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Reversible Insertion of Mg‐Cl Superhalides in Graphite as a Cathode for Aqueous Dual‐Ion Batteries
Author(s) -
Kim Keunil,
Guo Qiubo,
Tang Longteng,
Zhu Liangdong,
Pan Changqing,
Chang Chihhung,
Razink Joshua,
Lerner Michael M.,
Fang Chong,
Ji Xiulei
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202009172
Subject(s) - graphite , aqueous solution , intercalation (chemistry) , choline chloride , chloride , inorganic chemistry , electrolyte , chemistry , eutectic system , deep eutectic solvent , cathode , materials science , organic chemistry , electrode , alloy
Oxidative anion insertion into graphite in an aqueous environment represents a significant challenge in the construction of aqueous dual‐ion batteries. In dilute aqueous electrolytes, the oxygen evolution reaction (OER) dominates the anodic current before anions can be inserted into the graphite gallery. Herein, we report that the reversible insertion of Mg‐Cl superhalides in graphite delivers a record‐high reversible capacity of 150 mAh g −1 from an aqueous deep eutectic solvent comprising magnesium chloride and choline chloride. The insertion of Mg‐Cl superhalides in graphite does not form staged graphite intercalation compounds; instead, the insertion of Mg‐Cl superhalides makes the graphite partially turbostratic.