Composite electrolyte with self-inserted structure and all-trans F conformation provides fast Li^(+) transport for solid-state Li metal batteries  

作　　者：Ziyang Liang Chang Liu Xiang Bai Jiahui Zhang Xinyue Chang Lixiang Guan Tiantian Lu Huayun Du Yinghui Wei Qian Wang Tao Wei Wen Liu Henghui Zhou 

机构地区：[1]College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan,Shanxi,the People's Republic of China [2]Shanxi Energy Internet Research Institute,Taiyuan,Shanxi,the People's Republic of China [3]College of Chemistry and Molecular Engineering,Peking University,Beijing,the People's Republic of China [4]School of Energy and Power,Jiangsu University of Science and Technology,Zhenjiang,the People's Republic of China [5]State Key Lab of Chemical Resource Engineering College of Science and College of Energy,Beijing University of Chemical Technology,Beijing,the People's Republic of China

出　　处：《InfoMat》2024年第11期81-93,共13页信息材料（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Number:52071227;Beijing Natural Science Foundation-Xiaomi Innovation Joint Foundation,Grant/Award Number:L223011;Key Scientific Research Project in Shanxi Province,Grant/Award Number:201805D121003;Special Found Projects for Central Government Guidance to Local Science and Technology Development,Science and Technology Major Projects of Shanxi Province,Grant/Award Number:20191102004;Young Elite Scientists Sponsorship Program,Grant/Award Number:CAST(2022QNRC001);Fundamental Research Program of Shanxi Province,Grant/Award Number:202103021222006;Shanxi Energy Internet Research Institute,Grant/Award Number:SXEI2023A004;Shanxi Scholarship Council of China,Grant/Award Number:HGKY2019085;Open Research Fund of Guangdong Advanced Carbon Materials Co.,Ltd,Grant/Award Number:Kargen-2024B0905。

摘　　要：Solid-state Li metal battery has attracted increasing interests for its potentiallyhigh energy density and excellent safety assurance, which is a promising candidatefor next generation battery system. However, the low ionic conductivityand Li^(+) transport number of solid-state polymer electrolytes limit their practicalapplication. Herein, a composite polymer electrolyte with self-insertedstructure is proposed using the layered double hydroxides (LDHs) as dopant toachieve a fast Li^(+) transport channel in poly(vinylidene-co-trifluoroethylene) [P(VDF-TrFE)] based polymer electrolyte. In such a composite electrolyte, P(VDF-TrFE) polymer has an all-trans conformation, in which all fluorineatoms locate on one side of the polymer chain, providing fast Li^(+) transporthighways. Meanwhile, the LDH can immobilize the anions of Li salts based onthe electrostatic interactions, promoting the dissociation of Li salts, therebyenhancing the ionic conductivity (6.4 × 10^(-4) S cm^(-1)) and Li^(+) transferencenumber (0.76). The anion immobilization effect can realize uniform electricfield distribution at the anode surface and suppress the dendritic Li growth.Moreover, the hydrogen bonding interaction between LDH and polymerchains also endows the composite electrolyte with strong mechanical properties.Thus, at room temperature, the Li jj Li symmetric cells can be stablycycled over 1000 h at a current density of 0.2 mA cm^(-2), and the full cells withLiFePO_(4) cathode deliver a high capacity retention (>95%) after 200 cycles. This work offers a promising route to construct solid-state polymer electrolytes withfast Li^(+) transport.

关 键 词：LDH Li metal batteries Li^(+) transport channel P(VDF-TrFE) solid-state polymer electrolytes 

分 类 号：TM912[电气工程—电力电子与电力传动]