Rational Design of Cathode Structure for High Rate Performance Lithium鈥揝ulfur Batteries

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• 作者：Hongwei Chen ; Changhong Wang ; Yafei Dai ; Shengqiang Qiu ; Jinlong Yang ; Wei Lu ; Liwei Chen
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：August 12, 2015
• 年：2015
• 卷：15
• 期：8
• 页码：5443-5448
• 全文大小：481K
• ISSN：1530-6992

文摘

Practical applications of Li鈥揝 batteries require not only high specific capacities and long cycle lifetimes but also high rate performance. We report a rationally designed Li鈥揝 cathode, which consists of a freestanding composite thin film assembled from S nanoparticles, reduced graphene oxide (rGO), and a multifunctional additive poly(anthraquinonyl sulfide) (PAQS). The S nanoparticles provide a high initial specific capacity, and the layered and porous rGO structure provides electron and ion transport paths and restricts polysulfide shuttling. PAQS is not only a highly efficient sulfide trapping agent but also an excellent Li⁺ conductor, which benefits the battery reaction kinetics at a high rate. The resulting cathode exhibits an initial specific capacity of 1255 mAh g^鈥? with a decay rate as low as 0.046% per cycles over 1200 cycles. Importantly, it displays a reversible capacity of 615 mAh g^鈥? when discharged at a high rate of 8 C (13.744 A g^鈥?).