Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 16, Issue 28, Pages 14669-14674Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp02046d
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Funding
- Max Planck Society
- University of Munich (LMU)
- Center for NanoScience (CeNS)
- Deutsche Forschungsgemeinschaft (DFG) through the Cluster of Excellence Nanosystems Initiative Munich'' (NIM)
- Fonds der Chemischen Industrie
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We report on a new ultrafast solid electrolyte of the composition Li11Si2PS12, which exhibits a higher room-temperature Li ion diffusivity than the present record holder Li10GeP2S12. We discuss the high-pressure synthesis and ion dynamics of tetragonal Li11Si2PS12, and comparison is made with our investigations of related members of the LMePS family, i.e. electrolytes of the general formula Li11-xMe2-xP1+xS12 with Me = Ge, Sn : Li10GeP2S12, Li7GePS8, Li10SnP2S12. The structure and dynamics were studied with multiple complementary techniques and the macroscopic diffusion could be traced back to fast Li ion hopping in the crystalline lattice. A clear correlation between the diffusivity and the unit cell volume of the LGPS-type electrolytes was observed.
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