期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 15, 页码 8319-8329出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b01770
关键词
electrolyte additive; tris(trimethylsilyl) phosphite; solid electrolyte interphase; lithium-rich layered cathode; lithium-ion battery
资金
- IT R&D program of MOTIE/KEIT [KI001810046309]
- Energy Efficiency & Resources of the Korea Institute of Energy Technology Evaluation and Planning - Korean Ministry of Knowledge Economy [20112010100140]
- National Research Foundation of Korea - Korean Government (MEST) [NRF-2013-C1AAA001-0030538]
- Industrial Strategic technology development program - Ministry of Trade, Industry & Energy (MI, Korea) [10050477]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10050477, 10046306] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2011-0030544] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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