Sulfolane‑Based Flame‑Retardant Electrolyte for High‑Voltage Sodium‑Ion Batteries  

作　　者：Xuanlong He Jie Peng Qingyun Lin Meng Li Weibin Chen Pei Liu Tao Huang Zhencheng Huang Yuying Liu Jiaojiao Deng Shenghua Ye Xuming Yang Xiangzhong Ren Xiaoping Ouyang Jianhong Liu Biwei Xiao Jiangtao Hu Qianling Zhang 

机构地区：[1]Graphene Composite Research Center,College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen 518060,People’s Republic of China [2]Center of Electron Microscopy,State Key Laboratory of Silicon and Advanced Semiconductor Materials,School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,People’s Republic of China [3]GRINM(Guangdong)Research Institute for Advanced Materials and Technology,Foshan,Guangdong 528051,People’s Republic of China [4]College of Energy Engineering,Zhejiang University,Hangzhou,Zhejiang 310027,People’s Republic of China [5]School of Materials Science and Engineering,Xiangtan University,Xiangtan 411105,People’s Republic of China [6]Shenzhen Eigen-Equation Graphene Technology Co.Ltd,Shenzhen 518000,People’s Republic of China

出　　处：《Nano-Micro Letters》2025年第2期498-516,共19页纳微快报（英文版）

基　　金：financial support by National Natural Science Foundation(NNSF)of China(Nos.52202269,52002248,U23B2069,22309162);Shenzhen Science and Technology program(No.20220810155330003);Shenzhen Basic Research Project(No.JCYJ20190808163005631);Xiangjiang Lab(22XJ01007).

摘　　要：Sodium-ion batteries hold great promise as next-generation energy storage systems.However,the high instability of the electrode/electrolyte interphase during cycling has seriously hindered the development of SIBs.In particular,an unstable cathode–electrolyte interphase(CEI)leads to successive electrolyte side reactions,transition metal leaching and rapid capacity decay,which tends to be exacerbated under high-voltage conditions.Therefore,constructing dense and stable CEIs are crucial for high-performance SIBs.This work reports localized high-concentration electrolyte by incorporating a highly oxidation-resistant sulfolane solvent with non-solvent diluent 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether,which exhibited excellent oxidative stability and was able to form thin,dense and homogeneous CEI.The excellent CEI enabled the O3-type layered oxide cathode NaNi_(1/3)Mn_(1/3)Fe_(1/3)O_(2)(NaNMF)to achieve stable cycling,with a capacity retention of 79.48%after 300 cycles at 1 C and 81.15%after 400 cycles at 2 C with a high charging voltage of 4.2 V.In addition,its nonflammable nature enhances the safety of SIBs.This work provides a viable pathway for the application of sulfolane-based electrolytes on SIBs and the design of next-generation high-voltage electrolytes.

关 键 词：Sodium-ion batteries Sulfolane-based electrolyte High voltage Layered oxide cathode Flame retardant 

分 类 号：O646[理学—物理化学] TM912[理学—化学]