Solution-Processed Synthesis of Nano-Sized Argyrodite Solid Electrolytes with Cavitation Effect for High Performance All-Solid-State Lithium-Ion Batteries

Y Huh and HG Lee and CM Cho and JW Park and BG Kim and YJ Lee and H Park and YC Ha and JH Choi and JD Yi and SM Lee and JI Lee and JH Park, BATTERIES & SUPERCAPS, 6 (2023).

DOI: 10.1002/batt.202300036

To mitigate poor contact issues between electrolyte/electrode materials interfaces of all-solid-state batteries (ASSB), we newly introduce a novel solution-processed synthesis that exploits the differences in the boiling point and polarity of the two solvents (i. e., methanol, and toluene), with a cavitation effect by bubbling inert gas. Through this process, called solvent exchange with bubbles (SEB), the Li6PS5Cl solid electrolyte is synthesized with a particle size below 800 nm and sufficient ionic conductivity of 1.54 mS/cm at 25 degrees C. In addition, the ASSB cell consisting of the cathode electrode with Li6PS5Cl synthesized by the SEB exhibited a high capacity of 176 mAh/g at 0.1 C (55 degrees C) owing to the improved contact between the electrode and solid electrolyte. In particular, the rate capability of the cell is superior to that of a cell with Li6PS5Cl prepared by ball milling.

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