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Preparation method of laminated porous nitride micro-sheet/S composite positive electrode material

A composite positive electrode material and nitride technology, applied in the field of materials, can solve the problem of low sulfur loading, achieve high sulfur loading, excellent electrochemical performance, and high stacking density

Inactive Publication Date: 2020-08-28
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sulfur loading capacity of the current nitride sulfur carrier is low, at 3 mg cm -2 Below, this is because the structures of these nitrides are nanowires, nanofibers, nanosheets, etc., and there is not enough room for more sulfur

Method used

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  • Preparation method of laminated porous nitride micro-sheet/S composite positive electrode material
  • Preparation method of laminated porous nitride micro-sheet/S composite positive electrode material
  • Preparation method of laminated porous nitride micro-sheet/S composite positive electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Preparation of stacked oxides

[0032] Dissolve 0.324g of ammonium metavanadate powder in 30mL of ethanol aqueous solution, wherein the volume ratio of ethanol to water in the ethanol aqueous solution is 1:9, then add dilute hydrochloric acid to the alcohol solution of ammonium metavanadate to adjust the pH value to 2, fully stirred to make it evenly dispersed, poured into the reaction kettle, added iron-cobalt-nickel alloy wire and reacted at 160°C for 4 hours; after the reaction, filtered by suction and dried at 60°C to obtain V 2 o 5 laminated microsheets;

[0033] (2) Preparation of laminated porous nitride

[0034] Will make the V 2 o 5 The laminated microsheets were put into a tube furnace for nitriding, and kept at 600°C for 2h in an ammonia atmosphere. Take it out of the tube furnace when the temperature is lowered to room temperature, and the VN laminated porous material is obtained.

[0035] (3) Preparation of laminated porous nitride / S composites

...

Embodiment 2

[0038] (1) Preparation of stacked oxides

[0039] Dissolve 0.628g of ammonium metavanadate powder in 30mL of ethanol aqueous solution, wherein the volume ratio of ethanol and water in the ethanol aqueous solution is 1:3, then add dilute hydrochloric acid to the alcohol solution of ammonium metavanadate to adjust the pH value to 1, fully stirred to make it evenly dispersed, poured into a reaction kettle, added iron-cobalt-nickel alloy wire and reacted at 180°C for 3 hours; after the reaction, filtered by suction and dried at 60°C to obtain V 2 o 5 laminated microsheets.

[0040] (2) Preparation of laminated porous nitride

[0041] Will make the V 2 o 5 The laminated microsheets were put into a tube furnace for nitriding, and kept at 500°C for 2h in an ammonia atmosphere. Take it out of the tube furnace when the temperature is lowered to room temperature, and then obtain the VN stacked multilayer porous sheet-like structure material.

[0042] (3) Preparation of laminated p...

Embodiment 3

[0045] (1) Preparation of stacked oxides

[0046] First, 0.324g of ammonium metavanadate powder is dissolved in 50mL of ethanol aqueous solution, wherein the volume ratio of ethanol and water in the ethanol aqueous solution is 1:5), then dilute hydrochloric acid is added to the alcohol solution of ammonium metavanadate to adjust When the pH value reaches 4, stir well to make it evenly dispersed, pour it into the reaction kettle, add iron-cobalt-nickel alloy sheet and react at 140°C for 8 hours; after the reaction, filter it with suction and dry it at 60°C to obtain V 2 o 5 laminated microsheets.

[0047] (2) Preparation of laminated porous nitride

[0048] Will make the V 2 o 5 The laminated microsheets were put into a tube furnace for nitriding, and kept at 600 °C for 1 h in an ammonia atmosphere. Take it out of the tube furnace when the temperature is lowered to room temperature, and then obtain the VN stacked multilayer porous sheet-like structure material.

[0049] (...

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Abstract

The invention discloses a preparation method of a laminated porous nitride micro-sheet / S composite positive electrode material. The preparation method comprises the following steps: S1, dissolving a metal salt in an alcoholic solution, regulating the mixed solution to be acidic by using a strong acid, fully stirring, adding a template, and obtaining a laminated oxide micro-sheet by using a hydrothermal method; S2, nitriding the laminated oxide micro-sheet obtained in step S1 in a tubular furnace; and S3, mixing the nitride obtained by nitriding in step S2 with sulfur to carry out sulfur fixation, thereby preparing the laminated porous nitride micro-sheet / S composite positive electrode material. Abundant intercommunicated pore structures of the laminated porous nitride micro-sheet are utilized, so a large amount of sulfur storage space is provided, excellent electrical conductivity, strong sulfur fixation capacity and efficient catalytic activity of the nitride are also provided, cooperation of high sulfur loading capacity and high sulfur utilization rate is achieved, and a sulfur positive electrode with high stacking density, high sulfur surface loading capacity and high energy density is constructed.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of positive electrode materials. Background technique [0002] Large-scale electric energy storage systems represented by electric vehicles and modern power grids require advanced battery systems with long life and high energy density. Lithium-sulfur batteries have a high theoretical specific capacity (1675mAh g -1 ), high energy density (2600Wh Kg -1 ), low cost, and environmental friendliness, it is considered to be the most potential new generation energy solution. However, due to the sulfur cathode and the discharge product (Li 2 S 2 / Li 2 Poor electrical conductivity of S), excessive dissolution of polysulfides during charge and discharge, and “shuttle effect” lead to poor cycle stability and rate performance, as well as bottleneck issues such as low sulfur utilization, especially for low sulfur loading The amount seriously restricts ...

Claims

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Application Information

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IPC IPC(8): C01B21/06C01B21/076C01B17/02H01M4/36H01M4/38H01M4/62H01M10/052
CPCC01B17/0243C01B21/0617C01B21/062C01B21/076C01P2002/72C01P2004/03C01P2004/20C01P2004/80C01P2006/40H01M4/362H01M4/38H01M4/624H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 刘瑞卿刘文慧卜雅丽刘志伟杨威威王成林秀婧马延文
Owner NANJING UNIV OF POSTS & TELECOMM
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