A layered multifunctional framework based on polyacrylonitrile and MOF derivatives for stable lithium metal anode  

作　　者：Fanfan Liu Peng Zuo Jing Li Pengcheng Shi Yu Shao Linwei Chen Yihong Tan Tao Ma 

机构地区：[1]Engineering Research Center of High-frequency Soft Magnetic Materials and Ceramic Powder Materials of Anhui Province,School of Chemistry and Material Engineering,Chaohu University,Hefei 238024,Anhui,China [2]Frontiers Science Center for Transformative Molecules,School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [3]School of Pharmacy,Anhui University of Chinese Medicine,Hefei 230012,Anhui,China [4]School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,Guangdong,China [5]Jiujiang DeFu Technology Co.,Ltd.,Jiujiang 332000,Jiangxi,China

出　　处：《Journal of Energy Chemistry》2024年第6期282-288,I0007,共8页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China (52302292, 52302058, 52302085);the China Postdoctoral Science Foundation (2021M702225);the Anhui Province University Natural Science Research Project (2023AH030093, 2023AH040301);the Startup Research Fund of Chaohu University (KYQD-2023005, KYQD-2023051)。

摘　　要：Composite Li metal anodes based on three-dimensional(3D) porous frameworks have been considered as an effective material for achieving stable Li metal batteries with high energy density.However,uneven Li deposition behavior still occurs at the top of 3D frameworks owing to the local accumulation of Li ions.To promote uniform Li deposition without top dendrite growth,herein,a layered multifunctional framework based on oxidation-treated polyacrylonitrile(OPAN) and metal-organic framework(MOF) derivatives was proposed for rationally regulating the distribution of Li ions flux,nucleation sites,and electrical conductivity.Profiting from these merits,the OPAN/carbon nano fiber-MOF(CMOF) composite framework demonstrated a reversible Li plating/stripping behavior for 500 cycles with a stable Coulombic efficiency of around 99.0% at the current density of 2 mA/cm~2.Besides,such a Li composite anode exhibited a superior cycle lifespan of over 1300 h under a low polarized voltage of 18 mV in symmetrical cells.When the Li composite anode was paired with LiFePO_(4)(LFP) cathode,the obtained full cell exhibited a stable cycling over 500 cycles.Moreover,the COMSOL Multiphysics simulation was conducted to reveal the effects on homogeneous Li ions distribution derived from the above-mentioned OPAN/CMOF framework and electrical insulation/conduction design.These electrochemical and simulated results shed light on the difficulties of designing stable and safe Li metal anode via optimizing the 3D frameworks.

关 键 词：Lithium metal anode Layered multifunctional framework Ions flux redistribution Electrical insulation/conduction structure Uniform Li deposition 

分 类 号：O646[理学—物理化学] TM912[理学—化学]