Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 3, Pages 2961-2969Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b17376
Keywords
niobium nitride; polysulfide trapping; chemical absorption; electrocatalytic conversion; lithium-sulfur batteries
Funding
- National Natural Science Foundation of China [51572100, 21875080, 61434001, 51504171]
- Major Project of Technology Innovation of Hubei Province [2018AAA011]
- Wuhan Yellow Crane Talents Program
- HUST Key Interdisciplinary Team Project [2016JCTD101]
- Hong Kong Research Grants Council (RGC) General Research Funds (GRF) [CityU 11205617]
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Lithium-sulfur (Li-S) batteries are promising next-generation energy storage devices because of their high energy density of 2600 Wh kg(-1). Efficient immobilization and fast conversion of soluble lithium polysulfide intermediates (LiPSs) are crucial to the electrochemical performance of Li-S batteries. Herein, we report a novel strategy to simultaneously achieve large capacity, high rate capability, and long cycle life by utilizing mesoporous niobium nitride microspheres/N-doped graphene nanosheets (NbN@NG) hybrids as multifunctional host materials for sulfur cathodes. The mesoporous NbN microspheres chemically immobilize LiPSs via Nb-S chemical bonding and catalytically promote conversion of LiPSs into insoluble Li2S resulting in enhanced redox reaction kinetics. Moreover, the highly conductive NbN and N-doped graphene nanosheets provide rapid electron transport and consequently, the S/NbN@NG cathode demonstrates a large capacity of 948 mAh g(-1) at 1C (1C = 1650 mA g(-1)), high rate capability of 739 mAh g(-1) at 5C, and excellent cycle stability with a capacity decay of 0.09% per cycle for over 400 cycles. The results described here provide insights into the design of multifunctional host materials for high-performance Li-S batteries.
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