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Choi, Nam-Soon
Energy Materials Lab
Research Interests
  • Rechargeable lithium battery, electrolytes for next generation Mg and Na battery

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Understanding voltage decay in lithium-excess layered cathode materials through oxygen-centred structural arrangement

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Title
Understanding voltage decay in lithium-excess layered cathode materials through oxygen-centred structural arrangement
Author
Myeong, SeungjunCho, WoongraeJin, WooyoungHwang, JaeseongYoon, MoonsuYoo, YoungshinNam, GyutaeJang, HaeseongHan, Jung-GuChoi, Nam-SoonKim, Min GyuCho, Jaephil
Issue Date
201808
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v.9, no., pp.3285 -
Abstract
Lithium-excess 3d-transition-metal layered oxides (Li1+xNiyCozMn1-x-y-zO2, > 250 mAh g(-1)) suffer from severe voltage decay upon cycling, which decreases energy density and hinders further research and development. Nevertheless, the lack of understanding on chemical and structural uniqueness of the material prevents the interpretation of internal degradation chemistry. Here, we discover a fundamental reason of the voltage decay phenomenon by comparing ordered and cation-disordered materials with a combination of X-ray absorption spectroscopy and transmission electron microscopy studies. The cation arrangement determines the transition metal-oxygen covalency and structural reversibility related to voltage decay. The identification of structural arrangement with de-lithiated oxygen-centred octahedron and interactions between octahedrons affecting the oxygen stability and transition metal mobility of layered oxide provides the insight into the degradation chemistry of cathode materials and a way to develop high-energy density electrodes.
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DOI
http://dx.doi.org/10.1038/s41467-018-05802-4
ISSN
2041-1723
Appears in Collections:
ECHE_Journal Papers
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