New Class of Titanium Niobium Oxide for a Li-Ion Host: TiNbO4 with Purely Single-Phase Lithium Intercalation
- Authors
- Lee, Jeongmin; Kwak, Hunho H.; Bak, Sang-eun; Lee, Geun Jun; Hong, Seung-Tae; Abbas, Muhammad A.; Bang, Jin Ho
- Issue Date
- Jan-2022
- Publisher
- American Chemical Society
- Citation
- Chemistry of Materials, v.34, no.2, pp 854 - 863
- Pages
- 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- Chemistry of Materials
- Volume
- 34
- Number
- 2
- Start Page
- 854
- End Page
- 863
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/111507
- DOI
- 10.1021/acs.chemmater.1c03960
- ISSN
- 0897-4756
1520-5002
- Abstract
- Entropy-stabilized titanium niobium oxides (TNOs) with crystallographic shear structures (e.g., TiNb2O7 and Ti2Nb10O29) are generally synthesized by high-temperature calcination in an air or an oxygen atmosphere to compensate for their positive enthalpies of formation. In this work, we demonstrate that changing the reaction atmosphere into a slightly reductive environment using in situ carbonization leads to the creation of a new class of TNO with a formula of TiNbO4. Unlike its predecessors, this new lithium reservoir is a rutile phase, and most strikingly, in situ X-ray diffraction analysis revealed that its lithium intercalation occurs via a purely solid-solution process. Since solid-electrolyte-interface-free, high capacity anode materials with long cyclic life are required to meet the stringent requirements of widespread lithium-ion battery utilization, this finding of a new electrode material with purely single-phase lithium intercalation is of great interest for the development of high-performance anode materials. Distinctive electrochemical behavior that is different from that of crystallographic shear structured TNO is revealed by in-depth electrochemical analyses, which is ascribed to the unique structural and electronic properties of TiNbO4. We believe this work opens a new avenue for the development of feasible oxide-based alternatives to graphite, which can be safer and suitable for high-power performance.
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