Sr2+-doped rhombohedral LiHf2(PO4)3 solid electrolyte for allsolid-state Li-metal battery

作     者：Qing-Hui Li Chang Xu Bing Huang Xin Yin Qing-Hui Li;Chang Xu;Bing Huang;Xin Yin

作者机构：College of Electrical and Information EngineeringHunan UniversityChangsha 410082China State Key Laboratory of New Ceramics and Fine ProcessingSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and EngineeringTianjin UniversityTianjin 300072China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2020年第39卷第9期

页      面：1092-1098页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：financially supported by the National Natural Science Foundation of China(No.51504127) 

主　　题：Solid-state electrolyte NASICON Rhombohedral phase Interfacial resistance All-solid-state battery 

摘      要：Solid-state electrolytes in rechargeable all-solidstate Li-metal batteries,which have better safety and higher specific capacity than conventional rechargeable Liion batteries with liquid electrolytes,are limited by the low Li-ion conductivity of the solid electrolyte and the large electrolyte/electrode interfacial ***,we report a new rhombohedral NAS ICON structure Li1.4Sr0.2Hf1.8(PO4)3 with a high Li-ion conductivity of 1.62×10-5 S·cm-1 at 25℃,and its conductivity can be improved to 3.4×10-5 S·cm-1 after the densification of the pellet by hot ***1.4Sr0.2Hf1.8(PO4)3 coated by a thin layer of polymer electrolyte showed a stable lowimpedance dendrite-free plating/stripping process in a symmetric Li/Li cell for 100 h;moreover,the Li1.4Sr0.2Hf1.8(PO4)3 electrolyte had a small interfacial resistance in all-solid-state Li/LiFePO4 cell,which allows a high Coulombic efficiency and good cycling of the cell.