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A kind of cathode material for lithium-sulfur battery and lithium-sulfur battery cathode

A technology for lithium-sulfur batteries and cathode materials, applied in the field of cathode materials for lithium-sulfur batteries and cathodes for lithium-sulfur batteries, can solve the problems of poor electronic conductivity and ion conductivity of elemental sulfur, poor cycle performance of lithium-sulfur batteries, and easy shuttle effect, etc. problems, achieve the effects of controllable fiber characteristics, rich material types, and mitigation of concentrated heat release and overheating

Active Publication Date: 2016-06-22
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

[0006] In order to solve the problem that lithium polysulfide, an intermediate product produced during the charging and discharging process of lithium-sulfur battery, is easily soluble in organic electrolyte, prone to shuttle effect, volume expansion of sulfur electrode, and poor electronic conductivity and ion conductivity of elemental sulfur, resulting in lithium-sulfur battery For the problem of poor cycle performance, the present invention proposes a positive electrode material for lithium-sulfur batteries

Method used

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  • A kind of cathode material for lithium-sulfur battery and lithium-sulfur battery cathode
  • A kind of cathode material for lithium-sulfur battery and lithium-sulfur battery cathode

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Effect test

Embodiment 1

[0036] a Cut the aluminum foil, immerse it in oxalic acid solution with a concentration of 5wt%, take it out after 4 hours, dry it at 70°C, wipe the surface of the metal foil with an absolute ethanol cotton ball, and dry it;

[0037] b Preparation of graphene-doped mesoporous carbon hollow nanofibers: Graphene-doped hollow nanofibers were prepared by coaxial electrospinning technology, and then the prepared hollow nanofibers were heat-treated to obtain mesoporous carbon hollow nanofibers ;

[0038] c Nanofiber vulcanization: The prepared mesoporous carbon hollow nanofibers and elemental sulfur were placed at both ends of the glass tube respectively, and then the glass tube was placed in a tube furnace, passed through nitrogen, and heated at 500 ° C for 2 hours, Sulfur vapor diffuses and adsorbs in mesoporous carbon hollow nanofibers.

[0039]d (4) Preparation of slurry: The prepared sulfur-nanofiber composite material, polyvinylidene fluoride (PVDF), and N-methyl-2-pyrrolidon...

Embodiment 2

[0045] a Cut the aluminum foil, immerse it in oxalic acid solution with a concentration of 5wt%, take it out after 4 hours, dry it at 70°C, wipe the surface of the metal foil with an absolute ethanol cotton ball, and dry it;

[0046] b Preparation of graphene-doped mesoporous carbon hollow nanofibers: Graphene-doped hollow nanofibers were prepared by coaxial electrospinning technology, and then the prepared hollow nanofibers were heat-treated to obtain mesoporous carbon hollow nanofibers ;

[0047] c Nanofiber vulcanization: The prepared mesoporous carbon hollow nanofibers and elemental sulfur were placed at both ends of the glass tube respectively, then the glass tube was put into a tube furnace, nitrogen was introduced, and heated at 500 ° C for 2 hours, Sulfur vapor diffuses and adsorbs in mesoporous carbon hollow nanofibers.

[0048] d (4) Preparation of slurry: The prepared sulfur-nanofiber composite material, polyvinylidene fluoride (PVDF), and N-methyl-2-pyrrolidone (N...

Embodiment 3

[0054] a Cut the aluminum foil, immerse it in oxalic acid solution with a concentration of 5wt%, take it out after 4 hours, dry it at 70°C, wipe the surface of the metal foil with an absolute ethanol cotton ball, and dry it;

[0055] b Preparation of graphene-doped mesoporous carbon hollow nanofibers: Graphene-doped hollow nanofibers were prepared by coaxial electrospinning technology, and then the prepared hollow nanofibers were heat-treated to obtain mesoporous carbon hollow nanofibers ;

[0056] c Nanofiber vulcanization: The prepared mesoporous carbon hollow nanofibers and elemental sulfur were placed at both ends of the glass tube respectively, then the glass tube was put into a tube furnace, nitrogen was introduced, and heated at 500 ° C for 2 hours, Sulfur vapor diffuses and adsorbs in mesoporous carbon hollow nanofibers.

[0057] d Preparation of slurry: The prepared sulfur-nanofiber composite material, polyvinylidene fluoride (PVDF), and N-methyl-2-pyrrolidone (NMP) ...

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Abstract

The invention relates to a positive electrode material for a lithium sulfur battery. The positive electrode material is a graphene doped porous hollow fiber, and the doping amount of graphene is 0.005-0.2% of the total mass of the positive electrode material; the porous hollow fiber is a porous hollow tubular structure, the external diameter of the tube is 80-1000nm, the internal diameter of the tube is 30-400nm, and the aperture of pores on the sidewall of the tube is 2-80nm; and graphene is embedded into the sidewall of the porous hollow fiber tube. A battery assembled by adopting a positive electrode made by using the positive electrode material has high discharge specific capacity and good cycle stability.

Description

technical field [0001] The invention relates to a lithium-sulfur battery, in particular to a positive electrode material for a lithium-sulfur battery and a positive electrode of the lithium-sulfur battery. Background technique [0002] Nowadays, the problems of environmental pollution, greenhouse effect and energy crisis in the world are becoming more and more serious. Secondary batteries with high specific energy are of great significance for solving prominent energy and environmental problems. Among them, lithium ion battery is one of the batteries with the highest specific energy among secondary batteries. However, in the lithium-ion secondary battery system, the specific capacity and cycle performance of the cathode material need to be further optimized. Traditional cathode materials such as LiCoO 2 / Graphite and LiFePO 4 The theoretical energy densities of the graphite / graphite systems are all about 400Wh / kg. Due to the limitation of its theoretical energy density,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/136H01M4/62H01M4/66H01M4/75H01M4/1393H01M4/1397B82Y40/00D01D5/00
CPCH01M4/133H01M4/583H01M4/622H01M10/052Y02E60/10
Inventor 马艺文张华民张益宁王美日王倩周伟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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