New Class of Titanium Niobium Oxide for a Li-Ion Host: TiNbO4 with Purely Single-Phase Lithium Intercalation
- Title
- New Class of Titanium Niobium Oxide for a Li-Ion Host: TiNbO4 with Purely Single-Phase Lithium Intercalation
- Author
- 방진호
- Issue Date
- 2022-01
- Publisher
- AMER CHEMICAL SOC
- Citation
- Chemistry of Materials; 1/25/2022, Vol. 34 Issue 2, p854-863, 10p
- 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.
- URI
- https://pubs.acs.org/doi/10.1021/acs.chemmater.1c03960https://repository.hanyang.ac.kr/handle/20.500.11754/171079
- ISSN
- 08974756
- DOI
- 10.1021/acs.chemmater.1c03960
- Appears in Collections:
- COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > CHEMICAL AND MOLECULAR ENGINEERING(화학분자공학과) > Articles
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