首页|All-fluorinated electrolyte for non-flammable batteries with ultra-high specific capacity at 4.7 V

All-fluorinated electrolyte for non-flammable batteries with ultra-high specific capacity at 4.7 V

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
Li metal batteries(LMBs)with LiNi0.8Mn0.1Co0.1O2(NMC811)cathodes could release a specific energy of>500 Wh kg-1 by increasing the charge voltage.However,high-nickel cathodes working at high voltages accelerate degradations in bulk and at interfaces,thus significantly degrading the cycling lifespan and decreasing the specific capacity.Here,we rationally design an all-fluorinated electrolyte with addictive tri(2,2,2-trifluoroethyl)borate(TFEB),based on 3,3,3-fluoroethylmethylcarbonate(FEMC)and fluoroethylene carbonate(FEC),which enables stable cycling of high nickel cathode(LiNi0.8Co0.1Mn0.1O2,NMC811)under a cut-off voltage of 4.7 V in Li metal batteries.The electrolyte not only shows the fire-extinguishing properties,but also inhibits the transition metal dissolution,the gas production,side reactions on the cathode side.Therefore,the NMC811jjLi cell demonstrates excellent performance by using limited Li and high-loading cathode,delivering a specific capacity>220 mA h g-1,an average Coulombic efficiency>99.6%and capacity retention>99.7%over 100 cycles.

Fluorinated electrolyteLi metal batteriesSolid electrolyte interphaseCathode electrolyte interphaseCoulombic efficiency

Zhe Wang、Zhuo Li、Jialong Fu、Sheng Zheng、Rui Yu、Xiaoyan Zhou、Guanjie He、Xin Guo

展开 >

State Key Laboratory of Material Processing and Die&Mould Technology,Laboratory of Solid State Ionics,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan,430074,China

Electrochemical Innovation Lab,Department of Chemical Engineering,University College London,20 Gordon Street,London WC1E 7JE,UK

National Natural Science Foundation of ChinaIsraeli Science Foundation within the framework of the joint NSFC-ISFChina Postdoctoral Science Foundation funded project

519611453022020M682403

2024

10.1016/j.gee.2023.06.002

绿色能源与环境(英文)

绿色能源与环境(英文)

CSTPCD
ISSN：
年,卷(期)：2024.9(10)