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Fluorinated Hyperbranched Cyclotriphosphazene Simultaneously Enhances the Safety and Electrochemical Performance of High‐Voltage Lithium‐Ion Batteries
Author(s) -
Kim ChoonKi,
Shin DongSeon,
Kim KoEun,
Shin Kyomin,
Woo JungJe,
Kim Saheum,
Hong Sung You,
Choi NamSoon
Publication year - 2016
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201600025
Subject(s) - materials science , faraday efficiency , electrolyte , anode , electrochemistry , thermal runaway , cathode , lithium (medication) , chemical engineering , battery (electricity) , graphite , electrode , lithium ion battery , high voltage , voltage , composite material , chemistry , electrical engineering , medicine , power (physics) , physics , quantum mechanics , engineering , endocrinology
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 5 V‐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.