Thiol-ene crosslinked cellulose-based gel polymer electrolyte with good structural integrity for high cycling performance lithium-metal battery  

作　　者：Hongbing Zhang Sijie Wang Yujie Wang Shuhan Dong Wen Chen De Li Feng Yu Yong Chen 

机构地区：[1]State Key Laboratory of Marine Resource Utilization in South China Sea,Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Resources,Hainan University,Haikou 570228,China [2]Guangdong Key Laboratory for Hydrogen Energy Technologies,School of Materials Science and Hydrogen Energy,Foshan University,Foshan 528000,China

出　　处：《Chinese Chemical Letters》2023年第4期283-289,共7页中国化学快报（英文版）

基　　金：financially supported by National Natural Science Foundation of China (Nos. 21965012, 52003068, 52062012);Research Project of Hainan Province (Nos. ZDYF2021SHFZ263,2019RC038 and ZDYF2020028);Guangdong Province Key Discipline Construction Project (No. 2021ZDJS102);the Innovation Team of Universities of Guangdong Province (No. 2022KCXTD030)。

摘　　要：Gel polymer electrolytes(GPEs) are considered to be one most promising alternative to liquid electrolytes due to their suitability for creating safe and durable solid-state lithium-metal batteries. However, the mechanical properties of GPEs usually deteriorate dramatically when polymer matrices are plasticized by a liquid electrolyte, which leads to significant loss of battery performance. Therefore, the long-term structural integrity and good mechanical strength are critical characteristics of GPEs designed for highperformance batteries. Here, an ecologically compatible cellulose-based GPE with a crosslinked structure is synthesized via a facile and effective thiol-ene click chemistry method. The prepared thiol-ene crosslinked GPE possesses enhanced mechanical strength(10.95 MPa) and rigid structure, which enabled us to fabricate Li Fe PO_(4)|Li batteries with ultra-long cycling performance. The capacity retention of the crosslinked cellulose-based GPE can be up to 84% at 0.5 C, even after 350 cycles, which is considerably higher than that of non-crosslinked GPE for which rapid decline in capacity occurs after 200 cycles. In addition, a GPE preparation method described in this work compares favorably well with existing commercial electrolytes for lithium metal batteries.

关 键 词：Gel polymer electrolytes CELLULOSE Crosslinked network Thiol-ene click chemistry Lithium-metal battery 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ317[化学工程—高聚物工业]