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Sustainable Gel Electrolyte Containing Pyrazole as Corrosion Inhibitor and Dendrite Suppressor for Aqueous Zn/LiMn 2 O 4 Battery
Author(s) -
Hoang Tuan K. A.,
Doan The Nam Long,
Cho Julie Hyeonjoo,
Su Jane Ying Jun,
Lee Christine,
Lu Changyu,
Chen P.
Publication year - 2017
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201700441
Subject(s) - electrolyte , anode , inorganic chemistry , chronoamperometry , aqueous solution , dendrite (mathematics) , electrochemistry , chemistry , materials science , battery (electricity) , fumed silica , chemical engineering , cyclic voltammetry , electrode , organic chemistry , quantum mechanics , engineering , power (physics) , physics , geometry , mathematics
The Zn anode in secondary aqueous batteries suffers from dendrite formation and corrosion. In this work, dendrite formation was suppressed by using a simple but new gel electrolyte containing fumed silica and an additive. The dendrite suppression was evidenced by chronoamperometry and ex situ scanning electron microscopy examinations. Pyrazole was implemented as the additive in the electrolyte. It was found that the presence of 0.2 wt % pyrazole in the electrolyte helped minimize both corrosion and dendrite formation. The Zn/LiMn 2 O 4 battery using pyrazole‐containing gel electrolytes exhibited high cyclability up to 85 % capacity retention after 500 charge–discharge cycles at 4C. This was 8 % higher than the performance of the reference battery (using aqueous electrolyte containing 2 m Li 2 SO 4 and 1 m ZnSO 4 ). Furthermore, self‐discharge of the battery with the pyrazole‐containing gel electrolyte was suppressed, as evidenced by an open‐circuit voltage loss that was 20 % lower than for the reference battery after 24 h monitoring. Float‐charge current density under constant voltage (2.1 V) also significantly decreased from approximately 8.0 to 3–6 μA.