Effect of Mg doping on the local structure of LiMgyCo1yO2 cathode material investigated by X-ray absorption spectroscopy
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
View Archive Info| Field | Value | |
| Title |
Effect of Mg doping on the local structure of LiMgyCo1yO2 cathode material investigated by X-ray absorption spectroscopy
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| Creator |
Cheng, J.H.
Pan, C.J. Nithya, C. Thirunakaran, R. Gopukumar, S. Chen, C.H. Lee, J.F. Chen, J.M. Sivashanmugam, A. Hwang, B.J. |
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| Subject |
Lithium batteries
Electrochemical Power Sources |
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| Description |
A higher capacity and better cyclability are apparent when magnesium is introduced into the structure of
LiCoO2 (y ¼ 0.15). XRD analysis of LiMgyCo1�yO2 (y ¼ 0, 0.1, 0.15), synthesized at 800 �C using a microwave
assisted method, shows that the material is in the R-3m space group and to have a slightly
expanded unit cell that increases with greater magnesium doping. Structural analysis by X-ray absorption
spectroscopy (XAS) at the Co K-edge, L-edge and O K-edge shows that the magnesium is located in
the transition metal layer rather than in the lithium layer and the charge balance results from the formation
of oxygen vacancies rather than Co4þ, while cobalt remains in the 3þ oxidation state. Interestingly,
oxygen is found to participate in the charge compensation. Both magnesium, in the transition
metal layer, and the Co-defect structure are attributed to the contribution towards structural stabilization
of LiCoO2, thereby resulting in its enhanced electrochemical performance.
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| Publisher |
Elsevier B.V.
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| Date |
2014
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cecri.csircentral.net/3049/1/003-2014.pdf
Cheng, J.H. and Pan, C.J. and Nithya, C. and Thirunakaran, R. and Gopukumar, S. and Chen, C.H. and Lee, J.F. and Chen, J.M. and Sivashanmugam, A. and Hwang, B.J. (2014) Effect of Mg doping on the local structure of LiMgyCo1yO2 cathode material investigated by X-ray absorption spectroscopy. Journal of Power Sources, 252. pp. 292-297. ISSN 0378-7753 |
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| Relation |
http://www.elsevier.com/locate/jpowsour
http://cecri.csircentral.net/3049/ |
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