Overcoming the Na-ion conductivity bottleneck for the cost-competitive chloride solid electrolytes  

作　　者：Lv Hu Hui Li Fang Chen Yating Liu Jinzhu Wang Cheng Ma 

机构地区：[1]Hefei National Research Center for Physical Sciences at the Microscale,CAS Key Laboratory of Materials for Energy Conversion,Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,Anhui,China [2]National Synchrotron Radiation Laboratory,Hefei 230026,Anhui,China

出　　处：《Journal of Energy Chemistry》2024年第8期1-8,I0001,共9页能源化学（英文版）

基　　金：the financial support from the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB0450201);the National Key R&D Program of China(2018YFA0209600);USTC Research Funds of the Double FirstClass Initiative(YD2060002033);the Fundamental Research Funds for the Central Universities(WK2060000060);the National Synchrotron Radiation Laboratory(KY2060000199)。

摘　　要：Chloride solid electrolytes possess multiple advantages for the construction of safe,energy-dense allsolid-state sodium batteries,but presently the chlorides with sufficiently high cost-competitiveness for commercialization almost all exhibit low Na-ion conductivities of around 10^(-5)S cm^(-1)or lower.Here,we report a chloride solid electrolyte,Na_(2.7)ZFCl_(5.3)O_(0.7),which reaches a Na-ion conductivity of 2.29×10^(-4)S cm^(-1)at 25℃without involving overly expensive raw materials such as rare-earth chlorides or Na_(2)S.In addition to the efficient ion transport,Na_(2.7)ZrCl_(5.3)O_(0.7)also shows an excellent deformability surpassing that of the widely studied Na_(3)PS_(4),Na_(3)SbS_(4),and Na_(2)ZrCl_(6)solid electrolytes.The combination of these advantages allows the all-solid-state cell based on Na_(2.7)ZrCl_(5.3)O_(0.7)and NaCrO_(2)to realize stable room-temperature cycling at a much higher specific current than those based on other non-viscoelastic chloride solid electrolytes in literature(120 mA g^(-1)vs.12-55 mA g^(-1));after 100 cycles at such a high rate,the Na_(2.7)ZFCl_(5.3)O_(0.7)-based cell can still deliver a discharge capacity of 80 mAh g^(-1)at25℃.

关 键 词：All-solid-state sodium batteries Ionic conductivities Solid electrolytes Chlorides High voltage stability 

分 类 号：O646[理学—物理化学] TM912[理学—化学]