A kind of silicon carbon negative electrode material for lithium ion battery and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc. The effect of reducing internal resistance, improving electrical conductivity and saving costs

Active Publication Date: 2022-05-24
MAANSHAN KEDA PURUI ENERGY TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the poor conductivity of the silicon material itself, and the volume expansion of silicon during charging is as high as 300%, the volume expansion during charging and discharging can easily lead to the collapse of the material structure and the peeling and pulverization of the electrodes, resulting in the loss of active materials, which in turn leads to a sharp drop in battery capacity. decrease, the cycle performance is seriously deteriorated

Method used

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  • A kind of silicon carbon negative electrode material for lithium ion battery and preparation method thereof
  • A kind of silicon carbon negative electrode material for lithium ion battery and preparation method thereof
  • A kind of silicon carbon negative electrode material for lithium ion battery and preparation method thereof

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Embodiment 1

[0042] A preparation method of silicon carbon negative electrode material for lithium ion battery, comprising the following steps:

[0043] (1) Preparation of nano-silicon slurry: 1000 g of polycrystalline silicon powder with a median particle size of 3 μm and 10 g of polyvinylpyrrolidone were added to methanol according to the mass ratio of silicon powder: polyvinylpyrrolidone=100:1, and the solid content of the mixed solution was 20%, introduce the mixed slurry into a sand mill, wherein the mass ratio of grinding beads zirconia balls and silicon powder is 10:1, and the grinding time is 50h to obtain the required nano-silicon slurry; the nano-silicon slurry passes through Mastersizer 3000 particle size analyzer detection, the median particle size of nano-silicon is 72nm;

[0044] (2) Atomization and drying: the nano-silicon slurry in step (1) is atomized and dried by a closed-type spray dryer, and the hot air inlet temperature of the spray dryer is 190° C., and the outlet tem...

Embodiment 2

[0048] (1) Preparation of nano-silicon slurry: 1000 g of polycrystalline silicon powder with a median particle size of 8 μm and 50 g of sodium dodecyl sulfate were added to propanol according to the mass ratio of silicon powder: sodium dodecyl sulfate = 100:5 , the solid content of the mixed solution is 20%, and the mixed slurry is introduced into the sand mill, wherein the mass ratio of grinding beads cemented carbide balls and silicon powder is 10:1, and the grinding time is 60h to obtain the desired nano-silica slurry. The nano-silicon slurry was tested by Mastersizer 3000 particle size analyzer, and the median particle size of nano-silicon was 78nm;

[0049] (2) Atomization and drying: the nano-silicon slurry in step (1) is atomized and dried by a closed-type spray dryer, and the hot air inlet temperature of the spray dryer is 280° C., and the outlet temperature is 130° C. to obtain nano-silicon dry powder;

[0050] (3) Mechanical shaping: the nano-silicon dry powder obta...

Embodiment 3

[0053] (1) Preparation of nano-silicon slurry: Add 1000 g of polysilicon powder with a median particle size of 15 μm and 100 g of gul gum, according to the mass ratio of silicon powder: gul gum = 100:10, into acetone, and the solid content of the mixed solution is 30%, introduce the mixed slurry into a sand mill, wherein the mass ratio of grinding beads stainless steel balls and silicon powder is 10:1, and the grinding time is 40h to obtain the required nano-silicon slurry; the nano-silicon slurry is passed through Mastersizer 3000 particle size analyzer detection, the median particle size of nano-silicon is 85nm;

[0054] (2) Atomization and drying: the nano-silicon slurry in step (1) is atomized and dried by a closed-type spray dryer, and the hot air inlet temperature of the spray dryer is 200°C, and the outlet temperature is 100°C to obtain nano-silicon dry powder;

[0055] (3) Mechanical shaping: the nano-silicon dry powder obtained in step (2) is processed by a pulverize...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a silicon-carbon negative electrode material for lithium ion batteries and a preparation method thereof. Part of the surface is covered by the carbon source of vapor deposition, the median particle size D50 of the nano-silicon is below 100nm; the crystal grains of the nano-silicon are below 10nm; the average thickness of the vapor-deposited carbon source is 10-200nm; in the nano-silicon Contains oxygen, the mass content of oxygen element is 5-30%, the negative electrode material contains 60%-90wt.% nano-silicon, 10%-40wt.% gas-phase carbon source; compared with the prior art, the present invention The prepared silicon-carbon anode material for lithium-ion batteries has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and particularly relates to a silicon carbon negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] At present, the conventional lithium ion anode materials are mainly graphite anodes, but the theoretical specific capacity of graphite anodes is only 372mAh / g, which can no longer meet the urgent needs of users. The theoretical capacity of silicon is as high as 4200mAh / g, which is more than 10 times that of the graphite anode material. At the same time, the coulombic efficiency of the silicon-carbon composite product is also close to that of the graphite anode, and it is cheap, environmentally friendly, and rich in earth reserves. It is a new generation of high-capacity products. The best choice for negative electrode materials. However, due to the poor conductivity of the silicon material itself, and the volume expansion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/362H01M4/386H01M4/62H01M4/625H01M4/628H01M10/0525B82Y30/00B82Y40/00Y02E60/10H01M4/366H01M4/587H01M4/134H01M4/1395H01M2004/027H01M4/0421H01M4/583H01M2004/021
Inventor 张小龙胡亮张少波王浩
Owner MAANSHAN KEDA PURUI ENERGY TECH CO LTD
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