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Excellent Stability of a Lithium‐Ion‐Conducting Solid Electrolyte upon Reversible Li + /H + Exchange in Aqueous Solutions
Author(s) -
Ma Cheng,
Rangasamy Ezhiylmurugan,
Liang Chengdu,
Sakamoto Jeffrey,
More Karren L.,
Chi Miaofang
Publication year - 2015
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.201408124
Subject(s) - lithium (medication) , electrolyte , aqueous solution , ion , chemistry , ion exchange , inorganic chemistry , electrode , organic chemistry , medicine , endocrinology
Batteries with an aqueous catholyte and a Li metal anode have attracted interest owing to their exceptional energy density and high charge/discharge rate. The long‐term operation of such batteries requires that the solid electrolyte separator between the anode and aqueous solutions must be compatible with Li and stable over a wide pH range. Unfortunately, no such compound has yet been reported. In this study, an excellent stability in neutral and strongly basic solutions was observed when using the cubic Li 7 La 3 Zr 2 O 12 garnet as a Li‐stable solid electrolyte. The material underwent a Li + /H + exchange in aqueous solutions. Nevertheless, its structure remained unchanged even under a high exchange rate of 63.6 %. When treated with a 2 M LiOH solution, the Li + /H + exchange was reversed without any structural change. These observations suggest that cubic Li 7 La 3 Zr 2 O 12 is a promising candidate for the separator in aqueous lithium batteries.