材料科学
电解质
离子电导率
电化学
快离子导体
离子
陶瓷
离子键合
电导率
兴奋剂
硫化物
化学工程
无机化学
复合材料
冶金
电极
物理化学
化学
光电子学
有机化学
工程类
作者
Zuojiong Gong,Lingjun Shu,Jing Yin,Chengwei Gao,Yongxing Liu,Xiaolong Zhou,Xiang Shen,Shixun Dai,Changgui Lin,Qing Jiao
标识
DOI:10.1016/j.ceramint.2023.09.070
摘要
Here, we report the SiS2–NaBr double-doped sulfide superionic conductor Na3.02Si0.1Sb0.9S3.92Br0.08. The dual-doping effect of SiS2 and NaBr in the Na3SbS4 electrolyte was investigated by mechanical ball milling and high-temperature heat treatment. The improved glass–ceramic Na3.02Si0.1Sb0.9S3.92Br0.08 solid electrolyte obtained a high ionic conductivity of 2.26 × 10−3 S/cm and a low activation energy of 0.077 eV (0.25 eV for Na3SbS4) at room temperature. Moreover, the electrochemical property test was characterized by a higher critical current density of 1.228 mA/cm2 (0.585 mA/cm2 for Na3SbS4) and stable cycling at 0.1 mA cm−2 current densities exceeding 120 h (50.33 h for Na3SbS4). Some Si atoms occupying the Sb position greatly contributed to the formation of the Na3SbS4 high-ionic conductive phase. The introduction of an appropriate amount of halogen improved the compactness of the sample and nearly suppressed the majority of H2S release from the original electrolyte. The substitution effect and the ion conduction structure were analyzed in detail.
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