Optimal water concentration for aqueous Li+ intercalation in vanadyl phosphate
Open Access
- 11 February 2021
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Chemical Science
- Vol. 12 (12), 4450-4454
- https://doi.org/10.1039/d0sc04647g
Abstract
Development of high-performance aqueous batteries is an important goal for energy sustainability owing to their environmental benignity and low fabrication costs. Although a layered vanadyl phosphate is one of the most-studied host materials for intercalation electrodes with organic electrolytes, little attention has been paid to its use in aqueous Li+ systems because of its excessive dissolution in water. Herein, by controlling the water concentration, we demonstrate the stable operation of a layered vanadyl phosphate electrode in an aqueous Li+ electrolyte. The combination of experimental analyses and density functional theory calculations reveals that reversible (de)lithiation occurs between dehydrated phases, which can only exist in an optimal water concentration.Funding Information
- Japan Society for the Promotion of Science (18H03924, 18K19124, 19H05816)
- Ministry of Education, Culture, Sports, Science and Technology (15H05701)
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