电解质
材料科学
结晶度
电化学
快离子导体
兴奋剂
电导率
硫化物
矿物学
离子
化学工程
分析化学(期刊)
电极
复合材料
冶金
化学
物理化学
光电子学
工程类
有机化学
色谱法
作者
Bo Liang,Guoda Wang,Haiyang Shan,Ping Dong,Liangliang Yu,Changgui Lin,Chengwei Gao,Yongxing Liu,Xiang Shen,Qing Jiao
摘要
Abstract Solid Na‐ion‐conducting sulfides exhibited potential applications for commercial solid‐state rechargeable batteries because of their low cost and good contact with the electrode. In the present work, a sulfide sodium‐ion conductor 2Na 3 SbS 4 ·Na 2 WS 4 with a conductivity of 1.55 mS cm −1 was obtained, which was identified as superior to the 2Na 3 SbS 4 ·Na 4 XS 4 (X = Si, Ge, Sn) systems. Further exploration of the heat treatment to improve the crystallinity of the glass resulted in a high conductivity of 1.9 mS cm −1 and low activation energy of 0.24 eV for the 2Na 3 SbS 4 ·Na 2 WS 4 glass–ceramic electrolyte. The high crystallinity after heat treatment at 380°C facilitated the migration of Na + together with large sodium vacancies formed by doping with W 6+ in 2Na 3 SbS 4 ·Na 2 WS 4 glass–ceramic electrolyte, resulting in the improved electrochemical performance. In addition, the air stability of the 2Na 3 SbS 4 ·Na 2 WS 4 glass–ceramic electrolyte decreased monotonically with increase of the annealing temperature, and heat application at 380°C effectively improved the electrolyte tolerance to the air compared with pure Na 3 PS 4 electrolyte. The origins of aliovalent ion doping and thermal effect on the electrochemical performance were discussed in detail.
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