Journal
ACS APPLIED ENERGY MATERIALS
Volume 3, Issue 11, Pages 11206-11212Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c02141
Keywords
single atomic catalyst; lithium-sulfur batteries; electrochemical conversion kinetics; shuttling effect; atomic layer deposition
Funding
- Natural Science Foundation of Jiangsu Province [BK20170778]
- NSFC [21905134, U1802256, 21773118, 21875107]
- Prospective Joint Research Project of Cooperative Innovation Fund of Jiangsu Province [BE2018122]
- China Postdoctoral Science Foundation [2018M632300]
- Foundation of Graduation Innovation Center in NUAA [kfjj20190616, kfjj20190610]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Lithium-sulfur (Li-S) batteries have been considered as one of the most promising next-generation rechargeable battery technologies owing to the high theoretical energy density and the low cost of sulfur resources. However, the practical implementation of Li-S batteries is largely impeded by the sluggish conversion kinetics and the shuttling effect of soluble polysulfides intermediates bearing a long short cycling life and an inferior rate performance. Herein, single atomic cobalt-decorated free-standing CNT (CNT@SACo) films are prepared by the atomic layer deposition method and used as the multifunctional interlayer for high-performance Li-S batteries. Experimental results and theoretical calculations indicate that the CNT@SACo interlayer demonstrates catalytic activity to improve the electrochemical conversion kinetics of polysulfide and strengthen the affinity of cathode toward polysulfide. Consequently, the Li-S batteries with a CNT@SACo interlayer demonstrate a high capacity of 880 mAh g(-1) at a current density of 1C with a low capacity decay rate of 0.064% per cycle over 500 cycles. Even at a high current density of 2C, the battery still exhibits a high capacity of 641 mAh g(-1). Our work demonstrates a feasible and practical design approach for endowing nanomaterials with targeted functions for high-performance lithium batteries.
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