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Lithium-sulfur battery positive electrode material and preparation method thereof

A cathode material and a technology for sulfur batteries, which are applied in the field of cathode materials for lithium-sulfur batteries and their preparation, can solve the problems of reduced Coulomb efficiency, reduced utilization rate of active materials, poor electrical conductivity, etc., achieve simple preparation steps and equipment, and improve cycle Stable and easy to use in industrial production

Pending Publication Date: 2020-05-29
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some problems that limit the development and industrialization of lithium-sulfur batteries
Such as 1) active material sulfur and discharge product Li 2 S and Li 2 S 2 The electronic / ionic conductivity of the ions is very poor, which causes the problem of low utilization of the active material; 2) the intermediate product (Li 2 S x , 3≤x≤8) are easily dissolved in the electrolyte, resulting in a "shuttle effect", resulting in serious loss of active materials, further reducing the utilization of active materials, and causing rapid capacity decay and reduced Coulombic efficiency; 3) simple substance Sulfur will undergo dramatic volume changes (up to 80%) during charge and discharge, which will lead to the collapse of the battery structure and affect battery life

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

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Embodiment 1

[0035] A lithium-sulfur battery positive electrode material, the positive electrode material includes a hollow positive electrode carrier material: cobalt-iron double hydroxide and sulfur particles filled in the carrier material.

[0036] A preparation method of lithium-sulfur battery cathode material, comprising the following steps:

[0037] Step 1. Stir and mix the iron source, fumaric acid and N,N-dimethylformamide solution to obtain a mixed solution; transfer the mixed solution to an autoclave, heat up to 80~100°C, and react for 2~5 h, cooled to room temperature, centrifuged, collected the precipitate, and obtained the precursor Fe-MOFs material;

[0038] Step 2. Fully wash the Fe-MOFs obtained in Step 1 with DMF solution, and dry at a temperature of 75-85°C for 12-24 h, and set aside;

[0039]Step 3, ultrasonically disperse the Fe-MOFs material obtained in step 2 in absolute ethanol to obtain solution A, dissolve the cobalt source and urea with a molar ratio of 2 to 3:1 ...

Embodiment 2

[0048] A lithium-sulfur battery positive electrode material, the positive electrode material includes a hollow positive electrode carrier material: cobalt-iron double hydroxide and sulfur particles filled in the carrier material.

[0049] A preparation method of lithium-sulfur battery cathode material, comprising the following steps:

[0050] Step 1. Prepare the precursor Fe-MOFs material by solvothermal method, specifically stirring and mixing the iron source, fumaric acid and N,N-dimethylformamide solution to obtain a mixed solution; transfer the mixed solution to high pressure In the kettle, the temperature was raised to 100 ° C, reacted for 3 h, cooled to room temperature, centrifuged, washed with DMF solution three times, and dried at 80 ° C for 12 h to obtain the Fe-MOFs material;

[0051] Step 2. Fully wash the Fe-MOFs obtained in Step 1 with DMF solution, and dry at a temperature of 75-85°C for 12-24 h, and set aside;

[0052] Step 3, ultrasonically disperse the Fe-MO...

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Abstract

The invention provides a lithium-sulfur battery positive electrode material which comprises a hollow positive electrode carrier material, namely cobalt-iron double hydroxide and sulfur particles filled in the carrier material. The preparation method comprises the following steps: preparing a precursor Fe-MOFs material through a solvothermal method, and then drying the prepared Fe-MOFs material; dispersing the Fe-MOFs material in an absolute ethyl alcohol solution, dissolving a cobalt source and urea in deionized water, mixing the two solutions, and heating in a water bath for a certain time toobtain a Co-Fe LDH material; and compounding nano sulfur with the prepared Co-Fe LDH material to obtain a Co-Fe LDH@S composite positive electrode material. According to the preparation method of a hollow-structure lithium-sulfur battery positive electrode carrier Co-Fe LDH material, the prepared Co-Fe LDH@S composite positive electrode material can be directly applied to the field of energy storage materials, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] Lithium-sulfur batteries, as a new generation of lithium-ion battery systems that are expected to be industrialized, have extremely high theoretical energy densities (2600 Wh kg -1 ) and excellent theoretical specific capacity (1675 mAh g -1 ). As the positive part of lithium-sulfur batteries, sulfur is abundant in the earth, non-polluting, and environmentally friendly. Therefore, lithium-sulfur batteries have attracted the attention of a large number of researchers. However, there are still some problems that limit the development and industrialization of lithium-sulfur batteries. Such as 1) active material sulfur and discharge product Li 2 S and Li 2 S 2 The electronic / ionic conductivity of the ions is very poor, which causes the pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/62H01M4/628H01M10/052Y02E60/10
Inventor 魏慧洁任凤章柳勇熊毅陶枫李孝森马俊卿柳竞
Owner HENAN UNIV OF SCI & TECH
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