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A kind of silicon composite material for lithium battery and preparation method thereof

A silicon composite material and lithium battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high expansion rate of silicon carbon negative electrode materials, reduced service life of materials, low reversible capacity, etc., and achieve excellent electrochemical performance, The effect of increasing the service life and increasing the number of cycles

Active Publication Date: 2021-07-23
中溢集团(吉林)新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Silicon composite materials are important electrode materials in lithium batteries. The existing silicon composite materials mostly use silicon-carbon composite materials. Due to the high expansion rate of silicon-carbon negative electrode materials and low reversible capacity, the service life of the material is seriously reduced after recycling. , it is easy to cause the battery cycle life to be low, so it is not suitable for promotion and use

Method used

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  • A kind of silicon composite material for lithium battery and preparation method thereof
  • A kind of silicon composite material for lithium battery and preparation method thereof
  • A kind of silicon composite material for lithium battery and preparation method thereof

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Embodiment 1

[0027] A kind of silicon composite material for lithium battery, its raw material is as follows by weight part: 18 parts of silicon powder, 18 parts of carbon material, 5 parts of asphalt, 20 parts of THF solvent, 20 parts of potassium chloride solution, 3 parts of catalyst, 1 part of nickel oxide parts, 10 parts of polystyrene, 30 parts of organic solvent, and the carbon material is any two of graphite, mesophase microspheres, carbon black, amorphous carbon, carbon nanotubes, carbon nanowires, carbon gel and graphene. species, and the carbon materials are both in powder structure, and the weight ratio of the two materials is 1:1, the concentration of the tetrahydrofuran solvent is at least 40%, and the concentration of the potassium chloride solution is at least 30%, so The catalyst is any one of Ag, Au, Mo, Cu and Ti, and is powdery particles, and the organic solvent includes absolute ethanol, acetone, dimethylformamide, N-N-diethylacetamide, A mixed solvent of N-methyl-2-py...

Embodiment 2

[0039]A kind of silicon composite material for lithium battery, its raw material is as follows by weight part: 24 parts of silicon powder, 24 parts of carbon material, 6 parts of asphalt, 30 parts of THF solvent, 30 parts of potassium chloride solution, 4 parts of catalyst, nickel oxide 2 parts 12 parts, 12 parts of polystyrene, 35 parts of organic solvent, and the carbon material is any two of graphite, mesophase microspheres, carbon black, amorphous carbon, carbon nanotubes, carbon nanowires, carbon gel and graphene. species, and the carbon materials are both in powder structure, and the weight ratio of the two materials is 1:1, the concentration of the tetrahydrofuran solvent is at least 40%, and the concentration of the potassium chloride solution is at least 30%, so The catalyst is any one of Ag, Au, Mo, Cu and Ti, and is powdery particles, and the organic solvent includes absolute ethanol, acetone, dimethylformamide, N-N-diethylacetamide, A mixed solvent of N-methyl-2-py...

Embodiment 3

[0051] A kind of silicon composite material for lithium battery, its raw material is as follows by weight: 30 parts of silicon powder, 30 parts of carbon material, 7 parts of asphalt, 40 parts of tetrahydrofuran solvent, 40 parts of potassium chloride solution, 5 parts of catalyst, nickel oxide 3 parts 14 parts of polystyrene, 40 parts of organic solvent, the carbon material is any two of graphite, mesophase microspheres, carbon black, amorphous carbon, carbon nanotubes, carbon nanowires, carbon gel and graphene. species, and the carbon materials are both in powder structure, and the weight ratio of the two materials is 1:1, the concentration of the tetrahydrofuran solvent is at least 40%, and the concentration of the potassium chloride solution is at least 30%, so The catalyst is any one of Ag, Au, Mo, Cu and Ti, and is powdery particles, and the organic solvent includes absolute ethanol, acetone, dimethylformamide, N-N-diethylacetamide, A mixed solvent of N-methyl-2-pyrrolid...

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Abstract

The invention discloses a silicon composite material for lithium batteries. The raw materials are as follows in parts by weight: 18-30 parts of silicon powder, 18-30 parts of carbon material, 5-7 parts of asphalt, 20-40 parts of tetrahydrofuran solvent, chlorinated 20-40 parts of potassium solution, 3-5 parts of catalyst, 1-3 parts of nickel oxide, 10-14 parts of polystyrene, 30-40 parts of organic solvent. The present invention strictly controls the silicon composite material for lithium batteries and its preparation method, by strictly controlling the proportion of each component of the silicon composite material for lithium batteries and the preparation process parameters, and by sequentially treating the raw materials through tetrahydrofuran solvent and potassium chloride solution After that, the reversible capacity of the composite material exceeds 650mAh / g, and the reversible capacity remains above 560mAh / g after 50 cycles, and the electrochemical performance is excellent. After the addition of polystyrene and cracking treatment, the reversible capacity of the composite material is The capacity exceeds 800mAh / g, which further increases the cycle times of the product, improves the service life, and is suitable for widespread promotion.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a silicon composite material for lithium batteries, and at the same time, the invention also relates to a preparation method of the silicon composite material for lithium batteries. Background technique [0002] Lithium battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. In 1912, the lithium metal battery was first proposed and studied by Gilbert N. Lewis. In the 1970s, M.S.Whittingham proposed and began to study lithium-ion batteries. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. Therefore, lithium batteries have not been used for a long time. With the development of science and technology, lithium batteries have become the mainstream now. [0003] Silicon composi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38
CPCH01M4/364H01M4/386Y02E60/10
Inventor 关宝树蔺长银董汉元张影
Owner 中溢集团(吉林)新能源科技有限公司