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Three-dimensional porous graphene-supported carbon-coated lithium sulfide cathode material as well as preparation method and application thereof

A three-dimensional porous, positive electrode material technology, applied in the direction of battery electrodes, electrochemical generators, electrical components, etc., can solve problems such as troublesome operation, achieve the effects of maintaining stability, improving electrical conductivity, and simple preparation process

Inactive Publication Date: 2016-03-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods can improve the electrochemical performance of lithium-sulfur batteries to a certain extent, the electrochemical performance such as specific discharge capacity and cycle performance are still far from commercialization and need to be improved.
Moreover, lithium sulfide is easy to react with water, and the direct modification of lithium sulfide needs to be carried out under a protective atmosphere, which is troublesome to operate.

Method used

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  • Three-dimensional porous graphene-supported carbon-coated lithium sulfide cathode material as well as preparation method and application thereof
  • Three-dimensional porous graphene-supported carbon-coated lithium sulfide cathode material as well as preparation method and application thereof
  • Three-dimensional porous graphene-supported carbon-coated lithium sulfide cathode material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Disperse graphene oxide in 140g deionized water with magnetic stirring, and ultrasonically 1h to form a uniform and stable solution, the concentration of graphene oxide in the graphene oxide solution is 2mg / ml, then add reducing agent thiourea and stir to dissolve, Obtain a brown solution, the concentration of reducing agent thiourea in the brown solution is 1.5mg / mL;

[0031] (2) Transfer the brown solution obtained above to an autoclave, seal the autoclave and place it at 180° C. for 10 hours, then wait for the temperature of the autoclave to drop to room temperature 25° C. to obtain a columnar three-dimensional porous graphene solution ;

[0032] (3) add lithium sulfate monohydrate and glucose in the solution of the columnar three-dimensional porous graphene of gained, after stirring and dissolving, columnar three-dimensional porous graphene is soaked wherein, form the soaking liquid of columnar three-dimensional porous graphene, the columnar three-dimensional poro...

Embodiment 2

[0041] (1) Disperse graphene oxide in 140g deionized water with magnetic stirring, and ultrasonically 1h to form a uniform and stable solution, the concentration of graphene oxide in the graphene oxide solution is 3mg / ml, then add reducing agent thiourea and stir to dissolve, Obtain a brown solution, and the concentration of reducing agent thiourea in the brown solution is 5 mg / mL;

[0042] (2) Transfer the brown solution obtained above to an autoclave, seal the autoclave and place it at 180° C. for 10 hours, then wait for the temperature of the autoclave to drop to room temperature 25° C. to obtain a columnar three-dimensional porous graphene solution ;

[0043] (3) Add lithium sulfate and polyvinylpyrrolidone with a number average molecular weight of 58,000 to the obtained columnar three-dimensional porous graphene and the solution, and soak the columnar three-dimensional porous graphene to obtain the soaking solution of columnar three-dimensional porous graphene, columnar t...

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Abstract

The invention discloses a three-dimensional porous graphene-supported carbon-coated lithium sulfide cathode material as well as a preparation method and application thereof. The preparation method comprises the following steps: dispersing oxidized grapheme in water for magnetic stirring, then adding a reducing agent, stirring and dissolving to obtain a brown solution; putting the solution at the temperature of 120-200 DEG C to carry out a hydrothermal reaction for 4-12 h so as to obtain a columnar three-dimensional porous grapheme solution; adding lithium sulfate and a carbon source to the columnar three-dimensional porous grapheme solution to form a columnar three-dimensional porous grapheme soak solution; carrying out freeze drying on the soak solution to obtain a precursor; calcining the precursor for 2-12 h under a protective atmosphere at the temperature of 800-1000 DEG C so as to obtain the three-dimensional porous graphene-supported carbon-coated lithium sulfide material. A battery cathode can be prepared through direct slicing by using the prepared material, the steps of slurry preparation, coating and drying are saved, the technology is simpler, and the material is suitable for large-scale production and has excellent electrical properties.

Description

technical field [0001] The invention relates to the field of lithium-sulfur battery materials, in particular to a three-dimensional porous graphene-supported carbon-coated lithium sulfide positive electrode material and a preparation method and application thereof. Background technique [0002] Environmental issues and energy crisis are two major challenges facing human society today, and the development of clean and renewable new energy has become an urgent need of today's society. Lithium-ion secondary batteries that are currently widely used with embedded lithium-containing transition metal oxide-based (lithium manganese oxide, lithium cobalt oxide, ternary, lithium iron phosphate, layered lithium-rich lithium manganese oxide) materials as positive electrodes, due to their The limitation of theoretical capacity (the energy density of the current material system is difficult to break through the energy density bottleneck of 250Wh / kg), has been unable to meet the current re...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5815H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 涂江平汪东煌王秀丽夏新辉谷长栋
Owner ZHEJIANG UNIV
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