Superionic halogen-rich Li-argyrodites using in situ nanocrystal nucleation and rapid crystal growth

Title
Superionic halogen-rich Li-argyrodites using in situ nanocrystal nucleation and rapid crystal growth
Authors
정경윤정훈기김병국이종호김형철김지수전민재최성준정으뜸김성민이종흔
Keywords
Li-ion conductors; Li-argyrodites; mechanical alloying; rapid-thermal annealing; all-solid-state batteries
Issue Date
2020-04
Publisher
Nano letters
Citation
VOL 20, NO 4-2309
Abstract
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).
URI
http://pubs.kist.re.kr/handle/201004/71217
ISSN
1530-6984
Appears in Collections:
KIST Publication > Article
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