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Article Abstract
The commercial application of lithium-sulfur batteries (LSBs) has been seriously hindered by the shuttle effect of lithium polysulfides (LiPSs) and their slow redox kinetics. In this work, g-CN/MoO composed of graphite carbon nitride (g-CN) nanoflake and MoO nanosheet is designed and applied to modify the separator. The polar MoO can form chemical bond with LiPSs, effectively slowing down the dissolution of LiPSs. And based on the principle of "Goldilocks", LiPSs will be oxidized by MoO to thiosulfate, which will promote the rapid conversion from long-chain LiPSs to LiS. Moreover, g-CN can promote the electron transportation, and its high specific surface area can facilitate the deposition and decomposition of LiS. What's more, the g-CN promotes the preferential orientation on the MoO(021) and MoO(040) crystal planes, which optimizes the adsorption capacity of g-CN/MoO for LiPSs. As a result, the LSBs with g-CN/MoO modified separator with a synergistic adsorption-catalysis, can achieve an initial capacity of 542 mAh g at 4C with capacity decay rate of 0.0053% per cycle for 700 cycles. This work achieves the synergy of adsorption and catalysis of LiPSs through the combination of two materials, providing a material design strategy for advanced LSBs.
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| http://dx.doi.org/10.1016/j.jcis.2023.06.103 | DOI Listing |
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