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A disordered rock-salt Li-excess cathode material with high capacity and substantial oxygen redox activity: Li1.25Nb0.25Mn0.5O2

Author(s)
Wang, RuiLi, XinLiu, LeiLee, JinhyukSeo, Dong-HwaBo, Shou-HangUrban, AlexanderCeder, Gerbrand
Issued Date
2015-11
DOI
10.1016/j.elecom.2015.08.003
URI
https://scholarworks.unist.ac.kr/handle/201301/30527
Fulltext
https://www.sciencedirect.com/science/article/pii/S1388248115002131?via%3Dihub
Citation
ELECTROCHEMISTRY COMMUNICATIONS, v.60, pp.70 - 73
Abstract
A disordered rocksalt Li-excess cathode material, Li1.25Nb0.25Mn0.5O2, was synthesized and investigated. It shows a large initial discharge capacity of 287 mAh g(-1) in the first cycle, which is much higher than the theoretical capacity of 146 mAh g(-1) based on the Mn3+/Mn4+ redox reaction. In situ X-ray diffraction (XRD) demonstrates that the compound remains cation-disordered during the first cycle. Electron energy loss spectroscopy (EELS) suggests that Mn and O are likely to both be redox active, resulting in the large reversible capacity. Our results show that Li1.25Nb0.25Mn0.5O2 is a promising cathode material for high capacity Li-ion batteries and that reversible oxygen redox in the bulk may be a viable way forward to increase the energy density of lithium-ion batteries.
Publisher
ELSEVIER SCIENCE INC
ISSN
1388-2481
Keyword (Author)
Lithium ion batteriesCathodeDisordered rocksaltLi-excessHigh capacity
Keyword
RECHARGEABLE LITHIUM BATTERIESX-RAY-ABSORPTIONLI-O-2 BATTERIESION BATTERIESOXIDESELECTRODESLI2O2

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