Lithium ion battery silicon-carbon composite negative electrode material and preparation method thereof

A lithium-ion battery, silicon-carbon composite technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve problems such as high cost and complicated preparation process

Active Publication Date: 2021-09-07
孙仲振
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, methods for preparing silicon-carbon composite negative electrode materials include pyrolytic carbon source, spray method, sol-gel method, electrospinning method, etc. high

Method used

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  • Lithium ion battery silicon-carbon composite negative electrode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take 325-mesh natural zeolite powder, add dilute nitric acid with a concentration of 1.5mol / L to repeatedly wash and suction filter 4 times, then wash with water until neutral and dry; take the dried zeolite powder and mix it with aluminum powder, the aluminum in the aluminum powder and SiO in zeolite powder 2 The molar ratio of zeolite powder and aluminum powder is 1.17, and the mixture of zeolite powder and aluminum powder is placed in a tube furnace and calcined at a high temperature of 700 ° C for 2 hours, so that the aluminum powder can fully reduce the silica in the zeolite powder;

[0039] Wash the calcined product with dilute nitric acid with a concentration of 1.5mol / L to remove the Al produced by the reaction 2 o 3 and other impurities, then repeatedly washed with water and dried; then treated with ethanol solution for 2 hours, washed with water twice, the purpose is to dissolve the aluminum nitrate generated in the material; then mixed with 3mol / L hydrofluor...

Embodiment 2

[0043] Example 2: Porous silicon material was prepared by the same method as in Example 1.

[0044] Weigh 1000g of porous silicon powder and 640g of carbon powder, stir and mix thoroughly for 40 minutes, then add 360g of coal tar pitch micropowder, fully stir and mix at room temperature for 60 minutes, then put it into the sintering furnace, slowly raise the temperature to 1100°C for sintering, and then carry out sintering after cooling. Pulverize to obtain the first mixture; fully mix 2000g of natural graphite and 3000g of artificial graphite, and then add 550 g of lithium silicide and mix to obtain the second mixture.

[0045] Weigh the first mixed material 1200g and the second mixed material 2800g respectively, after fully mixing at room temperature for 1 hour, after mixing 70% of the first mixed material and 70% of the second mixed material, carry out the first ball milling process, the first mixed material The total weight of the second mixture and the solid-liquid ratio ...

Embodiment 3

[0047] Example 3: Porous silicon material was prepared by the same method as in Example 1.

[0048] Weigh 1000g of silicon powder and 600g of carbon powder, fully stir and mix for 40 minutes, then add 400g of asphalt, fully stir and mix at room temperature for 40 minutes, then put it into a sintering furnace, slowly raise the temperature to 1200°C for sintering, and pulverize after cooling to obtain the first 1. Mixed material: fully mix 1500g of natural graphite, 3000g of artificial graphite powder, and 500g of graphene, then add 550g of lithium silicide and mix to obtain the second mixed material.

[0049] Weigh 1600g of the first mixture and 2400g of the second mixture, mix the two raw materials at room temperature for 1 hour, then mix 70% of the first mixture and 70% of the second mixture for the first time Ball milling treatment, the total weight of the first mixture and the second mixture and the solid-liquid ratio of ethanol are 1:4, the ball milling speed is 260r / min, ...

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Abstract

The invention provides a lithium ion battery silicon-carbon composite negative electrode material and a preparation method thereof. The preparation method comprises the steps: enabling zeolite powder to be subjected to reduction treatment and purification treatment, and then obtaining a porous silicon material; adding graphite, mixing, adding coal pitch micro powder, performing full mixing at normal temperature, putting the mixture into a sintering furnace, performing sintering at high temperature, performing cooling, and performing crushing to obtain a first mixture; mixing the graphite material with lithium silicide to obtain a second mixture; mixing the first mixture and the second mixture according to a certain proportion, and carrying out wet ball milling twice, suction filtration and drying to prepare the silicon-carbon composite negative electrode material. The preparation method provided by the invention solves the technical problem that the existing porous silicon preparation method is tedious, and the silicon-carbon composite negative electrode material prepared from the porous silicon-based material has the characteristics of good conductivity, high specific capacity, high initial coulombic efficiency, good capacity retention ratio, long cycle life, simple process, high safety and the like.

Description

technical field [0001] The invention relates to the technical field of battery negative electrode materials, in particular to a silicon-carbon composite negative electrode material for a lithium ion battery and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries mainly use carbon-based materials based on natural graphite and artificial graphite as the negative electrode active material, and the manufacturing process formed in the production process of lithium-ion batteries is relatively mature. However, due to the relatively low theoretical specific capacity (372mAh / g) of graphite, it is difficult to further meet the high energy density requirements of lithium-ion belt batteries. [0003] As a negative electrode material, the theoretical specific capacity of silicon can reach 4200mah / g, and it is considered to be the most potential high-energy lithium-ion battery negative electrode material. However, during the charging and discharg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y40/00B82Y30/00
CPCH01M4/362H01M4/386H01M4/62H01M4/625H01M4/628H01M10/0525B82Y40/00B82Y30/00Y02E60/10
Inventor 孙仲振
Owner 孙仲振
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