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Silicon-carbon negative electrode material and preparation method therefor

A negative electrode material, silicon carbon technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems affecting the electrochemical performance of silicon carbon materials, disconnection, weak adhesion, etc., to reduce energy consumption and production costs , The effect of increasing the solid content

Active Publication Date: 2017-08-18
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 therefor

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0037] Embodiment 1, differs from comparative example in that this embodiment comprises the following steps:

[0038] Step 1, kneading: elemental silicon, methyl methacrylate, tetraethoxysilane (mass ratio is: elemental silicon: methyl methacrylate: tetraethoxysilane=90:4:1) with a particle diameter of 100nm ), NMP (solid content is 1%) after mixing kneading, revolution is 60 revs / min, and rotation is 500 revs / min; Kneading 2h obtains mixture 1; Conductive carbon black, polyvinylpyrrolidone (mass ratio is conductive carbon black: Polyvinylpyrrolidone=4.9:0.1) and NMP (0.5% solid content) are mixed and then kneaded, the revolution is 60 rpm, and the rotation is 500 rpm; kneading for 2 hours to obtain mixture 2; mix mixture 1, mixture 2 (mass ratio It is elemental silicon: conductive carbon black=90:4.9) mixed together, continue kneading, revolution is 20 turns / min, and rotation is 300 turns / min; After kneading 2h, obtain polymer monomer, nano-silicon-based material, conductive ...

Embodiment 2

[0043] Embodiment 2 is different from Embodiment 1 in that this embodiment includes the following steps:

[0044] Step 1, kneading: elemental silicon, methyl methacrylate, and tetraethoxysilane (mass ratio: elemental silicon: methyl methacrylate: tetraethoxysilane=90:4:1) with a particle size of 100 nm ), NMP mixed (solid content is 5%) kneading, revolution is 20 rev / min, and rotation is 300 rev / min; Kneading 2h obtains mixture 1; Conductive carbon black, polyvinylpyrrolidone (mass ratio is conductive carbon black: After mixing polyvinylpyrrolidone=4.9:0.1) and NMP (solid content is 2%) and kneading, the revolution is 20 revolutions / min, and the rotation is 300 revolutions / min; kneading for 2 hours to obtain mixture 2; mix mixture 1 and mixture 2 (mass ratio It is elemental silicon: conductive carbon black=90:4.9) mixed together, continue kneading, revolution is 20 turns / min, and rotation is 300 turns / min; After kneading 2h, obtain polymer monomer, nano-silicon-based material,...

Embodiment 3

[0048] Embodiment 3 is different from Embodiment 1 in that this embodiment includes the following steps:

[0049] Step 1, kneading: elemental silicon, methyl methacrylate, and tetraethoxysilane (mass ratio: elemental silicon: methyl methacrylate: tetraethoxysilane=90:4:1) with a particle size of 100 nm ), NMP after mixing (solid content is 10%) kneading, revolution is 10 revs / min, and rotation is 100 revs / min; Kneading 4h obtains mixture 1; Conductive carbon black, polyvinylpyrrolidone (mass ratio is conductive carbon black: After mixing polyvinylpyrrolidone=4.9:0.1) and NMP (solid content is 5%) and kneading, the revolution is 10 revolutions / min, and the rotation is 100 revolutions / min; kneading 4h obtains mixture 2; Mixture 1, mixture 2 (mass ratio Be elemental silicon: conductive carbon black=90:4.9) mix together, continue to knead, revolution is 20 turns / min, and rotation is 100 turns / min; After kneading 4h, obtain polymer monomer, nano-silicon-based material, conductive c...

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Abstract

The invention belongs to the field of energy storage research, and particularly 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 comprises a secondary granule structure which is formed by performing tight stacking after nanometer primary granules are uniformly dispersed in a conductive agent; the nanometer primary granules comprise nanometer silicon-based granules; a conductive network is distributed between the nanometer silicon-based granules, between the conductive agents, and between the nanometer silicon-based granules and the conductive agents; and the conductive network is tightly connected with the nanometer silicon-based granules and the conductive agents, thereby ensuring the excellent electrochemical performance of the silicon-carbon negative electrode material.

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): H01M4/38H01M4/62H01M4/1395
CPCH01M4/1395H01M4/386H01M4/622H01M4/624H01M4/625Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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