In Situ Directional Polymerization of Poly(1,3-dioxolane)Solid Electrolyte Induced by Cellulose Paper-Based Composite Separator for Lithium Metal Batteries  

作　　者：Jian Ma Yueyue Wu Hao Jiang Xin Yao Fan Zhang Xianglong Hou Xuyong Feng Hongfa Xiang 

机构地区：[1]School of Materials Science and Engineering,Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices,Hefei University of Technology,Hefei 230009,China

出　　处：《Energy & Environmental Materials》2023年第3期134-143,共10页能源与环境材料（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52072105,21676067);the Key R&D Program of Anhui Province(202104a05020044);the Anhui Provincial Natural Science Foundation(2108085J23);Science and Technology Major Project of Anhui Province(202003a05020014);the Fundamental Research Funds for the Central Universities(PA2021KCPY0028,JZ2020YYPY0109).

摘　　要：In traditional in situ polymerization preparation for solid-state electrolytes,initiators are directly added to the liquid precursor.In this article,a novel cellulose paper-based composite separator is fabricated,which employs alumina as the inorganic reinforcing material and is loaded with polymerization initiator aluminum trifluoromethanesulfonate.Based upon this,a separator-induced in situ directional polymerization technique is demonstrated,and the extra addition of initiators into liquid precursors is no longer required.The polymerization starts from the surface and interior of the separator and extends outward with the gradually dissolving of initiators into the precursor.Compared with its traditional counterpart,the separator-induced poly(1,3-dioxolane)electrolyte shows improved interfacial contact as well as appropriately mitigated polymerization rate,which are conducive to practical applications.Electrochemical measurement results show that the prepared poly(1,3-dioxolane)solid electrolyte possesses an oxidation potential up to 4.4 V and a high Li+transference number of 0.72.After 1000 cycles at 2 C rate(340 mA g^(−1)),the assembled Li||LiFePO_(4)solid battery possesses a 106.8 mAh g^(−1)discharge capacity retention and 83.5%capacity retention ratio,with high average Coulombic efficiency of 99.5%achieved.Our work may provide new ideas for the design and application of in situ polymerization technique for solid electrolytes and solid batteries.

关 键 词：cellulose paper-based composite separator in situ directional polymerization lithium metal battery poly-DOL electrolyte solid-state electrolyte 

分 类 号：TM912[电气工程—电力电子与电力传动] O631[理学—高分子化学]