Graphene lithium ion battery flexible positive thin-film and preparation method thereof

A technology of lithium-ion batteries and cathode thin films, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of insufficient flexibility of the cathode of lithium batteries, unsatisfactory adhesion of metal materials, and affecting battery charge and discharge performance. The effect of improving electrochemical performance, increasing the range of use, and reducing battery weight

Inactive Publication Date: 2019-06-14
天津艾克凯胜石墨烯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently used flexible batteries mainly use metal materials to prepare current collectors. However, metal current collectors reduce the flexibility of the pole piece, making the positive electrode of the lithium battery less flexible, and at the same time reducing the capacity density of the battery. Adhesion is not ideal, resulting in the easy peeling of the positive electrode material during high-rate charge and discharge, which in turn affects the charge and discharge performance of the battery

Method used

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  • Graphene lithium ion battery flexible positive thin-film and preparation method thereof
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  • Graphene lithium ion battery flexible positive thin-film and preparation method thereof

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preparation example Construction

[0028] A kind of preparation method of graphene lithium ion battery flexible cathode film of the present invention is characterized in that, its steps are:

[0029] Slowly dissolve the binder in deionized water, heat to 50°C, add active materials, conductive agents, and dispersants after the binder is dissolved, and ball mill to obtain a mixed material, and coat the mixed material evenly on the PTFE plate On the surface, a film is formed, and the polytetrafluoroethylene plate coated with the film is placed in an oven, and dried at a suitable temperature, and the graphene lithium ion battery flexible cathode film obtained after drying is obtained.

[0030] Preferably, the drying temperature of the oven is 50-60° C., and the drying time is 5-10 hours.

[0031] Preferably, the weight ratio of the deionized water to the binder is 1:0.01-1:0.1.

Embodiment 1

[0033] A kind of graphene lithium ion battery flexible cathode film, its raw material parts by weight are composed as follows:

[0034]

[0035]

[0036] The graphene is graphene prepared by CVD method with an average particle size of 5 μm.

[0037] The average molecular weight of the polyethylene oxide is 100,000.

[0038] Preparation method: Taking the preparation of graphene lithium ion battery flexible positive electrode film as an example, the preparation method of a graphene lithium ion battery flexible positive electrode film provided in this embodiment is described as follows:

[0039] Slowly dissolve 0.1 part of polyethylene oxide in 10 parts of deionized water, heat to 50°C, add 50 parts of lithium iron phosphate, 1 part of graphene, 0.1 part of polyvinylpyrrolidone after the polyethylene oxide is dissolved, and ball mill for 2 hours to obtain a mixed material , the mixed material is evenly coated on the surface of the polytetrafluoroethylene board to form a f...

Embodiment 2

[0041] A kind of graphene lithium ion battery flexible cathode film, its raw material parts by weight are composed as follows:

[0042]

[0043] The graphene is graphene prepared by CVD method with an average particle size of 5 μm.

[0044] The average molecular weight of the polyethylene oxide is 600,000.

[0045] Preparation method: Taking the preparation of graphene lithium ion battery flexible positive electrode film as an example, the preparation method of a graphene lithium ion battery flexible positive electrode film provided in this embodiment is described as follows:

[0046] Slowly dissolve 10 parts of polyethylene oxide in 100 parts of deionized water, heat to 50°C, add 98 parts of lithium iron phosphate, 40 parts of graphene, and 0.5 parts of polyvinylpyrrolidone after the polyethylene oxide is dissolved, and ball mill for 2 hours to obtain a mixed material , the mixed material is evenly coated on the surface of the polytetrafluoroethylene board to form a film,...

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Abstract

The invention provides a graphene lithium ion battery flexible positive thin-film and a preparation method thereof. The graphene lithium ion battery flexible positive thin-film is prepared from the following materials in parts by weight: 50-98 parts of active material, 1-40 parts of conductive agent, 0.1-0.5 part of dispersing agent, and 0.1-10 parts of adhesive; the preparation method comprises the following steps: slowly dissolving adhesive into deionized water, adding the active material, the conductive agent and the dispersing agent after dissolving; ball-milling to obtain the mixture, uniformly coating the mixture on a surface of a polyfluortetraethylene plate to form a thin-film; placing the polyfluortetraethylene plate coated with the thin-film in a drying oven, drying to obtain thegraphene lithium ion battery flexible positive thin-film. By taking the polyoxyethylene as the adhesive, the life and the security of the lithium battery are improved, the metal material is preventedfrom using as the current collector, and the technical problem that the lithium battery positive is bad in flexibility and insufficient in tenacity is solved; the prepared flexible positive thin-filmis good on tenacity, large in strength and low in pollution; the flexible positive thin-film can be distorted, folded and deformed without influencing the battery charging / discharging performance.

Description

technical field [0001] The invention relates to the technical field of flexible lithium-ion batteries, in particular to a graphene lithium-ion battery flexible cathode film and a preparation method thereof. Background technique [0002] Flexible batteries, as the name implies, are batteries that can be bent and used repeatedly. Wearable smart devices are one of the important symbols of future scientific and social progress, and are a major strategic demand of the country, and their long-term endurance depends on high-performance flexible energy storage batteries. Therefore, high-performance flexible batteries are urgently needed to be developed. Currently used flexible batteries mainly use metal materials to prepare current collectors. However, metal current collectors reduce the flexibility of the pole piece, making the positive electrode of lithium batteries less flexible, and at the same time reducing the capacity density of the battery. The adhesion is not ideal, which ...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/1397H01M4/58H01M4/62H01M10/0525
CPCY02E60/10
Inventor 王立伟燕绍九
Owner 天津艾克凯胜石墨烯科技有限公司
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