材料科学
电导率
离子电导率
电解质
水溶液
快离子导体
分析化学(期刊)
差示扫描量热法
退火(玻璃)
离子
阴极
物理化学
热力学
复合材料
化学
电极
色谱法
物理
有机化学
作者
Reiko Matsuda,Hiroyuki Muto,Atsunori Matsuda
标识
DOI:10.1021/acsami.2c08723
摘要
The stability of sulfide-based solid electrolytes (SEs) in ambient air is a critical criterion for the application of all-solid-state lithium-ion batteries. Air-stable Li3SbS4–LiI SEs were synthesized using a unique process in an aqueous solution under ambient air, i.e., an ion-exchange (IE) process. The crystalline structure of Li3SbS4 obtained by this process was confirmed by X-ray diffraction (XRD) patterns. The ionic conductivity of the obtained SE was 8.5 × 10–8 S cm–1 at 50 °C. The SEs of Li3SbS4–LiI were also synthesized via the IE process. The temperature dependence of the Li3SbS4–LiI SEs’ ionic conductivities showed a unique behavior; for example, the conductivities of 60Li3SbS4·40LiI (LSbSI) rapidly increased upon heating from 1.8 × 10–7 S cm–1 at 26.5 °C to 8.4 × 10–3 S cm–1 at 65 °C. The LiI layers on LSbSI are responsible for the unique temperature dependence of conductivity determined by differential scanning calorimetry–XRD measurement. Further, the dehydrated LSbSI obtained by milling and annealing showed a high conductivity of 1.3 × 10–4 S cm–1 at a low temperature of 25 °C. A cathode composite containing the active material of Ti2S and the LSbSI SE obtained via the IE process was prepared by freeze-drying. The all-solid-state cell using the cathode composite, which consists of Li–In/SE/TiS2–LSbSI, showed good performance at 60 °C as a lithium-ion secondary battery.
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