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Sulfur selenide vanadium copper solid solution preparation method, negative electrode material and sodium ion battery

A technology of sulfur selenide and sulfur vanadium copper, which is applied in chemical instruments and methods, battery electrodes, secondary batteries, etc., can solve the problems of high synthesis cost and long synthesis time, and achieve low cost, short time and low temperature Effect

Pending Publication Date: 2022-07-08
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Without exception, these synthesis methods have the disadvantages of long time and high synthesis cost.

Method used

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  • Sulfur selenide vanadium copper solid solution preparation method, negative electrode material and sodium ion battery
  • Sulfur selenide vanadium copper solid solution preparation method, negative electrode material and sodium ion battery
  • Sulfur selenide vanadium copper solid solution preparation method, negative electrode material and sodium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Example 1: Take 2g TEOA and add it to a beaker of 18mL distilled water, add 1mmol sodium orthovanadate, 0.5mmol copper chloride and 4mmol thioacetamide successively, stir magnetically for 3 hours to obtain a brown precipitate, and centrifuge the brown precipitate with ethanol for several times. The solid precipitation was obtained through the process, and the solid precipitation was separated and dried at 60° C. for 8 hours to obtain a brown powdery precursor of copper sulphur vanadium. Place 1 mole part of the precursor sulfur vanadium copper and 3 mole parts of selenium powder on both ends of the quartz boat to be flat, place the quartz boat in a sealed tube furnace, and calcine under the protection of nitrogen gas. The heating rate of min was raised from room temperature to 500 °C, maintained at 500 °C for 1 hour, and cooled to room temperature to obtain a solid solution of sulfide vanadium copper selenide.

[0049] The sulfur-vanadium-copper selenide solid solution ...

Embodiment 2

[0052] Example 2: The product obtained in Example 1 was tested in terms of battery performance. The assembly process was carried out in a glove box filled with high-purity argon. The water content and oxygen content were both lower than 0.1 ppm. The copper foil of copper sulfide vanadium is used as the positive electrode, the high-purity sodium sheet is used as the negative electrode, and the electrolyte is 1M NaCF 3 SO 3 in DIGLYME=100Vol%. After the battery was assembled, it was packaged in a glove box with a sealing machine, and the battery performance was tested after standing at room temperature for 6 hours. The test results show that: at 1Ag -1 At high current density, the capacity remains at 550mAhg after 1000 cycles -1 , the Coulombic efficiency reaches more than 98%, showing excellent cycle stability performance.

[0053] The steps in the method of the embodiment of the present invention may be adjusted, combined and deleted in sequence according to actual needs....

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Abstract

A preparation method of a sulfur-vanadium-copper selenide solid solution comprises the following steps: putting a sulfur-vanadium-copper precursor and excessive selenium powder in a closed reaction space protected by inert gas, calcining at a predetermined temperature system to obtain sulfur-vanadium-copper selenide, taking sulfur-vanadium-copper synthesized by hydrothermal reaction as a precursor, and selenizing the precursor to obtain the sulfur-vanadium-copper selenide solid solution. The method has the advantages of low required temperature, short time, low energy consumption, low cost and the like.

Description

technical field [0001] The invention relates to the technical field of battery material preparation, in particular to a preparation method of a sulfur vanadium copper selenide solid solution, a negative electrode material and a sodium ion battery. Background technique [0002] With the unprecedented development of society, the demand for energy in various countries is increasing day by day. Traditional fossil energy and resources can no longer meet the needs of modern human society. The use of new clean energy such as wind energy, solar energy, geothermal energy and tidal energy is largely restricted by conditions, so it is an important issue to develop certain energy storage devices to store these energy sources. Therefore, the basis for the use and development of new energy sources is the development of high-performance energy storage and conversion devices, namely chemical power sources. A sodium-ion battery is a kind of secondary rechargeable battery. Its working princ...

Claims

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Application Information

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IPC IPC(8): C01B19/00H01M4/58H01M10/054
CPCC01B19/002H01M4/58H01M10/054H01M2004/027C01P2002/72C01P2002/85C01P2006/40Y02E60/10
Inventor 梁军高明慧李莉
Owner NINGXIA UNIVERSITY
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