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Preparation method and application of niobium diselenide as electrode material of sodium-ion battery

A sodium-ion battery, niobium diselenide technology, which is applied in the fields of energy storage materials and chemical power sources, can solve the problems of battery capacity attenuation, microstructure damage of electrode materials, and limited application scope.

Pending Publication Date: 2019-08-13
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For such materials, during the charging and discharging process, due to the destruction of the electrode material microstructure caused by the electrode volume expansion, the battery capacity will rapidly decay, thus limiting its application range.

Method used

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  • Preparation method and application of niobium diselenide as electrode material of sodium-ion battery
  • Preparation method and application of niobium diselenide as electrode material of sodium-ion battery
  • Preparation method and application of niobium diselenide as electrode material of sodium-ion battery

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Experimental program
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Effect test

Embodiment 1

[0027] Mix 1g of niobium powder and 2g of selenium powder evenly by dry ball milling for 4 hours, sinter in a tube furnace under argon atmosphere, heat up to 650°C at a rate of 5°C / min and keep at constant temperature for 2h , naturally cooled to room temperature to obtain the product sodium ion battery electrode material niobium diselenide.

Embodiment 2

[0029] 0.93g of niobium powder and 1.975g of selenium powder were mixed evenly by manual grinding, the mixing time was 2h, and sintering was carried out in a tube furnace under vacuum, and the temperature was raised to 750°C at a rate of 10°C / min and kept at a constant temperature for 3h. Cool naturally to room temperature to obtain the product niobium diselenide, an electrode material for sodium ion batteries.

[0030] figure 1 It is the XRD spectrum of the niobium diselenide material, as can be seen from the figure, the peak position of the XRD spectrum of the material is well consistent with the peak position and peak intensity on the standard card (JCPDS No.72-0864), indicating that the preparation The composition of the resulting material is phase-pure NbSe2.

[0031] figure 2 It is the 1st, 2nd and 10th charge and discharge curves of niobium diselenide material. As shown in the figure, there are similar curves in the discharge process of different cycles, that is, an ...

Embodiment 3

[0035] Mix 1.1g of niobium powder and 2.2g of selenium powder uniformly by magnetic force for 2 hours, sinter in a tube furnace under argon atmosphere, raise the temperature to 800°C at a rate of 15°C / min and keep it at a constant temperature for 10h , naturally cooled to room temperature to obtain the product sodium ion battery electrode material niobium diselenide.

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Abstract

The invention discloses a reparation method and application of niobium diselenide as an electrode material of a sodium-ion battery. The method comprises the steps that a selenium source and a niobiumsource are uniformly mixed and sintered at the specific temperature under a non-oxidizing atmosphere or in vacuum, and after natural cooling, the pure-phase niobium diselenide material is prepared. The material has the advantages of low investment, simple preparation technology processes and devices, convenient operation, high product purity, good safety performance and the like. When applied to the electrode material of the sodium-ion battery, the prepared niobium diselenide material is excellent in cycling stability performance and rate capability.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials and chemical power sources, and in particular relates to a preparation method and application of niobium diselenide, an electrode material of a sodium ion battery. Background technique [0002] As an indispensable part of new energy systems, people's requirements for energy storage devices continue to increase. Since the discovery of lithium-ion secondary batteries, due to the advantages of high energy density, long cycle life, and small self-discharge phenomenon, they have received great attention and developed rapidly. With the large-scale application of lithium-ion secondary batteries, the price of lithium cobalt oxide has been rising year by year. Due to the characteristics of large reserves of sodium resources, wide distribution, and easy extraction, sodium-ion batteries can be used as one of the alternatives to lithium-ion batteries. Due to the radius of the sodium ion l...

Claims

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Application Information

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IPC IPC(8): C01B19/00H01M4/58H01M10/054
CPCC01B19/007H01M4/581H01M10/054C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 王保峰吴茜凯田剑莉亚许贝贝
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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