Improved electrochemical reversibility of over-lithiated layered Li2RuO3 cathodes: Understanding aliovalent Co3+ substitution with excess lithium
- Authors
- Arunkumar, Paulraj; Jeong, Woo Jin; Won, Seob; Im, Won Bin
- Issue Date
- Aug-2016
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Li-ion battery; Cobalt content; Cathode material; Li2RuO3; Rate performance
- Citation
- JOURNAL OF POWER SOURCES, v.324, pp.428 - 438
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF POWER SOURCES
- Volume
- 324
- Start Page
- 428
- End Page
- 438
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/22241
- DOI
- 10.1016/j.jpowsour.2016.05.013
- ISSN
- 0378-7753
- Abstract
- Over-lithiated layered Li2+xRu1-xCoxO3 (x = 0, 0.1, 0.2, and 0.5) cathodes were synthesized through a solid-state reaction, which exhibits a superlattice structure. We investigated the effects of aliovalent Co3+ doping with excess lithium on the structural and electrochemical properties of layered Li2RuO3 cathodes. X-ray diffraction suggests the formation of a solid-solution where Co3+ occupies the Ru4+ sites in the transition metal layer while maintaining the layered Li2RuO3 structure. The electrochemical results indicate an enhanced electrochemical lithium reversibility of the cathodes at high C-rates (1C) than the pristine Li2RuO3. In particular, the high-performance Li2.1Ru0.9Co0.1O3 cathode delivered an initial capacity of 250 mAh g(-1) with an enhanced Li+ extraction of 0.66 mol (52% capacity retention) after 100 cycles at 1C compared to the 0.28 mol of Li+ extraction (21% capacity retention) associated with the pristine Li2RuO3. Low content of Co3+ could realize an enhanced reversible Li+ extraction that originated from the improved reversible anionic redox chemistry, cation ordering with superlattice structure, and facile charge transfer process. The role of Co3+ content on the lithium reversibility of over-lithiated layered cathodes, containing excess lithium were investigated.
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