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Preparation method of lithium-sulfur battery composite positive electrode material

A technology for composite positive electrode materials and lithium-sulfur batteries, which is applied in battery electrodes, lithium batteries, positive electrodes, etc., can solve the problems of reduced electrical conductivity of materials, and achieve the effects of preventing oxidation, good electrochemical performance, and protecting materials

Active Publication Date: 2021-10-01
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a template is used in this patented preparation method, no carbon source is added to the prepared material, which will reduce the electrical conductivity of the material

Method used

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  • Preparation method of lithium-sulfur battery composite positive electrode material
  • Preparation method of lithium-sulfur battery composite positive electrode material
  • Preparation method of lithium-sulfur battery composite positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Synthesis of g-C 3 N 4

[0056] Put 5g of urea in a porcelain boat, put the porcelain boat into a tube furnace for calcination, in a nitrogen atmosphere, raise the temperature to 550°C at a rate of 5°C / min, and keep it at this temperature for 3h to obtain g-C 3 N 4 ;

[0057] (2) Synthetic precursor

[0058] 0.15g g-C 3 N 4 After mixing with 0.08g CNTs, add it into 15mL deionized water, and ultrasonically disperse for 30min to obtain a mixed suspension; In ionized water, the mixed solution was obtained; the mixed solution and the mixed suspension were stirred and reacted at 20°C for 12 hours to obtain a precipitate; the precipitate was centrifuged and dried to obtain a powder, and the powder obtained after the centrifuged drying was placed in a porcelain boat, and the porcelain boat was placed Put it into a tube furnace for calcination, in a nitrogen atmosphere, raise the temperature to 500°C at a heating rate of 2°C / min, and keep it at this temperature for 3...

Embodiment 2

[0064] (1) Synthesis of g-C 3 N 4

[0065] Put 5g of urea in a porcelain boat, put the porcelain boat into a tube furnace for calcination, in a nitrogen atmosphere, raise the temperature to 550°C at a rate of 5°C / min, and keep it at this temperature for 3h to obtain g-C 3 N 4 ;

[0066] (2) Synthetic precursor

[0067] 0.15g g-C 3 N 4 After mixing with 0.08g CNTs, add it into 15mL deionized water, and ultrasonically disperse for 30min to obtain a mixed suspension; In ionized water, the mixed solution was obtained; the mixed solution and the mixed suspension were stirred and reacted at 20°C for 12 hours to obtain a precipitate; the precipitate was centrifuged and dried to obtain a powder, and the powder obtained after the centrifuged drying was placed in a porcelain boat, and the porcelain boat was placed Put it into a tube furnace for calcination, in a nitrogen atmosphere, raise the temperature to 500°C at a heating rate of 2°C / min, and keep it at this temperature for 3...

Embodiment 3

[0073] The urea in step (1) in Example 1 was changed to melamine, the calcination temperature was changed to 600° C., the holding time was changed to 2.5 h, and the rest of the steps were the same as in Example 1.

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Abstract

The invention belongs to the technical field of lithium-sulfur battery preparation, and particularly relates to a preparation method of a lithium-sulfur battery composite positive electrode material. The preparation method comprises the following steps: dispersing g-C3N4 and carbon nanotubes in deionized water to obtain a mixed suspension; dissolving tin tetrachloride pentahydrate, ferric nitrate nonahydrate and cobalt nitrate hexahydrate in deionized water to obtain a mixed solution; stirring, mixing and reacting the mixed solution and the mixed turbid liquid to obtain a precipitate; drying and calcining the precipitate to obtain a precursor A; performing acid etching on the precursor A to obtain a precursor B; mixing the precursor B with sulfur, and carrying out ball milling to obtain mixed powder; and calcining the mixed powder to obtain the lithium-sulfur battery composite positive electrode material. Based on the defect of electrochemical performance of a single doped material of the lithium-sulfur battery, the SnO2 template and the g-C3N4 frame are creatively doped with the raw material of the lithium-sulfur battery at the same time, so that the battery performance is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur battery preparation, and in particular relates to a preparation method of a lithium-sulfur battery composite cathode material. Background technique [0002] Lithium-sulfur batteries are one of the most promising electrochemical energy storage systems with high energy density so far. It is composed of a sulfur positive electrode and a lithium negative electrode as an energy storage system with high energy density and high theoretical specific capacity. In the 1960s, researchers proposed the concept of a lithium / sulfur battery system composed of metallic lithium anodes and elemental sulfur cathodes, and theoretically verified that lithium and elemental sulfur can achieve multi-electron conversion reactions and high energy storage. At present, the relatively mature commercial lithium-ion battery system is mainly used in LiCoO2 for portable electronic products. 2 / Graphite system and LiFePO u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M10/052
CPCH01M4/362H01M4/38H01M4/485H01M10/052H01M2004/028Y02E60/10
Inventor 张维民房志敏张丽鹏张保国潘科峰李德刚龚媛媛张迪蒋文冯宇王立王亿周董玲玲刘双慧胡晓梅张浩宇
Owner SHANDONG UNIV OF TECH
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