Electron Acceptor‑Driven Solid Electrolyte Interphases with Elevated LiF Content for 4.7 V Lithium Metal Batteries  

作　　者：Yongbiao Mu Zifan Liao Youqi Chu Qing Zhang Lingfeng Zou Lin Yang Yitian Feng Haixiang Ren Meisheng Han Lin Zeng 

机构地区：[1]Shenzhen Key Laboratory of Advanced Energy Storage,Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen 518055,People’s Republic of China [2]SUSTech Energy Institute for Carbon Neutrality,Southern University of Science and Technology,Shenzhen 518055,People’s Republic of China

出　　处：《Nano-Micro Letters》2025年第7期234-253,共20页纳微快报(英文版)

基　　金：financially supported by the Guangdong Major Project of Basic and Applied Basic Research(No.2023B0303000002);the Shenzhen Key Laboratory of Advanced Energy Storage(ZDSYS20220401141000001);the High level of special funds(G03034K001)。

摘　　要：High-voltage lithium(Li)metal batteries(LMBs)face substantial challenges,including Li dendrite growth and instability in high-voltage cathodes such as LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)(NCM811),which impede their practical applications and long-term stability.To address these challenges,tris(pentafluorophenyl)borane additive as an electron acceptor is introduced into an ethyl methyl carbonate/fluoroethylene carbonate-based electrolyte.This approach effectively engineers robust dual interfaces on the Li metal anode and the NCM811 cathode,thereby mitigating dendritic growth of Li and enhancing the stability of the cathode.This additive-driven strategy enables LMBs to operate at ultra-high voltages up to 4.7 V.Consequently,Li||Cu cells achieve a coulombic efficiency of 98.96%,and Li||Li symmetric cells extend their cycle life to an impressive 4000 h.Li||NCM811 full cells maintain a high capacity retention of 87.8%after 100 cycles at 4.7 V.Additionally,Li||LNMO full cells exhibit exceptional rate capability,delivering 132.2 mAh g^(-1)at 10 C and retaining 95.0%capacity after 250 cycles at 1 C and 5 V.As a result,NCM811||graphite pouch cells maintain a 93.4%capacity retention after 1100 cycles at 1 C.These findings underscore the efficacy of additive engineering in addressing Li dendrite formation and instability of cathode under high voltage,thereby paving the road for durable,high-performance LMBs.

关 键 词：Lithium metal batteries High-voltage cathodes Electron acceptor Dendrite formation Dual interfaces 

分 类 号：TM912[电气工程—电力电子与电力传动]