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Citation: WANG Wei-Kun, WANG An-Bang, CAO Gao-Ping, YANG Yu-Sheng. Preparation and Electrochemical Performance of Carbyne Polysulfide as a Cathode Material for Lithium Batteries[J]. Chinese Journal of Applied Chemistry, ;2005, 22(4): 367-371. shu

Preparation and Electrochemical Performance of Carbyne Polysulfide as a Cathode Material for Lithium Batteries

1.
R & D Center of Military Power Sources, Chemical Defence Institute, Beijing 100083

Corresponding author: WANG Wei-Kun,
Received Date: 14 July 2004
Available Online: 10 November 2004
Fund Project: 国家"八六三"项目(2001AA320301)资助 (2001AA320301)

The cathode material of lithium/sulfur rechargeable batteries,sulfur,exhibits poor conductivity,and its dischange product is partially soluble,leading to capacity decay during cycling.To mitigate these problems,we proposed to design the cathode material with a conducting skeleton and energy-storing side chains,and prepared a novel material carbyne polysulfide.The products obtained by co-heating carbon containing carbyne moieties and element sulfur were characterized by elemental analysis,¹³C NMR,Raman,and DSC/TG,and the product obtained at 300℃ was proved to have a sp² hybride carbon skeleton with polysulfide attached on it,which resembles the theoretical structure of carbyne polysulfide.This material exhibits a high capacity of 773 mA·h/g at 400 mA/g and a stable reversible capacity of 350 mA·h/g after 50 cycles.The good performance of this cathode material under swift discharge condition and its good cycling properties indicate the success of our new design principle.
- lithium battery,
- carbyne polysulfide,
- cathode material
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