Carbon Disulfide Cosolvent Electrolytes for High-Performance Lithium Sulfur Batteries

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• 作者：Sui Gu ; Zhaoyin WenRong Qian ; Jun Jin ; Qingsong Wang ; Meifen Wu ; Shangjun Zhuo
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：December 21, 2016
• 年：2016
• 卷：8
• 期：50
• 页码：34379-34386
• 全文大小：639K
• ISSN：1944-8252

文摘

Development of lithium sulfur (Li–S) batteries with high Coulombic efficiency and long cycle stability remains challenging due to the dissolution and shuttle of polysulfides in electrolyte. Here, a novel additive, carbon disulfide (CS₂), to the organic electrolyte is reported to improve the cycling performance of Li–S batteries. The cells with the CS₂-additive electrolyte exhibit high Coulombic efficiency and long cycle stability, showing average Coulombic efficiency >99% and a capacity retention of 88% over the entire 300 cycles. The function of the CS₂ additive is 2-fold: (1) it inhibits the migration of long-chain polysulfides to the anode by forming complexes with polysulfides and (2) it passivates electrode surfaces by inducing the protective coatings on both the anode and the cathode.