Interfacial architectures derived by lithium difluoro(bisoxalato) phosphate for Li-rich cathodes with superior cycling stability and rate capability
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- Interfacial architectures derived by lithium difluoro(bisoxalato) phosphate for Li-rich cathodes with superior cycling stability and rate capability
- 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
- electrochemistry; interfaces; lithium; oxidation; surface chemistr
- Issue Date
- WILEY-V C H VERLAG GMBH
- CHEMELECTROCHEM, v.4, no.1, pp.56 - 65
- 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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