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Nickel selenide/graphene sodium ion battery composite negative material as well as preparation method and application thereof

A technology of sodium ion battery and negative electrode material, applied in the field of electrochemistry, can solve the problems of poor electrical conductivity, too fast specific capacity decay, etc., and achieve the effects of low cost, improved structural stability, and uniform dispersion.

Active Publication Date: 2016-05-25
广东容钠新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the shortcomings of the current traditional carbon-based negative electrode materials for sodium-ion batteries, such as poor electrical conductivity and rapid decay of specific capacity during battery charging and discharging cycles, the present invention proposes a nickel selenide (NiSe 2 ) / graphene sodium ion battery negative electrode material and its preparation method and application, which can improve the structural stability and electrochemical performance of the sodium ion battery negative electrode material, and improve the cycle performance and rate performance of the material in the charge and discharge process

Method used

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  • Nickel selenide/graphene sodium ion battery composite negative material as well as preparation method and application thereof
  • Nickel selenide/graphene sodium ion battery composite negative material as well as preparation method and application thereof
  • Nickel selenide/graphene sodium ion battery composite negative material as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0030] (1) Weigh 0.586g of nickel nitrate (Ni(NO 3 ) 2 6H2O) and 0.1 g of graphene were added to 80 ml of deionized water, and after ultrasonication for 2 hours, a dispersion liquid was obtained. The dispersion obtained above was uniformly mixed with 0.32 g of selenium powder, and subjected to a hydrothermal reaction at 200° C. for 20 h. The hydrothermal reaction product is separated from the solid and liquid, and the obtained solid is washed three times with water and alcohol respectively, and dried in a vacuum oven at 60°C to obtain nickel selenide / graphene sodium with a nickel selenide content of 76.91wt%. Composite anode materials for ion batteries. X-ray powder diffraction (XRD) analysis shows that the obtained product is pure nickel selenide without any other impurity phases and high crystallinity (such as figure 1 shown). It can be seen from the Raman spectrum that at a displacement of 1350cm -1 D peaks appear on the left and right, with a displacement of 1600cm -...

Embodiment 2

[0033] (1) Weigh 0.526g of nickel sulfate (NiSO 4 ·6H 2 O) 0.15 g of graphene was added to 80 ml of pure ethanol, and ultrasonicated for 5 hours to obtain a dispersion. The dispersion obtained above was uniformly mixed with 0.32 g of selenium powder, and subjected to hydrothermal reaction at 180° C. for 30 h. The hydrothermal reaction product was separated from solid to liquid, and the obtained solid was washed three times with water and alcohol, and dried in a vacuum oven at 90°C to obtain a nickel selenide / graphene sodium ion battery with a nickel selenide content of 65.36 wt%. Composite anode materials. Further XRD and Raman spectrogram analysis showed that the composition of the prepared nickel selenide / graphene composite material was similar to that of Example 1, consisting of nickel selenide and graphene. It can be seen from the SEM image that graphene is uniformly wrapped on the surface of octahedral nano-nickel selenide particles, with a particle size of 200-300nm. ...

Embodiment 3

[0036] 1) Weigh 0.586g of nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O) 0.1 g of graphene was added to 80 ml of pure methanol, and after ultrasonication for 1 hour, a dispersion was obtained. The dispersion obtained above was uniformly mixed with 0.44 g of selenium dioxide, and subjected to a hydrothermal reaction at a temperature of 160° C. for 40 h. The hydrothermal reaction product was separated from solid to liquid, and the obtained solid was washed three times with water and alcohol, and dried in a vacuum oven at 60°C to obtain a nickel selenide / graphene sodium ion battery with a nickel selenide content of 76.91wt%. Composite anode materials. Further analysis of (XRD) spectrum and Raman spectrum shows that the result of the prepared nickel selenide / graphene composite material is similar to that of Example 1, and is composed of nickel selenide and graphene. It can be seen from the SEM image that graphene is uniformly wrapped on the surface of octahedral nano-nickel selenide par...

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Abstract

The invention discloses a nickel selenide / graphene sodium ion battery composite negative material as well as a preparation method and application thereof. The composite material is formed by compounding nanoscale nickel selenide and graphene, wherein the nickel selenide is in an octahedral block shape, and the content of the nickel selenide is 60 to 90 percent of the mass of the nickel selenide / graphene sodium ion battery composite negative material. The preparation method comprises the steps: preparing a nickel source dispersed with graphene, mixing the nickel source and a selenium source, performing a hydrothermal reaction, filtering, washing, and drying in vacuum to obtain a needed product. The prepared nickel selenide / graphene sodium ion battery composite negative material is stable in structure, good in conducting performance and excellent in rate capability and cycling stability when used as a sodium ion battery negative material. The method is low in cost, relatively low in energy consumption, convenient in control, friendly to the environment, suitable for the real application of a sodium ion battery and capable of realizing the industrialized mass production.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a nickel selenide / graphene sodium ion battery negative electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are gradually replacing nickel-cadmium batteries and nickel-metal hydride batteries because of their high energy density, long service life, and environmental protection requirements, and have become the preferred power source for portable devices such as mobile phones and notebooks, electric vehicles, and smart grids. With the rapid popularization of portable electronic devices and the rapid development of electric vehicles, the demand for lithium-ion batteries continues to increase. However, the low reserves of lithium sources and the high price of lithium raw materials have greatly restricted the development of lithium-ion batteries. However, due to the many advantages of Na sources, such as ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/054
CPCH01M4/362H01M4/58H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 杨成浩李姣欧星熊训辉刘美林
Owner 广东容钠新能源科技有限公司
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