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Graphene-based lithium ion battery negative electrode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of increasing ion conduction paths, increasing battery costs, easy accumulation or agglomeration, etc., to improve the first Coulombic efficiency , good cycle performance and high coulombic efficiency

Pending Publication Date: 2020-11-20
南京彼洲生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still many problems to be solved for graphene to move from the laboratory to commercial application, especially the low coulombic efficiency of graphene for the first time, which will greatly increase the amount of positive electrode materials, thereby increasing the cost of the entire battery
Moreover, due to the van der Waals force, graphene is prone to stacking or agglomeration, which increases the ion conduction path and affects the cycle performance of graphene as a negative electrode material.
[0006] Patent CN106784747B discloses a graphene-based lithium-ion battery negative electrode material, which includes three-dimensional porous graphene and non-carbon materials supported on three-dimensional porous graphene. The negative electrode material has a rich pore structure, but its design focuses on meeting the needs of non-carbon The volume expansion of active materials still has not solved the problem of low initial Coulombic efficiency, and the indicators such as specific capacity and cycle performance are not good, and there is still a lot of room for improvement

Method used

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  • Graphene-based lithium ion battery negative electrode material and preparation method thereof

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Embodiment 1

[0034] A preparation method of a graphene-based lithium ion battery negative electrode material, comprising the steps of:

[0035] (1) First modify niobium and tin-doped graphene with 7-octenyltrichlorosilane to obtain silanized graphene;

[0036] (2) react silanized graphene with 4-bromo-2-(2-nitro-1-propenyl)thiophene to obtain modified graphene;

[0037] (3) Finally, the modified graphene and 2-vinyl thiophene are used as raw materials for polymerization to obtain a graphene-based negative electrode material for lithium-ion batteries;

[0038]Wherein, the niobium and tin-doped graphene is made from niobium pentachloride, tin tetrachloride and liquid polyacrylonitrile in a mass ratio of 0.01:0.05:1.

[0039] The preparation method of niobium and tin-doped graphene is as follows: first add niobium pentachloride and tin tetrachloride to hydrochloric acid solution with a mass concentration of 36%, and ultrasonically oscillate evenly, then add a 40% aqueous ethanol solution wit...

Embodiment 2

[0051] A preparation method of a graphene-based lithium ion battery negative electrode material, comprising the steps of:

[0052] (1) First modify niobium and tin-doped graphene with 7-octenyltrichlorosilane to obtain silanized graphene;

[0053] (2) react silanized graphene with 4-bromo-2-(2-nitro-1-propenyl)thiophene to obtain modified graphene;

[0054] (3) Finally, the modified graphene and 2-vinyl thiophene are used as raw materials for polymerization to obtain a graphene-based negative electrode material for lithium-ion batteries;

[0055] Wherein, the niobium and tin-doped graphene is made from niobium pentachloride, tin tetrachloride and liquid polyacrylonitrile in a mass ratio of 0.02:0.03:1.

[0056] The preparation method of niobium and tin-doped graphene is as follows: first add niobium pentachloride and tin tetrachloride to hydrochloric acid solution with a mass concentration of 38%, and ultrasonically oscillate evenly, then add a 30% ethanol aqueous solution wi...

Embodiment 3

[0068] A preparation method of a graphene-based lithium ion battery negative electrode material, comprising the steps of:

[0069] (1) First modify niobium and tin-doped graphene with 7-octenyltrichlorosilane to obtain silanized graphene;

[0070] (2) react silanized graphene with 4-bromo-2-(2-nitro-1-propenyl)thiophene to obtain modified graphene;

[0071] (3) Finally, the modified graphene and 2-vinyl thiophene are used as raw materials for polymerization to obtain a graphene-based negative electrode material for lithium-ion batteries;

[0072] Wherein, the niobium and tin-doped graphene is made from niobium pentachloride, tin tetrachloride and liquid polyacrylonitrile in a mass ratio of 0.015:0.04:1.

[0073] The preparation method of niobium and tin-doped graphene is as follows: first add niobium pentachloride and tin tetrachloride to hydrochloric acid solution with a mass concentration of 37%, and ultrasonically oscillate evenly, then add a 35% ethanol aqueous solution w...

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Abstract

The invention discloses a graphene-based lithium ion battery negative electrode material and a preparation method thereof. The method comprises the steps that niobium and tin doped graphene is modified with 7-octenyl trichlorosilane to obtain silanized graphene, then the silanized graphene is reacted with 4-bromo-2-(2-nitro-1-propenyl) thiophene, and modified graphene is obtained; finally, the modified graphene and 2-vinylthiophene are used as raw materials, a polymerization reaction is performed to obtain the graphene-based lithium ion battery negative electrode material, and the graphene-based lithium ion battery negative electrode material is high in initial coulombic efficiency, high in specific capacity and excellent in cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a graphene-based lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] With economic development and social progress, traditional energy sources such as coal, oil, and natural gas cannot meet the needs of human social development on the one hand, and have brought serious environmental pollution on the other. Therefore, the development and utilization of new energy has become the most Urgent needs. [0003] Due to the advantages of high energy density, long cycle life, high working voltage, and no memory effect, lithium-ion batteries have been widely used in portable electronic devices, electric vehicles, aerospace and other fields. Lithium-ion batteries are secondary rechargeable batteries, which mainly rely on lithium ions to move between the positive and negative electrodes. During charging and discharging...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F228/06C01B32/194H01M4/36H01M4/587H01M4/62H01M10/0525
CPCC08F292/00C01B32/194H01M4/366H01M4/587H01M4/624H01M10/0525H01M2004/021H01M2004/027C08F228/06Y02E60/10
Inventor 王和森
Owner 南京彼洲生物科技有限公司
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