Li4SiO4 Doped-Li7P2S8I solid electrolytes with high lithium stability synthesised using liquid-phase shaking. Issue 12 (7th March 2022)

• Record Type: Journal Article
• Authors: Hikima, Kazuhiro; Ler, Ho Jia; Indrawan, Radian Febi; Muto, Hiroyuki; Matsuda, Atsunori
• Is Part Of: RSC advances. Volume 12:Issue 12(2022)
• Page Start: 7469
• Page End: 7474
• Publication Date: 2022-03-07
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1ra09348g
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The galvanostatic cycling test results demonstrate that the Li7 P2 S8 I·10Li4 SiO4 has excellent long-term cycling stability in excess of 680 cycles (1370 h), indicating that it is highly compatible with Li anode. Abstract : In this study, mechanical milling and liquid-phase shaking are used to synthesise 3Li2 S·P2 S5 LiI· x Li4 SiO4 (Li7 P2 S8 I· x Li4 SiO4 ) solid electrolytes. When mechanical milling is used, the electrolyte samples doped with 10 mol% of Li4 SiO4 (Li7 P2 S8 I·10Li4 SiO4 ) have the highest ionic conductivity at ∼25–130 °C. When liquid-phase shaking is used, they exhibit a relatively high conductivity of 0.85 mS cm −1 at ∼20 °C, and low activation energy for conduction of 17 kJ mol −1 . A cyclic voltammogram shows that there are no redox peaks between −0.3 and +10 V, other than the main peaks near 0 V ( v.s. Li/Li + ), indicating a wide electrochemical window. The galvanostatic cycling test results demonstrate that the Li7 P2 S8 I·10Li4 SiO4 has excellent long-term cycling stability in excess of 680 cycles (1370 h), indicating that it is highly compatible with Li. Thus, Li7 P2 S8 I solid electrolytes doped with Li4 SiO4 are synthesised using the liquid-phase shaking method for the first time and achieve a high ionic conductivity of 0.85 mS cm −1 at 25 °C. This work demonstrates the effects of Li4 SiO4 doping, which can be used to improve the ionic conductivity and stability against Li anodes with Li7 P2 S8 I solid electrolytes.