Sr2+-doped rhombohedral LiHf2(PO4)3 solid electrolyte for allsolid-state Li-metal battery  被引量:5

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

机构地区:[1]College of Electrical and Information Engineering,Hunan University,Changsha 410082,China [2]State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [3]School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China

出  处:《Rare Metals》2020年第9期1092-1098,共7页稀有金属(英文版)

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

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 resistance.Here,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 pressing.Li1.4Sr0.2Hf1.8(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.

关 键 词:Solid-state electrolyte NASICON Rhombohedral phase Interfacial resistance All-solid-state battery 

分 类 号:TM912[电气工程—电力电子与电力传动]

 

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