Selenium-doped ferrous disulfide carbon-coated composite material and preparation and application methods thereof

A technology of ferrous disulfide and composite materials, which is applied to elemental compounds other than selenium/tellurium, selenium/tellurium compounds, chemical instruments and methods, etc. effect, high specific capacity and rate capability, and the effect of improving electrochemical activity

Active Publication Date: 2019-03-08
中山高容新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reports on ferrous selenide in the field of energy storage are rare.

Method used

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  • Selenium-doped ferrous disulfide carbon-coated composite material and preparation and application methods thereof
  • Selenium-doped ferrous disulfide carbon-coated composite material and preparation and application methods thereof
  • Selenium-doped ferrous disulfide carbon-coated composite material and preparation and application methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A selenium-doped iron disulfide carbon-coated composite material, the composition of the composite material is FeSe x S 2-x @C, where x is 0.2, i.e. the composition of the composite is FeSe 0.2 S 1.8 @C.

[0045] A preparation method of the above-mentioned selenium-doped ferrous disulfide carbon-coated composite material, comprising the following steps:

[0046] S1, Preparation of selenium-doped ferrous disulfide

[0047] S1.1, Prepare the solution FeSO containing ferrous ions in the reactor 4 , ferrous ion concentration is 1.0mol / L; Add sulfur powder, selenium powder and carbon powder, wherein carbon powder content is 5% of solution, the mol ratio of control selenium powder and sulfur powder is 1:9, this solution is adjusted to Strongly alkaline.

[0048] S1.2, add 10% citric acid and ascorbic acid (the molar ratio of the two reducing agents is 1:1) as reducing agent and 8wt% ethylenediaminetetraacetic acid (EDTA) as chelating agent according to stoichiometric ex...

Embodiment 2

[0058] A selenium-doped iron disulfide carbon-coated composite material, the composition of the composite material is FeSe x S 2-x @C, where x is 1, i.e. the composition of the composite is FeSe 1 S 1 @C.

[0059] A preparation method of the above-mentioned selenium-doped ferrous disulfide carbon-coated composite material, comprising the following steps:

[0060] S1, Preparation of selenium-doped ferrous disulfide

[0061] S1.1, Prepare the solution FeSO containing ferrous ions in the reactor 4 , ferrous ion concentration is 1mol / L; Add sulfur powder, selenium powder and carbon powder, wherein carbon powder content is 5% of solution, the mol ratio of control selenium powder and sulfur powder is 1:1, this solution is adjusted to strong alkaline.

[0062] S1.2, add citric acid and ascorbic acid (the molar ratio of the two reducing agents is 1:1) as the reducing agent and 8wt% ethylenediaminetetraacetic acid (EDTA) as the chelating agent according to the stoichiometric exce...

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Abstract

The invention discloses a selenium-doped ferrous disulfide carbon-coated composite material. The composition of the selenium-doped ferrous disulfide carbon-coated composite material is FeSe*S2-*@C, wherein x is 0.1-1.9. When applied to sodium ion batteries, the selenium-doped ferrous disulfide carbon-coated composite material can effectively inhibit volume expansion effects and increase actual specific capacity, rate capability and cycling performance. The invention also discloses preparation and application methods of the selenium-doped ferrous disulfide carbon-coated composite material.

Description

technical field [0001] The invention relates to a selenium-doped ferrous disulfide carbon-coated composite material, and also relates to its preparation method and application. Background technique [0002] Sodium element is abundant and cheap (Na 2 CO 3 : 150 US dollars / ton), and sodium is the alkali metal element with the lowest density and the smallest ionic radius except lithium, making sodium-ion batteries the most promising new batteries. In recent research reports, the performance of anode materials for sodium-ion batteries has been comparable to that of cathode materials for lithium-ion batteries, including Na x MO 2 Quasi-cathode[1-2], Prussian blue-like cathode developed by Guo Yuguo's research group at the University of Chinese Academy of Sciences and Liao Xiaozhen's research group at Shanghai Jiaotong University[3-4], developed by Huang Yunhui's research group at Huazhong University of Science and Technology, Hu Xianluo's research group, and Wang Xianyou's r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00H01M4/58H01M4/62H01M10/054
CPCH01M4/5815H01M4/625H01M4/628H01M10/054C01B19/002C01P2004/80Y02E60/10
Inventor 韩东梅崔明谭建军吴春露刘轩黄思福
Owner 中山高容新能源科技有限公司
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