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Carbon-selenium composite material, preparation method thereof, and application thereof in lithium-selenium battery

A technology of composite materials and two-dimensional carbon materials, which is applied in the field of carbon-selenium composite materials and its preparation, can solve the problems of limited raw material sources and harsh preparation methods

Inactive Publication Date: 2020-07-07
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to improve the deficiencies of the prior art, the present invention aims at the problems of limited raw material sources and harsh preparation methods in current lithium-selenium battery cathode materials, and develops a mild and easier-to-achieve preparation method with high selenium loading

Method used

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  • Carbon-selenium composite material, preparation method thereof, and application thereof in lithium-selenium battery
  • Carbon-selenium composite material, preparation method thereof, and application thereof in lithium-selenium battery
  • Carbon-selenium composite material, preparation method thereof, and application thereof in lithium-selenium battery

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preparation example Construction

[0038] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0039] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0041] (1) Preparation of carbon-selenium composite materials

[0042] After grinding 4g of soluble starch and 6g of potassium oxalate, they were calcined at 900°C for 5h under an inert atmosphere, cooled to room temperature, and washed with dilute hydrochloric acid until neutral. Filtrate and dry to obtain a two-dimensional carbon nanomaterial; the two-dimensional carbon material and the ethanol solution of selenium with a concentration of 1mol / L are evenly stirred, wherein the two-dimensional carbon material and selenium are mixed according to a mass ratio of 30:70, and heated to the solvent Heat treatment after volatilization, and raise the temperature of the dried mixture to 240°C at a rate of 5°C / min for 15 hours under certain conditions; after cooling to room temperature, a carbon-selenium composite material is obtained, wherein the loading amount of selenium is 70wt%.

[0043] (2) Preparation of positive electrode sheet

[0044] The carbon-selenium composite material p...

Embodiment 2

[0054] Other conditions are the same as in Example 1, except that the raw material for carbonization is corn leaf, and the loading amount of simple selenium in the carbon-selenium composite material obtained by the method described in Experimental Example 2 is 70wt%. The battery test results are summarized in Table 1.

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Abstract

The invention provides a carbon-selenium composite material, a preparation method thereof, and an application of the same in a lithium-selenium battery. Compared with the prior art, in the preparationmethod of the carbon-selenium composite material, the two-dimensional carbon material is wide in raw material source, simple and easy to obtain, so that the preparation method is simple, the practical degree is high, and the obtained carbon-selenium composite material shows excellent electrochemical performance. The two-dimensional carbon material is prepared by adopting a one-step hydrothermal reaction; the two-dimensional carbon material contains rich micro-mesoporous structures and has a high graphitization degree, so that when the two-dimensional carbon material and selenium are subjectedto low-temperature compounding and activation to obtain the carbon-selenium composite material, elemental selenium in the carbon-selenium composite material is uniformly loaded in micro-mesopores inthe surface of the two-dimensional carbon material, and the loading rate reaches up to 80%; as a result, the carbon-selenium composite material is used as a positive electrode material to be assembledto obtain the lithium-selenium battery with electrochemical stability.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and in particular relates to a carbon-selenium composite material, a preparation method thereof and an application in a lithium-selenium battery. Background technique [0002] With the continuous development of new renewable energy, the demand for energy storage is increasing, so the development of electrochemical energy storage systems with high energy density, long life and safety will be one of the important directions for the development of next-generation high-efficiency energy storage devices . Due to its high product energy density (3254Wh L -1 ) has attracted much attention. However, for electrochemical energy storage devices that pursue fast charging and discharging, it is very important to improve the conductivity of the cathode material of lithium-selenium batteries. At present, the common method is to load the active substance selenium on the conductive carbon material...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/625H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 曾宪祥王泓睿吴雄伟史梦钰谭彬马强邓奇
Owner HUNAN AGRICULTURAL UNIV
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