Realizing an Applicable Solid → Solid Cathode Process via a Transplantable Solid Electrolyte Interface for Lithium-Sulfur Batteries

doi:10.1021/acsami.9b07787

Realizing an Applicable Solid → Solid Cathode Process via a Transplantable Solid Electrolyte Interface for Lithium-Sulfur Batteries

2019-07-30

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DOI：10.1021/acsami.9b07787

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The conventional lithium-sulfur battery (LSB) undergoes a solid-liquid-solid cathode process during which the intermediate polysulfides dissolve into the electrolyte, leading to a serious shuttle reaction and significantly shortened lifespan. Here, we realize a novel solid -> solid cathode mode for LSBs via a transplantable solid electrolyte interface (SEI). The SEI is in situ formed in a carbonate-based electrolyte with high-concentration dualsalt during the initial discharge process. The solid -> solid cathode process does not involve any dissolution of the intermediates; hence, the shuttle effect can be totally eliminated. Furthermore, the SEI shows a high electrolyte compatibility and can be transplanted to the conventional carbonate-based/ether-based electrolytes. The sulfur/carbon composite with 65% sulfur a reversible specific capacity of 1009 mA h g(-1) and negligible self-discharge. The SEI strategy can successfully break the limitation from the traditional catholyte electrode mechanism. Meanwhile, it provides large flexibility for designing high-loading carbon hosts and selecting an electrolyte for high-performance LSBs.

Keywords:

lithium-sulfur batteries

high-concentration electrolyte

transplantable SEI

solid -> solid conversion

negligible self-discharge

Realizing an Applicable Solid → Solid Cathode Process via a Transplantable Solid Electrolyte Interface for Lithium-Sulfur Batteries

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