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Anode material and manufacturing method thereof and lithium-sulfur battery

A positive electrode material and a positive electrode technology, applied in the field of positive electrode materials and their preparation, and lithium-sulfur batteries, can solve the problems of reducing the cycle stability of lithium-sulfur batteries, reducing the cycle stability of lithium-sulfur batteries, and poor cycling stability of lithium-sulfur batteries, etc. Good cycle stability, improved cycle stability, low cost effect

Inactive Publication Date: 2019-02-19
桑德新能源技术开发有限公司 +1
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Problems solved by technology

However, the existing matrix materials have the following defects: (1) low porosity and weak sulfur storage capacity, resulting in poor cycle stability of lithium-sulfur batteries; (2) three-dimensional porous carbon materials, graphene and its derivatives, etc. Carbon materials, the ability to adsorb polysulfur lithium compounds produced during the charging process of lithium-sulfur batteries is weak, and there will still be more polysulfur lithium compounds dissolved in the electrolyte, which will reduce the cycle stability of lithium-sulfur batteries
[0005] Among them, C 3 N 4 This carbon-nitrogen material is used as a matrix material for loading sulfur, and the N element contained in it can adsorb polysulfur lithium compounds, but due to its relatively high nitrogen content, its intrinsic conductivity is reduced, which will reduce the cycle stability of lithium-sulfur batteries. sex

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  • Anode material and manufacturing method thereof and lithium-sulfur battery

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Embodiment approach

[0039] According to one embodiment of the cathode material of the present invention, the porous C 3 N 4-x The porosity is 20-30m 2 / g.

[0040] Porous C in the positive electrode material of the present invention 3 N 4-x The porosity is 20~30m 2 / g, while plain C 3 N 4 The porosity is only 9m 2 / g or so, so the positive electrode material of the present invention has a strong sulfur storage capacity, and the lithium ion battery using the positive electrode material of the present invention has good cycle performance.

[0041] According to another aspect of the present invention, a kind of preparation method of cathode material is provided, comprising steps:

[0042] S1: C containing holes3 N 4 Mixed with Mg, heated and reacted for a certain period of time to obtain porous C 3 N 4-x , where, 0

[0043] S2: in C containing pores 3 N 4-x Sulfur is loaded in the medium to obtain the positive electrode material.

[0044] The preparation method of the present inv...

Embodiment 1

[0071] In the preparation method of the positive electrode material of this embodiment, the C containing pores is first prepared 3 N 4 , the pore-containing C was obtained by mixing and heating thiourea and ammonium chloride 3 N 4 ; The mass ratio of thiourea to ammonium chloride is 1:1; the heating temperature is 500-600°C, and the heating time is 1-5h.

[0072] Then proceed to step S1: the obtained C containing pores 3 N 4 Mixed with Mg powder, heated and reacted for a certain period of time to obtain porous C 3 N 4-x , where, 03 N 4 The mass ratio of magnesium powder and magnesium powder is 3:1; the heating temperature is 600°C, and the reaction time is 1-5h; after the reaction is completed, wash with dilute acid and deionized water; the concentration of dilute acid is 0.5-1.5mol / L sulfuric acid or hydrochloric acid.

[0073] Finally, step S2 is performed: in the hole-containing C 3 N 4-xSulfur is loaded in the medium to obtain the positive electrode material. C ...

Embodiment 2

[0075] The other conditions of embodiment 2 and embodiment 1 are all the same, and the difference is that no ammonium chloride is added in embodiment 2.

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Abstract

The invention discloses an anode material and a manufacturing method thereof and a lithium-sulfur battery. The anode material comprises porous C3N4-X, wherein 0<x<4; and sulfur loaded in C3N4-X. The manufacturing method of the anode material includes the following steps: S1. mixing porous C3N4 with Mg, and heating and reacting for a certain time to obtain the porous C3N4-X, wherein 0<x<4; S2. loading sulfur in the porous C3N4-X to obtain the anode material. According to the anode material, on one hand, due to C3N4-X comprises nitrogen, which has good adsorption performance for polysulfide lithium; on the other hand, due to the nitrogen content in C3N4-X is lower than C3N4, and the intrinsic conductivity is improved compared with C3N4, therefore, when the anode material is used in the lithium-sulfur battery, the cycle stability of the lithium-sulfur battery can be improved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a positive electrode material, a preparation method thereof, and a lithium-sulfur battery. Background technique [0002] Lithium-ion batteries play a dominant role in energy storage and have become an indispensable part of modern life due to their relatively mature preparation process and high stability. Due to the capacity mismatch between the positive and negative electrodes of lithium-ion batteries, the theoretical density of traditional lithium-ion batteries is limited, which limits its application in hybrid electric vehicles and large smart grids. In addition, factors such as high cost, high toxicity and unsafety also hinder its further development. [0003] As a new generation of batteries, lithium-sulfur batteries have attracted more and more researchers' attention due to their better theoretical energy density. In addition, due to the low cost, environmental protection and high...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/364H01M4/38H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 霍晓梅苗力孝石朝辉柯菲
Owner 桑德新能源技术开发有限公司
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