A kind of positive electrode material of lithium-sulfur battery and preparation method thereof

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 low utilization rate of electrode active materials, poor battery cycle performance, poor cycle stability, etc., to achieve enhanced electrochemical performance, improvement of adsorption energy, and enhancement of electrical conductivity
CN109802104BActive Publication Date: 2020-12-11INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
Publication Date
2020-12-11

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery cathode material and a preparation method thereof. The material is a composite material formed of nitrogen-doped carbon nanofiber-carbonized covalent organic framework material and pure-phase nano-sulfur powder. Nitrogen-doped carbon nanofiber-carbonized covalent organic framework materials are applied to lithium-sulfur batteries. The resulting positive electrode material improves the cycle performance of lithium-sulfur batteries. Its high specific surface area and porous structure adsorb lithium polysulfide, an intermediate product of the electrode reaction, It plays the role of sulfur fixation; at the same time, the conductivity of the material is also improved.
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Description

technical field

[0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery cathode material and a preparation method thereof. Background technique

[0002] Lithium-ion batteries are considered to be one of the batteries with the most potential for development in the new century because of their high voltage, high energy density, safety, and reliability. The performance of lithium-ion batteries largely depends on the reversible lithium-extraction / intercalation capacity of the battery material. The cathode material is the bottleneck hindering the development of high-capacity lithium-ion batteries, and the cathode material is also an important factor in determining the safety performance of the battery. The current mainstream cathode materials for lithium-ion secondary batteries include lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphate. Although mainstream cathode materials have ...

Claims

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