Enhancing interfacial stability in solid-state lithium batteries with polymer/garnet solid electrolyte and composite cathode framework  

作　　者：Long Chen Xiaoming Qiu Zhiming Bai Li-Zhen Fan 

机构地区：[1]Beijing Advanced Innovation Center for Materials Genome Engineering,Beijing Key Laboratory for Advanced Energy Materials and Technologies,University of Science and Technology Beijing,Beijing 100083,China [2]Beijing Key Laboratory of Advanced Chemical Energy Storage Technologies and Materials,Research Institute of Chemical Defense,Beijing 100191,China [3]Shanxi Key Laboratory of New Energy Materials and Devices,Taiyuan University of Technology,030024,China [4]School of Materials Science and Engineering,Beihang University,Beijing 100191,China

出　　处：《Journal of Energy Chemistry》2021年第1期210-217,I0007,共9页能源化学（英文版）

基　　金：Financial supports from the National Natural Science Foundation of China (51575030, 51532002 and 51872027);Beijing Natural Science Foundation (L172023);National Basic Research Program of China (2017YFE0113500)。

摘　　要：The solid-state lithium battery is considered as an ideal next-generation energy storage device owing to its high safety,high energy density and low cost.However,the poor ionic conductivity of solid electrolyte and low interfacial stability has hindered the application of solid-state lithium battery.Here,a flexible polymer/garnet solid electrolyte is prepared with poly(ethylene oxide),poly(vinylidene fluoride),Li6.75La3 Zr1.75Ta0.25O12,lithium bis(trifluoromethanesulfonyl)imide and oxalate,which exhibits an ionic conductivity of 2.0 ×10^(-4) S cm^(-1) at 55℃,improved mechanical property,wide electrochemical window(4.8 V vs.Li/Li+),enhanced thermal stabilities.Tiny acidic OX was introduced to inhibit the alkalinity reactions between Li6.75La3 Zr1.75Ta0.25O12 and poly(vinylidene fluoride).In order to improve the interfacial stability between cathode and electrolyte,an Al2 O3@LiNi0.5Co0.2Mn0.3O2 based composite cathode framework is also fabricated with poly(ethylene oxide) polymer and lithium salt as additives.The solid-state lithium battery assembled with polymer/garnet solid electrolyte and composite cathode framework demonstrates a high initial discharge capacity of 150.6 mAh g^(-1) and good capacity retention of 86.7% after 80 cycles at 0.2 C and 55℃,which provides a promising choice for achieving the stable electrode/electrolyte interfacial contact in solid-state lithium batteries.

关 键 词：Li6.75La3Zr1.75Ta0.25O12 Polymer/garnet solid electrolyte Interfacial stability Composite cathode framework Lithium metal batteries 

分 类 号：TB332[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]