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A new type of high-efficiency lithium-sulfur battery cathode material and its preparation method

A technology for positive electrode materials and lithium-sulfur batteries, applied in battery electrodes, lithium batteries, positive electrodes, etc., can solve the problems of poor conductivity, low utilization rate, and shuttle effect of positive electrode materials, so as to improve conductivity, ease migration, and improve discharge The effect of specific capacity

Active Publication Date: 2022-04-26
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new type of high-efficiency lithium-sulfur battery cathode material and its preparation for the defects of low active material utilization rate, poor conductivity and shuttling effect of the lithium-sulfur battery cathode material prepared in the prior art method, the positive electrode material has high conductivity, has physical adsorption and chemical adsorption on polysulfides, and also has electrocatalysis, promotes the conversion of polysulfides, effectively inhibits the shuttle effect, and combines multiple effects into one

Method used

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  • A new type of high-efficiency lithium-sulfur battery cathode material and its preparation method
  • A new type of high-efficiency lithium-sulfur battery cathode material and its preparation method

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Embodiment 1

[0030] The novel high-efficiency lithium-sulfur battery cathode material is a CNT-ZnCo-LDH composite material. The CNT-ZnCo-LDH composite material is composed of layered zinc-cobalt double hydroxide ZnCo-LDH uniformly attached to the multi-walled carbon nanotube CNT.

[0031] The preparation method of the novel high-efficiency lithium-sulfur battery cathode material specifically comprises the following steps:

[0032] (1) Preparation of CNT-ZnO: First, dissolve 0.3g of zinc acetate in 55mL of anhydrous methanol, stir at 50°C until completely dissolved to obtain a zinc acetate solution, add the zinc acetate solution into a round bottom flask for oil bath, Insulate at 70°C; then add 0.2g of CNT to 35mL of anhydrous methanol, sonicate until completely dissolved, add the dissolved CNT solution to the above round bottom flask, stir at 70°C for 25min; finally add 0.25g of potassium hydroxide Add it into 45mL of anhydrous methanol, stir and heat on a 70°C heating plate, add the heat...

Embodiment 2

[0038] The preparation method of the novel high-efficiency lithium-sulfur battery cathode material specifically comprises the following steps:

[0039] (1) Preparation of CNT-ZnO: First, dissolve 0.2g of zinc acetate in 50mL of anhydrous methanol, stir at 40°C until completely dissolved to obtain a zinc acetate solution, add the zinc acetate solution to a round bottom flask for oil bath, Insulate at 65°C; then add 0.1g of CNT to 30mL of anhydrous methanol, sonicate until completely dissolved, add the dissolved CNT solution to the above round bottom flask, stir at 65°C for 20min; finally add 0.2g of potassium hydroxide Add it into 40mL of anhydrous methanol, stir and heat on a 65°C heating plate, add the heated potassium hydroxide solution dropwise into the above round bottom flask, stir at 65°C for 1h, centrifuge to collect the precipitate, and use The precipitate was washed three times with anhydrous methanol, and dried at 60°C for 13 hours to obtain CNT-ZnO;

[0040] (2) Pr...

Embodiment 3

[0044] The preparation method of the novel high-efficiency lithium-sulfur battery cathode material specifically comprises the following steps:

[0045] (1) Preparation of CNT-ZnO: First, dissolve 0.4g of zinc acetate in 60mL of anhydrous methanol, stir at 60°C until completely dissolved to obtain a zinc acetate solution, add the zinc acetate solution into a round bottom flask for oil bath, Insulate at 75°C; then add 0.3g of CNT to 40mL of anhydrous methanol, sonicate until completely dissolved, add the dissolved CNT solution to the above round bottom flask, stir at 75°C for 30min; finally add 0.3g of potassium hydroxide Add it into 50mL of anhydrous methanol, stir and heat on a 75°C heating plate, add the heated potassium hydroxide solution dropwise into the above-mentioned round bottom flask, stir at 75°C for 3h, centrifuge to collect the precipitate, and use The precipitate was washed three times with anhydrous methanol, and dried at 70°C for 14 hours to obtain CNT-ZnO;

[...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a novel high-efficiency lithium-sulfur battery cathode material and a preparation method thereof. The cathode material is a CNT‑ZnCo‑LDH composite material. The positive electrode material has high conductivity, not only has physical adsorption and chemical adsorption for polysulfides, but also has electrocatalysis, promotes the conversion of polysulfides, effectively inhibits the shuttle effect, and combines multiple effects into one.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a novel high-efficiency lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] With the rapid development of society and the rapid growth of economic level, people's demand for energy has also increased steadily. Lithium-ion battery is currently the most widely used battery type, with the advantages of high energy density, low self-discharge rate and long service life, so it has broad application prospects. Although the current specific capacity of lithium-ion batteries is close to its theoretical specific capacity of 300mAh. g -1 , but still unable to meet the increasing energy demand of human production and life, especially with the popularization of portable electronic devices, mobile power and new energy vehicles, the relatively low energy density of lithium-ion batteries is increasingly unable to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/052
CPCH01M4/366H01M4/625H01M10/052H01M4/525H01M4/485H01M2004/028Y02E60/10
Inventor 王新李超杰
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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