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Nickel bicarbonate/graphene composite material for negative electrode of sodium-ion battery as well as preparation method and application of nickel bicarbonate/graphene composite material

A sodium-ion battery, nickel bicarbonate technology, applied in the field of electrochemistry, can solve the problems of large volume change, poor specific capacity, unstable structure, etc., and achieve the effects of improving specific capacity, good rate and cycle, and stable product quality.

Active Publication Date: 2017-11-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three-dimensional graphene-based composite electrode prepared by the invention does not contain any conductive agent and binder, and is first prepared by chemical vapor deposition and then by hydrothermal method; but the steps are relatively cumbersome, and the prepared material is used for sodium For ion batteries, the specific capacity is not good
However, there is no report on the application of nickel bicarbonate to the anode material of sodium-ion batteries.
However, nickel bicarbonate as a negative electrode material for sodium-ion batteries may have the disadvantages of large volume changes during cycling, resulting in structural instability and low conductivity.

Method used

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  • Nickel bicarbonate/graphene composite material for negative electrode of sodium-ion battery as well as preparation method and application of nickel bicarbonate/graphene composite material
  • Nickel bicarbonate/graphene composite material for negative electrode of sodium-ion battery as well as preparation method and application of nickel bicarbonate/graphene composite material
  • Nickel bicarbonate/graphene composite material for negative electrode of sodium-ion battery as well as preparation method and application of nickel bicarbonate/graphene composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0049] A nickel bicarbonate / graphene composite material for a negative electrode of a sodium ion battery, the composite material is a composite powder material of nickel bicarbonate and graphene, and the mass content of nickel bicarbonate in the composite powder material is 92%.

[0050] The preparation method of the nickel bicarbonate / graphene composite material for the negative electrode of the above-mentioned sodium ion battery comprises the steps as follows:

[0051] 6 mg of graphene oxide was ultrasonically dispersed in 35 mL of deionized water, then 1 mmol of nickel chloride and 0.2 g of ascorbic acid were added, stirred at room temperature for 15 minutes, and finally 5 mL of ammonium carbonate aqueous solution (1 mol L -1 ), mixed evenly, transferred to a 50mL polytetrafluoroethylene reactor, and reacted at a temperature of 160°C for 5 hours. The obtained product was washed and dried in air at 80° C. for 6 hours to obtain a nickel bicarbonate / graphene composite material...

Embodiment 2

[0055] A kind of preparation method of nickel bicarbonate / graphene composite material for sodium ion battery negative pole, comprises steps as follows:

[0056] Take 6 mg of graphene oxide and ultrasonically disperse it in 35 mL of deionized water, then add 2 mmol of nickel chloride and 0.2 g of ascorbic acid, stir at room temperature for 15 minutes, and finally add 5 mL of ammonium carbonate aqueous solution (1 mol L -1 ), mixed evenly, transferred to a 50mL polytetrafluoroethylene reactor, and reacted for 3 hours at a temperature of 180°C. The obtained product was washed and dried in air at 80° C. for 6 hours to obtain a nickel bicarbonate / graphene composite material.

Embodiment 3

[0058] A kind of preparation method of nickel bicarbonate / graphene composite material for sodium ion battery negative pole, comprises steps as follows:

[0059] Take 6 mg of graphene oxide and ultrasonically disperse it in 35 mL of deionized water, then add 3 mmol of nickel acetate and 0.2 g of glucose, stir at room temperature for 15 minutes, and finally quickly add 5 mL of ammonium carbonate aqueous solution (1molL -1 ), mixed evenly, transferred to a 50mL polytetrafluoroethylene reactor, and reacted at a temperature of 160°C for 5 hours. The obtained product was washed and dried in air at 80° C. for 6 hours to obtain a nickel bicarbonate / graphene composite material.

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Abstract

The invention provides a nickel bicarbonate / graphene composite material for a negative electrode of a sodium-ion battery as well as a preparation method and application of the nickel bicarbonate / graphene composite material. A nickel bicarbonate / graphene composite material is prepared through taking graphene oxide, divalent nickel salt, a reducing agent and water-soluble carbonate or urea as raw materials and adopting a hydrothermal method. The composite material provided by the invention has a uniform size and is applied to a sodium-ion negative electrode; the composite material has relatively good electrochemical performance and has excellent rate performance and circulating stability. Furthermore, the preparation method has strong operability and good repeatability and the quality of an obtained product is stable.

Description

technical field [0001] The invention relates to a nickel bicarbonate / graphene composite material for a negative electrode of a sodium ion battery, a preparation method and application thereof, and belongs to the technical field of electrochemistry. Background technique [0002] Compared with lithium-ion batteries, sodium-ion batteries have the advantages of abundant sodium resources and low raw material prices, and have great application prospects in the field of large-scale energy storage. The anode material of sodium ion battery, as one of the important components of the battery, has an important impact on its performance. At present, the sodium storage anode materials with intercalation mechanism have received more attention due to their high cycle stability, mainly including hard carbon, Na 2 Ti 3 o 7 and Li 4 Ti 5 o 12 Wait. Among these sodium storage anode materials, Na 2 Ti 3 o 7 and Li 4 Ti 5 o 12 The specific capacity is usually less than 200mAh g -1 ,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/587H01M4/62H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M4/587H01M4/625H01M10/054Y02E60/10
Inventor 顾鑫赵学波闫春柳代鹏程李良军刘丹丹
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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