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

Publication Type

Journal Article

Date Published

09/2021

Authors

DOI

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

URL

Issue

2

ISSN

2329-2229

Organization