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Preparation method of cobalt-vanadium sulfide and application of cobalt-vanadium sulfide as sodium-ion battery negative electrode material

A sodium-ion battery and sulfide technology, applied in the direction of vanadium compounds, cobalt compounds, battery electrodes, etc., can solve the problems of large volume expansion, poor cycle performance, etc., achieve high rate performance, improve cycle life, and controllable composition

Pending Publication Date: 2022-08-05
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material can effectively solve the problem of poor cycle performance and large volume expansion of the negative electrode material of the sodium ion battery, improve the cycle stability of the battery, and provide a simple and effective preparation method for the negative electrode material of the sodium ion battery

Method used

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  • Preparation method of cobalt-vanadium sulfide and application of cobalt-vanadium sulfide as sodium-ion battery negative electrode material
  • Preparation method of cobalt-vanadium sulfide and application of cobalt-vanadium sulfide as sodium-ion battery negative electrode material
  • Preparation method of cobalt-vanadium sulfide and application of cobalt-vanadium sulfide as sodium-ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 0.5mmol CoCl 2 ·6H 2 O, 0.5 mmol VCl 3 , 15mmol of urea and 2.5mmol of TAA were added to deionized water, and after magnetic stirring was uniform, the mixed solution was transferred to the substrate of a polytetrafluoroethylene reactor, and further reacted at a high temperature of 120 ° C for 24h, the slurry was filtered through a microporous membrane, Water and ethanol are repeatedly washed to remove impurities, and the final product is dried in an oven overnight, and the solid is ground to obtain the final cobalt vanadium sulfide electrode material.

[0026] The cobalt vanadium sulfide electrode material prepared in Example 1 was characterized by SEM and electrochemical performance test. from figure 1 The detection results show that the prepared cobalt-vanadium sulfide material is a nano-flower formed by stacking a lamella structure, and the thickness of the lamella is about 20-50 nanometers. Depend on figure 2 It can be seen that the prepared cobalt vanadium su...

Embodiment 2

[0028] 0.75mmol CoCl 2 ·6H 2 O, 0.25 mmol VCl 3 , 15mmol urea, 2.5mmol TAA were added into deionized water, and after magnetic stirring was uniform, the mixed solution was transferred to the substrate of the polytetrafluoroethylene reactor, and further reacted at a high temperature of 120 ℃ for 8h, the slurry was filtered through a microporous membrane, Water and ethanol are repeatedly washed to remove impurities, and the final product is dried in an oven overnight, and the solid is ground to obtain the final cobalt vanadium sulfide electrode material.

Embodiment 3

[0030] 0.5mmol CoCl 2 ·6H 2 O, 0.5 mmol VCl 3 , 30 mmol urea, 1 mmol TAA were added to deionized water, and after magnetic stirring was uniform, the mixed solution was transferred to the substrate of a polytetrafluoroethylene reactor, and further reacted at a high temperature of 160 ° C for 24 h, the slurry was filtered through a microporous membrane, and the water Repeated washing with ethanol to remove impurities, the final product is dried in an oven overnight, and the solid is ground to obtain the final cobalt vanadium sulfide electrode material.

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Abstract

The invention belongs to the field of new-generation energy materials, and particularly relates to a preparation method of cobalt-vanadium sulfide and application of the cobalt-vanadium sulfide as a sodium-ion battery negative electrode material. The preparation method comprises the following steps: uniformly mixing and stirring a salt solution of metal Co and V, urea and thioacetamide (TAA), transferring into a polytetrafluoroethylene reaction kettle substrate, and carrying out hydrothermal treatment to obtain the cobalt-vanadium sulfide. The preparation method disclosed by the invention is simple in process and low in cost, and the prepared negative electrode material has the advantages of high energy density, good cycle performance, excellent rate capability and the like when being used for the sodium-ion battery, and has a wide application prospect in the field related to energy storage.

Description

technical field [0001] The invention belongs to the field of new-generation energy storage, and particularly relates to a preparation method of cobalt vanadium sulfide and its application as a negative electrode material for sodium ion batteries. Background technique [0002] At present, the world is at the starting point of the energy revolution, the concept of global carbon neutrality has become a consensus, and energy production and storage technologies are increasingly attracting the attention of researchers. With the wide application of lithium-ion batteries in the field of electric vehicles, the disadvantages of insufficient resources and high cost have gradually emerged, which also prompted researchers to find a lithium substitute as soon as possible. Considering the similar physical and chemical properties to lithium, high safety and lower operating voltage, the earth's abundant and low-cost sodium has re-entered the attention of researchers. Compared with commercia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00C01G31/00B82Y30/00B82Y40/00H01M4/136H01M4/58H01M10/054
CPCC01G51/006C01G51/30C01G31/00H01M4/58H01M4/5815H01M4/136H01M10/054B82Y30/00B82Y40/00C01P2002/72C01P2004/03C01P2006/40C01P2004/64C01P2004/82Y02E60/10
Inventor 蔡玉荣马佳慧武军代俊杰董洋涛马潇雨陆梓枫
Owner ZHEJIANG SCI-TECH UNIV
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