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Sodium ion battery zinc sulfide based negative electrode material and preparation method thereof

A technology for sodium ion batteries and negative electrode materials, applied in battery electrodes, batteries, electrochemical generators, etc., can solve problems such as safety hazards, battery explosions, uneven deposition, etc., and achieve improved conductivity, high sodium storage capacity, and excellent The effect of the conductive network

Inactive Publication Date: 2015-08-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Sodium metal is a completely electrochemically reversible material for sodium ions. It has the characteristics of negative electrode potential and high energy density. It is an ideal choice for the negative electrode material of sodium ion batteries; Uneven deposition produces dendrites that penetrate the separator, causing an internal short circuit in the battery and causing an explosion, which poses a huge safety hazard

Method used

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  • Sodium ion battery zinc sulfide based negative electrode material and preparation method thereof
  • Sodium ion battery zinc sulfide based negative electrode material and preparation method thereof
  • Sodium ion battery zinc sulfide based negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Stir and dissolve 19.75g of zinc acetate dihydrate in 500ml of dimethylformamide (DMF), stir and dissolve 5.98g of terephthalic acid (BDC) in 400ml of DMF and add 8.52ml of triethylamine, mix the two solutions Stir magnetically at 20°C for 6h, obtain the precipitate by centrifugation, soak and wash with DMF, dichloromethane, and DMF in turn, and soak for 6h each time, and finally pre-dry the product at 60°C, and then vacuum at 150°C After drying for 12 hours, a zinc-based metal-organic framework was obtained. The product was calcined for 2 hours under nitrogen atmosphere, the calcining temperature was 600° C., and the heating rate was 2° C. / min.

[0042] Weigh 0.1g calcined zinc sulfide / porous carbon composite material and 0.2g thioacetamide to disperse in the mixed solution of 20ml ethylene glycol, 20ml deionized water, transfer the mixed solution to a 60ml reactor and seal it at 180 Reaction at ℃ for 24h. After the reaction, the reaction kettle was placed in the air...

Embodiment 2

[0049] Stir and dissolve 19.75g of zinc acetate dihydrate in 500ml of dimethylformamide (DMF), stir and dissolve 5.98g of terephthalic acid (BDC) in 400ml of DMF and add 8.52ml of triethylamine, mix the two solutions Stir magnetically at 20°C for 8 hours, obtain the precipitate by centrifugation, soak and wash with DMF, dichloromethane, and DMF in sequence, and soak for 6 hours each time, and finally pre-dry the product at 60°C, and then vacuum at 150°C After drying for 18 hours, the Zn-based metal-organic framework was obtained. The product was calcined for 2 hours under nitrogen atmosphere, the calcining temperature was 600° C., and the heating rate was 5° C. / min.

[0050] Weigh 0.1g calcined zinc sulfide / porous carbon composite material and 0.2g thiourea and disperse in 40ml ethylene glycol, transfer the solution to a 60ml reactor, seal it and react at 180°C for 18h. After the reaction, the reactor was cooled in the air, and the cooled reaction solution was suction-filtere...

Embodiment 3

[0052] Stir and dissolve 19.75g of zinc acetate dihydrate in 500ml of dimethylformamide (DMF), stir and dissolve 5.98g of terephthalic acid (BDC) in 400ml of DMF and add 8.52ml of triethylamine, mix the two solutions Stir magnetically at 20°C for 6h, obtain the precipitate by centrifugation, soak and wash with DMF, dichloromethane, and DMF in turn, and soak for 6h each time, and finally pre-dry the product at 60°C, and then vacuum at 150°C Dry for 12h. The dried MOF-5 was calcined for 2 hours under nitrogen atmosphere, the calcination temperature was 650°C, and the heating rate was 5°C / min.

[0053] Weigh 0.1g calcined zinc sulfide / porous carbon composite material and 0.4g sodium sulfide nonahydrate and disperse in a mixed solution of 20ml ethylenediamine and 20ml deionized water, transfer the mixed solution to a 60ml reactor and seal it at 120 Reaction at ℃ for 24h. After the reaction, the reactor was cooled in the air, and the cooled reaction solution was suction-filtered,...

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Abstract

The invention discloses a preparation method of a sodium ion battery zinc sulfide based negative electrode material. A zinc based metal organic framework acts as a precursor of the negative electrode material, and is prepared by adopting a solvent heat vulcanization method, wherein zinc sulfide nano particles are dispersed into a porous carbon framework via in-situ assembly, and the mass percentage content of zinc sulfide is 70-90%. The material as the negative electrode material of the sodium ion battery shows the characteristics of high specific capacity and good cycling stability, and the preparation method is simple and easy to operate, is environmentally friendly, and is low in cost.

Description

technical field [0001] The invention relates to a zinc sulfide-based negative electrode material for a sodium ion battery and a preparation method thereof, belonging to the field of sodium ion batteries. Background technique [0002] In recent years, with the vigorous development and wide application of lithium-ion batteries, the disadvantages of less lithium content and uneven distribution have become increasingly prominent. Sodium is rich in content and widely distributed around the world, and has very similar physical and chemical properties to lithium. The theoretical specific capacity of sodium alone reaches 1165mA h g -1 , and compared to the lithium potential of +0.3V, sodium has a relatively large advantage in terms of storage capacity and price of sodium resources. In recent years, relevant scientific research workers have found that sodium-ion batteries exhibit performance close to that of lithium-ion batteries, and are considered to be an ideal choice for replaci...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M4/1393H01M4/48H01M4/583
CPCH01M4/133H01M4/136H01M4/364H01M4/5815H01M4/583H01M2220/10H01M2220/20Y02E60/10
Inventor 张治安付云甘永青杨幸
Owner CENT SOUTH UNIV
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