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Lithium-sulfur battery cathode material and preparation method thereof

A technology for lithium-sulfur batteries and cathode active materials, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of volume expansion, poor conductivity, and low utilization rate of sulfur in cathode active materials, and achieve convenient operation and equipment Simple, the effect of improving electrochemical performance

Inactive Publication Date: 2020-10-13
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its commercial development is subject to many problems: the low utilization rate of sulfur in the positive electrode active material, poor conductivity, the dissolution shuttle effect and volume expansion of intermediate products in the electrochemical reaction process.

Method used

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  • Lithium-sulfur battery cathode material and preparation method thereof
  • Lithium-sulfur battery cathode material and preparation method thereof
  • Lithium-sulfur battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 0.275g of copper phthalocyanine and 0.225g of elemental sulfur were uniformly mixed in a mortar to obtain a compound. Put 1.5g of zirconia balls and the compound into a 5ml grinding tube, remove the air in the tube, and put it into a micro-vibration ball mill for ball milling. The rotating speed is 3000r / min, and the ball milling time is 1h.

Embodiment 2

[0017] 0.25g of copper phthalocyanine and 0.25g of elemental sulfur were uniformly mixed in a mortar to obtain a compound. Put 0.5g of zirconia grinding balls and the compound into a 5ml grinding jar, remove the air in the jar, and put it into a micro-vibration ball mill for ball milling. The rotating speed is 2000r / min, and the ball milling time is 2h.

Embodiment 3

[0019] 0.225g of copper phthalocyanine and 0.275g of elemental sulfur were uniformly mixed in a mortar to obtain a compound. Put 1g of zirconia grinding balls and the compound into a 5ml grinding jar, remove the air in the jar, and put it into a micro-vibration ball mill for ball milling. The rotating speed is 3000r / min, and the ball milling time is 0.5h.

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Abstract

The invention discloses a preparation method of a copper phthalocyanine-sulfur copolymer, which comprises the following steps: uniformly mixing copper phthalocyanine with elemental sulfur in a certainratio, and carrying out ball-milling reaction to obtain the copper phthalocyanine-sulfur copolymer. The method is simple and convenient and does not need other reagents. The copper phthalocyanine-sulfur copolymer prepared by the method is high in sulfur content, and an assembled battery has relatively good electrochemical performance.

Description

technical field [0001] The invention provides a positive electrode material that can be used in lithium-sulfur batteries and a preparation method thereof. Background technique [0002] As people rely more and more on portable power sources, efficient and economical energy storage technologies play an important role in the demand for green and sustainable energy. The theoretical specific capacity of lithium-sulfur battery is as high as 1675mAh / g, which is one of the most promising energy storage devices. However, in the process of commercial development, it is subject to many problems: low sulfur utilization rate of positive active material, poor conductivity, dissolution shuttling effect and volume expansion of intermediate products in the electrochemical reaction process. How to improve the conductivity of positive electrode materials and inhibit the dissolution of lithium polysulfides in the electrolyte has become the focus of research. In recent years, porous carbon mat...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/624H01M4/628H01M10/052Y02E60/10
Inventor 赵永男高海燕王淑霏
Owner TIANJIN POLYTECHNIC UNIV
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