Siyu Zhou, Jixiang Yang, Cheng Zhen, M. Danny Gu, Minhua Shao
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引用次数: 0
Abstract
Stabilizing LiCoO2 (LCO) cathode at high voltages is still challenging in lithium-ion batteries (LIBs). Although fluorinated solvents are utilized in high-voltage systems for their superior oxidation resistance, linear fluorinated carbonates still undergo elimination reactions at high voltages, producing corrosive substances that compromise electrode materials. This study addresses the elimination reaction of methyl trifluoroethyl carbonate (FEMC) by incorporating tris(trimethylsilyl)-based additives, thereby constructing a homogeneous and robust polymer-rich cathode-electrolyte interphase (CEI). With the incorporation of tris(trimethylsilyl)phosphite in the optimized electrolyte, the capacity of the coin cell with LCO as the cathode can maintain 95% after 500 cycles with a high cut-off voltage of 4.6 V. This study establishes a foundational framework for employing linear fluorocarbonates in high-voltage systems and provides innovative insights into CEI design and construction.
期刊介绍:
Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.