Seo, Hyungeun Jang, Yong-Jin Yoo, Jaeseong Han, Ji-Hoon Lee, Young-Su Jung, Jae Yup Lee, Soeun Yi, Kyung-Woo Cho, Young Whan Cho, Woosuk Kim, Jae-Hun 2024-10-04T01:30:38Z 2024-10-04T01:30:38Z 2024-10-02 2024-10 2050-7488 https://pubs.kist.re.kr/handle/201004/150714 All-solid-state batteries (ASSBs) containing solid electrolytes can offer high energy density and enhanced safety compared to conventional Li-ion batteries. Among solid electrolytes, sulfide-based materials have garnered significant attention owing to their high ionic conductivity and facile processability. In this study, Li argyrodite solid electrolytes containing both BH4- and Br- anions were prepared using a straightforward two-step milling method without heat treatment. The synthesized materials exhibited an impressive ionic conductivity of up to 14.4 mS cm-1 at room temperature, which surpassed previously reported values of borohydride-substituted argyrodite electrolytes. To elucidate the effect of Br- anion replacement in the thiophosphate local structure, Raman and 31P solid-state nuclear magnetic resonance spectroscopic analyses were performed. The results showed that the total proportion of the PS43- units in the argyrodite phase, including both BH4- and Br- anions, determined the Li ionic conductivity of the solid electrolytes. The prepared solid electrolyte samples were stable up to 5 V vs. Li+/Li without any notable side reactions. The rate performance of the ASSBs, including both the Br- and BH4--substituted solid electrolytes, was superior to that of the cell with the BH4--substituted solid electrolyte. A borohydride-halide substituted argyrodite solid electrolyte exhibits a high ionic conductivity of 14.4 mS cm-1 at room temperature. English Royal Society of Chemistry Enhancement of ionic conductivity in Li argyrodite solid electrolytes with bromide and borohydride anions for all-solid-state batteries Article 10.1039/d4ta04426f 1 Journal of Materials Chemistry A, v.12, no.39, pp.27022 - 27030 Journal of Materials Chemistry A 12 39 27022 27030 N scie scopus 001313044500001 2-s2.0-85204186769 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article METAL LI6PS5X LITHIUM BATTERIES STABILITY