Compositional Study of Ti-Nb Oxide (TiNb2O7, Ti2Nb10O29, Ti2Nb14O39, and TiNb24O62) Anode for High Power Li Ion Batteries

Abstract

Titanium niobium oxides (TNOs) are attractive anode materials for high power density Li-ion batteries. However, the details of capacity storage in TNOs is not fully understood today as it depends on the Ti and Nb composition and their changes in oxidation state. This is further complicated by a wide variation in gravimetric capacities reported in literature for TNO anodes. Therefore, in this work, we systematically synthesise TiNb2O7, Ti2Nb10O29, Ti2Nb14O39, and TiNb24O62 particles using the same solid state reaction approach, and report their electrochemical properties via galvanostatic cycling, cyclic voltammetry, galvanostatic intermittent titration technique (GITT). Further we use operando X-ray absorption spectroscopy (XAS) to investigate the redox reactions taking place in each of these compositions, which provides new insights in their charge storage mechanisms. We found that of the materials tested, TiNb2O7 anodes have the best cycling and rate performance, which could be related to the higher utilization of Nb redox revealed via operando XAS analysis.

Supplementary files

Article information

Article type
Paper
Submitted
15 Nov 2024
Accepted
06 Feb 2025
First published
19 Feb 2025
This article is Open Access
Creative Commons BY license

J. Mater. Chem. A, 2025, Accepted Manuscript

Compositional Study of Ti-Nb Oxide (TiNb2O7, Ti2Nb10O29, Ti2Nb14O39, and TiNb24O62) Anode for High Power Li Ion Batteries

Y. Son, H. Jang, B. Wen, C. Jo, A. Groombridge, A. Boies, M. G. Kim and M. De Volder, J. Mater. Chem. A, 2025, Accepted Manuscript , DOI: 10.1039/D4TA08141B

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