Carbon-Doped TiNb2O7 Suppresses Amorphization-Induced Capacity Fading
- Title
- Carbon-Doped TiNb2O7 Suppresses Amorphization-Induced Capacity Fading
- Author
- 방진호
- Keywords
- titanium niobium oxide; lithium-ion batteries; capacity degradation; amorphization; carbon doping
- Issue Date
- 2022-04-23
- Publisher
- AMER CHEMICAL SOC
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v. 14, no 17, page. 19365-19375
- Abstract
- The limited capacity of graphite anodes in high-performance batteries has led to considerable interest in alternative materidk in recent years. Due to its high capacity, titanium niobium oxide (TiNb2O7, TNO) with a Wadsley-Roth crystallographic sheared structure holds great promise as a next-generation anode material, but a comprehensive understanding of TNO's electrochemical behavior is lacking. In particular, the mechanism responsible for the capacity fading of TNO remains poorly elucidated. Given its metastable nature (as an entropy-stabilized oxide) and the large volume change in TNO upon lithiation and delithiation, which has long been overlooked, the factors governing capacity fading warrant investigation. Our studies reveal that the structural weakness of TNO is fatal to the long-term cycling stability of TNO and that the capacity fading of TNO is driven by amorphization, which results in a significant increase in impedance. While nanostructuring can kinetically boost lithium intercalation, this benefit comes at the expense of capacity fading. Carbon doping in TNO can effectively suppress the critical impedance increase despite the amorphization, providing a possible remedy to the stability issue.
- URI
- https://pubs.acs.org/doi/10.1021/acsami.2c00589https://repository.hanyang.ac.kr/handle/20.500.11754/191886
- ISSN
- 1944-8244; 1944-8252
- DOI
- https://doi.org/10.1021/acsami.2c00589
- Appears in Collections:
- COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > CHEMICAL AND MOLECULAR ENGINEERING(화학분자공학과) > Articles
- Files in This Item:
- 2022.4_방진호_Carbon-Doped TiNb2O7 Suppresses Amorphization-Induced Capacity Fading.pdfDownload
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