Composite anode material for lithium sulfur battery, preparation method and application thereof

A composite cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve the problems of poor cycle performance of sulfur batteries, and achieve the effect of uniform size and good electrochemical cycle stability

Inactive Publication Date: 2012-01-11
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a composite positive electrode material for lithium-sulfur batteries to solve the problems of poor batt

Method used

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  • Composite anode material for lithium sulfur battery, preparation method and application thereof
  • Composite anode material for lithium sulfur battery, preparation method and application thereof
  • Composite anode material for lithium sulfur battery, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] First, sulfur and polypyrrole were vacuum-dried at 50 °C for 10 h, respectively. Sulfur and polypyrrole were mixed evenly in a mass ratio of 2:1, then vacuum-sealed in a glass container, then kept at 150°C for 4 hours, and cooled naturally to obtain a sulfur-polypyrrole composite material (SPT1 ). The electrode preparation method, battery assembly, and test conditions are the same as in Comparative Example 1. The test results are shown in Table 1.

Embodiment 2

[0038] The drying of raw material is as embodiment 1. Mix sulfur and polypyrrole at a mass ratio of 1:1 and obtain a sulfur-polypyrrole composite material (SPT2) with a sulfur content of 40% according to the method of Example 1. The electrode preparation method, battery assembly, and test conditions are the same as in Comparative Example 1. The test results are shown in Table 1. From the data in Table 1, it can be seen that the cycle performance of the composite electrode has been greatly improved compared with the pure sulfur electrode.

Embodiment 3

[0040] The drying of raw material is as embodiment 1. Melt sulfur completely at 140°C, rapidly cool it in air or water, then dissolve it in CS 2 After filtration, a filtrate containing 10% sulfur was obtained. Immerse an appropriate amount of polypyrrole nanotubes into the above sulfur CS 2 The solution was stirred for 10 minutes and then left to stand for 20 minutes, and then the filtered product was vacuum-dried at 50° C. to obtain a sulfur-polypyrrole composite material (SPI1) with a sulfur content of 15%. The electrode preparation method, battery assembly, and test conditions are the same as in Comparative Example 1. The test results are shown in Table 1.

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Abstract

The invention relates to a high-performance sulfur and set-appearance conductive polymer composite anode material for the anode of a lithium sulfur battery and a preparation technique thereof, belonging to the field of chemical power supplies. The composite anode material for the lithium sulfur battery provided by the invention is a sulfur and conductive polymer nanotube composite anode material. The sulfur is dispersed and absorbed on the surface of the conductive polymer nanotube and in the conductive polymer nanotube to form a hollow fibrous structure. The invention uses high-conductivity polymers with good adsorbability to the sulfur and the reduced product thereof as a conductive phase in a sulfur electrode, uses a co-heating method and a liquid sulfur infiltration method to enable the polymers to be evenly combined with the sulfur to obtain a composite electrode material, and solves the problems that the sulfur electrode and the reduced product thereof in the lithium sulfur battery are apt to be dissolved in organic electrolytes, the battery circulation performance is poor because of the non-conductivity of the sulfur and the like. The sixtieth cycling capacity of the composite material is larger than 650mAh/g and the electrochemical cycling stability is good.

Description

technical field [0001] The invention relates to a composite positive electrode material for a lithium-sulfur battery, in particular to a sulfur-polymer composite material used as a positive electrode of a lithium-sulfur battery, a preparation method and application thereof, and belongs to the field of chemical power sources. Background technique [0002] At present, with the development of various multifunctional portable electronic products, electric vehicles, and energy storage fields, the demand for reversible secondary batteries used is increasing. Therefore, the development of reversible secondary batteries with high specific energy has become a research hotspot. In particular, high specific energy lithium batteries using lithium metal as electrodes have attracted widespread attention. One of its main limiting factors is the application of high specific capacity cathodes. Lithium-sulfur secondary batteries using sulfur-based cathode materials have the advantages of hig...

Claims

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Application Information

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IPC IPC(8): H01M4/137H01M4/1399H01M10/052
CPCY02E60/122Y02E60/10
Inventor 刘宇梁宵温兆银黄乐之黄颖
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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