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A lithium sulfide battery cathode material and a lithium sulfide battery thereof

A sulfur cathode material and cathode material technology, applied in the field of material chemistry, can solve the problems of low utilization rate of cathode materials and affect the electrochemical performance of lithium-sulfur batteries, so as to enhance electrochemical performance, improve reaction reversibility, and improve electrochemical performance. Effect

Inactive Publication Date: 2019-01-18
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a lithium-sulfur battery positive electrode material and its lithium-sulfur battery in view of the low utilization rate of the existing lithium-sulfur battery positive electrode material, which affects the electrochemical performance of the lithium-sulfur battery

Method used

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  • A lithium sulfide battery cathode material and a lithium sulfide battery thereof
  • A lithium sulfide battery cathode material and a lithium sulfide battery thereof
  • A lithium sulfide battery cathode material and a lithium sulfide battery thereof

Examples

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Effect test

Embodiment 1

[0025] The lithium-sulfur battery positive electrode material is prepared by a preparation method comprising the following steps:

[0026] (1) Preparation of silica-polyacrylonitrile film by electrospinning: polyacrylonitrile is dissolved in N, N-dimethylformamide solution to obtain polyacrylonitrile / N, N-dimethylformamide solution, in At a temperature of 25°C to 50°C, SiO with a particle size of 30nm 2 The particles were stirred and dissolved into a polyacrylonitrile / N,N-dimethylformamide solution to obtain a polymer solution, in which polyacrylonitrile and SiO 2 The mass ratio of the obtained polymer solution is 0.5; the obtained polymer solution is sucked into the syringe, and the silica-polyacrylonitrile film is obtained by electrospinning using the following parameters: the distance between the needle tip and the receiving cylinder is adjusted to 25cm, and the applied voltage is 18KV. The syringe pump rate is 0.3mL / h, and the speed of the collector is 500rpm;

[0027] (...

Embodiment 2

[0033] The lithium-sulfur battery positive electrode material is prepared by a preparation method comprising the following steps:

[0034] (1) Preparation of silica-polyacrylonitrile film by electrospinning: polyacrylonitrile is dissolved in N, N-dimethylformamide solution to obtain polyacrylonitrile / N, N-dimethylformamide solution, in At a temperature of 25°C to 50°C, SiO with a particle size of 30nm 2 The particles were stirred and dissolved into a polyacrylonitrile / N,N-dimethylformamide solution to obtain a polymer solution, in which polyacrylonitrile and SiO 2 The mass ratio of the obtained polymer solution is 0.5; the obtained polymer solution is sucked into the syringe, and the silica-polyacrylonitrile film is obtained by electrospinning using the following parameters: the distance between the needle tip and the receiving cylinder is adjusted to 25cm, and the applied voltage is 18KV. The syringe pump rate is 0.3mL / h, and the speed of the collector is 500rpm;

[0035] (...

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Abstract

The invention belongs to the technical field of material chemistry, in particular to a lithium sulfur battery cathode material and a lithium sulfur battery thereof. A lithium sulfide battery cathode material is prepared by that following preparation method: using N, N-Dimethylformamide as solvent, dissolving polyacrylonitrile and silica in N, N-Dimethylformamide Solution to prepare the spinning precursor liquid; preparing a silica-polyacrylonitrile membrane by using the electrospinning; carbonizing the silica-polyacrylonitrile membrane to obtain carbon fiber-silica composites, then soaking thecarbon fiber-silica composite in hydrofluoric acid to form the porous carbon fiber material, and doping the porous carbon fiber material with sulfur to prepare nitrogen doped porous carbon-sulfur cathode material in situ. The cathode material of the lithium sulfide battery has a porous structure, provides a large number of ion channels and a high specific surface area, effectively improves the shuttle effect of polysulfides in the lithium sulfide battery, and improves the cycle life of the lithium sulfide battery and the utilization rate of active substances in the cathode material.

Description

technical field [0001] The invention belongs to the technical field of material chemistry, and in particular relates to a lithium-sulfur battery cathode material and the lithium-sulfur battery. Background technique [0002] With the rapid development of science and technology and communication, the development of new materials for energy storage with high specific energy has become an urgent need. The theoretical specific capacity of lithium-sulfur batteries reaches 1672mAh / g (theoretical energy density can reach 2600Wh / kg), which is several times the specific capacity of existing lithium-ion batteries, and sulfur has the advantages of abundant reserves, low price and environmental friendliness. Therefore, lithium-sulfur batteries have become one of the most research-worthy energy storage systems. [0003] However, lithium-sulfur batteries have problems such as poor conductivity of elemental sulfur, poor conductivity of intermediate products in the charge and discharge proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 王新贺禹森
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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