A First-Cycle Coulombic Efficiency Higher than 100% Observed for a Li2MO3 (M = Mo or Ru) Electrode
- Authors
- Jang, Jihyun; Kim, Youngjin; Chae, Oh B.; Yoon, Taeho; Kim, Sang-Mo; Kim, Hyun-seung; Park, Hosang; Ryu, Ji Heon; Oh, Seung M.
- Issue Date
- Sep-2014
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- Coulombic efficiency; electrochemistry; energy conversion; lithium-ion batteries; metal oxide electrode
- Citation
- ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.53, no.40, pp.10654 - 10657
- Journal Title
- ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
- Volume
- 53
- Number
- 40
- Start Page
- 10654
- End Page
- 10657
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/87349
- DOI
- 10.1002/anie.201404510
- ISSN
- 1433-7851
- Abstract
- The lithiation/de-lithiation behavior of a ternary oxide (Li2MO3, where M = Mo or Ru) is examined. In the first lithiation, the metal oxide (MO2) component in Li2MO3 is lithiated by a conversion reaction to generate nano-sized metal (M) particles and two equivalents of Li2O. As a result, one idling Li2O equivalent is generated from Li2MO3. In the delithiation period, three equivalents of Li2O react with M to generate MO3. The first-cycle Coulombic efficiency is theoretically 150% since the initial Li2MO3 takes four Li+ ions and four electrons per formula unit, whereas the M component is oxidized to MO3 by releasing six Li+ ions and six electrons. In practice, the first-cycle Coulombic efficiency is less than 150% owing to an irreversible charge consumption for electrolyte decomposition. The as-generated MO3 is lithiated/de-lithiated from the second cycle with excellent cycle performance and rate capability.
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