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Novel lithium-sulfur battery material applied to energy storage system

A technology for lithium-sulfur batteries and energy storage systems, applied in lithium batteries, nanotechnology for materials and surface science, battery electrodes, etc. Short life and other problems, to achieve high discharge performance, excellent coulombic efficiency, and promote the effect of fixation and transmission

Active Publication Date: 2021-06-18
GUANGXI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a new type of lithium-sulfur battery material applied to the energy storage system, to solve the problem of low conductivity of elemental sulfur in the positive electrode of the battery, the dissolution of polysulfides in the electrolyte, and the short cycle life of the battery due to the dissolution of polysulfides in the electrolyte. The volume expansion of the positive electrode during the cycle of the battery causes the technical problems of low charge-discharge performance and low rate performance

Method used

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  • Novel lithium-sulfur battery material applied to energy storage system
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  • Novel lithium-sulfur battery material applied to energy storage system

Examples

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Effect test

Embodiment 1

[0036] A method for manufacturing a battery for an energy storage charging system, comprising the following steps:

[0037] The first step: making a composite cathode material of nitrogen-doped porous carbon fiber.

[0038] A. Mix 1g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123) with 10ml of tetraethyl orthosilicate (C 8 h 2 OO 4Si) Stir until completely dissolved to obtain solution A, wherein the P123 material can spontaneously form multimolecularly aggregated micelles in the solution, C 8 h 2 OO 4 Si serves as a carbon skeleton template.

[0039] B. With ethanol (C 2 h 5 OH) and concentrated hydrochloric acid (HCl) as a dispersant, add 40mL C 2 h 5 OH, 0.625 mL of HCl, and stirred for 10 min to obtain B solution.

[0040] C. Add 5 mL of deionized water to solution B, and stir for 2 hours to obtain solution C.

[0041] D.C. 2 h 4 N 4 As a carbon and nitrogen source, add 4 g of C to the C solution 2 h 4 N 4 Solution N w...

Embodiment 2

[0054] A method for manufacturing a battery for an energy storage charging system, comprising the following steps:

[0055] The first step: making a composite cathode material of nitrogen-doped porous carbon fiber.

[0056] A. Mix 1g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123) with 20ml of tetraethyl orthosilicate (C 8 h 2 OO 4 Si) Stir until completely dissolved to obtain solution A.

[0057] B. With ethanol (C 2 h 5 OH) and concentrated hydrochloric acid (HCl) as a dispersant, add 40mL C 2 h 5 OH, 0.475 mL of HCl, and stirred for 10 min to obtain B solution.

[0058] C. Add 10 mL of deionized water to solution B, and stir for 2 hours to obtain solution C.

[0059] D.C. 2 h 4 N 4 As a carbon and nitrogen source, add 5 g of C to the C solution 2 h 4 N 4 Solution N was obtained, and the solution N was heated and stirred for 1.5 h and evaporated to dryness to obtain sample D.

[0060] E. Take the D sample and heat it at 8...

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Abstract

The invention provides a novel lithium-sulfur battery material applied to an energy storage system, a preparation method adopting nitrogen-doped porous carbon fiber composite sulfur as a positive electrode material and a positive electrode plate of the positive electrode material. The preparation method of the composite positive electrode material comprises the following steps: mixing a polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, tetraethyl orthosilicate, ethanol, concentrated hydrochloric acid and cyanoguanidine according to a molar ratio of (0.001-0.01): (0.03-0.4): (0.6-1): (0.01-0.1): (0.01-0.5), and stirring until the raw materials are completely dissolved to obtain a solution N; evaporating the solution N to dryness, and heating to obtain a sample E; cooling the product E, adding the product E into an acid solution for etching, and performing suction filtration and evaporation to dryness to obtain nitrogen-doped porous carbon nanofibers; and mixing the nitrogen-doped porous carbon nanofiber with elemental sulfur to obtain the elemental sulfur loaded nitrogen-doped porous carbon nanofiber composite positive electrode material. The material can solve the technical problems of low conductivity of battery positive elemental sulfur and short charge-discharge cycle life of the battery caused by dissolution of polysulfide in electrolyte.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a novel lithium-sulfur battery material applied to an energy storage system. Background technique [0002] As a green and clean energy storage system device, lithium secondary battery is widely used in electronic mobile devices, military equipment and electric vehicles due to its advantages of high energy density, long service life and environmental friendliness. Commercialized traditional lithium-ion battery cathode materials are usually ternary materials, lithium cobaltate, lithium iron phosphate and lithium manganese oxide, etc. Most of them have a theoretical battery specific capacity of 100-300mAh / g, which cannot meet the market demand for high energy density lithium. Therefore, the development of new energy storage systems with high energy density is one of the effective ways to meet the needs of commercialization. [0003] Therefore, lithium-s...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCH01M4/362H01M4/38H01M4/583H01M4/625H01M10/052B82Y30/00B82Y40/00Y02E60/10
Inventor 梁兴华李锁姜兴涛徐静蓝凌霄吴希
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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