Cooperation of metal-organic coordination complex separator and wide-temperature-range electrolyte enables safe and high-performance lithium batteries  

作　　者：You Gao Qing-Song Liu Guo-Rui Zhu Gang Wu Xiu-Li Wang Yu-Zhong Wang 

机构地区：[1]The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE),National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan),State Key Laboratory of Polymer Materials Engineering,College of Chemistry,Sichuan University,Chengdu 610064,Sichuan,China

出　　处：《Journal of Energy Chemistry》2024年第12期692-702,共11页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China (22275131);the Institutional Research Fund from Sichuan University (2021SCUNL201);the 111 Project (B20001);the Fundamental Research Funds for the Central Universities。

摘　　要：With the increase of people’s demand,it is extremely desired for developing high-safety,widetemperature-range and high-energy-density lithium batteries,but huge challenges are remained due to shrinkage and combustion of commonly used polyolefin separators at high temperatures,as well as narrow usable temperature range and high flammability of conventionally commercialized liquid electrolytes.In this work,we report a multifunctional separator mainly consisting of Zn^(2+)-phytate coordination complex nanoparticles and bacterial cellulose nanofibers,named the BZP separator,which possesses high porosity,excellent thermotolerance,good flame retardancy,abilities of anion binding and Ni^(2+)capturing.Through cooperating with the fluoride-free wide-temperature-range electrolyte,Li//LiFePO_(4) cells not only deliver discharge capacities of 110.39 mA h g^(-1)and 113.25 mA h g^(-1)after 2200 cycles (2 C) and1600 cycles (5 C) at 25℃,with capacity retentions of 76.59%and 86.09%,respectively,but also exhibit excellent cycling performance at 80℃ and-40℃.Significantly,the Li//NCM811 cell with a loading of7.8 mg cm^(-2)delivers a discharge capacity of 146.64 mA h g^(-1)after 200 cycles at 0.5 C,with a capacity retention of 89.03%.In addition,pouch cells can work at 120℃ and have low flammability.

关 键 词：Metal-organic coordination complex SEPARATOR ELECTROLYTE Thermal and fire safety Lithium batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] O646[理学—物理化学] TB383.2[理学—化学]