Interfacial Architectures Derived by Lithium Difluoro(bisoxalato) Phosphate for Lithium-Rich Cathodes with Superior Cycling Stability and Rate Capability

Citation data:

ChemElectroChem, ISSN: 2196-0216, Vol: 4, Issue: 1, Page: 56-65

Publication Year:
2017
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Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/21219
DOI:
10.1002/celc.201600297
Author(s):
Han, Jung-Gu; Park, Inbok; Cha, Jiho; Park, Suhyeon; Park, Sewon; Myeong, Seungjun; Cho, Woograe; Kim, Sung-Soo; Hong, Sung You; Cho, Jaephil; Choi, Nam-Soon Show More Hide
Publisher(s):
Wiley; WILEY-V C H VERLAG GMBH
Tags:
Chemical Engineering; Chemistry; electrochemistry; interfaces; lithium; oxidation; surface chemistr
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article description
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 gat 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.