A kind of silicon carbon negative electrode material and preparation method thereof

A negative electrode material, silicon carbon technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve problems such as disconnection, affecting the electrochemical performance of silicon carbon materials, weak adhesion, etc., to reduce energy consumption and solid content The effect of increasing and reducing the dosage

Active Publication Date: 2020-08-18
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of silicon carbon negative electrode material and preparation method thereof

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Embodiment 1

[0037] Embodiment 1, the difference from the comparative example is that this embodiment includes the following steps:

[0038] Step 1. Kneading: Combine elemental silicon, methyl methacrylate and tetraethoxysilane with a particle size of 100nm (the mass ratio is: elemental silicon: methyl methacrylate: tetraethoxysilane = 90:4:1 ), NMP (solid content is 1%) and kneaded after mixing, the revolution is 60 revolutions / min, the rotation is 500 revolutions / min; kneading for 2 hours to obtain mixture 1; the conductive carbon black, polyvinylpyrrolidone (the mass ratio is conductive carbon black: Polyvinylpyrrolidone=4.9:0.1) and NMP (solid content of 0.5%) are mixed and kneaded, the revolution is 60 revolutions / min, and the rotation is 500 revolutions / min; kneading 2h to obtain mixture 2; mix mixture 1, mixture 2 (mass ratio Is elemental silicon: conductive carbon black=90:4.9) mix together, continue kneading, revolution is 20 revolutions / min, rotation is 300 revolutions / min; after kn...

Embodiment 2

[0043] The second embodiment is different from the first embodiment in that this embodiment includes the following steps:

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

Embodiment 3

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

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

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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, and particularly relates to a silicon carbon anode material and a preparation method thereof. Background technique [0002] Lithium-ion battery has the advantages of large specific energy, high working voltage, small self-discharge rate, small size, light weight, etc. Since its birth, it has brought revolutionary changes to the field of energy storage and is widely used in various In portable electronic devices and electric cars. However, with the improvement of people's living standards, higher user experience puts forward higher requirements on 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 , Has been unable to meet the ur...

Claims

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Application Information

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Patent Type & Authority Patents(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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