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Title: Excellent stability of a lithium-ion-conducting solid electrolyte upon reversible Li +/H + exchange in aqueous solutions

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 7La 3Zr 2O 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. Furthermore, these observations suggest that cubic Li 7La 3Zr 2O 12 is a promising candidate for the separator in aqueous lithium batteries.
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  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Michigan State Univ., East Lansing, MI (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Angewandte Chemie (International Edition)
Additional Journal Information:
Journal Name: Angewandte Chemie (International Edition); Journal Volume: 54; Journal Issue: 1; Journal ID: ISSN 1433-7851
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
25 ENERGY STORAGE; lithium batteries; solid electrolytes; garnet; proton exchange; electron microscopy
OSTI Identifier: