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Hong, Sung You
Synthetic Organic Chemistry Laboratory
Research Interests
  • Synthetic organic chemistry, transition metals, oxidation state

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Interfacial architectures derived by lithium difluoro(bisoxalato) phosphate for Li-rich cathodes with superior cycling stability and rate capability

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Title
Interfacial architectures derived by lithium difluoro(bisoxalato) phosphate for Li-rich cathodes with superior cycling stability and rate capability
Author
Han, Jung-GuPark, InbokCha, JihoPark, SuhyeonPark, SewonMyeong, SeungjunCho, WoograeKim, Sung-SooHong, Sung YouCho, JaephilChoi, Nam-Soon
Keywords
electrochemistry; interfaces; lithium; oxidation; surface chemistr
Issue Date
201701
Publisher
WILEY-V C H VERLAG GMBH
Citation
CHEMELECTROCHEM, v.4, no.1, pp.56 - 65
Abstract
Lithium difluoro(bisoxalato)phosphate (LiDFBP) is introduced as a novel lithium-salt-type electrolyte additive for lithium-rich cathodes in lithium-ion batteries. The investigation reveals that LiDFBP is oxidized to form a uniform and electrochemically stable solid electrolyte interphase (SEI) on the lithium-rich cathode. The LiDFBP-derived SEI layer effectively suppresses severe electrolyte decomposition at high voltages and mitigates the voltage decay of the lithium-rich cathodes caused by undesirable phase transformation to spinel-like phases during cycling. Furthermore, the cell with electrolyte containing LiDFBP achieves substantially improved cycling performance and delivers a high discharge capacity of 116 mA h g−1 at a high C rate (20 C). The unique function of the LiDFBP additive on the surface chemistry of lithium-rich cathodes is confirmed through X-ray photoelectron spectroscopy, SEM, and TEM analyses.
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DOI
http://dx.doi.org/10.1002/celc.201600297
ISSN
2196-0216
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