High-safety and high-voltage lithium metal batteries enabled by nonflammable diluted highly concentrated electrolyte  

作　　者：Han Zhang Ziqi Zeng Shuping Wang Yuanke Wu Changhao Li Mengchuang Liu Xinlan Wang Shijie Cheng Jia Xie 

机构地区：[1]State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [2]State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [3]State Grid Anhui Electric Power Research Institute,Anhui Province Key Laboratory of Electric Fire and Safety Protection(State Grid Laboratory of Fire Protection for Transmission and Distribution Facilities),Hefei 230601,China [4]School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Nano Research》2024年第4期2638-2645,共8页纳米研究（英文版）

基　　金：supported by the Science and Technology Project of State Grid Corporation of China(No.4000-202320087A-1-1-ZN).

摘　　要：Lithium metal batteries(LMBs)show great promise for achieving energy densities over 400 Wh·kg^(-1).However,highly flammable organic electrolytes are a long-lasting problem that triggers safety hazards and hinders the commercial application of LMBs.Here,a nonflammable diluted highly concentrated electrolyte(DHCE)with ethoxy(pentafluoro)cyclotriphosphazene(PFPN)as a diluent is developed to simultaneously achieve high safety and cycling stability of high-voltage LMBs.The optimal DHCE not only ensures reversible Li deposition/dissolution behavior with a superior average Coulombic efficiency(CE)over 99.1%on lithium metal anode(LMA),but also suppresses side reactions and stress crack on the LiCoO_(2)(LCO)under high cut-off voltage.The newly developed DHCE exhibits high thermal stability,showing complete nonflammability and reduced heat generation between the electrolyte and delithiated LCO/cycled LMA.This work offers an opportunity for rational designing nonflammable electrolytes toward high-voltage and safe LMBs.

关 键 词：lithium metal batteries thermal stability nonflammable electrolyte HIGH-VOLTAGE PHOSPHAZENE 

分 类 号：TM912[电气工程—电力电子与电力传动]