A layered nonstoichiometric lepidocrocite-type sodium titanate anode material for sodium-ion batteries

Date Published
09/2021
Publication Type
Journal Article
Authors
DOI
10.1557/s43581-021-00008-6
Abstract

A lepidocrocite-structured sodium titanate prepared by ion-exchange of a Cs-containing precursor shows promise as an anode material for sodium ion batteries, with a discharge capacity of up to 229 mAh g−1 at an average potential of about 0.6 V vs. Na+/Na. Titanium vacancies in the metal oxide layers provide additional sites for sodium intercalation in addition to interlayer sites, which accounts for the higher capacity compared to other previously reported lepidocrocite-structured titanates. By screening a series of electrolyte formulations and binders, we were able to improve the first-cycle coulombic efficiency to 81.8% and 94.7% respectively using CMC/SBR-based and binder-free electrodes in ether electrolytes. The electrochemical consequences of short-term air-exposure on the electrodes are also discussed.

Journal
MRS Energy & Sustainability
Volume
8
Year of Publication
2021
Issue
2
Pagination
88 - 97
ISSN Number
2329-2229
URL
Short Title
MRS Energy & Sustainability
Refereed Designation
Refereed
Organizations
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