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Lithiophilic Vertical Cactus‐Like Framework Derived from Cu/Zn‐Based Coordination Polymer through In Situ Chemical Etching for Stable Lithium Metal Batteries
Author(s) -
Liu Tiancun,
Chen Shuangqiang,
Sun Weiwei,
Lv LiPing,
Du FeiHu,
Liu Hao,
Wang Yong
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202008514
Subject(s) - materials science , faraday efficiency , anode , lithium (medication) , electrolyte , electrochemistry , chemical engineering , cathode , etching (microfabrication) , polymer , metal , in situ , metal organic framework , coordination polymer , nanotechnology , electrode , composite material , metallurgy , organic chemistry , chemistry , engineering , layer (electronics) , adsorption , endocrinology , medicine
Detrimental dendritic lithium (Li) growth, infinite volume expansion of Li deposition and inevitable excess electrolyte consumption have always impeded the successful application of Li metal anodes. Herein, a unique lithiophilic vertical cactus‐like framework (LVCF) derived from a Zn/Cu‐based coordination polymer through in situ chemical etching of Cu foam is proposed to enhance the safety and electrochemical performance of Li metal anodes. An ingenious strategy of releasing Cu ions from Cu foam in the presence of organic ligands is implemented successfully to achieve the coordination polymer precursor, resulting in the coexistence of massive lithiophilic nitrogen‐containing functional groups, ZnO quantum dots and in situ grown carbon nanotubes (CNTs) in the LVCF, which is beneficial to avoiding the generation of harmful Li dendrites. Benefiting from the positive effects of the improved lithiophilicity, decreased local current density and relieved volume expansion, LVCF delivers an ultrastable Coulombic efficiency of 98.6% for 600 cycles at 1 mA cm –2 and an improved cycling lifespan of 1800 h for symmetric cells. Full cells comprising LVCF@Li anodes and LiFePO 4 cathodes can deliver an ultrahigh capacity of 101.8 mAh g –1 (capacity retention ratio: 77.9%) after 900 cycles at 1 C and excellent rate performance.