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A kind of manufacturing method of positive electrode of lithium-sulfur battery

A manufacturing method and lithium-sulfur battery technology, applied in battery electrodes, positive electrodes, active material electrodes, etc., can solve the problems of poor electrical conductivity of elemental sulfur, achieve a large reactive surface, improve electrochemical performance, reduce impedance and polarity degree of effect

Active Publication Date: 2017-02-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The positive electrode active material of lithium-sulfur battery is sulfur element, but due to the poor conductivity of elemental sulfur, carbon materials with porous or large specific surface (such as mesoporous carbon, carbon nanofiber, carbon nanotube, expanded graphite and graphene etc.) as a conductive agent and elemental sulfur to synthesize carbon-sulfur complexes by high-temperature liquid phase or gas phase method

Method used

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  • A kind of manufacturing method of positive electrode of lithium-sulfur battery
  • A kind of manufacturing method of positive electrode of lithium-sulfur battery
  • A kind of manufacturing method of positive electrode of lithium-sulfur battery

Examples

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Effect test

Embodiment 1

[0045] 1) Collector treatment

[0046] Put the aluminum foil (20μm) used as the positive electrode collector of the lithium-sulfur battery into 5% oxalic acid solution, corrode for 1min, take it out and immerse it in deionized water, ultrasonic for 10s, and air dry for later use;

[0047] Mix water and ethanol at a volume ratio of 1:9 to prepare a mixed solution, mix superP and AB at a mass ratio of 1:1 and dissolve in the mixed solution of water and ethanol, with a mass fraction of 0.5%, ultrasonication for 20 minutes; select PTFE with a solid content of 60% Emulsion, according to the mass ratio of carbon material: PTFE (solid) 80%: 20%, add PTFE emulsion, mix thoroughly, ultrasonic 30min, wait until the mixture is uniform, and set aside;

[0048] Spread the treated aluminum foil on an 80°C heating plate, and spray the ultrasonically uniform mixture onto one or both sides of the aluminum foil, with the carbon material loading controlled at 0.2mg / cm 2 , dried, and rolled by a...

Embodiment 2

[0057] 1) Collector treatment

[0058] Put the aluminum foil (20μm) used as the positive electrode collector of the lithium-sulfur battery into a 5% oxalic acid solution, corrode for 1min, take it out, immerse it in deionized water, ultrasonicate for 10s, and air-dry it for later use;

[0059] Mix water and ethanol at a volume ratio of 1:9 to prepare a mixed solution, mix superP and AB at a mass ratio of 1:1 and dissolve in the mixed solution of water and ethanol, with a mass fraction of 0.5%, ultrasonication for 20 minutes; select PTFE with a solid content of 60% Emulsion, according to the mass ratio of carbon material: PTFE (solid) 80%: 20%, add PTFE emulsion, mix thoroughly, ultrasonic 30min, wait until the mixture is uniform, and set aside;

[0060] Spread the treated aluminum foil on an 80°C heating plate, and spray the ultrasonically uniform mixture onto one or both sides of the aluminum foil, with the carbon material loading controlled at 0.2mg / cm 2 , dried, and rolled...

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Abstract

The invention relates to a method for making the positive electrode of a lithium-sulfur battery. First, carbon materials are loaded on one or both sides of the metal aluminum foil of the positive electrode current collector; carbon-sulfur composites, PTFE and carbon materials are mixed, or carbon-sulfur composites are mixed mixed with PTFE to make a flexible electrode; a flexible electrode is pasted on one or both sides of the positive electrode current collector loaded with carbon materials to make a positive electrode body; finally, a layer of polymer is coated on the surface of the positive electrode body with a flexible electrode. prepared from thin films. The invention combines the characteristics of the lithium-sulfur battery itself, improves the structure of the positive electrode of the battery, and effectively improves its electrochemical performance.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, in particular to a method for preparing a positive electrode of a lithium-sulfur battery. Background technique [0002] With the rapid development of modern science and technology, the demand for energy is also increasing day by day. Traditional energy sources are gradually exhausted. Although new energy sources pay more attention to environmental friendliness, they all have shortcomings that cannot be ignored, such as wind power and solar energy. Therefore, chemical energy storage has highlighted its importance. Lithium-sulfur batteries have become a recent research hotspot due to their high energy density and low material cost. [0003] The positive electrode active material of lithium-sulfur battery is sulfur element, but due to the poor conductivity of elemental sulfur, carbon materials with porous or large specific surface (such as mesoporous carbon, carbon nanofiber, carbon nanotube...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/139
CPCH01M4/139H01M4/366H01M4/628H01M2004/028Y02E60/10
Inventor 王倩张华民张益宁王美日曲超马艺文吴宝山
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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