Roll-To-Roll Atomic Layer Deposition Of Titania Nanocoating On Thermally Stabilizing Lithium Nickel Cobalt Manganese Oxide Cathodes For Lithium Ion Batteries
ACS APPLIED ENERGY MATERIALS(2020)
摘要
Conformal coating of ceramic layers (nm-thick) on Ni-rich layered cathode materials is an effective strategy for improving high-temperature longevity of Li-ion batteries (LIBs). In this work, we develop a roll-to-roll atomic layer deposition (R2R ALD) apparatus for growing uniform nanolayers of TiO2. We explore the effect of ALD parameters (temperature: 120-180 degrees C and line speed: 2-40 mm s(-1)) on the TiO2 surface coating and subsequently investigate the electrochemical performance of the as-prepared cathodes. The capacity retention of TiO2 -coated porous electrodes is substantially improved compared to that of the pristine cathode material for high-temperature cycling. Electrochemical impedance spectroscopy confirms that the ALD-TiO2 coating suppresses the undesired side reactions initiated at the electrode/electrolyte interface, reduces charge transfer resistance, and ultimately facilitates the Li+ transport through the composite cathode nanostructure. The robust design of the ALD-TiO2 cathode material enables high-temperature operation (>55 degrees C) with enhanced specific capacity, superior rate capability, excellent cyclability, and ultra-high coulombic efficiency within a wide potential window (3.0-4.35 . The R2R ALD technique developed in this work paves the way for large-scale fabrication of ceramic-coated cathode sheets with a production rate reaching 2.4 m min(-1) for a continuous coating operation.
更多查看译文
关键词
roll-to-roll atomic layer deposition, titania layer, Ni-rich layered cathode, lithium ion battery, high temperature performance, continuous coating
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要