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Lithium ion battery anode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low compaction density, easy crushing, etc., achieve simple preparation method, improve electrical conductivity and cycle stability, The effect of good cycle stability and rate capability

Inactive Publication Date: 2018-06-19
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the compaction density of this material is low, and it is easy to be crushed during the battery manufacturing process.

Method used

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  • Lithium ion battery anode material and preparation method thereof
  • Lithium ion battery anode material and preparation method thereof
  • Lithium ion battery anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A negative electrode material for a lithium ion battery. The negative electrode material includes the following raw materials by weight percentage: 40% of organic silicon resin, 40% of nano-silicon, and 20% of carbon source.

[0033] The preparation method of described lithium ion battery negative electrode material, comprises the steps:

[0034] S1. Mix the silicone resin, nano-silicon, and carbon source evenly to obtain solution A;

[0035] S2, add acidic solution to solution A, stir to obtain solution B;

[0036] S3. Add an alkaline solution to solution B, stir to obtain solution C, and evaporate solution C to dryness under oil bath conditions to obtain a Si / C / SiOC precursor;

[0037] S4, the Si / C / SiOC precursor is sintered.

Embodiment 2

[0039] A negative electrode material for a lithium ion battery. The negative electrode material includes the following raw materials by weight percentage: 85% of organic silicon resin, 10% of nano-silicon, and 5% of carbon source.

[0040] The preparation method of described lithium ion battery negative electrode material, comprises the steps:

[0041] S1. Mix the silicone resin, nano-silicon, and carbon source evenly to obtain solution A;

[0042] S2, add acidic solution to solution A, stir to obtain solution B;

[0043] S3. Add an alkaline solution to solution B, stir to obtain solution C, and evaporate solution C to dryness under oil bath conditions to obtain a Si / C / SiOC precursor;

[0044] S4, the Si / C / SiOC precursor is sintered.

Embodiment 3

[0046] A lithium ion battery negative electrode material, said negative electrode material comprises the following raw materials by weight: organic silicon resin 12.5g, nano-silicon 5g, carbon source 1g;

[0047] Wherein, the silicone resin is methyltriethoxysilane;

[0048] The nano-silicon is a silicon nanofiber;

[0049] The carbon source is carbon nanofibers.

[0050] The preparation method of described lithium ion battery negative electrode material, comprises the steps:

[0051] S1. Mix the silicone resin, nano-silicon, and carbon source evenly to obtain solution A;

[0052] S2, add acidic solution to solution A, obtain solution B after stirring for 1 h;

[0053] S3, adding an alkaline solution to solution B, stirring for 1 hour to obtain solution C, and evaporating solution C to dryness in an oil bath to obtain a Si / C / SiOC precursor;

[0054] S4, sintering the Si / C / SiOC precursor;

[0055] Wherein, in S2, add acidic solution to solution A to make the pH value of so...

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Abstract

The invention discloses a lithium ion battery anode material. The anode material is prepared from raw materials in percentage by weight as follows: 40%-85% of organosilicon resin, 10%-40% of nano silicon and 1%-20% of a carbon source. The invention also discloses a preparation method of the lithium ion battery anode material. The preparation method is simple and easy to control and realizes industrial operation, and the obtained anode material has good cycle stability and rate capability.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] With the development of electric vehicles and portable appliances, the demand for lithium-ion batteries with high energy density is also increasing. The theoretical specific capacity of traditional graphite anode materials is only 372mAh / g, which is difficult to meet market demand. The first gram capacity of silicon materials is 4200mAh / g, the lithium intercalation platform is higher, the earth's crust is abundant, and it is environmentally friendly, which has gradually attracted widespread attention of researchers. [0003] However, the volume expansion of silicon is as high as 300%. During the cycle, it will not only cause silicon to separate from the surrounding conductive carbon network to form "dead silicon", but also cause silicon to peel off from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/60H01M4/38H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/583H01M4/60H01M4/62H01M10/0525Y02E60/10
Inventor 王庆莉
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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