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

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Fluorinated Hyperbranched Cyclotriphosphazene Simultaneously Enhances the Safety and Electrochemical Performance of High-Voltage Lithium-Ion Batteries

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Title
Fluorinated Hyperbranched Cyclotriphosphazene Simultaneously Enhances the Safety and Electrochemical Performance of High-Voltage Lithium-Ion Batteries
Author
Kim, Choon-KiShin, Dong-SeonKim, Ko-EunShin, KyominWoo, Jung-JeKim, SaheumHong, Sung YouChoi, Nam-Soon
Keywords
Electrochemical performance; Electrolyte; Flame retardant; Lithium-ion batteries; Thermal stability
Issue Date
201606
Publisher
WILEY-V C H VERLAG GMBH
Citation
CHEMELECTROCHEM, v.3, no.6, pp.913 - 921
Abstract
As high-energy-density lithium-ion batteries (LIBs) are being developed, their thermal stability problems become more apparent. In spite of elaborate precautions, exothermic reactions between electrolytes and electrode materials at elevated temperatures can lead to battery explosion. In this study, we introduce a novel flame-retardant additive with a fluorinated hyperbranched cyclotriphosphazene structure for high-voltage LIBs. Along with the effective reduction of flammability, it enhances the electrochemical performance by generating a thermally and electrochemically stable solid electrolyte interphase on both the cathode and the anode, which is rare for conventional additives. In full cells composed of a 5V-class spinel cathode and a graphite anode with practical-level mass loading, this new additive demonstrates significant improvements in discharge capacity retention and coulombic efficiency during cycle testing.
URI
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DOI
http://dx.doi.org/10.1002/celc.201600025
ISSN
2196-0216
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