Concentration Gradient Induced Delithiation Failure of MoO3 for Li-Ion Batteries
- Authors
- Jang, Jihyun; Kim, Hyun-seung; Moon, San; Chae, Oh B.; Ahn, Sung-Jin; Jung, Heechul; Choi, Junghyun; Oh, Seung M.; Ryu, Ji Heon; Yoon, Taeho
- Issue Date
- Jan-2022
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Li-ion batteries; transition metal oxides; molybdenum oxides; conversion reactions; concentration gradients
- Citation
- NANO LETTERS, v.22, no.2, pp.761 - 767
- Journal Title
- NANO LETTERS
- Volume
- 22
- Number
- 2
- Start Page
- 761
- End Page
- 767
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/87303
- DOI
- 10.1021/acs.nanolett.1c04290
- ISSN
- 1530-6984
- Abstract
- Electric vehicle manufacturers worldwide are demanding superior lithium-ion batteries, with high energy and power densities, compared to gasoline engines. Although conversion-type metal oxides are promising candidates for high-capacity anodes, low initial Coulombic efficiency (ICE) and poor capacity retention have hindered research on their applications. In this study, the ICE of conversion-type MoO3 is investigated, with a particular focus on the delithiation failure. A computational modeling predicts the concentration gradient of Li+ in MoO3 particles. The highly delithiated outer region of the particle forms a layer with low electronic conductivity, which impedes further delithiation. A comparative study using various sizes of MoO3 particles demonstrated that the electrode failure during delithiation is governed by the concentration gradient and the subsequent formation of a resistive shell. The proposed failure mechanism provides critical guidance for the development of conversion-type anode materials with improved electrochemical reversibility.
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