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A cathode material for a lithium-sulfur battery

A positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of unfavorable battery high rate performance, very large volume change, unfavorable battery cycle application, etc., to improve the cycle Stability, avoiding direct contact, preventing other side effects

Active Publication Date: 2018-10-02
北京石墨烯技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are three main problems in the application of lithium-sulfur batteries: the lithium polysulfide compound, the reaction product of lithium and sulfur, dissolves in the electrolyte, which is not conducive to the cyclic application of the battery; the non-conductivity of sulfur is not conducive to the high rate performance of the battery; During the discharge process, the volume change is very large, which may cause battery damage

Method used

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  • A cathode material for a lithium-sulfur battery

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Embodiment 1

[0023] A lithium-sulfur battery positive electrode material, the material includes sulfur / graphene oxide / CNTs composite, the sulfur / graphene oxide / CNTs composite is coated with a conductive polymer layer, and the conductive polymer layer is coated with There is an adhesive layer.

[0024] The mass ratio of sulfur to graphene oxide in the sulfur / graphene oxide / CNTs composite is 4:1, and the mass ratio of sulfur to CNTs is 4:1; the conductive polymer material of the conductive polymer layer is polydopamine , the mass ratio of sulfur and polydopamine in the positive electrode material is 2:1; the binder of the binder layer is polyacrylic acid, and the mass ratio of sulfur and binder in the positive electrode material is 4:1.

Embodiment 2

[0026] A lithium-sulfur battery positive electrode material, the material includes sulfur / graphene oxide / CNTs composite, the sulfur / graphene oxide / CNTs composite is coated with a conductive polymer layer, and the conductive polymer layer is coated with There is an adhesive layer.

[0027] The mass ratio of sulfur to graphene oxide in the sulfur / graphene oxide / CNTs composite is 5:2, and the mass ratio of sulfur to CNTs is 4:1; the conductive polymer material of the conductive polymer layer is polydopamine , the mass ratio of sulfur and polydopamine in the positive electrode material is 2:1; the binder of the binder layer is polyacrylic acid, and the mass ratio of sulfur and binder in the positive electrode material is 4:1.

Embodiment 3

[0029] A lithium-sulfur battery positive electrode material, the material includes sulfur / graphene oxide / CNTs composite, the sulfur / graphene oxide / CNTs composite is coated with a conductive polymer layer, and the conductive polymer layer is coated with There is an adhesive layer.

[0030] The mass ratio of sulfur to graphene oxide in the sulfur / graphene oxide / CNTs composite is 3:1, and the mass ratio of sulfur to CNTs is 3:1; the conductive polymer material of the conductive polymer layer is polydopamine , the mass ratio of sulfur and polydopamine in the positive electrode material is 2:1; the binder of the binder layer is polyacrylic acid, and the mass ratio of sulfur and binder in the positive electrode material is 4:1.

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Abstract

The invention provides a lithium sulfur battery positive electrode material. The positive electrode material comprises a sulfur / graphene oxide / CNTs compound, the sulfur / graphene oxide / CNTs compound is coated with a conductive polymer layer, and the conductive polymer layer is coated with a binder layer. A large amount of functional groups on the surface of graphene oxide have a very good fixing effect on in situ generated sulfur simple substance, so the cycle stability of a battery is obviously improved; CNTs are compounded with graphene oxide, so the power density, the charge and discharge speed and the stability of the battery are increased; and the conductive polymer layer can improve the conductivity of the positive electrode material, and also can prevent degradation of an electrolyte and generation of other side reactions. The lithium sulfur battery positive electrode material has large electrode capacity and excellent cycle performances.

Description

technical field [0001] The invention relates to a battery material, in particular to a lithium-sulfur battery cathode material. Background technique [0002] Lithium-sulfur battery is a kind of lithium battery with sulfur element as the positive electrode and metal lithium as the negative electrode. Its specific capacity is as high as 1675mAh / g, which is much higher than the capacity of lithium cobalt oxide batteries (<150mAh / g) widely used in commerce. In theory, lithium-sulfur batteries of the same weight can provide electric vehicles with three times the battery life of ordinary lithium-ion batteries. In addition, sulfur is a non-polluting, environmentally friendly element, abundant in reserves, light in weight and cheap, and is a promising lithium battery material. [0003] The charging and discharging principle of lithium-sulfur battery is as follows: when discharging, the negative electrode reaction is that lithium loses electrons and becomes lithium ions, and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/624H01M4/625H01M10/052Y02E60/10
Inventor 燕绍九洪起虎杨程南文争戴圣龙
Owner 北京石墨烯技术研究院有限公司