Hybrid conductive-lithophilic-fluoride triple protection interface engineering:Dendrite-free reverse lithium deposition for high-performance lithium metal batteries  

作　　者：Huiying Li Chang Hong Runming Tao Xiaolang Liu Jianxing Wang Jianyu Chen Shuhao Yao Jiazhi Geng Guang Zheng Jiyuan Liang 

机构地区：[1]Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education,School of Optoelectronic Materials&Technology,Jianghan University,Wuhan 430056,Hubei,China [2]Applied Materials Division,Argonne National Laboratory,Lemont,IL 60439,USA [3]State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM),Nanjing University of Posts&Telecommunications,Nanjing 210023,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2025年第2期416-428,I0009,共14页能源化学(英文版)

基　　金：financially supported by the Natural Science Foundation of China(52277218);the Hubei Provincial Natural Science Foundation of China(2024AFA094);the Excellent Discipline Cultivation Project by JHUN(2023XKZ009);the Graduate Student Innovation Fund of JHUN(KYCXJJ202422).

摘　　要：Lithium metal batteries(LMBs)with high energy density are impeded by the instability of solid electrolyte interface(SEI)and the uncontrolled growth of lithium(Li)dendrite.To mitigate these challenges,optimizing the SEI structure and Li deposition behavior is the key to stable LMBs.This study novelty proposes a facile synthesis of MgF_(2)/carbon(C)nanocomposite through the mechanochemical reaction between metallic Mg and polytetrafluoroethylene(PTFE)powders,and its modified polypropylene(PP)separator enhances LMB performance.The in-situ formed highly conductive fluorine-doped C species play a crucial role in facilitating ion/electron transport,thereby accelerating electrochemical kinetics and altering Li deposition direction.During cycling,the in-situ reaction between MgF_(2)and Li leads to the formation of LiMg alloy,along with a LiF-rich SEI layer,which reduces the nucleation overpotential and reinforces the interphase strength,leading to homogeneous Li deposition with dendrite-free feature.Benefiting from these merits,the Li metal is densely and uniformly deposited on the MgF_(2)/C@PP separator side rather than on the current collector side.Furthermore,the symmetric cell with MgF_(2)/C@PP exhibits superb Li plating/stripping performance over 2800 h at 1 mA cm^(-2)and 2 mA h cm^(-2).More importantly,the assembled Li@MgF_(2)/C@PPILiFePO4full cell with a low negative/positive ratio of 3.6delivers an impressive cyclability with 82.7%capacity retention over 1400 cycles at 1 C.

关 键 词：Lithium metal batteries Separator modification MgF_(2) Reverse deposition Mechanochemical reaction 

分 类 号：TM912[电气工程—电力电子与电力传动]