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Functional Covalent Triazine Frameworks‐Based Quasi‐Solid‐State Electrolyte Used to Enhance Lithium Metal Battery Safety
Author(s) -
Shi Qing Xuan,
Guan Xin,
Pei Hui Jie,
Chang Chen,
Qu Hao,
Xie Xiao Lin,
Ye Yun Sheng
Publication year - 2020
Publication title -
batteries and supercaps
Language(s) - English
Resource type - Journals
ISSN - 2566-6223
DOI - 10.1002/batt.202000069
Subject(s) - electrolyte , materials science , ionic conductivity , battery (electricity) , chemical engineering , electrochemistry , dendrite (mathematics) , lithium (medication) , lithium metal , salt (chemistry) , ionic liquid , ionic bonding , covalent bond , nanotechnology , ion , chemistry , electrode , organic chemistry , medicine , power (physics) , physics , geometry , mathematics , quantum mechanics , engineering , endocrinology , catalysis
The development and use of lithium metal batteries (LMBs) has been hampered by uneven Li deposition and dendrite formation during repeated cycling. Here, a new class of quasi‐solid‐state electrolytes (QSSE) consisting of ionic liquid functional covalent triazine‐based frameworks (IL‐fCTF) and a Li salt‐ionic liquid (LIL), formed by simple mechanical mixing, is shown to overcome these problems. The IL‐fCTF based QSSE exhibits high strength stability, due to its robust CTF skeleton that suppresses unwanted Li dendrite formation. Moreover, LIL absorbed in the ordered porous structures of the CTF skeleton forms three‐dimensional (3D) continues ion transport channels, beneficial for Li‐ion conduction and ensuring even Li deposition. The QSSE used in LMBs shows a high room‐temperature ionic conductivity (1.33 mS cm −1 at 30 °C), due to its excellent electrolyte uptake, ultra‐high Li‐ion transfer number (0.648), improved electrochemical/cycling stability and good rate capacity. The easily fabricated QSSE‐based battery's excellent performance makes it a promising candidate for practical application in LMBs.