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A Metal–Organic‐Framework‐Based Electrolyte with Nanowetted Interfaces for High‐Energy‐Density Solid‐State Lithium Battery
Author(s) -
Wang Ziqi,
Tan Rui,
Wang Hongbin,
Yang Luyi,
Hu Jiangtao,
Chen Haibiao,
Pan Feng
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201704436
Subject(s) - materials science , electrolyte , battery (electricity) , lithium (medication) , electrochemistry , ionic conductivity , chemical engineering , electrode , conductivity , ionic bonding , ionic liquid , energy storage , fast ion conductor , nanotechnology , ion , organic chemistry , chemistry , catalysis , medicine , power (physics) , physics , quantum mechanics , engineering , endocrinology
Solid‐state batteries (SSBs) are promising for safer energy storage, but their active loading and energy density have been limited by large interfacial impedance caused by the poor Li + transport kinetics between the solid‐state electrolyte and the electrode materials. To address the interfacial issue and achieve higher energy density, herein, a novel solid‐like electrolyte (SLE) based on ionic‐liquid‐impregnated metal–organic framework nanocrystals (Li‐IL@MOF) is reported, which demonstrates excellent electrochemical properties, including a high room‐temperature ionic conductivity of 3.0 × 10 ‐4 S cm ‐1 , an improved Li + transference number of 0.36, and good compatibilities against both Li metal and active electrodes with low interfacial resistances. The Li‐IL@MOF SLE is further integrated into a rechargeable Li|LiFePO 4 SSB with an unprecedented active loading of 25 mg cm ‐2 , and the battery exhibits remarkable performance over a wide temperature range from −20 up to 150 °C. Besides the intrinsically high ionic conductivity of Li‐IL@MOF, the unique interfacial contact between the SLE and the active electrodes owing to an interfacial wettability effect of the nanoconfined Li‐IL guests, which creates an effective 3D Li + conductive network throughout the whole battery, is considered to be the key factor for the excellent performance of the SSB.