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8789727 
Journal Article 
Bifunctional Interphase-Enabled Li10GeP2S12 Electrolytes for Lithium-Sulfur Battery 
Wan, H; Liu, S; Deng, Tao; Xu, J; Zhang, J; He, X; Ji, X; Yao, X; Wang, C 
2021 
6 
3 
862-868 
WOS:000629230800004 
Li10GeP2S12 (LGPS) has a high ionic conductivity and compatibility with sulfur cathodes; however, the instability of LGPS against Li and Li dendrite growth still remains unsolved. Here, we solved these two challenges by forming a lithiophilic-lithiophobic gradient interlayer interphase layer between Li and LGPS through the sequential reduction of salts and solvent in Mg(TFSI)(2)-LiTFSI-DME liquid electrolyte at the LGPS/Li interface (TFSI = bis(trifluoromethanesulfonyl)imide; DME = dimethoxyethane). Mg(TFSI)(2)-LiTFSI is first reduced, forming a lithiophilic LixMg alloy-rich layer on the lithium surface and a lithiophobic LiF-rich layer on top of LixMg due to the lithiophobicity difference. The later reduced DME solvent forms a flexible organic polymer between the LiF-rich layer and LGPS. After evaporation of DME solvent, the Li/LGPS/Ni-Li2S-LiTiS2 all-solid-state battery shows a reversible capacity of 699.7 mAh g(-1) (1.07 mAh cm(-2)) based on the mass of Ni-Li2S-LiTiS2 at 100 mA g(-1) (0.26 mA cm(-2)). The rational design of a solid electrolyte interface between a Li anode and LGPS electrolyte opens a new opportunity to develop high-performance all-solid-state lithium batteries.