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S@VxSy composite positive electrode material, preparation method thereof and lithium-sulfur battery

A composite cathode material and carbon material technology, applied in the field of electrochemical energy, can solve problems such as poor sulfur fixation effect, achieve the effects of accelerating rapid migration and diffusion, increasing tap density, improving discharge specific capacity and cycle performance

Active Publication Date: 2021-07-02
PANZHIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the poor sulfur fixation effect of the existing lithium-sulfur battery

Method used

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  • S@VxSy composite positive electrode material, preparation method thereof and lithium-sulfur battery
  • S@VxSy composite positive electrode material, preparation method thereof and lithium-sulfur battery
  • S@VxSy composite positive electrode material, preparation method thereof and lithium-sulfur battery

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preparation example Construction

[0039] The above S@V x S y The preparation method of composite cathode material comprises the following steps:

[0040] a. Add vanadium source in ethylene glycol, add sulfur source and non-metallic carbon material after fully dissolving, add vanadium source and sulfur source in a molar ratio of 1:1-11, put it into the reaction kettle after fully dissolving and heat up to 150 -220°C, wash after the reaction, centrifugal filter and vacuum dry to get VS 4 composite materials;

[0041] b. The VS obtained in step a 4 Put the composite material into the tube furnace, pass inert gas to evacuate, then raise the temperature to 200-500°C at a rate of 1-10°C / min and keep it for 1-5h, then rise to 600-600°C at a rate of 2-10°C / min 1000°C for 0.5-3h, after calcination to get V x S y Composite cathode material;

[0042] c. Combine the sulfur element and the V obtained in step b x S y Composite cathode materials are combined to obtain S@V x S y Composite cathode material.

[0043...

Embodiment 1

[0056] In Example 1, S@V was prepared according to the following method x S y Composite cathode material:

[0057] a. Add ammonium metavanadate to 60ml of ethylene glycol, heat at 60°C and stir for 2 hours, then add thioacetamide, graphene and glucose, add ammonium metavanadate and sulfur source at a molar ratio of 1:10, add graphene The amount accounts for 10% of the total mass of the vanadium source and the sulfur source. The molar ratio of ammonium metavanadate and glucose is 2:3. After washing and centrifugal filtration, vacuum-dry at 60°C for 12 hours to obtain VS 4 Composite powder.

[0058] figure 1 VS prepared for Example 1 4 The XRD pattern of the composite material, as can be seen from the figure that the VS prepared by the present invention 4 For pure phase.

[0059] b. The VS obtained in step a 4 The composite material powder is put into a tube furnace, fed with argon gas for 2 hours and then evacuated, then the temperature is raised to 230°C at a rate of 1...

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Abstract

The invention discloses an S@VxSy composite positive electrode material, a preparation method thereof and a lithium-sulfur battery, and belongs to the field of electrochemical energy. The S@VxSy composite positive electrode material comprises composite particles, the composite particles comprise a vanadium matrix and a non-metal carbon material, the molecular formula of a precursor of the vanadium matrix is VS4, and VS4 is of a hexagonal snowflake sheet structure. The preparation method of the S@VxSy composite positive electrode material comprises the steps of preparing a VS4 composite material, preparing a VxSy composite positive electrode material, re-sulfurizing and the like. The S@VxSy composite positive electrode material designed by the invention is a multifunctional sulfur fixation carrier, and by combining conventional physical and chemical adsorption with catalytic sulfur fixation, the sulfur fixation effect of the lithium-sulfur battery is improved, diffusion and dissolution shuttling of lithium polysulfide are inhibited, the capacity of the battery is improved, and the cycle life of the battery is prolonged; the problem that an existing lithium-sulfur battery is poor in sulfur fixation effect is effectively solved.

Description

technical field [0001] The invention belongs to the field of electrochemical energy, and relates to a S@V x S y Composite positive electrode material and its preparation method and lithium-sulfur battery. Background technique [0002] Lithium-ion batteries are currently one of the most mature and highly commercialized energy storage systems in electrochemical energy storage systems, and are widely used in 3C digital products, large-scale energy storage, and electric vehicles. However, current lithium-ion batteries cannot meet the high energy density and low-cost requirements of large-scale energy storage systems, nor can they meet the cruising range of electric vehicles and fuel vehicles, that is, 500km / charge. Therefore, it is of great significance to develop a new generation of energy storage systems with high energy density, low cost, long life and environmental friendliness. [0003] Compared with lithium-ion battery cathode materials, lithium-sulfur batteries not onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/052C01B17/02C01G31/00
CPCH01M4/62H01M4/625H01M4/621H01M4/38H01M10/052C01G31/00C01B17/0243C01P2004/80C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 王颖张义永户秀琼侯冀岳张斌伟艾瑞毛宇睿
Owner PANZHIHUA UNIV