Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 9, Pages 6288-6294Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00861
Keywords
solid electrolyte; double antiperovskite; ionic conductivity; grain boundary; surficial reconstruction
Funding
- 1000 Talents Program of China
- Zhengzhou Materials Genome Institute
- National Natural Science Foundation of China [51001091, 51571182, 111174256, 91233101, 51602094, 11274100]
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Solid electrolytes based on theoretically identified double antiperovskite phases Li6OSI2 were successfully synthesized. Experimental characterization supported the theoretical prediction that S substitution of O leads to stabilization of the double antiperovskite structure and lattice softening to significantly enhance ionic conductivity, so that the total Li+ conductivity in Li6.5OS1.5I1.5 was two to three orders better than that of the best stoichiometric antiperovskite phase Li3OCl. However, both antiperovskite and double antiperovskite materials are fundamentally susceptible to surface reconstruction, which is behind significant boundary resistances typically known for materials based on antiperovskite hali-chalcogenides. Such a surface related problem was then effectively reduced through amorphous phase formation, thus offering a feasible route to exploit the full potential of this class of new materials as competitive candidates for solid Li-ion batteries.
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