S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Tunable and robust phosphite-derived surface film to protect lithium-rich cathodes in lithium-ion batteries
- Han, Jung-Gu; Lee, Sung Jun; Lee, Jaegi; Kim, Jeom-Soo; Lee, Kyu Tae; Choi, Nam-Soon
- Issue Date
- ACS Applied Materials and Interfaces, Vol.7 No.15, pp.8319-8329
- electrolyte additive; tris(trimethylsilyl) phosphite; solid electrolyte interphase; lithium-rich layered cathode; lithium-ion battery
- 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.
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