratio of 1:1 to obtain a silicon-carbon mixed dispersion; filter the silicon-carbon mixed dispersion, and The filtered residue was freeze-dried to obtain a solid dispersion; the solid dispersion was heated to 500°C at a heating rate of 10°C / min and then kept for 1.5h; then heated to 800°C at a heating rate of 10°C / min and then kept warm...

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Abstract

The invention provides a silicon carbon cathode material and a preparation method thereof, a power battery and an electric vehicle. The preparation method of the silicon carbon cathode material includes the following steps: a silicon substrate is subjected to lithiation treatment to obtain a silicon lithium alloy; and a carbon functional layer is formed on an outer surface of at least part of thesilicon lithium alloy to obtain the silicon carbon cathode material. The method is simple, convenient, and easy to implement, and industrialized production can be easily realized. The silicon carbon cathode material prepared by the method has enough expansion space between the silicon substrate and the carbon functional layer even if when the silicon carbon cathode material is recharged again andexpands after the volume of the material is reduced by discharge. The expanded silicon substrate will not have a large expansive force on the carbon functional layer, so that the carbon functional layer formed on a surface of the silicon substrate is relatively complete, and more carbon functional layers will not be formed for better performance, thus the reversible capacity of silicon carbon cathode material is improved, reversible circularity is improved significantly, the service life is prolonged significantly, the multiplying power is significantly increased and high-rate charge and discharge cycles can be performed.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a silicon-carbon negative electrode material and a preparation method thereof, a power battery and an electric vehicle. Background technique [0002] At present, with the rapid update and iteration of global energy, the new energy industry is developing vigorously. Specific to the domestic automobile industry, the development of electric vehicles is an inevitable trend of environmental protection and industrial upgrading. In recent years, the world's major automobile-producing countries have launched countdowns to limit the production of fuel vehicles, bringing the development of new energy vehicles to the national strategic level, and are determined to carry out research and development of new energy technologies and large-scale industrialization layout. Therefore, new energy and electric vehicles are an important part of seizing the future green economic development. Silico...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 郑军华王亚州
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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