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- W3136754060 endingPage "129475" @default.
- W3136754060 startingPage "129475" @default.
- W3136754060 abstract "SeS2, a substitute to S with slightly lower theoretical capacity (1124 mAh g−1) but much improved electric conductivity, requires host with special design to alleviate shuttle effect, accommodate volume variation and ensure fast redox kinetics. Herein, a facile synthesis method via hydrothermal reaction was introduced to fabricate a 3D hierarchical structure composite with CoSe2 nano-particles uniformly distributed in mesoporous carbon nanosheets standing on carbon fiber cloth (marked as [email protected]2). As a whole substrate, the mesopores of [email protected]2 can physically restrain the intermediates migration and accommodate the volume variation, while the CoSe2 can chemically adsorb the intermediates and catalyze their conversion to Li2S/Li2Se efficiently. The [email protected]2 exhibits stronger affinity to polysulfides/polyselenides than the contrast sample [email protected] in the soaking experiment. In addition, the chemical absorption to the polysulfides/polyselenides generated by CoSe2 was further proved via the XPS analysis. Furthermore, the [email protected]2-SeS2 cathode presents 3 times higher exchange current density than the [email protected]2 cathode, suggesting the previous one holds much faster charge-transfer kinetics. Therefore, when tested at 1.0 A g−1, the free-standing [email protected]2-SeS2 cathode presents high initial capacity up to 943.4 mAh g−1 with an outstanding coulombic efficiency. In addition, this cathode exhibits excellent rate performance, delivering 735.9, 677.8, 640.3 and 610.5 mAh g−1 when cycled at 1.0, 2.0, 3.0 and 4.0 A g−1, respectively. This easy fabrication method to obtain a composite with rational design may provide a novel approach for the development of next generation rechargeable batteries." @default.
- W3136754060 created "2021-03-29" @default.
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- W3136754060 date "2021-08-01" @default.
- W3136754060 modified "2023-10-13" @default.
- W3136754060 title "The free-standing cathode fabricated with nano-CoSe2 embedded in mesoporous carbon nanosheets towards high performance Li/SeS2 batteries" @default.
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- W3136754060 doi "https://doi.org/10.1016/j.cej.2021.129475" @default.
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