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Published on: November 11, 2013
Regulating cathode electrical double layer via electrolyte engineering for stable cycling of NCM811 cathode at 4.8 V
Rui Qu1, Anran Zhang1, Wenxi Hu2
1International School of Materials Science and Engineering, School of Materials Science and Microelectronics, Wuhan University of Technology, Wuhan 430070, P. R. China. youya@whut.edu.cn.
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A novel electrolyte formulation is rationally designed in this work to regulate the cathode electrical double layer (EDL), which enables the LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode to realize stable cycling at a high charge cutoff voltage of 4.8 V with superior capacity retention. The core design principle lies in the construction of an inner Helmholtz plane (IHP) that can form an anion-dominated cathode electrolyte interphase (CEI) on the NCM811 surface. This work pioneers a new "EDL engineering" strategy, which provides a promising strategy for the development of high-voltage lithium-ion batteries (LIBs) with excellent cycling stability.
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