Oxygen vacancies-rich TiO_(2-x) enhanced composite polyurethane electrolytes for high-voltage solid-state lithium metal batteries  

作　　者：Xiaoning Xu Fei Pei Wenjie Lin Jia Lei Yuhan Yang Henghui Xu Zhen Li Yunhui Huang 

机构地区：[1]State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [2]Dongfeng Motor Corporation Research&Development Institute,Wuhan 430058,China

出　　处：《Nano Research》2025年第4期228-237,共10页纳米研究(英文版)

基　　金：supported by the National Key R&D Program of China(No.2023YFB2503804);the National Natural Science Foundation of China(No.52202236);China Postdoctoral Science Foundation(Nos.2024T170300 and 2022M711232).

摘　　要：Due to the favorable interfacial stability with electrodes,excellent processability,and reasonable material cost,organic-inorganic composite solid-state electrolytes have attracted broad interests in the field of solid-state batteries.In this study,we have developed a solid-state composite electrolyte with polyurethane(PU)as polymer matrix and TiO_(2-x) as nanofiller(denoted as PUL-TiO_(2-x)).The block copolymer PU features alternating soft and hard segments,which offers distinct advantages due to its unique structural arrangement.The soft segment of the block copolymer facilitates the dissociation of lithium salt,enabling the conduction of Li^(+),while the rich hydrogen bond network formed by the hard segment ensures the mechanical strength of the electrolyte.The profusion of Lewis acid sites on the TiO_(2-x) surface facilitates interactions with ether oxygen groups and bistrifluoromethanesulfonimide(TFSI-)anions,thereby enhancing ionic conductivity(σ)and expanding the electrochemical stability window of the electrolyte.Notably,the PUL-TiO_(2-x) electrolyte exhibits an impressiveσof 2.19×10^(-4) S·cm^(-1) at 40℃,a Li^(+)transference number of 0.47,and an electrochemical stability window of 4.98 V.The resulting LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)||Li battery demonstrates a specific capacity of 171 mAh·g^(-1) and exhibits excellent cycling stability,maintaining its performance over 270 cycles at 40℃.These findings underscore the immense potential of the PUL-TiO_(2-x) in advancing the development of high-performance all-solid-state lithium batteries.

关 键 词：polyurethane electrolyte composite polymer electrolytes high-voltage cathodes solid-state lithium metal batteries 

分 类 号：TM911.1[电气工程—电力电子与电力传动] TM912