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Method for preparing lithium sulfur battery anode material

A positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of incomprehensible structure and morphology of composite materials, low volume expansion, and inability to avoid loading capacity well, so as to achieve inhibition Shuttle effect, improved stability, increased conductive activity and mechanical strength

Active Publication Date: 2019-02-15
ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as Chinese patent application (publication number: CN1396202A) has proposed a kind of elemental sulfur / conductive polymer composite material and method, and this method just simply compound elemental sulfur and conductive polymer, can not construct the structure and form the composite material of porous shape Morphology, cannot well avoid the phenomenon of low loading capacity and volume expansion

Method used

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  • Method for preparing lithium sulfur battery anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Dissolve a certain amount of sodium dodecyl sulfonate in deionized water, stir and mix uniformly to form a 0.1M microemulsion system, and then add 10% hydrochloric acid to adjust the pH of the system to 4 to make the system It is acidic and set aside.

[0027] Take 50mL of the above microemulsion, add 0.02moL of aniline monomer and 0.17g of silver nitrate to stir and ultrasonically disperse uniformly, and then slowly drop the oxidant ammonium persulfate solution under stirring (to make the aniline and ammonium persulfate The molar ratio is 1:1) and slowly add excess aluminum powder at the same time. After the dripping is completed, the reaction is stirred for 12h. During the whole reaction process, the reaction temperature of the system is controlled to 0~5℃, and the corresponding solid mixture is obtained by suction filtration. The solid mixture is slowly added with a 10% mass concentration of dilute nitric acid aqueous solution to wash until the filtrate is neutral, and ...

Embodiment 2

[0033] Dissolve a certain amount of sulfated sodium ricinole in deionized water, stir and mix uniformly to form a 0.2M microemulsion system, and then add 20% hydrochloric acid by mass to adjust the pH of the system to 1, so that the system becomes Acidic, spare.

[0034] Take 50mL of the above microemulsion, add 0.01moL of pyrrole monomer and 0.08g of silver nitrate to stir and ultrasonically disperse uniformly, and then slowly drop the oxidant ferric chloride solution under stirring (to make the pyrrole and ferric chloride The molar ratio is 1:1) and slowly add excess aluminum powder at the same time. After the dripping is completed, the reaction is stirred for 12h. The reaction temperature of the system is controlled to 5-10°C during the entire reaction process, and the corresponding solid mixture is obtained by suction filtration. Slowly add 15% dilute nitric acid by mass to the solid mixture until the filtrate is neutral, and finally use a large amount of deionized water and ...

Embodiment 3

[0040] Dissolve a certain amount of sodium p-methoxy fatty acid amide benzene sulfonate in deionized water, stir and mix uniformly to form a 1.0M microemulsion system, and then add 20% tartaric acid to adjust the pH of the system to 6.5, make the system weakly acidic, ready for use.

[0041] Take 50mL of the above microemulsion, and add 0.02moL of 3,4-ethylenedioxythiophene monomer and 0.2g of copper nitrate to stir and ultrasonically disperse uniformly, then slowly add the oxidant iron p-toluenesulfonate under stirring. Solution (make the molar ratio of 3,4-ethylenedioxythiophene to iron p-toluenesulfonate 1:0.5) and slowly add excess iron powder at the same time. After the addition is complete, stir and react for 12h, and control the system during the entire reaction process The reaction temperature is 0~6℃, the corresponding solid mixture is obtained by suction filtration, and then diluted hydrochloric acid is slowly added to the solid mixture to wash until the filtrate is neu...

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Abstract

The invention relates to a method for preparing a lithium sulfur battery anode material and belongs to the technical field of battery materials. Aiming to solve conventional phenomena of low loading capacities and volume expansion, the invention provides the method for preparing the lithium sulfur battery anode material. The method comprises the following steps: putting an anionic surfactant intoa solvent so as to obtain a micro emulsion, and adding an acid reagent to adjust the pH value till acidity; putting a conductive polymer monomer and a metallic salt into the micro emulsion, adding anoxidant and excessive metal powder to implement a reaction, after the reaction is completed, filtering and collecting a solid mixture, and washing so as to obtain a corresponding conductive metal / conductive polymer composite material; mixing the conductive metal / conductive polymer composite material with single sulfur, and carrying out high-temperature sintering treatment, thereby obtaining a corresponding sulfur anode composite material. By adopting the method, the loading capacity of a metal on a porous conductive polymer can be increased, the framework support capability and the conductivity of the composite material can be increased, and the composite material has high stability and battery circulation performance.

Description

Technical field [0001] The invention relates to a method for preparing a lithium-sulfur battery cathode material, and belongs to the technical field of battery materials. Background technique [0002] Lithium-sulfur battery is a kind of lithium battery with sulfur element as the positive electrode of the battery, and the theoretical discharge specific capacity of elemental sulfur can reach 1675mAh / g, which is much higher than that of commercial lithium-ion batteries. Therefore, the sulfur cathode active material is currently the cathode material with the highest specific capacity, and lithium is the metal element with the smallest relative atomic mass and the most negative standard electrode potential. Therefore, the lithium-sulfur battery has a high theoretical discharge voltage, a high theoretical discharge specific capacity, and a high theoretical specific energy. It is expected to meet the long-term development requirements of electric vehicles and is a very promising lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/36Y02E60/10
Inventor 张芳芳赵亚吴波涛郭恒志刘雷陈怀胜
Owner ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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