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Graphene/solid carbon sphere lithium ion negative electrode plate and button lithium ion battery preparation method thereof

A lithium ion battery and negative electrode technology, which is applied in the field of graphene/solid carbon ball lithium ion negative electrode sheet and the preparation of button-type lithium ion battery, can solve the problems of easy agglomeration, low capacitance, etc. Simple, low-cost effects

Inactive Publication Date: 2018-06-08
株洲市智汇知识产权运营服务有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, the effect of van der Waals force makes it easy to reunite or re-stack, resulting in the result that the actual specific capacitance is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment provides a method for preparing a graphene / solid carbon sphere lithium-ion battery negative electrode material, comprising the following steps:

[0036] S1. preparing solid carbon spheres;

[0037] S11. Prepare an aqueous glucose solution, then add it to the reactor for hydrothermal reaction, cool naturally after the reaction, centrifuge until the pH reaches 7, then dry, and calcinate the dried product to obtain solid carbon spheres;

[0038] S2. Disperse graphene oxide in deionized water, then add ascorbic acid and solid carbon spheres in sequence, wherein the mass ratio of graphene oxide: ascorbic acid: solid carbon spheres is 2:100:2, stir well and transfer to a high-pressure reactor , carry out hydrothermal reaction at 160°C, the reaction time is 6h, centrifuge and dry after the reaction;

[0039] S3. Calcining the dried product, under the protection of nitrogen, under the condition of 1-3°C / min temperature program, keep at 300-500°C for 1-2h, and t...

Embodiment 2

[0043] This embodiment provides a method for preparing a graphene / solid carbon sphere lithium-ion battery negative electrode material, comprising the following steps:

[0044] S1. preparing solid carbon spheres;

[0045] S11. Prepare an aqueous glucose solution, then add it to the reactor for hydrothermal reaction, cool naturally after the reaction, centrifuge until the pH reaches 7, then dry, and calcinate the dried product to obtain solid carbon spheres;

[0046] S2. Disperse graphene oxide into deionized water, then add ascorbic acid and solid carbon spheres in sequence, wherein the mass ratio of graphene oxide: ascorbic acid: solid carbon spheres is 15:40:2, stir evenly and transfer to a high-pressure reactor , carry out hydrothermal reaction at 200°C, the reaction time is 12h, centrifuge and dry after the reaction;

[0047] S3. Calcining the dried product, under the protection of nitrogen, under the condition of 1-3°C / min temperature program, keep at 300-500°C for 1-2h, ...

Embodiment 3

[0051] This embodiment provides a method for preparing a graphene / solid carbon sphere lithium-ion battery negative electrode material, comprising the following steps:

[0052] S1. preparing solid carbon spheres;

[0053] S11. Prepare an aqueous glucose solution, then add it to the reactor for hydrothermal reaction, cool naturally after the reaction, centrifuge until the pH reaches 7, then dry, and calcinate the dried product to obtain solid carbon spheres;

[0054] S2. Disperse graphene oxide in deionized water, then add ascorbic acid and solid carbon spheres in sequence, wherein the mass ratio of graphene oxide: ascorbic acid: solid carbon spheres is 15:40:1, stir well and transfer to a high-pressure reactor , carry out hydrothermal reaction at 240°C, the reaction time is 24h, centrifuge and dry after the reaction;

[0055] S3. Calcining the dried product, under the protection of nitrogen, under the condition of 1-3°C / min temperature program, keep at 300-500°C for 1-2h, and ...

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Abstract

The invention relates to the technical field of lithium ion negative electrode materials, and discloses a preparation method of a graphene / solid carbon sphere lithium ion negative electrode plate anda button lithium ion battery. According to the scheme of the invention, solid carbon spheres are introduced into a graphene material, the excellent conductive property of graphene is combined with thesolid carbon spheres rich in pore structures, the two generate a synergistic effect, on the one hand, graphene oxide and the solid carbon spheres may generate a polymerization reaction, and thus thesolid carbon spheres and graphene have a bonding effect, and a uniform graphene-solid carbon sphere composite structure can be formed, and on the other hand, the existence of the solid carbon spheresalso prevents the re-stacking of graphene plate layers and effectively reduces the aggregation of graphene. According to the scheme of the invention, through secondary heating calcination, the problemthat graphene that has been dispersed may be recombined into thicker graphite due to rapid heating can be avoided, and the phenomenon that the solid carbon spheres and graphene are compounded to generate the synergistic effect can be better facilitated.

Description

technical field [0001] The invention relates to the technical field of lithium ion negative electrode materials, and more specifically, to a graphene / solid carbon sphere lithium ion negative electrode sheet and a method for preparing a button lithium ion battery. Background technique [0002] Energy and materials are the most important material basis for supporting today's human civilization and ensuring social development. Lithium-ion batteries are widely used due to their high operating voltage, high specific energy, no memory effect, and no pollution to the environment. They are ideal power sources for small and lightweight electronic devices such as portable instruments, electric vehicles, and mobile phones. It has inspired a large number of researchers to research and explore lithium-ion anode materials. At present, the theoretical specific capacity of graphite materials is only 375mAh / g, which gradually cannot meet the application requirements of human society for batt...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/04H01M4/587H01M4/62H01M10/0525H01M10/058C01B32/05C01B32/184
CPCC01B2204/22H01M4/0471H01M4/1393H01M4/587H01M4/625H01M10/0525H01M10/058H01M2004/027Y02E60/10Y02P70/50
Inventor 林荣铨
Owner 株洲市智汇知识产权运营服务有限责任公司
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