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Novel lithium-sulfur battery cathode material and preparation method thereof

A positive electrode material, lithium-sulfur battery technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve problems such as unreachable, performance limitations, poor conductivity, etc., to achieve large output and preparation The method is simple and easy to operate, and the effect of the experimental scheme is simple

Inactive Publication Date: 2019-02-01
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

However, MOFs materials usually have poor conductivity, which limits their performance when used as lithium-ion electrode materials, and in most cases cannot achieve the expected results.

Method used

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  • Novel lithium-sulfur battery cathode material and preparation method thereof
  • Novel lithium-sulfur battery cathode material and preparation method thereof
  • Novel lithium-sulfur battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The raw material of the novel lithium-sulfur battery cathode material includes Co-MOF material and reduced graphene oxide. Place

[0032] The mass ratio of the Co-MOF material to the reduced graphene oxide is 2.5:1.

[0033] The preparation method of the novel lithium-sulfur battery cathode material comprises the following steps:

[0034] (1) Preparation of Co-MOF materials: first prepare 50 mL of a mixture of N,N-dimethylformamide and ethanol

[0035] solution, and then 0.16 g Co(NO 3 ) 2 ·6H 2 O and 0.092 g of terephthalic acid were dissolved in the mixed solution; then the dissolved mixed solution was placed in a hydrothermal reactor at a reaction temperature of 100° C. and a reaction time of 25 hours to obtain pink-purple flaky crystals; finally Place the crystals in an oven and dry at 50°C for 12 hours to obtain Co-MOF; the volume ratio of N,N-dimethylformamide:ethanol is 4:1;

[0036] (2) Preparation of Co-MOF / reduced graphene oxide composite material: first...

Embodiment 2

[0043] The raw material of the novel lithium-sulfur battery cathode material includes Co-MOF material and reduced graphene oxide. Place

[0044] The mass ratio of the Co-MOF material to the reduced graphene oxide is 2.4:1.

[0045] The preparation method of the novel lithium-sulfur battery cathode material comprises the following steps:

[0046] (1) Preparation of Co-MOF materials: first prepare 60 mL of a mixed solution of N,N-dimethylformamide and ethanol, and then mix 0.24 g Co(NO 3 ) 2 ·6H 2 O and 0.138g of terephthalic acid were dissolved in the mixed solution; then the dissolved mixed solution was placed in a hydrothermal reactor at a reaction temperature of 120°C and a reaction time of 30h to obtain pink-purple flaky crystals; finally Place the crystal in an oven and dry it at 60°C for 18 hours to obtain Co-MOF; the volume ratio of N,N-dimethylformamide:ethanol is 4:1;

[0047] (2) Preparation of Co-MOF / reduced graphene oxide composite material: firstly, the obtain...

Embodiment 3

[0053] The raw material of the novel lithium-sulfur battery cathode material includes Co-MOF material and reduced graphene oxide. Place

[0054] The mass ratio of the Co-MOF material to the reduced graphene oxide is 3:1.

[0055] The preparation method of the novel lithium-sulfur battery cathode material comprises the following steps:

[0056] (1) Preparation of Co-MOF materials: first prepare 70 mL of a mixture of N,N-dimethylformamide and ethanol

[0057] solution, and then 0.32g Co(NO 3 ) 2 ·6H 2 O and 0.184 g of terephthalic acid were dissolved in the mixed solution; then the dissolved mixed solution was placed in a hydrothermal reactor at a reaction temperature of 150° C. and a reaction time of 40 h to obtain pink-purple flaky crystals; finally Place the crystal in an oven and dry it at 70°C for 20 hours to obtain Co-MOF; the volume ratio of N,N-dimethylformamide:ethanol is 4:1;

[0058] (2) Preparation of Co-MOF / reduced graphene oxide composite material: first, mix...

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Abstract

The invention belongs to the technical field of a lithium-sulfur battery and particularly relates to a novel lithium-sulfur battery cathode material and a preparation method thereof. The raw materialsinclude a Co-MOF material and reduced graphene oxide. The cathode material overcomes the problems that a lithium-sulfur battery cathode material in the prior art is low in effective sulfur support quantity, has obvious shuttle effect of polysulfides, cause significant volume expansion effect on the lithium-sulfur battery and instable electrochemical performance on the battery. The cathode material is high in specific capacity.

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 cathode material and a preparation method thereof. Background technique [0002] With the rapid development of society, human beings have an increasing demand for energy, but with the continuous improvement of people's living standards, some major fossil energy sources, such as coal, oil, and natural gas, are increasingly in short supply. At the same time, the burning of some fossil energy causes environmental pollution and damage that cannot be repaired. For example, the excessive emission of carbon dioxide leads to the greenhouse effect, which in turn leads to the continuous rise of sea levels. At the same time, the continuous emission of automobile exhaust will also lead to The worsening of smog will seriously threaten human health and living environment. Therefore, it is imminent to study new renewable clean energy ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/38H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 钊妍张俊凡
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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