Controllable Solid Electrolyte Interphase in Nickel-Rich Cathodes by an Electrochemical Rearrangement for Stable Lithium-Ion Batteries.

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Advanced materials (Deerfield Beach, Fla.), ISSN: 1521-4095, Vol: 30, Issue: 5

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Kim, Junhyeok; Lee, Jieun; Ma, Hyunsoo; Jeong, Hu Young; Cha, Hyungyeon; Lee, Hyomyung; Yoo, Youngshin; Park, Minjoon; Cho, Jaephil
Wiley-Blackwell; WILEY-V C H VERLAG GMBH
Materials Science; Engineering; artifi cial solid electrolyte interphase (SEI) layers; batteries; electrolyte wettability; nickel-rich cathodes
article description
The layered nickel-rich materials have attracted extensive attention as a promising cathode candidate for high-energy density lithium-ion batteries (LIBs). However, they have been suffering from inherent structural and electrochemical degradation including severe capacity loss at high electrode loading density (>3.0 g cm ) and high temperature cycling (>60 °C). In this study, an effective and viable way of creating an artificial solid-electrolyte interphase (SEI) layer on the cathode surface by a simple, one-step approach is reported. It is found that the initial artificial SEI compounds on the cathode surface can electrochemically grow along grain boundaries by reacting with the by-products during battery cycling. The developed nickel-rich cathode demonstrates exceptional capacity retention and structural integrity under industrial electrode fabricating conditions with the electrode loading level of ≈12 mg cm and density of ≈3.3 g cm . This finding could be a breakthrough for the LIB technology, providing a rational approach for the development of advanced cathode materials.