Low cost and low density chloride solid electrolyte for all solid state cathode with high active material ratio  

作　　者：Hao-Yuan Tan Mei-Yu Zhou Zhongyuan Huang Jin-Da Luo Jing-Tian Yang Jian-Ping Wang Ye-Chao Wu Xiao-Bin Cheng Zi-Wei Wang Xu-Dong Hao Linjun Wang Ke Gong Yi-Chen Yin Yinguo Xiao Hong-Bin Yao 

机构地区：[1]Hefei National Research Center for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China [2]Department of Applied Chemistry,University of Science and Technology of China,Hefei 230026,China [3]School of Advanced Materials,Peking University Shenzhen Graduate School,Shenzhen 518055,China

出　　处：《Nano Research》2024年第10期8826-8833,共8页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(Nos.22325505,52073271,and 22305236);the USTC Research Funds of the Double First-Class Initiative(No.YD2060002034);the Collaborative Innovation Program of Hefei Science Center,CAS(No.2022HSC-CIP018);the China Postdoctoral Science Foundation(Nos.2023M733375 and 2023T160619).

摘　　要：Chloride solid electrolytes(SEs)have attracted widespread attention due to their high room-temperature ionic conductivity and excellent cathode compatibility.However,the conventionally selected central metal elements(e.g.,In,Y and Ta)are usually rare and heavy,inevitably causing the high cost and high density of the obtained chloride SEs.Here,by choosing abundant and light Mg and Al as central metal elements,we develop a cheap and low density Li_(1.2)Mg_(0.95)Al_(0.3)Cl_(4)SE for high active material ratio in all solid state cathode.Partial replacement of Mg^(2+)by Al^(3+)in the framework yields vacancies and lowers the non-lithium metal ions occupancy at Mg/Li co-occupied 16d site,effectively relieving the blocking effects by Mg^(2+)in the pristine spinel Li_(2-2x)Mg_(1+x)Cl_(4).Thus,a significantly improved room-temperature conductivity of 3.08×10^(-4)S·cm^(-1)is achieved,two orders of magnitude higher than that of Li_(1.2)Mg_(1.4)Cl_(4).More attractively,its low density of only 1.98 g·cm-3 enables low SE mass ratio in cathodes(only 16 wt.%)with still effective electrolyte/cathode contact and lithium-ion conduction inside.When charged to potential of 4.30 V,the asfabricated Li_(1.2)Mg_(0.95)Al_(0.3)Cl_(4)-based solid lithium battery with uncoated NCM523 cathode can be cycled for over 100 cycles with a capacity retention of 86.68%at room temperature.

关 键 词：chloride solid electrolytes low cost low density Li+conductivities 

分 类 号：TM91[电气工程—电力电子与电力传动]