A lithium metasilicate-doped graphene lithium-ion battery negative electrode material and preparation method thereof

A lithium-ion battery and lithium metasilicate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems affecting graphene cycle performance and rate performance, accumulation or agglomeration, etc., to achieve convenient transportation and simple preparation methods , the effect of good capacity

Inactive Publication Date: 2019-11-29
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the Van der Waals force, graphene nanosheets are prone to stacking or agglomeration, which will affect the cycle performance and rate performance of graphene as an anode material.

Method used

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  • A lithium metasilicate-doped graphene lithium-ion battery negative electrode material and preparation method thereof
  • A lithium metasilicate-doped graphene lithium-ion battery negative electrode material and preparation method thereof
  • A lithium metasilicate-doped graphene lithium-ion battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add the silicon powder and graphite oxide mixture to the ethanol aqueous solution of lithium hydroxide, wherein the concentration of silicon powder is 7.5g / L, the mass ratio of graphite oxide in the silicon powder and graphite oxide mixture is 33%, lithium hydroxide and silicon powder The mol ratio is: lithium hydroxide: silicon powder=2:1, and the volume ratio of dehydrated alcohol and water in the ethanol aqueous solution is: V 无水乙醇 :V 水 = 3:1; Stir evenly afterwards to prepare the reaction mixture, then place it in a polytetrafluoroethylene-lined stainless steel reactor, react at a hydrothermal temperature of 180°C for 18h, filter and wash the resulting product in an oven Drying at 60°C yields Li 2 SiO 3 / GE precursor, and then sintered at 600°C in an argon atmosphere for 3 hours to obtain the product.

[0027] The XRD and SEM figures of the product are as follows figure 1 and figure 2 shown. Depend on figure 1 It can be seen that the main diffraction peaks o...

Embodiment 2

[0029] Add the silicon powder and graphite oxide mixture to the ethanol aqueous solution of lithium hydroxide, wherein the concentration of silicon powder is 7.5g / L, the mass ratio of graphite oxide in the silicon powder and graphite oxide mixture is 0.5%, lithium hydroxide and silicon powder The mol ratio is: lithium hydroxide: silicon powder=2:1, and the volume ratio of dehydrated alcohol and water in the ethanol aqueous solution is: V 无水乙醇 :V 水 = 3:1; Stir evenly afterwards to prepare the reaction mixture, then place it in a polytetrafluoroethylene-lined stainless steel reactor, react at a hydrothermal temperature of 160°C for 24h, filter and wash the product in an oven at 50 ℃ dried to obtain Li 2 SiO 3 / GE precursor, and then sintered in an argon atmosphere at 500 °C for 4 hours to obtain the product lithium metasilicate-doped graphene (Li 2 SiO 3 / GE) material.

Embodiment 3

[0031] Add the silicon powder and graphite oxide mixture to the ethanol aqueous solution of lithium hydroxide, wherein the concentration of silicon powder is 7.5g / L, the mass ratio of graphite oxide in the silicon powder and graphite oxide mixture is 40%, lithium hydroxide and silicon powder The mol ratio is: lithium hydroxide: silicon powder=2:1, and the volume ratio of dehydrated alcohol and water in the ethanol aqueous solution is: V 无水乙醇 :V 水 = 3:1; Stir evenly afterwards to prepare the reaction mixture, then place it in a polytetrafluoroethylene-lined stainless steel reactor, react at a hydrothermal temperature of 200°C for 16h, filter and wash the product in an oven at 80 ℃ dried to obtain Li 2 SiO 3 / GE precursor, and then sintered in an argon atmosphere at 600°C for 4 hours to obtain the product lithium metasilicate-doped graphene (Li 2 SiO 3 / GE) material.

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Abstract

The invention belongs to the technical field of a lithium ion battery, and particularly relates to a lithium ion battery anode material. The invention particularly discloses a lithium metasilicate doped graphene lithium ion battery anode material, which is prepared by the following steps of: adding a mixture of silicon powder and graphite oxide into aqueous solution of ethanol, which contains lithium hydroxide, and synthesizing a Li2SiO3 / GE precursor by adopting a hydrothermal method; and sintering the Li2SiO3 / GE precursor under the protection of argon to obtain the lithium metasilicate doped graphene lithium ion battery anode material. The lithium metasilicate doped graphene lithium ion battery anode material provided by the invention, by experimental proofs, can improve specific capacity and cycle performance of a battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery negative electrode material. Background technique [0002] With the development of electric vehicles and aerospace electronic equipment, the requirements for the specific capacity and cycle performance of lithium-ion batteries are getting higher and higher, and the performance of lithium-ion batteries depends on the performance of key materials, thus promoting new lithium-ion battery electrode materials development and research. [0003] The anode material of the lithium-ion battery plays a key role in the performance of the whole battery, so the anode material has become a research hotspot. Graphene has the advantages of excellent electrical conductivity, ultra-high specific surface area and good mechanical strength, and is considered to be the most potential negative electrode material for lithium-ion batteries. However, due to the van der ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/0525
CPCH01M4/362H01M4/5825H01M4/587H01M10/0525Y02E60/10
Inventor 王秋芬杨帅缪娟赵晓雷阳虹张大峰陈玉梅毕文彦
Owner HENAN POLYTECHNIC UNIV
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