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Silicon-carbon negative electrode material for lithium ion battery and preparation method of silicon-carbon negative electrode material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve problems such as sharp drop in battery capacity, loss of active materials, collapse of material structures, etc., to achieve Improvement of electronic conductivity, high first-time efficiency, and high specific capacity

Pending Publication Date: 2020-10-09
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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  • Silicon-carbon negative electrode material for lithium ion battery and preparation method of silicon-carbon negative electrode material
  • Silicon-carbon negative electrode material for lithium ion battery and preparation method of silicon-carbon negative electrode material
  • Silicon-carbon negative electrode material for lithium ion battery and preparation method of silicon-carbon negative electrode material

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Effect test

Embodiment 1

[0038] A method for preparing a silicon-carbon negative electrode material for a lithium-ion battery, comprising the steps of:

[0039](1) Grinding: adding 1000 g of silicon powder with a median particle size of 1 μm and a purity of 99.99% and propanol in the dispersion tank of the sand mill, controlling the solid content of the mixed solution to be 10%, adding grinding aid triethanolamine, three The mass ratio of ethanolamine to silicon powder is 1:100, and the stirring is started for 30 minutes; the material of the grinding beads is hard alloy, and the mass ratio of grinding beads to silicon powder is 30:1; the mixed solution in the stirring tank is introduced into the sand mill In the machine, the linear velocity of the sand mill is 16m / s, and the grinding time is 50h to obtain a silicon slurry; the mass content of the oxygen element of the silicon particles in the silicon slurry is 24% through the detection of an oxygen, nitrogen and hydrogen analyzer. SiO X It shows that...

Embodiment 2

[0044] (1) Grinding: 1000g of silicon powder with a median particle size of 5 μm and a purity of 99.97% and ethanol are added to the dispersion tank of the sand mill, and the solid content of the mixed solution is controlled to be 20%, and then the grinding aid sodium pyrophosphate, coke The mass ratio of sodium phosphate to silicon powder is 3:100, and the stirring is started for 30 minutes; the material of the grinding beads is agate, and the mass ratio of grinding beads to silicon powder is 25:1. Import the mixed solution in the stirring tank into a sand mill, the linear speed of the sand mill is 15m / s, and the grinding time is 106h to obtain a silicon slurry; the oxygen element of silicon particles in the silicon slurry is detected by an oxygen, nitrogen and hydrogen analyzer. The mass content is 33%, if the general formula SiO X It shows that its x value is 0.493; the median particle size of the silicon particles detected by the Mastersizer 3000 particle size analyzer is ...

Embodiment 3

[0049] (1) Grinding: Add 1000 g of silicon powder with a median particle size of 12 μm and a purity of 99.9% and isopropyl alcohol into the dispersion tank of the sand mill, control the solid content of the mixed solution to be 30%, and then add the grinding aid potassium citrate , the mass ratio of potassium citrate to silicon powder is 7:100, start stirring for 30 minutes; the material of the grinding beads is stainless steel, and the mass ratio of grinding beads to silicon powder is 20:1; the mixed solution in the stirring tank is introduced into the sand In the mill, the linear velocity of the sand mill is 14.5m / s, and the grinding time is 44h to obtain a silicon slurry; the mass content of the oxygen element in the silicon particles in the silicon slurry is 17% through the detection of an oxygen, nitrogen and hydrogen analyzer. Formula SiO X It shows that its x value is 0.205; the median particle size of the silicon particles detected by the Mastersizer 3000 particle size...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a silicon-carbon negative electrode material for a lithium ion battery and a preparation method of the silicon-carbon negative electrode material. The silicon-carbon negative electrode material comprises the following components in percentage by weight: 30%-60% of silicon particles, 0.5%-8% of zirconium oxide, 10%-30% of an asphalt cracking carbon source and 30%-60% of graphite particles, the silicon-based particles can be represented by SiOX, and x is greater than 0 and less than 0.5. When the silicon-carbon negative electrode material provided by the invention is used as a negative electrode active substance of the lithium ion battery, the battery capacity can be obviously increased, excellent cycle performance is achieved, and the raw material micron pure silicon is wide in application, low in price and suitable for large-scale production.

Description

technical field [0001] 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. Background technique [0002] At present, the conventional lithium ion negative electrode material is mainly graphite negative electrode, but the theoretical specific capacity of graphite negative electrode is only 372mAh / g, which cannot meet the urgent needs of users. The theoretical capacity of silicon is as high as 4200mAh / g, which is more than 10 times the capacity of graphite anode materials. At the same time, the coulombic efficiency of silicon-carbon composites is also close to that of graphite anodes. It is cheap, environmentally friendly, and has abundant earth reserves. It is a new generation of high-capacity The best choice for negative electrode materials. However, due to the poor conductivity of the silicon material itself, and the volum...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/362H01M4/386H01M4/62H01M4/625H01M4/628H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 胡亮张少波俞有康李晓马张志权
Owner MAANSHAN KEDA PURUI ENERGY TECH CO LTD
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