Rational Design of Cathode Structure for High Rate Performance Lithium–Sulfur Batteries
- 9 July 2015
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 15 (8), 5443-5448
- https://doi.org/10.1021/acs.nanolett.5b01837
Abstract
Practical applications of Li-S batteries require not only high specific capacities and long cycle lifetimes but also high rate performance. We report a rationally designed Li-S 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(-1) with a decay rate as low as 0.046% per cycles over 1200 cycles. Importantly, it displays a reversible capacity of 615 mAh g(-1) when discharged at a high rate of 8 C (13.744 A g(-1)).Funding Information
- Chinese Academy of Sciences (XDA09010600)
- Natural Science Foundation of Jiangsu Province (BK20130006)
- National Natural Science Foundation of China (21273273, 21473242)
- Suzhou City (ZXJ2012002)
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