Jang, Yong-Jin Seo, Hyungeun Lee, Young-Su Kang, Sora Cho, Woosuk Cho, Young Whan Kim, Jae-Hun 2024-01-19T10:04:50Z 2024-01-19T10:04:50Z 2023-01-03 2023-02 2198-3844 https://pubs.kist.re.kr/handle/201004/114064 Compared with conventional liquid electrolytes, solid electrolytes can better improve the safety properties and achieve high-energy-density Li-ion batteries. Sulfide-based solid electrolytes have attracted significant attention owing to their high ionic conductivities, which are comparable to those of their liquid counterparts. Among them, Li thiophosphates, including Li-argyrodites, are widely studied. In this study, Li thiophosphate solid electrolytes containing BH4- anions are prepared via a simple and fast milling method even without heat treatment. The synthesized materials exhibit a high ionic conductivity of up to 11 mS cm(-1) at 25 degrees C, which is much higher than reported values. To elucidate the mechanism behind, the thiophosphate local structure, whose effect on the ionic conductivity remains unclear to date, is investigated. Raman and solid-state NMR spectroscopies are performed to identify the thiophosphate local structure in the sulfide samples. Based on the analysis results, the ratios of the different thiophosphate units in the prepared electrolyte samples are determined. It is found that the thiophosphate local structure can be varied by changing the amount of LiBH4 and the milling conditions, which significantly impact the ionic conductivity. The all-solid-state cell with the prepared solid electrolyte exhibits superior cycle and rate performances. English Wiley-VCH Verlag Lithium Superionic Conduction in BH4-Substituted Thiophosphate Solid Electrolytes Article 10.1002/advs.202204942 1 Advanced Science, v.10, no.5 Advanced Science 10 5 Y scie scopus 000895999800001 2-s2.0-85144054911 Chemistry, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article; Early Access ION CONDUCTIVITY LI6PS5X X BATTERIES CRYSTALLIZATION STABILITY HALIDES LIBH4 RADII BR CL all-solid-state batteries argyrodite lithium borohydride solid electrolyte thiophosphate