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

A graphene composite and negative electrode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of not being able to fully adapt to silicon volume shrinkage and expansion, high cost of synthesis process, and difficulty in commercialization, etc., to achieve protection of electrodes The effect of complete structure, low price and excellent electrochemical performance

Inactive Publication Date: 2017-03-22
NORTHEAST DIANLI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the flexibility of carbon materials in composite structures is relatively poor, which cannot fully adapt to the volume shrinkage and expansion of silicon during charging and discharging.
[0005] Chinese patent CN102306757A discloses a method for preparing a silicon / graphene composite negative electrode material for a lithium-ion battery, in which silicon powder is used as a silicon source to prepare a silicon / graphene composite material. First, the synthesis process is expensive and difficult to achieve commercialization; secondly A large amount of waste acid and organic pollutants will be generated during the preparation process

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0031] Take 2.0g of natural diatomite, heat it to 900°C at a heating rate of 5°C / min under air conditions, keep it warm for 4h, remove organic matter, and then wash it with 0.01mol / L sodium hydroxide alkali for 2.5h, and wash until medium properties, and then pickled with 6.0mol / L nitric acid solution at 95°C for 6h, and finally washed and dried at 80°C to obtain purified diatomite.

[0032] Mix the purified diatomite and magnesium powder at a mass ratio of 1:2.0, under the protection of argon, keep warm at 700°C for 3h, cool naturally to room temperature, and pickle the solid powder in 0.1mol / L hydrochloric acid solution for 12h, Then it is washed and dried to obtain silicon with a porous structure.

[0033] Weigh 0.35g of porous silicon and 0.15g of edible sugar, mix and dissolve in the aqueous solution, load it on the nickel foam by evaporation, place it in a tube furnace and heat it to 1050 under the conditions of a helium flow rate of 200sccm and a heating rate of 5°C / min...

Embodiment 2

[0036] Take 2.5g of natural diatomite, heat it to 850°C at a heating rate of 8°C / min under air conditions, keep it warm for 5h, remove organic matter, and then wash it with calcium hydroxide alkali with a concentration of 0.01mol / L for 3h until neutral , and then pickled with 5.0mol / L sulfuric acid solution at 95°C for 4h, and finally washed and dried at 80°C to obtain purified diatomite.

[0037] Mix the purified diatomaceous earth and magnesium powder at a mass ratio of 1:1.5, under the protection of helium, keep warm at 750°C for 3h, cool down to room temperature naturally, pickle the solid powder in 0.5mol / L hydrochloric acid solution for 15h, Then it is washed and dried to obtain silicon with a porous structure.

[0038] Weigh 0.35g of porous silicon and 0.20g of edible sugar, mix and dissolve in the aqueous solution, load it on the nickel foam by evaporation, place it in a tube furnace and heat it to 1000 under the conditions of a helium flow rate of 250sccm and a heatin...

Embodiment 3

[0041] Take 2.5g of natural diatomite, heat it up to 800°C at a heating rate of 10°C / min under air conditions, keep it warm for 2h, remove organic matter, and then wash it with sodium hydroxide with a concentration of 0.01mol / L for 3h until neutral , and then pickled with 6.0mol / L hydrochloric acid solution at 95°C for 6h, and finally washed and dried at 80°C to obtain purified diatomite.

[0042] Mix the purified diatomite and magnesium powder at a mass ratio of 1:2.0, under the protection of argon, keep warm at 750°C for 4h, cool down to room temperature naturally, pickle the solid powder in 0.1mol / L hydrochloric acid solution for 15h, Then it is washed and dried to obtain silicon with a porous structure.

[0043] Weigh 0.35g of porous silicon and 0.25g of glucose, mix and dissolve in aqueous solution, load it on foamed nickel by evaporation, and heat it to 1000°C in a tube furnace with a helium flow rate of 200 sccm and a heating rate of 20°C / min. , annealed at a hydrogen ...

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Abstract

The invention discloses a method for preparing a porous silicon / graphene composite lithium ion battery anode material by using diatomite as a raw material. The method is characterized by comprising the steps of diatomite purification, porous silicon preparation and porous silicon / graphene composite material preparation. The preparation method is scientific and reasonable, simple, convenient and practicable, low in cost, environmentally-friendly and high in practicability, raw materials are wide in sources, excellent conductivity and good mechanical performance of graphene are sufficiently utilized, the problems such as electrical conductivity and volume effect of a silica-based material are effectively improved, the method is directly used for the lithium ion battery anode material, and the reversible capacity still can reach 609.4 mAh / g after 100 times of cycle under the current density of 100 mA / g.

Description

technical field [0001] The invention relates to a method for preparing a negative electrode material of a porous silicon / graphene composite lithium ion battery by using diatomite as a raw material, in particular to a method for preparing a negative electrode material for a porous silicon / graphene composite lithium ion battery by using diatomite. Background technique [0002] With the increase of energy demand, non-renewable energy sources are gradually decreasing, which makes the environmental pollution caused by energy problems more serious. Therefore, seeking environmentally friendly, non-toxic and harmless new materials is the key to realize the commercialization of lithium-ion batteries. [0003] Silicon-based anode materials have the advantages of high theoretical capacity, low de-intercalation and burial platform, high reversible capacity, good safety performance, and abundant resources. They are the research hotspots of the new generation of buried ion battery materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 张瑛洁楚华赵丽文袁龙飞
Owner NORTHEAST DIANLI UNIVERSITY
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