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NiSe2-CNT/S composite lithium-sulfur battery positive electrode material and preparation method thereof

A technology of cathode materials and composite materials, which is applied in the field of NiSe2-CNT/S composite lithium-sulfur battery cathode materials and its preparation, can solve the problems of high cost, low output, complex modification methods, etc., and achieve easy operation, low cost, The effect of suppressing the shuttle effect

Pending Publication Date: 2022-07-15
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Significant progress has been made in the modification of carbon materials, but due to the complexity of modification methods, low output, and high cost, there is still a long way to go before production and commercialization

Method used

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  • NiSe2-CNT/S composite lithium-sulfur battery positive electrode material and preparation method thereof
  • NiSe2-CNT/S composite lithium-sulfur battery positive electrode material and preparation method thereof
  • NiSe2-CNT/S composite lithium-sulfur battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A NiSe 2 -CNT / S composite lithium-sulfur battery cathode material, prepared by the following method:

[0034] Disperse 0.58g of nickel nitrate and 3g of urea in 70mL of deionized water, and ultrasonically stir until completely dissolved; then add 0.1g of CNT, stir for 15min, transfer it into the reaction kettle, and react at 100°C for 6h; after the reaction is completed, use ethanol and water for the product , centrifugally washed for 3-5 times, and then put into an oven to dry at 60°C; 0.15g of the dried product is weighed and mixed with 0.3g of selenium powder and ground evenly; then transferred to a tube furnace for calcination at 600°C for 2 hours to obtain NiSe 2 -CNT composite; then NiSe 2 - CNT composite material and sulfur powder are mixed in a mass ratio of 3:7 and ground evenly, and then annealed at 155 °C for 12 h in an argon atmosphere to obtain NiSe 2 -CNT / S lithium-sulfur battery cathode material.

[0035] After testing, the lithium-sulfur battery catho...

Embodiment 2

[0037] A NiSe 2 -CNT / S composite lithium-sulfur battery cathode material, prepared by the following method:

[0038]Disperse 1.16g of nickel nitrate and 3g of urea in 70mL of deionized water, and ultrasonically stir until completely dissolved; then add 0.2g of CNT, stir for 15min, transfer it into a reaction kettle, and react at 120°C for 6h; after the reaction is completed, use ethanol and water for the product , centrifugally washed 3-5 times, and then placed in an oven to dry at 60°C; 0.2g of the dried product was mixed with 0.6g of selenium powder and ground evenly; then transferred to a tube furnace for calcination at 600°C for 2 hours to obtain NiSe 2 -CNT composite; then NiSe 2 - CNT composite material and sulfur powder are mixed in a mass ratio of 3:7 and ground evenly, and then annealed at 155 °C for 12 h in an argon atmosphere to obtain NiSe 2 -CNT / S lithium-sulfur battery cathode material.

[0039] After testing, the lithium-sulfur battery cathode material obtain...

Embodiment 3

[0041] A NiSe 2 -CNT / S composite lithium-sulfur battery cathode material, prepared by the following method:

[0042] Disperse 1.16g of nickel nitrate and 3g of urea in 70mL of deionized water, and ultrasonically stir until completely dissolved; then add 0.1g of CNT, stir for 15min, transfer it into the reaction kettle, and react at 120°C for 6h; after the reaction is completed, use ethanol and water for the product , centrifugally washed 3-5 times, and then placed in an oven to dry at 60 °C; 0.3 g of the dried product was weighed and mixed with 0.6 g of selenium powder and ground evenly; then transferred to a tube furnace for calcination at 600 °C for 2 hours to obtain NiSe 2 -CNT composite; then NiSe 2 - CNT composite material and sulfur powder are mixed in a mass ratio of 3:7 and ground evenly, and then annealed at 155 °C for 12 h in an argon atmosphere to obtain NiSe 2 -CNT / S composite lithium-sulfur battery cathode material.

[0043] After testing, the lithium-sulfur ba...

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Abstract

The invention belongs to the technical field of preparation of lithium-sulfur battery electrode materials, and particularly relates to a NiSe2-CNT / S composite lithium-sulfur battery positive electrode material and a preparation method thereof. According to the positive electrode material, a carbon nano tube is used as a carbon-based material, NiSe2 nano particles are uniformly compounded on the carbon nano tube to form a NiSe2-CNT composite material, and elemental sulfur is loaded on the NiSe2-CNT composite material. The NiSe2-CNT composite material is synthesized by adopting a solvothermal method, and is used for a positive electrode of a lithium-sulfur battery after being subjected to sulfur loading. According to the prepared electrode material, the carbon nanotubes serve as a carbon-based material, NiSe2 nanoparticles are compounded, compared with a traditional electrode material, the electrode material has more excellent adsorbability and higher electron and ion transmission performance, and the cycling stability and the electrochemical performance are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrode materials for lithium-sulfur batteries, in particular to a NiSe 2 -CNT / S composite lithium-sulfur battery cathode material and preparation method thereof. Background technique [0002] Lithium-sulfur batteries have received extensive attention due to their high theoretical energy density and abundant cathode sulfur materials. However, the low conductivity of sulfur itself and the "shuttle effect" of polysulfides affect its practical application. Elemental sulfur and its discharge products (Li 2 S) has low electrical conductivity, and its low electrical conductivity will slow down the conversion power of sulfur, which in turn will lead to poor electrochemical performance of lithium-sulfur batteries; during the charging and discharging process of lithium-sulfur batteries, some high-order polysulfides It will be dissolved in the organic electrolyte, which will greatly increase the ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/364H01M4/625
Inventor 任慢慢王贺卢龙泉刘伟良杨铭志
Owner QILU UNIV OF TECH
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