Flame-retardant oligomeric electrolyte additive for self-extinguishing and highly-stable lithium-ion batteries:Beyond small molecules  

作　　者：Yi-Zhou Quan Qing-Song Liu Mei-Chen 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》2023年第9期374-384,共11页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China (51773134, U19A2095);the Sichuan Science and Technology Program (2019YFH0112);the Fundamental Research Funds for the Central Universities;Institutional Research Fund from Sichuan University (2021SCUNL201);the 111 Project (B20001)。

摘　　要：Preparing both safe and high-performance lithium-ion batteries(LIBs) based on commonly used commercial electrolytes is highly desirable,yet challenging.To overcome the poor compatibility of conventional small-molecular flame-retardants as electrolyte additives for safe LIBs with graphite anodes,in this study,we propose and design a novel low-cost flame-retardant oligomer that achieves an accurate and complete reconciliation of fire safety and electrochemical performance in LIBs.Owing to the integration of phosphonate units and polyethylene glycol(PEG) chains,this oligomer,which is a phosphonatecontaining PEG-based oligomer(PPO),not only endows commercial electrolytes with excellent flame retardancy but also helps stabilize the electrodes and Li-ion migration.Specifically,adding 15 wt% of PPO can reduce 70% of the self-extinguishing time and 54% of total heat release for commercial electrolytes.Moreover,LiFePO_(4)/lithium and graphite/lithium cells as well as LiFePO_(4)/graphite pouch full cells exhibit good long-term cycling stability.

关 键 词：Flame-retardant oligomer Safety Compatibility Graphite anodes Lithium-ion batteries 

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]