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Rocking‐Chair Ammonium‐Ion Battery: A Highly Reversible Aqueous Energy Storage System
Author(s) -
Wu Xianyong,
Qi Yitong,
Hong Jessica J.,
Li Zhifei,
Hernandez Alexandre S.,
Ji Xiulei
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201707473
Subject(s) - aqueous solution , battery (electricity) , anode , electrochemistry , cathode , energy storage , electrolyte , prussian blue , organic radical battery , inorganic chemistry , chemistry , potassium ion battery , ion , materials science , electrode , chemical engineering , organic chemistry , lithium vanadium phosphate battery , power (physics) , physics , quantum mechanics , engineering
Abstract Aqueous rechargeable batteries are promising solutions for large‐scale energy storage. Such batteries have the merit of low cost, innate safety, and environmental friendliness. To date, most known aqueous ion batteries employ metal cation charge carriers. Here, we report the first “rocking‐chair” NH 4 ‐ion battery of the full‐cell configuration by employing an ammonium Prussian white analogue, (NH 4 ) 1.47 Ni[Fe(CN) 6 ] 0.88 , as the cathode, an organic solid, 3,4,9,10‐perylenetetracarboxylic diimide (PTCDI), as the anode, and 1.0 m aqueous (NH 4 ) 2 SO 4 as the electrolyte. This novel aqueous ammonium‐ion battery demonstrates encouraging electrochemical performance: an average operation voltage of ca. 1.0 V, an attractive energy density of ca. 43 Wh kg −1 based on both electrodes’ active mass, and excellent cycle life over 1000 cycles with 67 % capacity retention. Importantly, the topochemistry results of NH 4 + in these electrodes point to a new paradigm of NH 4 + ‐based energy storage.