High Performance Li2Ru1−yMnyO3 (0.2 ≤ y ≤ 0.8) Cathode Materials for Rechargeable Lithium-Ion Batteries: Their Understanding
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
View Archive Info| Field | Value | |
| Title |
High Performance Li2Ru1−yMnyO3 (0.2 ≤ y ≤ 0.8) Cathode Materials
for Rechargeable Lithium-Ion Batteries: Their Understanding
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| Creator |
Sathiya, M.
Ramesha, K. Rousse, G. Foix, D. Gonbeau, D. Prakash , A.S. Doublet, M.L. Hemalatha, K. Tarascon, J.M. |
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| Subject |
Lithium batteries
Electrochemical Power Sources |
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| Description |
Understanding the origin of the high capacity
displayed by Li2MnO3−LiMO2 (M = Ni, Co) composites is essential
for improving their cycling and rate capability performances. To
address this issue, the Li2Ru1−yMnyO3 series between the iso-structural
layered end-members Li2MnO3 and Li2RuO3 was investigated. A
complete solid solution was found, with the 0.4 ≤ y ≤ 0.6 members
showing sustainable reversible capacities exceeding 220 mAh·g−1
centered around 3.6 V vs Li+/Li. The voltage−composition profiles
display a plateau on the first charge as compared to an S-type curve on
subsequent discharge which is maintained on the following charges/discharges, with therefore a lowering of the average voltage.
We show this profile to evolve upon long cycling due to a structural phase transition as deduced from XRD measurements.
Finally we demonstrate, via XPS measurements, the oxidation and reduction of ruthenium (Ru5+/Ru4+) during cycling together
with a partial activity of the Mn4+/Mn3+ redox couple. Moreover, we provide direct evidence for the reversibility of the O2− →
O− anionic process upon cycling, hence accounting for the high capacity displayed by these materials. This work, by capturing the
main redox processes pertaining to these materials, should facilitate their development
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| Publisher |
American Chemical Society
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| Date |
2013
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cecri.csircentral.net/3114/1/081-2013.pdf
Sathiya, M. and Ramesha, K. and Rousse, G. and Foix, D. and Gonbeau, D. and Prakash , A.S. and Doublet, M.L. and Hemalatha, K. and Tarascon, J.M. (2013) High Performance Li2Ru1−yMnyO3 (0.2 ≤ y ≤ 0.8) Cathode Materials for Rechargeable Lithium-Ion Batteries: Their Understanding. Chemistry of Materials, 25. pp. 1121-1131. ISSN 0897-4756 |
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| Relation |
http://www.pubs.acs.org/cm
http://cecri.csircentral.net/3114/ |
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