Exploring the Effect of Cation Vacancies in TiO2: Lithiation Behavior of n-Type and p-Type TiO2
- Title
- Exploring the Effect of Cation Vacancies in TiO2: Lithiation Behavior of n-Type and p-Type TiO2
- Author
- 방진호
- Keywords
- n-TiO2; p-TiO2; storage; over-lithiation; vacancy; defect engineering
- Issue Date
- 2022-02
- Publisher
- American Chemical Society
- Citation
- ACS Applied Materials and Interfaces, v. 14, NO. 5, Page. 6560-6569
- Abstract
- TiO2 offers several advantages over graphite as an anode material for Li-ion batteries (LIBs) but suffers from low electrical conductivity and Li-diffusion issues. Control over defect chemistry has proven to be an effective strategy to overcome these issues. However, defect engineering has primarily been focused on oxygen vacancies (V-O). The role of another intrinsic TiO2 vacancy [i.e., titanium vacancies (V-Ti)] with regard to the Li+ storage behavior of TiO2 has largely evaded attention. Hence, a comparison of V-O- and V-Ti-defective TiO2 can provide valuable insight into how these two types of defects affect Li+ storage behavior. To eliminate other factors that may also affect the Li+ storage behavior of TiO2, we carefully devised synthesis protocols to prepare TiO2 with either V-O (n-TiO2) or V-Ti (p-TiO2). Both TiO2 materials were verified to have a very similar morphology, surface area, and crystal structure. Although V-O provided additional sites that improved the capacity at low C-rates, the benefit obtained from over-lithiation turned out to be detrimental to cycling stability. Unlike V-O, V-Ti could not serve as an additional lithium reservoir but could significantly improve the rate performance of TiO2. More importantly, the presence of VTi prevented over-lithiation, significantly improving the cycling stability of TiO2. We believe that these new insights could help guide the development of highperformance TiO2 for LIB applications.
- URI
- https://pubs.acs.org/doi/10.1021/acsami.1c20265https://repository.hanyang.ac.kr/handle/20.500.11754/181713
- ISSN
- 1944-8244;1944-8252
- DOI
- 10.1021/acsami.1c20265
- Appears in Collections:
- COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > CHEMICAL AND MOLECULAR ENGINEERING(화학분자공학과) > Articles
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