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A kind of cobalt carbonate/graphene composite material for sodium ion battery negative electrode and its preparation method and application

A sodium-ion battery and composite material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large particle size of cobalt carbonate, low conductivity, and high energy consumption.

Active Publication Date: 2021-04-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation process of the invention is simple and controllable, and has a stable small-rate cycle performance when using lithium half-cells; but this method uses organic solvents, which is not conducive to environmental protection; the reaction temperature and reaction time are long, and energy consumption is large; at the same time, the method The graphite oxide in the prepared material cannot be reduced well, and the particle size of cobalt carbonate is also relatively large
However, there is no report on the application of cobalt carbonate as a negative electrode material for sodium-ion batteries.
However, cobalt carbonate, as an anode 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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  • A kind of cobalt carbonate/graphene composite material for sodium ion battery negative electrode and its preparation method and application
  • A kind of cobalt carbonate/graphene composite material for sodium ion battery negative electrode and its preparation method and application
  • A kind of cobalt carbonate/graphene composite material for sodium ion battery negative electrode and its preparation method and application

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Embodiment 1

[0049] A kind of cobalt carbonate / graphene composite material for sodium ion battery negative pole, described composite material is the composite powder material of cobalt carbonate and graphene, and the mass content of cobalt carbonate is 88% in the described composite powder material; The particle size of cobalt is 1-2 μm.

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

[0051] Take 6 mg of graphene oxide and ultrasonically disperse it in 35 mL of deionized water, then add 1 mmol of cobalt chloride 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...

Embodiment 2

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

[0056] Take 6mg of graphene oxide and ultrasonically disperse it in 35mL of deionized water, then add 2mmol of cobalt chloride and 0.2g of ascorbic acid, stir at room temperature for 15 minutes, and finally add 5mL of ammonium carbonate aqueous solution (1molL -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 cobalt carbonate / graphene composite material.

Embodiment 3

[0058] A kind of preparation method of cobalt carbonate / 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 cobalt chloride and 0.2 g of ascorbic acid, stir at room temperature for 15 minutes, and finally quickly add 5 mL of ammonium carbonate aqueous solution (1mol 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 cobalt carbonate / graphene composite material.

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Abstract

The invention provides a cobalt carbonate / graphene composite material for a negative electrode of a sodium ion battery, a preparation method and an application thereof. The invention adopts a hydrothermal method and uses graphene oxide, divalent cobalt salt, reducing agent and water-soluble carbonate or urea as raw materials to prepare cobalt carbonate / graphene composite material. The composite material has a uniform size and is applied to a sodium ion negative electrode. It has good electrochemical performance, excellent rate performance and cycle stability. In addition, the preparation method of the invention has strong operability and good reproducibility, and the quality of the obtained product is stable.

Description

technical field [0001] The invention relates to a cobalt carbonate / 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 , i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/587H01M4/62H01M10/054
CPCH01M4/362H01M4/485H01M4/587H01M4/625H01M10/054Y02E60/10
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)