Method for preparing porous silicon/graphene composite lithium ion battery anode material using diatomite as raw material

A graphene composite, lithium-ion battery technology, applied in the field of materials, can solve problems such as high cost and pollute the environment, and achieve the effects of low price, good electronic conduction, and buffer volume effect

Inactive Publication Date: 2016-12-21
NORTHEAST DIANLI UNIVERSITY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing preparation process of polluting the environment and high cost, and to provide a scientific and reasonable, simple and easy to implement, low cost, excellent electrochemical performance, good effect, and environmentally friendly, which uses diatomite as raw material to prepare porous Method for silicon / graphene composite lithium-ion battery negative electrode material

Method used

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  • Method for preparing porous silicon/graphene composite lithium ion battery anode material using diatomite as raw material
  • Method for preparing porous silicon/graphene composite lithium ion battery anode material using diatomite as raw material
  • Method for preparing porous silicon/graphene composite lithium ion battery anode material using diatomite as raw material

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Embodiment 1

[0027] Take 2.0g of natural diatomite, heat it to 900°C at a heating rate of 5°C / min under air (atmospheric pressure), keep it warm for 4h, remove organic matter, and then wash it with 0.01mol / L sodium hydroxide alkali for 2.5h , washed to neutral, then pickled with 6.0mol / L sulfuric acid solution at 95°C for 6h, finally washed with deionized water and dried at 80°C to obtain purified diatomite; the purified diatomite and magnesium powder Mix according to the mass ratio of 1:2, under the protection of argon, keep warm at 700°C for 3h, cool naturally to room temperature, pickle the solid powder in 0.1mol / L hydrochloric acid solution for 12h, then wash and dry to obtain porous silicon; Take 0.35g of porous silicon as the substrate, under the action of nickel foam, heat to 950°C in a tube furnace with a helium flow rate of 200 sccm, and then naturally cool down and anneal for 5 minutes under a hydrogen flow rate of 20 sccm, and then control the ethanol by argon flow rate. Quantit...

Embodiment 2

[0029] Take 2.5g of natural diatomite, heat it to 800°C at a heating rate of 8°C / min under air (atmospheric pressure), keep it warm for 4h, remove organic matter, then wash it with 0.02M sodium hydroxide alkali for 5h, and wash until Neutral, then pickled with 6.0mol / L sulfuric acid solution at 95°C for 6h, finally washed with deionized water and dried at 80°C to obtain purified diatomite; the purified diatomite and magnesium powder Mix at a ratio of 1:1, under the protection of helium, keep warm at 850°C for 3h, cool naturally to room temperature, pickle the solid powder in 0.5mol / L hydrochloric acid solution for 18h, then wash with deionized water and dry at 80°C to obtain Porous silicon: take 0.35g of porous silicon as the substrate, under the action of nickel foam, heat to 1000°C in a tube furnace with an argon flow rate of 300 sccm, anneal for 10 minutes at a hydrogen flow rate of 30 sccm, and then pass through the acetylene carbon source , flow rate is 12sccm, pyrolytic ...

Embodiment 3

[0031] Take 5.0g of natural diatomite, heat it up to 650°C at a heating rate of 10°C / min under air (atmospheric pressure), keep it warm for 2h, remove organic matter, then wash with 0.05M sodium hydroxide alkali for 3h, and wash until Neutral, then pickled with 6.0M sulfuric acid solution at 95°C for 5h, finally washed with deionized water, and dried at 80°C to obtain purified diatomite; the purified diatomite and magnesium powder are in a mass ratio of 1: 1 mixed, under the protection of argon, keep warm at 850°C for 3h, naturally cool to room temperature, pickle the solid powder in 2.0mol / L hydrochloric acid solution for 15h, then wash with deionized water and dry at 80°C to obtain porous silicon See figure 2Get 0.35g of porous silicon as the substrate, under the action of copper powder and nickel, heat to 1000° C. under the argon flow rate of 200 sccm in the tube furnace, anneal treatment for 10 min under the hydrogen flow rate of 20 sccm, and then feed the acetylene carbo...

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Abstract

This invention is a method for preparing a porous silicon / graphene composite lithium ion battery anode material using diatomite as a raw material. The method is characterized by comprising the preparation steps of diatomite purification, preparation of porous silicon and preparation of porous silicon / graphene composite lithium ion battery anode material. The first-time reversible capacity of the prepared porous silicon / graphene composite lithium ion battery anode material is up to 1275.3 mAh / g under the current density of 100 mA / g, the capacity is kept to be 885.7 mAh / g after 50 times of circulation, and then the capacity is almost kept the same in the almost remain the same process. Due to the fact that the diatomite is used as the raw material, sources are wide, the price is low, the volume effect of the silicon can be effectively inhibited and the electrical conductivity of the material can be also improved through porous silicon and graphene composition, and the method is scientific, reasonable, simple, convenient, easy to operate, excellent in electrochemical performance, good in effect and the like, is beneficial to popularization and application, makes industrialization easily achieved and has remarkable economic and social benefits.

Description

technical field [0001] The invention relates to the field of material technology, and relates to a method for preparing a porous silicon / graphene composite lithium-ion battery negative electrode material by using diatomite as a raw material. Background technique [0002] In order to meet the needs of commercialization, it is an important research direction to seek new lithium ion anode materials with large specific capacity, high energy density, and high current charge and discharge. Studies have found that the theoretical specific capacity of silicon is as high as 4200mAh / g, and it can form a variety of alloy compounds with lithium, such as: Li 22 Si 5 , Li 13 Si 4 Wait. However, silicon has a severe volume effect, and in conventional LiPF 6 In the electrolyte, it is difficult to form a stable solid electrolyte interfacial film (SEI) on the surface, so that the irreversible capacity of the electrode continues to increase and the cycle performance decreases. However, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 张瑛洁楚华赵丽文袁龙飞
Owner NORTHEAST DIANLI UNIVERSITY
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