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Silicon carbon negative electrode material and preparation method thereof

A negative electrode material, silicon carbon technology, applied in the field of silicon carbon negative electrode materials and its preparation, can solve the problems of weak adhesion, affecting the electrochemical performance of silicon carbon materials, etc., and achieve the effect of easy filling

Inactive Publication Date: 2017-09-05
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the bonding force between the nanostructured silicon-based material and the conductive agent is weak, and it is easy to cause disconnection between the two during the volume expansion process, thereby affecting the electrochemical performance of the silicon-carbon material.

Method used

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  • Silicon carbon negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1, differs from comparative example in that this embodiment comprises the following steps:

[0041] Step 1, preparation of the precursor: the particle size is 100nm elemental silicon, methyl methacrylate, tetraethoxysilane (mass ratio is elemental silicon: methyl methacrylate: tetraethoxysilane=95:4: 1) After NMP is mixed (solid content is 10%) kneading, the revolution is 30 rpm, and the rotation is 300 rpm; kneading for 4 hours to obtain a homogeneously dispersed precursor of elemental silicon, methyl methacrylate, and tetraethoxysilane body;

[0042] Step 2, preparation of worm-like graphene-dominated conductive network structure: select microcrystalline graphite as raw material, then add concentrated sulfuric acid and potassium permanganate for oxidative intercalation, and obtain graphite oxide whose oxygen-containing functional group accounts for 15% of the total mass of graphite oxide. Then heat treatment to obtain worm-like graphene for use;

[0043] ...

Embodiment 2

[0046] Embodiment 2 is different from Embodiment 1 in that this embodiment includes the following steps:

[0047] Step 2, preparation of worm-like graphene-dominated conductive network structure: select microcrystalline graphite as raw material, then add concentrated sulfuric acid and potassium permanganate for oxidative intercalation to obtain graphite oxide whose oxygen-containing functional group accounts for 5% of the entire graphite oxide mass, Then heat treatment to obtain worm-like graphene for use;

[0048] The rest are the same as in Embodiment 1 and will not be repeated here.

Embodiment 3

[0049] Embodiment 3 is different from Embodiment 1 in that this embodiment includes the following steps:

[0050] Step 2, preparation of worm-like graphene-dominated conductive network structure: select microcrystalline graphite as raw material, then add concentrated sulfuric acid and potassium permanganate for oxidative intercalation, and obtain graphite oxide whose oxygen-containing functional group accounts for 20% of the mass of the entire graphite oxide. Then heat treatment to obtain worm-like graphene for use;

[0051] The rest are the same as in Embodiment 1 and will not be repeated here.

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Abstract

The invention belongs to the technical field of energy storage materials and in particular relates to a silicon carbon negative electrode material. The silicon carbon negative electrode material comprises a core structure and a shell structure, the core structure is a secondary particle structure and comprises a main conductive network with a porous structure and primary nanoparticles filled in the porous structure of the main conductive network; an auxiliary conductive network is distributed between the main conductive network and the primary nanoparticles; and the main conductive network and the primary nanoparticles are tightly connected together by virtue of the auxiliary conductive network, so that the silicon carbon negative electrode material has excellent electrochemical property.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, in particular to a silicon-carbon negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have brought revolutionary changes to the field of energy storage since their birth, and are widely used in various in portable electronic devices and electric vehicles. However, with the improvement of people's living standards, higher user experience puts forward higher requirements for lithium-ion batteries: lighter weight, longer service life, etc.; in order to solve the above problems, it is necessary to find new electrode materials with better performance. [0003] The current commercial lithium-ion battery anode material is mainly graphite, but its theoretical capacity is only 372mAh g -1 , can no longer meet the urgent needs of users; therefore, the development of anode materials with higher specific capacity is imminent. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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