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- W3030618610 abstract "Increasing the sluggish redox reactions of soluble lithium polysulfides (LiPSs) and suppressing their shuttle effect are the key challenges for lithium-sulfur (Li–S) batteries with long-term cyclic stability. Herein, an integrated design of hollow carbon nanospheres filled by polar manganese oxide (δ-MnO2) nanoflakes (MnO2@HCS) as a sulfur host is proposed, in which the physical confinement and chemical interaction for LiPSs are successfully achieved simultaneously. In this architecture, the outer porous carbon shell can support the fast electron/ion transfer and serve as a physical barrier to confine the soluble LiPSs. Besides, the hollow architecture can accommodate the active sulfur and buffer its volume variation during cycling. Moreover, the inner polar MnO2 nanoflakes can trap and boost the redox reactions of LiPSs through thiosulfate-polythionate conversion leading to inhibited shuttle effect. Due to the unique synergistic encapsulations, the MnO2@HCS-S cathode achieves a high initial specific discharge capacity of 1250 mAh g−1, and exhibits a stable cyclic property maintaining 705 mAh g−1 after 500 cycles at 1.0C corresponding to an ultralow capacity decay of 0.078% per cycle. As a result, this proposed strategy will guide a new direction for the development of polar metal compounds with special architectures for advanced Li–S batteries." @default.
- W3030618610 created "2020-06-05" @default.
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- W3030618610 date "2020-11-01" @default.
- W3030618610 modified "2023-10-09" @default.
- W3030618610 title "Yolk-shell structure MnO2@Hollow carbon nanospheres as sulfur host with synergistic encapsulation of polysulfides for improved Li–S batteries" @default.
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- W3030618610 doi "https://doi.org/10.1016/j.jallcom.2020.155790" @default.
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