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Interfacial Architectures Derived by Lithium Difluoro(bisoxalato) Phosphate for Lithium‐Rich Cathodes with Superior Cycling Stability and Rate Capability
Author(s) -
Han JungGu,
Park Inbok,
Cha Jiho,
Park Suhyeon,
Park Sewon,
Myeong Seungjun,
Cho Woograe,
Kim SungSoo,
Hong Sung You,
Cho Jaephil,
Choi NamSoon
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201600297
Subject(s) - electrolyte , lithium (medication) , cathode , x ray photoelectron spectroscopy , chemical engineering , materials science , spinel , lithium iron phosphate , phosphate , inorganic chemistry , chemistry , electrochemistry , electrode , organic chemistry , metallurgy , engineering , endocrinology , medicine
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.