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Composite cathode material for sodium battery and preparation method of composite cathode material

A negative electrode material and sodium battery technology, applied in the field of electrochemistry, can solve the problems of low sodium storage capacity and poor cycle stability, and achieve the effects of alleviating volume expansion, low cost, and improving cycle stability and rate performance

Inactive Publication Date: 2016-04-20
DONGGUAN WEISHENG ENERGY STORAGE TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the current negative electrode materials for sodium ion batteries, such as low sodium storage capacity and poor cycle stability, the present invention provides a composite negative electrode material with high theoretical specific capacity and good battery cycle stability and a preparation method thereof

Method used

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  • Composite cathode material for sodium battery and preparation method of composite cathode material
  • Composite cathode material for sodium battery and preparation method of composite cathode material
  • Composite cathode material for sodium battery and preparation method of composite cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 Solvothermal method:

[0041] Add sodium lauryl sulfate to 70ml of water and stir to dissolve, add tin tetrachloride and sodium sulfide calculated according to the stoichiometric ratio to the above solution, stir and dissolve fully, and add glucose pyrolytic carbon as a carbon source. After the solution is fully mixed, move it into a polytetrafluoroethylene-lined hydrothermal kettle for hydrothermal reaction at 120-240°C for 10-24 hours. After the reaction kettle was cooled, the product was centrifuged and washed to obtain tin sulfide-carbon composite material powder, and the scanning electron microscope photos were as follows: figure 1 .

Embodiment 2

[0042] Embodiment 2 liquid phase-solid phase method:

[0043] Dissolve sulfur powder in 30ml carbon disulfide and add carbon nanotubes as a carbon source and mix thoroughly to obtain a black suspension. Add dibutyl tin diacetate to the above suspension according to the stoichiometric ratio and mix well, evaporate carbon disulfide to dryness to obtain a viscous substance. Heat the viscous material at 200-700°C for 1-10 hours, and obtain a tin sulfide-carbon composite material after cooling. The scanning electron microscope photo is as follows: figure 2 .

[0044] Table 1

[0045]

[0046]The tin sulfide-carbon composite material obtained in Example 1 is made into a negative pole of a sodium ion battery, and the counter electrode adopts a sodium sheet, and the electrolytic solution is 1mol / L sodium hexafluorophosphate dissolved in EC, DEC (1:1 volume ratio), Assembled into a battery, at 100mA / cm 2 Test the cycle performance under the current density, such as image 3 , ...

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Abstract

The invention relates to a composite cathode material for a sodium battery and a preparation method of the composite cathode material. The preparation method comprises the steps that tin salt, a sulphur source and a carbon source are added to a solvent to be mixed; a heating reaction is carried out, or the solvent is evaporated out, then the heating reaction is carried out in the inertia protective atmosphere, or the heating reaction is firstly carried out, and then solids are separated out to be heated in the inertia protective atmosphere; SnS and / or SnS2 and a conductive composite product of a carbon material are obtained through the reaction. By means of the method, the problem about volume expansion of a sodium-tin alloying reaction is effectively relieved, and the circulating stability and rate capability of the material are improved.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a composite negative electrode material for a sodium battery and a preparation method thereof. Background technique [0002] With the rapid development of social economy, energy and environmental issues have become increasingly prominent worldwide. Changing the existing energy structure and vigorously developing renewable energy have become the primary issues facing the sustainable development of human society. Lithium batteries have the advantages of high energy density, high operating voltage, wide operating temperature range, and no memory effect. So far, they have rapidly occupied almost the entire market of mobile electronic devices, and are rapidly developing into the fields of electric vehicles and energy storage. One of the most promising green power sources. However, the poor lithium resources (only 0.006% in the earth's crust) will not be able to meet the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/38H01M10/05
CPCH01M4/134H01M4/387H01M10/05Y02E60/10
Inventor 蒋凯王康丽李浩秒黎朝晖陈金玲周敏
Owner DONGGUAN WEISHENG ENERGY STORAGE TECH CO LTD
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