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Lithium-sulfur battery structure

A sulfur battery and lithium negative electrode technology, applied in the field of lithium-sulfur battery structure, can solve the problems of high implementation cost, unfavorable commercial promotion and application of batteries, complicated process, etc., and achieve the effect of protecting the negative electrode

Active Publication Date: 2015-06-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these measures are often complicated in process and high in implementation cost, which is not conducive to the commercialization and application of batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Blend 100mg KB600 carbon powder with polytetrafluoroethylene emulsion (PTFE, 5% mass fraction) in ethanol to obtain electrode slurry, wherein the mass ratio of carbon powder to polytetrafluoroethylene is 4:1, solid matter The ratio of the solvent to the solvent is 20 mg solid / ml solvent; the flake carbon layer is prepared by rolling, and dried at 60 degrees Celsius. The surface density of the carbon material in the carbon layer is 0.5 mg / cm 2 .

[0041] Mix sulfur and Super P carbon powder in a ball mill tank with a mass ratio of 3:1, and then keep it in an argon-protected tube furnace at 155 degrees Celsius for 2 hours to liquefy the elemental sulfur and enter the pores constructed by the carbon powder , the carbon-sulfur composite electrode material was obtained. Further, using it as the positive electrode material and PTFE as the binder, the mass ratio of the two is 9:1, and the same process as above is used to prepare the positive electrode for lithium-sulfur batte...

Embodiment 2

[0044] Blend 100mg of SuperP carbon powder with polytetrafluoroethylene emulsion (PTFE, 5% mass fraction) in ethanol to obtain electrode slurry, wherein the mass ratio of carbon powder to polytetrafluoroethylene is 4:1, solid matter The ratio of the solvent to the solvent is 20 mg solid / ml solvent; the flake carbon layer is prepared by rolling, and dried at 60 degrees Celsius. The surface density of the carbon material in the carbon layer is 0.5 mg / cm 2 .

[0045] Lithium sheet is used as the negative electrode, porous polypropylene diaphragm, 1M LiTFSi / TEGDME electrolyte, and the above carbon layer are used to assemble the lithium-air battery, in a pure oxygen atmosphere of 1.2 atmospheres, using 50mA / g (based on the quality of the carbon material) Discharge at a current density of 1 V, and the cut-off voltage is 1V. The discharged positive electrode is cleaned with ethylene glycol dimethyl ether to remove the electrolyte therein, and a conductive porous functional layer cont...

Embodiment 3

[0049] Blend 100mg of SuperP carbon powder with polytetrafluoroethylene emulsion (PTFE, 5% mass fraction) in ethanol to obtain electrode slurry, wherein the mass ratio of carbon powder to polytetrafluoroethylene is 4:1, solid matter The ratio of the solvent to the solvent is 20 mg solid / ml solvent; the flake carbon layer is prepared by rolling, and dried at 60 degrees Celsius. The surface density of the carbon material in the carbon layer is 0.5 mg / cm 2 .

[0050] The above electrode was placed in an aniline aqueous solution with a concentration of 1M hydrochloric acid and 1M ammonium sulfate, wherein the mass fraction of aniline was 10%, and stirred for 2 hours to obtain a polyaniline-modified functional layer. Stir and wash in deionized water to remove impurity ions, dry in a vacuum oven at 60 degrees Celsius, and use it as a conductive porous functional layer.

[0051] The carbon-sulfur composite positive electrode was prepared by the same process as in Example 1.

[0052...

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Abstract

The invention relates to a lithium-sulfur battery structure, including a lithium negative electrode, a porous diaphragm and a sulfur positive electrode which are sequentially laminated, an electrically conductive porous function layer is arranged between the lithium negative electrode and the porous diaphragm, the electrically conductive porous function layer is an electrically conductive porous carbon material layer or a composite layer of an electrically conductive porous carbon material and other functional components, and the mass ratio of electrically conductive porous carbon material to other functional components is 10:1 to 1:10; the conductive porous functional layer can effectively prevent polysulfides dispersed and migrated from the positive electrode in the charging and discharging process, inhibits the reaction between the lithium negative electrode and the conductive porous functional layer, and facilitates to greatly improve the battery cycle stability.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery structure. Background technique [0002] With the rapid development of electronics, communication equipment and electric vehicles, people put forward higher requirements for battery performance. Lithium-sulfur battery is a secondary battery that uses metallic lithium as the negative electrode and sulfur as the positive electrode active material. Metal lithium as the negative electrode material has the lowest theoretical voltage, and its theoretical specific capacity is as high as 3,862mAh / g, and the specific capacity of sulfur as the positive electrode active material is also as high as 1,672mAh / g. Therefore, lithium-sulfur batteries have extremely high specific energy. Taking lithium as the standard, its theoretical value can reach 2,600Wh / kg, and the actual specific energy is much higher than that of lithium-ion batteries. The highe...

Claims

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Application Information

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IPC IPC(8): H01M10/052H01M10/058
CPCY02E60/10Y02P70/50
Inventor 张益宁张华民王美日马艺文
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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