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Corrosion Prevention Mechanism of Aluminum Metal in Superconcentrated Electrolytes
Author(s) -
Yamada Yuki,
Chiang Ching Hua,
Sodeyama Keitaro,
Wang Jianhui,
Tateyama Yoshitaka,
Yamada Atsuo
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500235
Subject(s) - electrolyte , corrosion , lithium (medication) , electrochemistry , inorganic chemistry , materials science , metal , lithium metal , aluminium , chemistry , chemical engineering , metallurgy , electrode , endocrinology , medicine , engineering
Metal corrosion is a serious problem that has beset various electrochemical systems. For lithium‐ion batteries, oxidative corrosion of an Al current collector has been a great challenge in designing new electrolyte materials, and only a few lithium salts (e.g. LiPF 6 ) are in practical use. The present work shows effective suppression of Al corrosion up to 4.5 V versus Li + /Li by using a highly concentrated electrolyte of lithium bis(fluorosulfonyl)amide (LiFSA). The corrosion prevention mechanism can be interpreted in relation to a remarkable change in solution structures at a certain threshold concentration. It is demonstrated that highly concentrated LiFSA/acetonitrile electrolyte enables highly reversible charge–discharge cycling of a 4 V‐class LiMn 2 O 4 /Li cell at a higher rate (ca. 50 % capacity retention at 20 C compared to C/2) than a state‐of‐the‐art commercial electrolyte (<20 %), thus providing a new design strategy for electrolyte materials in high‐rate lithium‐ion batteries.