电解质
电化学
阳极
离子电导率
电导率
锂(药物)
材料科学
无机化学
兴奋剂
快离子导体
化学工程
化学
电极
物理化学
内分泌学
工程类
医学
光电子学
作者
Ming Wu,Gaozhan Liu,Xiayin Yao
摘要
Highly conductive argyrodite electrolytes are considered to be one of the most prospective solid electrolytes for all-solid-state batteries. However, poor electrochemical compatibility with a Li anode restrains their application. Herein, oxygen doping is adopted to improve the chemical and electrochemical performance of the argyrodite electrolyte. Meanwhile, the Cl−/S2− ratio is increased to enhance the lithium ionic conductivity. The resultant Li6.05PS4.9O0.1Cl1.05 electrolyte exhibits a high conductivity of 7.49 mS cm−1. Benefitting from the stable Li3OCl formed at the electrolyte/Li interface and the low electronic conductivity arising from the oxygen doping, a Li6.05PS4.9O0.1Cl1.05 electrolyte shows excellent interfacial stability and lithium dendrites suppression capability. A Li/Li6.05PS4.9O0.1Cl1.05/Li cell can maintain stable Li plating/stripping for 13 000 h at 0.1 mA cm−2. Moreover, a high critical current density up to 1.3 mA cm−2 of Li6.05PS4.9O0.1Cl1.05 is realized. Consequently, the LiCoO2/Li6.05PS4.9O0.1Cl1.05/Li batteries achieve remarkable better cycling stability than that using pristine Li6PS5Cl, possessing a reversible capacity of 104.6 mAh g−1 at 1C with a capacity retention of 86.7% after 300 cycles.
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