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Lithium-sulfur battery

A lithium-sulfur battery and sulfur-activated technology, applied in the field of electrochemical batteries, can solve the problems of low ion conductivity and electrical conductivity, difficulty in large-scale production, poor cycle performance, etc., achieve simple production process, low cost, and improve battery performance Effect

Inactive Publication Date: 2016-04-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]Technical problem to be solved: This application provides a lithium-sulfur battery, which solves the problem of shuttling reaction in the existing lithium-sulfur battery, and the dissolution of polysulfide ions in the ether electrolyte causes circulation Technical problems such as poor performance, complicated process, high cost, difficulty in large-scale production, and limited by low ionic conductivity and electrical conductivity at room temperature

Method used

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Examples

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Effect test

Embodiment 1

[0034] Such as figure 2As shown, a lithium-sulfur battery consists of a positive electrode material coated on a current collector, a separator, a separator, an electrolyte, and a negative electrode material. The positive electrode material is composed of a carbon / sulfur active material, a conductive agent, and a binder. , the carbon / sulfur active material is a composite of sulfur-containing active material and carbon material, wherein the carbon material is activated carbon with a sulfur content of 70%; the conductive agent is acetylene black, the binder is polyvinylidene fluoride, and the carbon / sulfur active The material, conductive agent and binder are mixed in a mass ratio of 7:2:1, with N-methyl-2-pyrrolidone as the solvent, stirred evenly, coated on the aluminum foil of the current collector, and then placed in a vacuum oven at 60°C After drying for 12 hours, the solvent was evaporated to make the positive electrode material.

[0035] The negative electrode material is...

Embodiment 2

[0038] Such as image 3 As shown, a lithium-sulfur battery consists of a positive electrode material coated on a current collector, a separator, a separator, an electrolyte, and a negative electrode material. The positive electrode material is composed of a carbon / sulfur active material, a conductive agent, and a binder. , the carbon / sulfur active material is a composite of sulfur-containing active material and carbon material, wherein the carbon material is activated carbon with a sulfur content of 70%; the conductive agent is acetylene black, the binder is polyvinylidene fluoride, and the carbon / sulfur active The material, conductive agent and binder are mixed in a mass ratio of 7:2:1, with N-methyl-2-pyrrolidone as the solvent, stirred evenly, coated on the aluminum foil of the current collector, and then placed in a vacuum oven at 60°C After drying for 12 hours, the solvent was evaporated to make the positive electrode material.

[0039] The negative electrode material is...

Embodiment 3

[0042] A lithium-sulfur battery is composed of a positive electrode material coated on a current collector, a separator, an interlayer, an electrolyte and a negative electrode material. The positive electrode material is composed of a carbon / sulfur active material, a conductive agent and a binder, and the carbon / sulfur The sulfur active material is a compound of sulfur-containing active material and carbon material, wherein the carbon material is activated carbon with a sulfur content of 70%; the conductive agent is acetylene black, and the binder is polyvinylidene fluoride. The carbon / sulfur active material, conductive Mix the agent and the binder at a mass ratio of 7:2:1, use N-methyl-2-pyrrolidone as a solvent, stir evenly, and coat it on the aluminum foil of the current collector, and then dry it in a vacuum oven at 60°C for 12 hours. The solvent was evaporated to make a positive electrode material.

[0043] The negative electrode material is metal lithium sheet, the diaph...

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Abstract

The invention discloses a lithium-sulfur battery. The lithium-sulfur battery is composed of a positive electrode material coating a current collector, a diaphragm, an interlayer, an electrolyte and a negative electrode material, wherein the positive electrode material is composed of a carbon / sulfur active material, a conductive agent and a binder; the diaphragm is a polypropylene diaphragm; the interlayer is a carbon nano tube paper or a carbon nano tube paper acidized by nitric acid; and the negative electrode material is a metallic lithium piece. When a current density is 0.5C(1C=1675mA.g<-1>), a first specific discharge capacity is 1039.9 mAh.g<-1>; after circulating 50 circles, the specific discharge capacity is 674.1 mAh.g<-1>, and an attenuation rate is only 0.1%.

Description

technical field [0001] The present application relates to the technical field of electrochemical batteries, in particular to a lithium-sulfur battery. Background technique [0002] With the increasing development of electronic technology, limited by the lower theoretical specific capacity of lithium-ion batteries, it is difficult to increase their energy density and meet the growing demand. The market needs a new type of secondary battery with high energy density. Lithium-sulfur batteries use sulfur as the positive electrode and metallic lithium as the negative electrode. Its high theoretical specific capacity (1675mAh g -1 ) is derived from the breaking and recombination of the S—S bond in the cyclic sulfur octamolecule during its charge and discharge process, including multiple redox reactions between elemental sulfur and lithium ions. The theoretical specific energy density of lithium-sulfur batteries is as high as 2600Wh kg -1 , the energy density in actual producti...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/38H01M10/052H01M10/058H01M4/62H01M2/16H01M50/409
CPCH01M4/362H01M4/583H01M4/622H01M4/623H01M4/625H01M10/052H01M10/058H01M50/409Y02E60/10Y02P70/50
Inventor 张校刚徐桂银潘瑾丁兵
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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