Lithium-sulfur battery positive electrode material and preparation method thereof

A technology for lithium-sulfur batteries and positive electrode materials, which is applied to battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of cumbersome preparation process, and achieve the effects of simplifying the process, reducing pollution, and stabilizing cycle performance.

Active Publication Date: 2018-10-02
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the objectives of the present invention is mainly to provide a lithium-sulfur battery positive electrode material in order to solve the above-mentioned existing grinding smear preparation process which is cumbersome and requires technical problems such as current collectors, conductive agents and binders. The use of current collectors, conductive agents and binders, without grinding and coating, can be used directly as anode materials for lithium-sulfur batteries, which simplifies the preparation process and has the advantages of excellent electrochemical performance

Method used

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  • Lithium-sulfur battery positive electrode material and preparation method thereof
  • Lithium-sulfur battery positive electrode material and preparation method thereof
  • Lithium-sulfur battery positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] A lithium-sulfur battery cathode material, specifically prepared by a method comprising the following steps:

[0046] (1) Take 3 ml of N,N-dimethylformamide in a clean glass bottle, then weigh 0.3 g of polyacrylonitrile with a molecular weight of 150,000 as a solute, pour it into the above glass bottle, and place it on a stirring table Stir at a stirring speed of 600r / min for 12h to obtain a polyacrylonitrile solution;

[0047] (2) Take two glass bottles, A and B, and add 1.5ml of the polyacrylonitrile solution obtained in step (1) to each;

[0048] A bottle of polyacrylonitrile solution continued to stir at a stirring speed of 600r / min for 12h;

[0049] Add 0.015 g of copper nitrate to the polyacrylonitrile solution in bottle B, then place it on a stirring table and continue stirring for 12 hours at a stirring speed of 600 r / min until the copper nitrate is dissolved and dispersed evenly to obtain a spinning solution;

[0050] (3) Pour the bottle A of polyacrylonitril...

Embodiment 2

[0067] A lithium-sulfur battery cathode material, specifically prepared by a method comprising the following steps:

[0068] (1) Take 3ml of N,N-dimethylacetamide in a clean glass bottle, then weigh 0.3g of polyacrylonitrile with a molecular weight of 150,000 as a solute, pour it into the above glass bottle, and place it on a stirring table Stir at a stirring speed of 600r / min for 12h, and prepare a polyacrylonitrile solution;

[0069] (2) Take two glass bottles, A and B, and add 1.5ml of the polyacrylonitrile solution prepared in step (1) to each;

[0070] A bottle of polyacrylonitrile solution continued to stir at a stirring speed of 600r / min for 12h;

[0071] Add 0.015 g of cobalt acetate into the polyacrylonitrile solution in bottle B, then place it on a stirring table and continue stirring for 12 hours at a stirring speed of 600 r / min until the cobalt acetate is dissolved and dispersed evenly to obtain a spinning solution;

[0072] (3) Pour the bottle A of polyacrylonit...

Embodiment 3

[0084] A lithium-sulfur battery cathode material, specifically prepared by a method comprising the following steps:

[0085] (1) Put 3 ml of absolute ethanol in a clean glass bottle, weigh 0.3 g of polyvinylpyrrolidone with a molecular weight of 1,300,000 as a solute, pour it into the above glass bottle, and place it on a stirring table with 600r / min stirring Stir at a high speed for 12 hours to obtain a polyvinylpyrrolidone solution;

[0086] (2) Take two glass bottles, A and B, and add 1.5ml of the polyvinylpyrrolidone solution prepared in step (1) to each;

[0087] A bottle of polyvinylpyrrolidone solution continued to stir at a stirring speed of 600r / min for 12h;

[0088] Add nickel nitrate with a mass of 0.015 g to the polyvinylpyrrolidone solution in bottle B, then place it on a stirring table and continue stirring for 12 hours at a stirring speed of 600 r / min until the nickel nitrate is dissolved and dispersed evenly to obtain a spinning solution;

[0089] (3) Pour th...

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Abstract

The invention discloses a lithium-sulfur battery positive electrode material and a preparation method thereof. An electrostatic spinning solution with solutes of a carbon-containing polymer and a carbon-containing polymer and transnational metal salt is prepared firstly, and electrostatic spinning and carbonization processing are performed to obtain a dual-layer flexible transitional metal-in-situ-doped carbon nanofiber base material; then, liquid phase sulfur loading is performed through a sublimed sulfur / carbon disulfide solution to obtain a sulfur-loaded dual-layer carbon nanofiber base material; next, a four-layer carbon nanofiber base material with carbon nanofiber layers with in-situ doped transitional metal and uniformly loaded with sulfur in the middle two layers is constructed; then the temperature is heated to 150 DEG C and maintained for 15min; furnace cooling is performed to obtain the lithium-sulfur battery positive electrode material; the sulfur content is 40-60%; when the lithium-sulfur battery positive electrode material is directly used as the positive electrode of the flexible binder-free and self-supported lithium-sulfur battery, very high discharge specific capacity and stable cycle performance are achieved; and the high-rate charging-discharging performance is obviously improved compared with that of the lithium-sulfur battery positive electrode material inthe prior art.

Description

technical field [0001] The invention relates to a flexible self-supporting high-rate performance lithium-sulfur battery cathode material and a preparation method thereof, belonging to the technical field of electrical materials. Background technique [0002] With the increasing demand for portable electronic devices and next-generation electric vehicles, building a high-energy battery system has become a key scientific issue in the development of current energy storage battery technology. As a new generation of energy storage system, lithium-sulfur battery has a theoretical energy density much higher than the current commercial lithium-ion battery, which can meet the energy storage requirements of most electronic devices. However, the existence of various problems such as the poor conductivity of sulfur and its discharge products, the nearly 80% volume expansion of positive electrode materials during charge and discharge, and the "shuttle effect" of intermediate polysulfides...

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
CPCB82Y30/00H01M4/366H01M4/38H01M4/625H01M4/626H01M10/052Y02E60/10
Inventor 郑时有边子浩杨俊和庞越鹏杨欢关山崔凯高维贺
Owner UNIV OF SHANGHAI FOR SCI & TECH
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