Three-dimensional porous silicon/graphene composite negative electrode material, preparation method thereof and lithium ion battery

A graphene composite, negative electrode material technology, applied in batteries, battery electrodes, secondary batteries, etc., can solve the problems of silicon dispersion and agglomeration, limited stability, environmental pollution, etc. The effect of high current charge and discharge, reduce polarization, and improve cycle performance

Pending Publication Date: 2022-02-22
上海昱瓴新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of nanomaterials is not effective in improving the cycle performance of alloy materials; although a single active doping or inert doping can partially inhibit the volume expansion of silicon-based materials, it still cannot completely solve the problem of silicon dispersion and agglomeration; other methods improve The effect of stability is limited, and there is a large pollution to the environment

Method used

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  • Three-dimensional porous silicon/graphene composite negative electrode material, preparation method thereof and lithium ion battery
  • Three-dimensional porous silicon/graphene composite negative electrode material, preparation method thereof and lithium ion battery
  • Three-dimensional porous silicon/graphene composite negative electrode material, preparation method thereof and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Silicon dioxide with an average particle size of 0.2 μm was heated to 500° C. at a heating rate of 3° C. / min under atmospheric pressure and kept for 1 hour to remove organic impurities. Then add graphene or graphene oxide dispersed in 1mol / L sulfuric acid solution, stir and disperse with 100r / min magnetic force at room temperature for 1h, and finally filter, wash with deionized water, and dry at 50°C for 1h to obtain an intermediate product a.

[0043]The intermediate product A was reduced to obtain the intermediate product B by using 3 μm aluminum powder (Al) as a reducing agent at a reduction temperature of 650° C. and keeping it in a vacuum atmosphere for 1 hour.

[0044] Put the intermediate product B into 2.0mol / L hydrochloric acid for pickling for 0.5h, then wash with deionized water, filter, and dry at 50°C for 1h under argon atmosphere to obtain a three-dimensional porous silicon / graphene negative electrode material.

[0045] The obtained three-dimensional poro...

Embodiment 2

[0047] Porous silica with an average particle size of 3 μm was heated to 600° C. at a heating rate of 10° C. / min under atmospheric pressure and kept for 2 hours to remove organic impurities. Then add graphene or graphene oxide dispersed in a 3mol / L sulfuric acid solution, mechanically stir at 500r / min at room temperature to disperse and compound for 2h, and finally filter, wash with deionized water, and dry at 80°C for 1.5h to obtain an intermediate product a.

[0048] The intermediate product A was reduced to obtain the intermediate product B by using 3 μm aluminum powder (Al) as a reducing agent at a reduction temperature of 750° C. and keeping the temperature for 3 hours in a vacuum atmosphere.

[0049] Put the intermediate product B into 2.5 mol / L hydrochloric acid for pickling for 1 h, then wash with deionized water, filter, and dry at 50°C for 3 h under a nitrogen atmosphere to obtain a three-dimensional porous silicon / graphene negative electrode material.

[0050] fi...

Embodiment 3

[0053] Diatomite with an average particle size of 7 μm was heated to 550° C. at a heating rate of 20° C. / min under atmospheric pressure and kept for 2 hours to remove organic impurities. Then add graphene or graphene oxide dispersed in 1mol / L sulfuric acid solution, stir and disperse at room temperature at 800r / min for 1h, and finally filter, wash with deionized water, and dry at 80°C for 2h to obtain intermediate product A.

[0054] With 3μm aluminum powder (Al) and 10μm titanium hydride powder (TiH 2 ) are mixed at a mass ratio of 9:1 as a reducing agent, the reduction temperature is 650°C, and the intermediate product A is reduced to obtain the intermediate product B under a vacuum atmosphere for 5 hours.

[0055] Put the intermediate product B into 5.0 mol / L hydrochloric acid for pickling for 3 hours, then wash with deionized water, filter, and dry at 60°C for 1 hour in an argon atmosphere to obtain a three-dimensional porous silicon / graphene negative electrode material. ...

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Abstract

The invention relates to a three-dimensional porous silicon / graphene composite negative electrode material, a preparation method thereof and a lithium ion battery. According to the method, graphene or graphene oxide dispersed in sulfuric acid is ingeniously compounded with a silicon dioxide source needing to be purified in situ, the contour structure of silicon dioxide particles in thermal reduction and acid pickling is protected by a graphene or graphene oxide layer, and finally, three-dimensional porous silicon and graphene are successfully compounded. Compared with the prior art, the material has the advantages that the synergistic interaction effect of the three-dimensional porous silicon and the graphene is utilized, advantage complementation is achieved, micro-nano pores in the porous silicon can well inhibit volume expansion of the porous silicon in the lithium intercalation process, the volume effect of the electrode material is relieved through compounding of the graphene, and the electrochemical properties such as conductivity, cycling stability, charge-discharge efficiency and rate capability of a silicon negative electrode can be better improved. The material is expected to replace graphite to become a novel lithium ion battery negative electrode material, and has very high value in the application aspect of pure electric and hybrid electric vehicles.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a three-dimensional porous silicon / graphene composite negative electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] With the advancement of electronics industry, electric vehicles and aerospace technology, higher requirements are placed on the performance of lithium-ion batteries. Therefore, in order to achieve breakthroughs in energy density and power density of lithium-ion batteries, the crucial "bottleneck" issue is how to design and develop new electrode materials. In the research field of lithium-ion batteries, the research focus is on negative electrode materials. At present, the theoretical lithium storage capacity of the graphite electrode itself is relatively low (LiC 6 , 372mAh / g) makes it difficult to make breakthroughs. Therefore, it is extremely urgent to research and develop new negative electrode material...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/62H01M4/625H01M4/628H01M10/0525H01M2220/20Y02E60/10
Inventor 刘萍万文文王磊徐怀良常凯铭
Owner 上海昱瓴新能源科技有限公司
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