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Lithium sulphur battery anode piece added with absorbent and lithium sulphur battery

A positive pole piece, lithium-sulfur battery technology, applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of cycle performance degradation, battery capacity attenuation, etc.

Inactive Publication Date: 2011-09-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the problem that polysulfides, the intermediate products of lithium-sulfur batteries, are easy to dissolve in the electrolyte and diffuse to the negative electrode with the electrolyte, resulting in battery capacity attenuation and cycle performance degradation, etc., the present invention adds an adsorbent to the positive electrode sheet of the lithium-sulfur battery. The amount of additive added is more than 5% of the mass of the positive pole piece

Method used

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  • Lithium sulphur battery anode piece added with absorbent and lithium sulphur battery
  • Lithium sulphur battery anode piece added with absorbent and lithium sulphur battery
  • Lithium sulphur battery anode piece added with absorbent and lithium sulphur battery

Examples

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Embodiment 1

[0024] The selected specific surface area is 1000m 2 The active carbon of / g is made adsorbent, and adsorbent accounts for 15% by mass percentage in positive electrode material, and positive electrode active material is carbon nanotube and sulfur composite material, and acetylene black is made conductive agent, and the PVDF (polyvinylidene fluoride) of 5wt% The solution (the solvent is NMP, N-methylpyrrolidone) is used as a binder to prepare the positive electrode slurry; then the slurry is coated on the foamed nickel to prepare a positive electrode sheet, and dried to obtain the required positive electrode sheet, the positive electrode The thickness of the pole piece is 45-55um. Select Celgard2400 film as the battery diaphragm to assemble the battery, the electrolyte is 1mol / L LiPF6 / EC:DMC:EMC (1:1:1 volume ratio, EC: ethylene carbonate, DMC: dimethyl carbonate, EMC: carbonic acid methyl ethyl ester), and the entire battery assembly process was completed in a glove box.

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Embodiment 2

[0027] Activated carbon and sulfur composite materials are selected as the positive electrode active material, and porous carbon microspheres are used as the adsorbent material to prepare the positive electrode sheet. The conductive agent is superconducting carbon black BP2000, and the mass ratio of the positive electrode active material, conductive agent, binder and adsorbent is 60%: 15%: 15%: 10%. Prepare the positive electrode sheet and assemble the battery by the same method as in Example 1. The battery charge and discharge test results show that the first charge and discharge specific capacity of the material is 867.4mAh / g, and the specific capacity after 50 cycles is also maintained at 535.6mAh / g. Good battery performance was shown.

Embodiment 3

[0029]A composite material of carbide-derived carbon and sulfur (wherein the pore size distribution of carbide-derived carbon is 0.5-5nm) is selected as the positive electrode active material, and mesoporous carbon is used as the adsorbent material to prepare the positive electrode sheet, wherein the positive electrode active material, conductive agent, binder The mass ratio of agent and adsorbent is 75%:10%:10%:5%. The same method as in Example 1 was used to prepare the positive electrode sheet and assemble the battery. The charge-discharge test results show that the initial charge-discharge specific capacity of the material is 924.1mAh / g, and the specific capacity remains at 607.9mAh / g after 50 cycles, showing good battery performance.

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Abstract

The invention relates to a lithium sulphur battery anode piece added with an absorbent and a lithium sulphur battery. In the invention, a material which has the characteristics of high specific surface area and strong absorption performance is used as the absorbent; the absorbent is added into the anode piece of the lithium sulphur battery; and the addition amount of the absorbent is more than 5% of the mass of the anode piece. The added absorbent can absorb the polysulfide of the lithium sulphur battery in the charge and discharge courses, thereby avoiding the polysulfide from being absorbed on the surface of a sulfhydryl composite material to reduce the electrical conductivity, and can simultaneously prevent the polysulfide from being scattered on the surface of the cathode and generating a corrosion reaction with lithium to further cause the irreversible capacity loss of the battery. Thus, the added absorbent can be used for improving the performance of the lithium sulphur battery provided by the invention.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a lithium-sulfur battery positive pole piece and a lithium-sulfur battery added with an adsorbent. technical background [0002] Cathode materials have always been the bottleneck restricting the development of lithium batteries. The current commercial lithium battery active materials are mainly LiCoO 2 , LiMnO 4 Wait. Compared with the negative electrode, the specific capacity of commercial positive electrode materials is too low, LiCoO 2 The specific capacity is 130~140mAh / g, LiMnO 4 The specific capacity of lithium batteries is 110-130mAh / g, and they are expensive. Therefore, it is particularly critical and urgent to develop new green energy storage cathode materials with high energy density, low cost and long cycle life. [0003] As a cathode material, elemental sulfur has the advantages of high specific capacity, low price, and low toxicity. The theoret...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/62H01M10/052
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 木士春陈伟
Owner WUHAN UNIV OF TECH
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