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Method for preparing cathode material of lithium-sulfur battery

A cathode material, a technology for lithium-sulfur batteries, applied in the field of electrodes, can solve the problems of low active material load and utilization rate, poor electrochemical performance of lithium-sulfur batteries, and low sulfur load content, etc., to achieve excellent electrochemical performance, improve Cyclic performance, the effect of improving electrical conductivity

Active Publication Date: 2017-06-20
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing the positive electrode material of a lithium-sulfur battery, which is to complete the reduction of graphene oxide, boron doping and solvothermal reaction in one step, and prepare boron-doped graphene / The method for the lithium-sulfur battery cathode material with sulfur composite three-dimensional structure overcomes the low and uneven sulfur loading content in the lithium-sulfur battery cathode material existing in the prior art, and the active material loading and utilization rate in the cathode material are both low, resulting in lithium Defects of poor electrochemical performance of sulfur batteries

Method used

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  • Method for preparing cathode material of lithium-sulfur battery

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Embodiment 1

[0029] The first step, the preparation of graphene oxide:

[0030] Graphene oxide was prepared by the Hummers method;

[0031] The second step is the preparation of boron-doped graphene / sulfur composite three-dimensional structure lithium-sulfur battery cathode material:

[0032] The graphene oxide, nano-sulfur powder and boric acid prepared in the first step will be weighed according to the mass ratio of 1:1:1 and placed in a ball mill jar, using a planetary ball mill, according to the ball-to-material ratio of 2:1, at 200 Ball mill for 6 hours at a speed of rpm to obtain a homogeneous mixture of the above three substances. According to the ratio of the mass ratio of the mixture to deionized water of 0.001:1, the mixture is added to deionized water, and ultrasonic dispersion is used at room temperature Ultrasonic disperse the mixture of graphene oxide, sulfur powder, boric acid and deionized water at 35kHz for 1 hour to obtain a suspension uniformly mixed with graphene oxide...

Embodiment 2

[0038] The first step, the preparation of graphene oxide:

[0039] Graphene oxide was prepared by the Hummers method;

[0040] The second step is the preparation of boron-doped graphene / sulfur composite three-dimensional structure lithium-sulfur battery cathode material:

[0041] The graphene oxide, nano-sulfur powder and boric acid prepared in the first step will be weighed according to the mass ratio of 1:5:2 and placed in a ball mill jar, using a planetary ball mill, according to the ball-to-material ratio of 3:1, at 400 Ball mill for 7 hours at a speed of rpm to obtain a homogeneous mixture of the above three substances. According to the mass ratio of the mixture to deionized water of 0.01:1, the mixture is added to deionized water, and ultrasonic dispersion is used at room temperature Ultrasonic disperse the above mixture of graphene oxide, sulfur powder, boric acid and deionized water at 50kHz for 2 hours to obtain a suspension uniformly mixed with graphene oxide, sulfu...

Embodiment 3

[0043] The first step, the preparation of graphene oxide:

[0044] Graphene oxide was prepared by the Hummers method;

[0045] The second step is the preparation of boron-doped graphene / sulfur composite three-dimensional structure lithium-sulfur battery cathode material:

[0046] The graphene oxide, nano-sulfur powder and boric acid prepared in the first step will be weighed according to the mass ratio of 1:10:3 and placed in a ball mill jar, using a planetary ball mill, according to the ball-to-material ratio of 4:1, at 600 Ball mill for 8 hours at a speed of rpm to obtain a homogeneous mixture of the above three substances. According to the ratio of the mass ratio of the mixture to deionized water of 0.03:1, the mixture is added to deionized water, and ultrasonic dispersion is used at room temperature Ultrasonic disperse the mixture of graphene oxide, sulfur powder, boric acid and deionized water at 60kHz for 3 hours to obtain a suspension uniformly mixed with graphene oxid...

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Abstract

The invention relates to a method for preparing a cathode material of a lithium-sulfur battery, and relates to an electrode formed by an active material. The method is characterized in that the graphene oxide reduction, boron doping and solvent thermal reaction are completed by one step, and the cathode material of the lithium-sulfur battery with a boron-doped graphene / sulfur composite three-dimensional structure is prepared by a one-step method. The defects that the cathode material of the lithium-sulfur battery has small and uneven sulfur load content, and low active material load and utilization rate, resulting in poor electrochemical performance of the lithium-sulfur battery in the prior art are overcome.

Description

technical field [0001] The technical solution of the invention relates to an electrode composed of active materials, in particular to a preparation method of a cathode material for a lithium-sulfur battery. Background technique [0002] With the widespread application of lithium-ion batteries in portable electronics, electric vehicles, and plug-in hybrid electric vehicles, there is an urgent need to develop lithium-ion batteries with higher energy density to meet market demands. At present, the theoretical specific capacity of the commercialized lithium-ion battery is limited by its own theoretical specific capacity of 300mAh / g, which obviously cannot meet the quality requirements for the practical application of lithium-ion batteries, while the theoretical specific capacity of the new lithium-sulfur battery is about Five times the theoretical specific capacity of ion batteries (theoretical specific capacity is 1675mAh / g, specific energy is 2500Wh / kg), it is considered to be...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/587H01M4/62H01M10/052Y02E60/10
Inventor 李海鹏王卓李袁军孙熙文孙连城杨爽刘雯刘斐然曹航畅
Owner HEBEI UNIV OF TECH
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