Superionic halogen-rich Li-argyrodites using in situ nanocrystal nucleation and rapid crystal growth
- Superionic halogen-rich Li-argyrodites using in situ nanocrystal nucleation and rapid crystal growth
- 정경윤; 정훈기; 김병국; 이종호; 김형철; 김지수; 전민재; 최성준; 정으뜸; 김성민; 이종흔
- Li-ion conductors; Li-argyrodites; mechanical alloying; rapid-thermal annealing; all-solid-state batteries
- Issue Date
- Nano letters
- VOL 20, NO 4-2309
- While several crystalline materials have been developed as Li-ion conductors for use as solid electrolytes in all-solid-state batteries (ASSBs), producing materials with high Li-ion conductivities is time-consuming and cost-intensive. Herein, we introduce a superionic halogen-rich Li-argyrodite (HRLA) and demonstrate its innovative synthesis using ultimate-energy mechanical alloying (UMA) and rapid thermal annealing (RTA). UMA with a 49 G-force milling energy provides a one-pot process that includes mixing, glassification, and crystallization, to produce as-milled HRLA powder that is ~70% crystallized; subsequent RTA using an infrared lamp increases this crystallinity to ~82% within 25 min. Surprisingly, this HRLA exhibits the highest Li-ion conductivity among Li-argyrodites (10.2 mS cm− 1 at 25 °C, cold-pressed powder compact) reported so far. Furthermore, we confirm that this superionic HRLA works well as a promising solid electrolyte without a decreased intrinsic electrochemical window in various electrode configurations and delivers impressive cell performance (114.2 mAh g− 1 at 0.5 C).
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