Stable lithium metal anode enabled by a robust artificial fluorinated hybrid interphase  

作　　者：Qiwen Ran Hongyuan Zhao Jintao Liu Lei Li Qiang Hu Jiangxuan Song Xingquan Liu Sridhar Kormarneni 

机构地区：[1]School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 610054,Sichuan,China [2]Departmentof Ecosystem Science and Management and Materials Research Institute,204 Energy and theEnvironment LaboratoryThePennsylvania State University University Park,PA 16802,USA [3]State Key Laboratory for Mechanical Behavior of Materials,Shaanxi International Research Center for Soft Matter,Xi'an Jiaotong University,Xi'an 710049,Shaanxi,China [4]Research Center for Electrochemistry and Energy Engineering,Henan Institute of Science and Technology,Xinxiang 453003,Henan,China

出　　处：《Journal of Energy Chemistry》2023年第8期612-621,I0014,共11页能源化学（英文版）

基　　金：supported by the Natural Science Foundation of Henan Province (202300410163);the Innovative Research Team(in Science and Technology) in University of Henan Province(20IRTSTHN016);the Outstanding Talent Introduction Project of University of Electronic Science and Technology of China(08JC00303);the Innovative Research Team of Sichuan Fuhua New Energy High-Tech Co.,Ltd (621006)。

摘　　要：One of the key challenges for achieving stable lithium(Li) metal anode is the construction of the rational solid electrolyte interphase(SEI),but its realization still faces enormous challenges.In this work,a robust artificial fluorinated hybrid interphase consisting of lithium-bismuth(Li3Bi) alloy and lithium-fluoride(LiF) was designed to regulate Li deposition without Li dendrite growth.The obtained hybrid interphase showed the high Li+diffusion rate(3.5 × 10^(-4)S cm^(-1)),high electron resistivity(9.04 × 10^(4)Ω cm),and high mechanical strength(1348 MPa),thus enabling the uniform Li deposition at the Li/SEI interface.Specifically,Li3Bi alloy,as a superionic conductor,accelerated the Li+transport and stabilized the hybrid interphase.Meanwhile,LiF was identified as a superior electron-blocker to inhibit the electron tunneling from the Li anode into the SEI.As a result,the modified Li anode showed the stable Li plating/stripping behaviors over 1000 cycles even at 20 mA cm^(-2).Moreover,it also enabled the Li(50 μm)‖LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(4.4 mA h cm^(-2)) full cell to achieve an average Coulombic efficiency(CE) of 99.6%and a high-capacity retention of 79.2% after 100 cycles,whereas the bare Li anode only exhibited a low-capacity retention of 8.0%.This work sheds light on the internal mechanism of Li+transport within the hybrid interface and provides an effective approach to stabilize the interface of Li metal anode.

关 键 词：Li metal anode Artificial interphase Li Bi alloy LIF Uniform Li deposition 

分 类 号：TM912[电气工程—电力电子与电力传动] TG146.26[一般工业技术—材料科学与工程]