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Copper sulphide/graphene composite material for negative electrode of sodium-ion battery and preparation method

A technology for sodium ion batteries and composite materials, which is applied in the field of copper sulfide/graphene composite materials for sodium ion battery negative electrode materials and its preparation, can solve the problems of difficult rate performance, electrode material damage, specific capacity decay, etc., and achieve cycle Excellent performance and rate performance, high specific capacity, and simple preparation method

Active Publication Date: 2016-09-21
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When copper sulfide is used as an electrode material for lithium-ion batteries, it also faces similar problems with other metal sulfide electrodes, such as capacity fading during cycling and unsatisfactory rate performance.
However, there are few reports on the use of copper sulfide for sodium-ion batteries. Since the radius of sodium ions is much larger than that of lithium ions, the problem of specific capacity fading in sodium-ion batteries will only become more obvious.
On the one hand, due to the damage to the electrode material due to volume expansion during charging and discharging

Method used

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  • Copper sulphide/graphene composite material for negative electrode of sodium-ion battery and preparation method
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  • Copper sulphide/graphene composite material for negative electrode of sodium-ion battery and preparation method

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Experimental program
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Effect test

Embodiment 1

[0019] First, the modified Hummer method was used to prepare graphite oxide, that is, a 250mL reaction bottle was assembled in an ice-water bath, 120mL of concentrated sulfuric acid with a mass fraction of 98% was added, and a solid mixture of 2 g of graphite powder and 1 g of sodium nitrate was added under magnetic stirring. Then slowly add 6 g of potassium permanganate, control the reaction temperature not to exceed 10 °C, take it out after stirring in an ice bath for 2 h, and stir and react at room temperature for 5 d. The sample was then treated with 5% H 2 SO 4 The solution was diluted, and after stirring for 2 h, 6 mL of H 2 o 2 , the solution turned bright yellow, stirred for 2 h and centrifuged. Then use the mass fraction of 2% H 2 SO 4 、H 2 o 2 The mixed solution and 1% HCl were washed repeatedly, and finally washed several times with distilled water to make the pH about 7, and the obtained yellow-brown solution was graphite oxide.

[0020] In the second step,...

Embodiment 2

[0023] The copper sulfide / graphene composite material prepared in Example 1, the binder sodium carboxymethylcellulose and the conductive agent Super-P are dispersed in deionized water at a mass ratio of 80:10:10 to make a slurry, and evenly coated on A circular electrode with a diameter of 14mm is made on a 9μm thick copper foil after drying. Using sodium metal as the reference electrode and counter electrode, and Whatman GF / D as the separator, a CR2032 button cell was assembled in a glove box with water and oxygen content less than 0.5ppm. The 1M sodium perchlorate used was dissolved in a mixed solvent of ethylene carbonate and ethyl methyl carbonate (mass ratio 1:1), and 5% fluoroethylene carbonate was added as the electrolyte. The CR2032 button battery was charged and discharged at a constant current (0.4-2.6V) by the blue electric battery tester CT2001A, and the electrochemical performance of the copper sulfide / graphene composite material was tested.

[0024] image 3 Th...

Embodiment 3

[0026] The rate performance was tested at different current densities of 100mA / g, 250mA / g, 500mA / g, and 1000mA / g with the CR2032 button cell assembled in Example 2. Figure 4 The rate performance of the prepared copper sulfide / graphene composites at different current densities. When the current density is 1000mA / g, its specific capacity still reaches 375mAh / g, and when the current density returns to 100mA / g, its capacity can return to 400mAh / g, showing super superior rate performance.

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Abstract

The invention discloses a copper sulphide / graphene composite material for a negative electrode of a sodium-ion battery and a preparation method. Copper sulphide in the composite material is evenly dispersed into graphene in a 10-80nm flake form; the mass percent of the copper sulphide is 50%-95%; and the graphene is synthesized by a chemical method. The preparation method of the composite material comprises the following steps: mixing CuSO4.5H2O and thioacetamide into a solution and then adding a graphite oxide solution; and obtaining the composite material under a microwave-assisted solvothermal or hydrothermal reaction condition. The composite material has the advantages of high initial coulomb efficiency, high specific capacity, excellent cycle performance and rate capability, long cycle life and the like when used as the negative electrode of the sodium-ion battery; the preparation method is simple; the cost is low; and industrial scale production is easy to implement.

Description

technical field [0001] The invention relates to the technical field of anode materials for sodium-ion batteries, in particular to a copper sulfide / graphene composite material for anode materials for sodium-ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are currently widely used in mobile electronic devices such as mobile phones. With the rapid popularization of electric vehicles and the proposal of large-scale grid energy storage, people's demand for lithium is also growing rapidly, and the corresponding limited reserves and high price of lithium in the earth's crust have also aroused people's concerns. Because sodium has similar physical and chemical properties to lithium, is abundant in the earth's crust, is widely distributed, and is cheap, sodium-ion batteries are regarded as one of the potential important substitutes for lithium-ion batteries and have recently gained attention. widespread attention. The performance ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M4/1397H01M10/054
CPCH01M4/136H01M4/1397H01M4/362H01M4/5815H01M4/625H01M10/054Y02E60/10
Inventor 张孝杰潘丽坤秦伟陆婷
Owner EAST CHINA NORMAL UNIV
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