Solvent-Engineered Design of Argyrodite Li6PS5X (X = Cl, Br, I) Solid Electrolytes with High Ionic Conductivity

By Laidong Zhou, Kyu‐Young Park, Xiaoqi Sun, F. Laler̀e, Torben Adermann, P. Hartmann, L. Nazar. ACS Energy Letters, 2018

271 citations recorded by the source corpus.

Argyrodites, Li6PS5X (X = Cl, Br), are considered to be one of the most promising solid-state electrolytes for solid-state batteries. However, while traditional ball-mill approaches to prepare these materials do not promote scale-up, solution-based preparative methods have resulted in poor ionic conductivity. Herein, we report a solution-engineered, scalable approach to these materials, including the new argyrodite solid solution phase Li6–yPS5–yCl1+y (y = 0–0.5), that shows very high ionic conductivities (up to 3.9 mS·cm–1) and negligible electronic conductivities. These properties are almost the same as their analogues prepared by solid-state methods, owing to a lack of amorphous contributions and low impurity contents ranging from 3 to 10%. Electrochemical performance is demonstrated for Li6PS5Cl in a prototype solid-state battery and compared to that of the same solid electrolyte derived from classic ball-milling processing.

Subfields: Electrical and Electronic Engineering, Inorganic Chemistry

View Paper: https://www.semanticscholar.org/paper/bb84faad0cd4be3afb2a08a2a077e43e20051396