Environmentally stable interface of layered oxide cathodes for sodium-ion batteries.

ABSTRACT: Sodium-ion batteries are strategically pivotal to achieving large-scale energy storage. Layered oxides, especially manganese-based oxides, are the most popular cathodes due to their high reversible capacity and use of earth-abundant elements. However, less noticed is the fact that the interface of layered cathodes always suffers from atmospheric and electrochemical corrosion, leading to severely diminished electrochemical properties. Herein, we demonstrate an environmentally stable interface via the superficial concentration of titanium, which not only overcomes the above limitations, but also presents unique surface chemical/electrochemical properties. The results show that the atomic-scale interface is composed of spinel-like titanium (III) oxides, enhancing the structural/electrochemica

SUBMITTER: Guo S 

PROVIDER: S-EPMC5526914 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature