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A kind of positive electrode material of lithium-sulfur battery and preparation method thereof

A cathode material, lithium-sulfur battery technology, applied in lithium batteries, battery electrodes, and sulfur preparation/purification, etc., can solve the problems of non-commercialization of lithium-sulfur batteries, reduced capacity of lithium-sulfur batteries, and obstacles to electron transport, and achieve inhibition of lithium-sulfur batteries. Shuttle effect, improved cycle stability and rate capability, and the effect of short preparation cycle

Active Publication Date: 2022-03-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] So far, lithium-sulfur batteries are still not commercialized. There are three main aspects that restrict the practical application of lithium-sulfur batteries: the active material sulfur in the positive electrode material of lithium-sulfur batteries and its discharge products are both poor in conductivity, which limits the electron transmission at the positive electrode. The volume expansion rate of sulfur is as high as 80% before and after discharge, which easily leads to the collapse of the structure of the material; the process of reducing and oxidizing polysulfides in different valences and migrating back and forth between the positive and negative electrodes forms a shuttle effect, resulting in the active material. Loss, so that the capacity of lithium-sulfur batteries decreases during cycling

Method used

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  • A kind of positive electrode material of lithium-sulfur battery and preparation method thereof
  • A kind of positive electrode material of lithium-sulfur battery and preparation method thereof
  • A kind of positive electrode material of lithium-sulfur battery and preparation method thereof

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Effect test

Embodiment 1

[0030] (1) Dissolve 0.04g of polyvinylpyrrolidone (K-30) and 2.00g of sodium thiosulfate pentahydrate in 200mL of deionized water and stir evenly, add 1.6mL of concentrated hydrochloric acid (mass fraction of 37%) and magnetically stir to react. After 2h, centrifugation (centrifugation speed 4200r / min, centrifugation time 5min, the same below), washing and drying are performed in sequence to obtain hollow sulfur balls;

[0031] (2) Disperse 100 mg of hollow sulfur spheres in 50 mL of deionized water, add 100 mg of nickel nitrate hexahydrate and 200 mg of hexamethylene tetramine, ultrasonicate for 1 h under the ultrasonic power of 300 W, and then under the condition of 95 °C at 300 r / The hydrothermal stirring reaction was carried out at a stirring rate of min for 6 h, followed by cooling, centrifugation, washing, and drying in sequence after cooling to room temperature to obtain nickel hydroxide-coated hollow sulfur spheres (HS@Ni(OH) 2 );

[0032] (3) 100 mg of nickel hydrox...

Embodiment 2

[0036] (1) Dissolve 0.04g of polyvinylpyrrolidone (K-30) and 2.00g of sodium thiosulfate pentahydrate in 200mL of deionized water and stir evenly, add 1.6mL of concentrated hydrochloric acid (mass fraction of 37%) and magnetically stir to react. After 2 hours, centrifugation (centrifugation speed 4200r / min, centrifugation time 5min, the same below), washing and drying are performed in sequence to obtain hollow sulfur spheres;

[0037] (2) Disperse 100 mg of hollow sulfur spheres in 75 mL of deionized water, add 100 mg of nickel nitrate hexahydrate and 200 mg of hexamethylene tetramine, ultrasonicate for 1 h under the ultrasonic power of 300 W, and then under the condition of 95 ° C at 300 r / The hydrothermal stirring reaction was carried out at a stirring rate of min for 6 h, then the temperature was lowered, and then centrifugation, washing and drying were carried out in sequence after cooling to room temperature to obtain hollow sulfur spheres coated with nickel hydroxide;

...

Embodiment 3

[0042] (1) Dissolve 0.04g of polyvinylpyrrolidone (K-30) and 2.00g of sodium thiosulfate pentahydrate in 200mL of deionized water and stir evenly, add 1.6mL of concentrated hydrochloric acid (mass fraction of 37%) and magnetically stir to react. After 2 hours, centrifugation (centrifugation speed 4200r / min, centrifugation time 5min, the same below), washing and drying are performed in sequence to obtain hollow sulfur spheres;

[0043] (2) Disperse 100 mg of hollow sulfur spheres in 75 mL of deionized water, add 100 mg of nickel nitrate hexahydrate and 200 mg of hexamethylene tetramine, ultrasonicate for 1 h under the ultrasonic power of 300 W, and then under the condition of 95 ° C at 300 r / The hydrothermal stirring reaction was carried out at a stirring rate of min for 6 h, then the temperature was lowered, and then centrifugation, washing and drying were carried out in sequence after cooling to room temperature to obtain hollow sulfur spheres coated with nickel hydroxide;

...

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Abstract

The invention relates to a lithium-sulfur battery cathode material and a preparation method thereof, belonging to the technical field of lithium-sulfur battery cathode materials. The positive electrode material described in the present invention is a hollow sulfur sphere coated with nickel disulfide nanosheets. The hollow structure can alleviate the volume expansion in the charging and discharging process and improve the structural stability of the positive electrode material of the lithium-sulfur battery. The surface-coated trisulfide Nickel nanosheets can improve electrical conductivity, effectively inhibit the shuttle effect and help accelerate the redox process, improve the cycle stability and rate performance of lithium-sulfur batteries; the positive electrode material has mild preparation conditions and a short preparation cycle, making it possible for industrial production.

Description

technical field [0001] The invention relates to a lithium-sulfur battery positive electrode material and a preparation method thereof, and belongs to the technical field of lithium-sulfur battery positive electrode materials. Background technique [0002] With the increase of energy demand in modern society, the problems of environmental pollution and resource shortage related to fossil fuels are becoming more and more serious. In order to alleviate these problems, it is necessary to develop renewable clean energy technologies. Among them, lithium battery systems have attracted the attention of researchers, mainly lithium-ion batteries and lithium-sulfur batteries. At present, lithium-ion batteries have been widely used in electronic products such as mobile phones, notebook computers, and digital cameras, but they still cannot meet the growing demand for vehicle power batteries and grid-level energy storage. Compared with lithium-ion batteries, lithium-sulfur batteries have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/052C01G53/11C01B17/02B82Y40/00B82Y30/00
CPCH01M4/38H01M4/628H01M4/624H01M10/052C01B17/0253C01G53/11B82Y30/00B82Y40/00C01P2004/03C01P2002/72C01P2006/40Y02E60/10
Inventor 白羽孙克宁罗敏牛明鑫
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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