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Tellurium sulfide polyacrylonitrile cathode material and preparation method thereof

A technology of tellurium sulfide polyacrylonitrile and positive electrode materials, which is applied in battery electrodes, electrical components, circuits, etc., can solve the problems of low discharge potential and poor rate performance, and achieve improved conductivity, reduced polarization, and high discharge potential Effect

Inactive Publication Date: 2019-05-17
中国人民解放军军事科学院防化研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low discharge potential and poor rate performance of the positive material of vulcanized polyacrylonitrile, and provide a novel secondary battery positive electrode material-tellurium vulcanized polyacrylonitrile and its preparation method

Method used

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  • Tellurium sulfide polyacrylonitrile cathode material and preparation method thereof
  • Tellurium sulfide polyacrylonitrile cathode material and preparation method thereof

Examples

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example 1

[0022] Weigh 2 g of tellurium powder and 100 g of sublimed sulfur, grind them evenly, heat them in a tube furnace to 450° C. and keep them warm for 10 hours to obtain tellurium sulfide. Weigh 24g of tellurium sulfide, 3g of nickel sulfide and 6g of polyacrylonitrile, grind them evenly, heat them in a tube furnace at 350°C and keep them warm for 5 hours to obtain tellurium sulfide polyacrylonitrile, the material has a tellurium content of 2.1%, and a sulfur content of was 47.5%. Under the current density of 100mA / g, the average discharge voltage is 1.92V, the stable cycle capacity of the material reaches 660mAh / g, and the average coulombic efficiency is more than 99%.

example 2

[0024] Weigh 12 g of tellurium powder and 100 g of sublimed sulfur, grind them evenly, heat them in a tube furnace to 450° C. and keep them warm for 10 hours to obtain tellurium sulfide. Weigh 24g of tellurium sulfide, 4g of lanthanum oxide and 6g of polyacrylonitrile, grind them evenly, heat them in a tube furnace at 350°C and keep them warm for 5 hours to prepare tellurium sulfide polyacrylonitrile, see attached figure 1 , the material tellurium content is 3.2%, and the sulfur content is 46.8%. Under the current density of 100mA / g, the average discharge voltage is 1.93V, the stable cycle capacity of the material reaches 650mAh / g, and the average Coulombic efficiency is >99%, see attached figure 2 .

example 3

[0026] Weigh 12 g of tellurium powder and 100 g of sublimed sulfur, grind them evenly, heat them in a tube furnace to 450° C. and keep them warm for 10 hours to obtain tellurium sulfide. Add 10 g of acrylonitrile into 500 g of DMF, stir to dissolve, add 0.02 g of azobisisobutyronitrile, and react for 3 hours under the protection of nitrogen to obtain polyacrylonitrile. Add 24g of tellurium sulfide and 3g of nickel sulfide to the reaction solution, stir evenly, filter, remove DMF, and dry to obtain a mixture containing tellurium sulfide, nickel sulfide and polyacrylonitrile. The above mixture was heated to 300° C. in a tube furnace and kept for 5 hours to obtain a tellurium sulfide polyacrylonitrile positive electrode material. The material has a tellurium content of 3.3% and a sulfur content of 48.3%. At a current density of 100mA / g, the stable cycle capacity of the material reaches 680mAh / g.

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Abstract

The invention relates to a tellurium sulfide polyacrylonitrile cathode material and a preparation method thereof. The preparation method comprises the following steps: commonly heating the vulcanizingagent and telluride agent to prepare tellurium sulfide, commonly heating the polyacrylonitrile, the tellurium sulfide and the catalyst to prepare the tellurium sulfide polyacrylonitrile cathode material. A main chain of the novel cathode composite material obtained through the method is carbon chain containing nitrogen atoms, the side chain is tellurium atoms or sulfur atoms; the adding of the tellurium improves the conductivity of the sulfide polyacrylonitrile cathode material, and the polarization is reduced, and the high discharging level and the excellent rate capability are acquired. Thecharging / discharging is performed on the 100mA / g current density, the average discharging potential of the material is 1.92V and more, the stable cycling capacity can reach 650mAh / g and more. The tellurium sulfide polyacrylonitrile cathode material has important promoting effect for the practicability of the lithium-sulfur battery.

Description

technical field [0001] The invention relates to a lithium-sulfur battery cathode material and a preparation method thereof, belonging to the field of chemical power sources. Background technique [0002] With the growth of the world's population and the rapid development of the economy, energy consumption is also increasing. Therefore, the development and utilization of green and clean energy has become an important issue. Due to its high specific capacity (1675mAh g -1 ) and abundant sulfur reserves in nature, and is considered to be one of the most promising chemical power sources. However, the active material of lithium-sulfur battery has poor conductivity, and the intermediate product polysulfide in the charging and discharging process is easy to dissolve and diffuse in the electrolyte, and has a side reaction with the negative metal lithium, resulting in a "shuttle effect", which eventually leads to a rapid decline in battery cycle performance. Low Coulombic efficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60
CPCY02E60/10
Inventor 王珂王安邦王维坤金朝庆祝夏雨关越鹏黄雅钦
Owner 中国人民解放军军事科学院防化研究院
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