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Tunable and robust phosphite-derived surface film to protect lithium-rich cathodes in lithium-ion batteries

Cited 92 time in Web of Science Cited 93 time in Scopus
Authors
Han, Jung-Gu; Lee, Sung Jun; Lee, Jaegi; Kim, Jeom-Soo; Lee, Kyu Tae; Choi, Nam-Soon
Issue Date
2015-04
Citation
ACS Applied Materials and Interfaces, Vol.7 No.15, pp.8319-8329
Keywords
electrolyte additivetris(trimethylsilyl) phosphitesolid electrolyte interphaselithium-rich layered cathodelithium-ion battery
Abstract
A thin, uniform, and highly stable protective layer tailored using tris(trimethylsilyl) phosphite (TMSP) with a high tendency to donate electrons is formed on the Li-rich layered cathode, Li1.17Ni0.17Mn0.5Co0.17O2. This approach inhibits severe electrolyte decomposition at high operating voltages during cycling and dramatically improves the interfacial stability of the cathode. The TMSP additive in the LiPF6-based electrolyte is found to preferentially eliminate HF, which promotes the dissolution of metal ions from the cathode. Our investigation revealed that the TMSP-derived surface layer can overcome the significant capacity fading of the Li-rich cathode by structural instability ascribed to an irreversible phase transformation from layered to spinel-like structures. Moreover, the superior rate capability of the Li-rich cathode is achieved because the TMSP-originated surface layer allows facile charge transport at high C rates for the lithiation process.
ISSN
1944-8244
URI
https://hdl.handle.net/10371/171862
DOI
https://doi.org/10.1021/acsami.5b01770
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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