Systematic Effect for an Ultralong Cycle Lithium鈥揝ulfur Battery

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• 作者：Feng Wu ; Yusheng Ye ; Renjie Chen ; Ji Qian ; Teng Zhao ; Li Li ; Wenhui Li
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：November 11, 2015
• 年：2015
• 卷：15
• 期：11
• 页码：7431-7439
• 全文大小：840K
• ISSN：1530-6992

文摘

Rechargeable lithium鈥搒ulfur (Li鈥揝) batteries are attractive candidates for energy storage devices because they have five times the theoretical energy storage of state-of-the-art Li-ion batteries. The main problems plaguing Li鈥揝 batteries are poor cycle life and limited rate capability, caused by the insulating nature of S and the shuttle effect associated with the dissolution of intermediate lithium polysulfides. Here, we report the use of biocell-inspired polydopamine (PD) as a coating agent on both the cathode and separator to address these problems (the 鈥渟ystematic effects鈥?. The PD-modified cathode and separator play key roles in facilitating ion diffusion and keeping the cathode structure stable, leading to uniform lithium deposition and a solid electrolyte interphase. As a result, an ultralong cycle performance of more than 3000 cycles, with a capacity fade of only 0.018% per cycle, was achieved at 2 C. It is believed that the systematic modification of the cathode and separator for Li鈥揝 batteries is a new strategy for practical applications.