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Positive electrode material of lithium-sulfur battery and preparation method thereof

A cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve the problems of poor battery cycle life, lithium-sulfur battery cathode capacity decline, etc., to achieve low cost, increase capacity and cycle time performance, improved lifetime and coulombic efficiency

Active Publication Date: 2018-09-04
吉林省东驰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a preparation method of a lithium-sulfur battery positive electrode material, the purpose of which is to increase the electronic conductivity, thereby increasing the capacity of the lithium-sulfur battery positive electrode, improving the cycle life of the lithium-sulfur battery, and solving the rapid decline in the lithium-sulfur battery positive electrode capacity. Issues leading to poor battery cycle life

Method used

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  • Positive electrode material of lithium-sulfur battery and preparation method thereof
  • Positive electrode material of lithium-sulfur battery and preparation method thereof
  • Positive electrode material of lithium-sulfur battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Preparation of BaTiO 3 powder:

[0035] a) Add barium acetate to 5ml ethylene glycol methyl ether and 2ml glacial acetic acid mixed organic solution and stir, wherein the content of barium acetate is 10-30wt% of the ethylene glycol methyl ether and glacial acetic acid mixed organic solution to obtain solution A ;

[0036] b) by BaTiO 3 In the chemical formula, the molar ratio of Ba and Ti is 1:1, and tetrabutyl titanate is weighed, and tetrabutyl titanate is added into the mixed organic solution of 10ml ethylene glycol methyl ether and 1ml acetylacetone for stirring to obtain solution B;

[0037] c) Weigh 5.40 g of acetic acid, 1.80 g of acetylacetone, 0.81 g of formamide, and 0.81 g of deionized water, and mix and stir for 5 to 15 minutes to obtain solution C. After stirring, pour it into solution A;

[0038] d) Pour solution B into solution A, mix and stir for about 4-6 hours, put it into a drying oven at 60-80°C, after drying, grind it sufficiently, and sinter...

Embodiment 2

[0052] (1) Preparation of BaTiO 3 powder:

[0053] a) Add barium acetate to 5ml ethylene glycol methyl ether and 3ml glacial acetic acid mixed organic solution and stir, wherein the content of barium acetate is 10-30wt% of the ethylene glycol methyl ether and glacial acetic acid mixed organic solution to obtain solution A ;

[0054] b) by BaTiO 3 In the chemical formula, the molar ratio of Ba and Ti is 1:1, and tetrabutyl titanate is weighed, and tetrabutyl titanate is added into the mixed organic solution of 10ml ethylene glycol methyl ether and 2ml acetylacetone for stirring to obtain solution B;

[0055] c) Weigh 5.40 g of acetic acid, 1.80 g of acetylacetone, 0.81 g of formamide, and 0.81 g of deionized water, and mix and stir for 5 to 15 minutes to obtain solution C. After stirring, pour it into solution A;

[0056] d) Pour solution B into solution A, mix and stir for about 4-6 hours, put it into a drying oven at 60-80°C, after drying, grind it sufficiently, and sinter i...

Embodiment 3

[0070] (1) Preparation of BaTiO 3 powder:

[0071] a) adding barium acetate to 5ml ethylene glycol methyl ether and 4ml glacial acetic acid mixed organic solution and stirring, wherein the content of barium acetate is 10-30wt% of the ethylene glycol methyl ether and glacial acetic acid mixed organic solution to obtain solution A ;

[0072] b) by BaTiO 3 In the chemical formula, the molar ratio of Ba and Ti is 1:1, and tetrabutyl titanate is weighed, and tetrabutyl titanate is added into the mixed organic solution of 10ml ethylene glycol methyl ether and 3ml acetylacetone for stirring to obtain solution B;

[0073] c) Weigh 5.40 g of acetic acid, 1.80 g of acetylacetone, 0.81 g of formamide, and 0.81 g of deionized water, and mix and stir for 5 to 15 minutes to obtain solution C. After stirring, pour it into solution A;

[0074] d) Pour solution B into solution A, mix and stir for about 4-6 hours, put it into a drying oven at 60-80°C, after drying, grind it sufficiently, and...

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Abstract

The invention provides a positive electrode material of a lithium-sulfur battery and a preparation method thereof, and aims at improving the electronic and electric conductivity so as to improve the capacity of a positive electrode of the lithium-sulfur battery and prolong the circle life of the lithium-sulfur battery, and solving the problem that the capacity of the positive electrode of the lithium-sulfur battery rapidly decreases, resulting in short circle life of the battery. The positive electrode material is characterized in that a BaTiO3 material is introduced, so that the electronic and electric conductivity of the positive electrode material can be improved, and the capacity and the circulating performance of the electrode can be effectively improved; the introduced porous carbonmaterial is high in specific area and high pore distribution performance, and a large number of elemental sulfur can be stored, so that high sulfur content in a composition is ensured; sulfur is uniformly distributed in porous carbon, so that the utilization rate of active substances of the sulfur can be increased; the pore channel structure of the porous carbon relieves the dissolution loss of anintermediate product which is polysulfide lithium, thus the shuttling effect is reduced; the service life of the battery is prolonged, and the coulombic efficiency is improved. The preparation methodis simple in processes, simple in equipment, short in manufacturing period, easy to operate, low in energy consumption, environmentally friendly, and easy for industrial production.

Description

technical field [0001] The invention relates to a lithium-sulfur battery cathode material and a preparation method thereof, belonging to the technical field of lithium-sulfur batteries. Background technique [0002] Environmental pollution and the depletion of power energy are triggering a new industrial revolution. It is imperative to vigorously research and develop renewable resources. The new energy revolution is not only a necessary condition for promoting economic development, but also a necessary guarantee for human survival. The development prospect of rechargeable batteries is considerable, which brings great convenience to human life. Lithium-ion batteries, which have attracted much attention in recent years, are produced under this demand. [0003] Lithium-ion batteries offer a flexible and lightweight design, high operating voltage, and low self-discharge rate compared to conventional commercial power supplies. However, lithium-ion batteries are facing a problem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/624H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 冯明李海波赵梓宇孙铭珠
Owner 吉林省东驰新能源科技有限公司
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