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Cobalt selenide/carbon sodium ion battery composite negative electrode material as well as preparation method and application of cobalt selenide/carbon-sodium ion battery composite negative electrode material

A technology of sodium ion battery and negative electrode material, applied in battery electrodes, non-aqueous electrolyte storage batteries, circuits, etc., can solve the problems of synthesis method, performance and application difference, low ionic conductivity and electronic conductivity, and the invention has not yet been reported. , to achieve the effect of environmental friendliness, reducing electrode capacity decay and increasing conductivity

Active Publication Date: 2016-07-20
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

However, selenide materials have low ionic conductivity and electronic conductivity, and tend to spontaneously agglomerate in practical applications, resulting in difficulties in intercalation and deintercalation of sodium ions. Therefore, it is necessary to improve the design of material structures and synthesis methods
Though, there is the report of synthesizing cobalt selenide material before this, but its synthetic method, performance and purposes all differ from the present invention to some extent, and the invention about cobalt selenide / carbon high-performance sodium ion battery negative electrode material has not yet been reported

Method used

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  • Cobalt selenide/carbon sodium ion battery composite negative electrode material as well as preparation method and application of cobalt selenide/carbon-sodium ion battery composite negative electrode material
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  • Cobalt selenide/carbon sodium ion battery composite negative electrode material as well as preparation method and application of cobalt selenide/carbon-sodium ion battery composite negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Weigh 0.587g of cobalt nitrate and 0.32g of selenium powder into a beaker filled with 40ml of deionized water, then mix the selenium source solution and cobalt source solution evenly, then add 0.1g of graphite flakes to the In the mixed solution, after ultrasonication for 2 hours, a dispersion liquid was obtained. The dispersion liquid was put into a reaction kettle, and a hydrothermal reaction was carried out at a temperature of 200° C. for 20 hours. The hydrothermal reaction product is separated from solid to liquid, washed with water and alcohol for 3 times, dried in a vacuum oven at 60°C, and heat-treated at 300°C for 1 hour under a nitrogen protective atmosphere to obtain cobalt selenide / carbon Composite anode materials for sodium ion batteries. X-ray powder diffraction (XRD) analysis shows that the obtained product is cobalt selenide with cubic crystal structure, without any other impurity phases, and has high crystallinity (such as figure 1 shown). It can ...

Embodiment 2

[0030] (1) Weigh 0.5g of cobalt acetate and 0.69g of sodium selenosulfate into a beaker containing 40ml of ethanol, then mix the selenium source solution and cobalt source solution evenly, then add 0.05g of carbon nanotubes Into the mixed solution, ultrasonic 5h, to obtain a dispersion. The dispersion liquid was put into a reaction kettle, and hydrothermally reacted at a temperature of 180°C for 30 hours. Separate the solid-liquid of the hydrothermal reaction product, wash the obtained solid three times with water and alcohol respectively, dry it in a vacuum drying oven at 70°C, and heat-treat at 350°C for 2 hours under a nitrogen protective atmosphere to obtain cobalt selenide / sodium carbon Composite anode materials for ion batteries. XRD analysis shows that the obtained product is cobalt selenide with cubic crystal structure, without any other impurity phase, and has high crystallinity. It can be seen from the SEM image that the composite material is a graphene-coated nano...

Embodiment 3

[0033](1) Weigh 0.53g of cobalt sulfate and 0.32g of sodium selenite into a beaker filled with 40ml of dimethylformamide, then mix the selenium source solution and cobalt source solution evenly, and then add 0.3g of Glucose was added to the mixed solution, and a dispersion was obtained after ultrasonication for 0.5 h. The dispersion liquid was put into a reaction kettle, and hydrothermally reacted at a temperature of 220° C. for 15 hours. The hydrothermal reaction product was separated from solid to liquid, washed three times with water and alcohol respectively, dried in a vacuum oven at 80°C, and heat-treated at 400°C for 3 hours under a nitrogen protective atmosphere to obtain cobalt selenide / carbon Composite anode materials for sodium ion batteries. XRD analysis shows that the obtained product is cobalt selenide with cubic crystal structure, without any other impurity phase, and has high crystallinity. It can be seen from the SEM image that the composite material is a gra...

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Abstract

The invention discloses a cobalt selenide / carbon sodium ion battery composite negative electrode material as well as a preparation method and application of the cobalt selenide / carbon-sodium ion battery composite negative electrode material. Cobalt selenide nano rods in a cobalt selenide / carbon composite material uniformly grow on the surface of carbon. The preparation method of the composite negative electrode material comprises the following steps: (1) preparing a selenium source and a cobalt source, which are uniformly dispersed; (2) after uniformly mixing the selenium source and the cobalt source, adding a carbon source, and carrying out ultrasonic treatment on a mixed solution; putting the mixed solution into a reaction kettle and carrying out a hydrothermal reaction; (3) filtering and washing, and drying in vacuum; carrying out heat treatment under a protection atmosphere to obtain the cobalt selenide / carbon sodium ion battery composite negative electrode material. The cobalt selenide / carbon composite material prepared by the method is good in dispersity and is of a uniform nano-rod-shaped structure; the cobalt selenide / carbon composite material is used as a sodium ion battery negative electrode material and has higher charge and discharge capacity, good rate performance and circulating stability. The cobalt selenide / carbon sodium ion battery composite negative electrode material has the advantages of simple method, easiness of obtaining the raw materials, high repeatability and no pollution, and has a very wide application prospect in the field of sodium ion batteries.

Description

technical field [0001] The invention belongs to the field of electrode materials for sodium ion secondary batteries, in particular to a cobalt selenide (CoSe 2 ) / carbon sodium ion battery composite anode material and its preparation method and application. Background technique [0002] As lithium-ion batteries are widely used in many fields such as portable equipment, mobile power supplies, electric vehicles, storage power stations, etc., the demand for lithium-ion batteries has increased sharply. However, limited lithium resources and high lithium prices greatly limit the large-scale application of lithium-ion batteries. Sodium is extremely abundant (the sixth most abundant element in the earth's crust), and the raw material is cheap. Therefore, replacing lithium-ion batteries with sodium-ion batteries will likely solve the problem of large-scale energy storage, and sodium-ion batteries with high specific energy and high specific power will have broad application prospect...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M10/05
CPCH01M4/364H01M10/05Y02E60/10
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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