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Building Lithiophilic Ion‐Conduction Highways on Garnet‐Type Solid‐State Li + Conductors
Author(s) -
Cheng Zhangyuan,
Xie Maoling,
Mao Yayun,
Ou Jianxin,
Zhang Sijing,
Zhao Zheng,
Li Jinlin,
Fu Fang,
Wu Jihuai,
Shen Yanbin,
Lu Derong,
Chen Hongwei
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201904230
Subject(s) - materials science , anode , electrolyte , cathode , electrical conductor , fast ion conductor , electrode , quasi solid , layer (electronics) , ion , metal , solid state , chemical engineering , electrical impedance , optoelectronics , nanotechnology , composite material , engineering physics , electrical engineering , metallurgy , physics , quantum mechanics , chemistry , dye sensitized solar cell , engineering
The integration of highly conductive solid‐state electrolytes (SSEs) into solid‐state cells is still a challenge mainly due to the high impedance existing at the electrolyte/electrode interface. Although solid‐state garnet‐based batteries have been successfully assembled with the assistance of an intermediate layer between the garnet and the Li metal anode, the slow discharging/charging rates of the batteries inhibits practical applications, which require much higher power densities. Here, a crystalline sulfonated‐covalent organic framework (COF) thin layer is grown on the garnet surface via a simple solution process. It not only significantly improves the lithiophilicity of garnet electrolytes via the lithiation of the COF layer with molten Li, but also creates effective Li + diffusion “highways” between the garnet and the Li metal anode. As a result, the interfacial impedance of symmetric solid‐state Li cells is significantly decreased and the cells can be operated at high current densities up to 3 mA cm −2 , which is difficult to achieve with current interfacial modification technologies for SSEs. The solid‐state Li‐ion batteries using LiFePO 4 cathodes, Li anodes, and COF‐modified garnet electrolytes thus exhibit a significantly improved rate capability.