原子层沉积
材料科学
阴极
法拉第效率
涂层
介电谱
锂(药物)
电解质
化学工程
电极
电化学
纳米技术
图层(电子)
化学
医学
工程类
内分泌学
物理化学
作者
Chien Te Hsieh,Chia Hung Chao,Wen Jie Ke,Yeou Fu Lin,Hao Wei Liu,Yasser Ashraf Gandomi,Siyong Gu,Chung-Yen Su,Jeng Kuei Chang,Jianlin Li,Chun Chieh Fu,Bikash Chandra Mallick,Ruey‐Shin Juang
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2020-11-11
卷期号:3 (11): 10619-10631
被引量:13
标识
DOI:10.1021/acsaem.0c01541
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 °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 °C) with enhanced specific capacity, superior rate capability, excellent cyclability, and ultra-high coulombic efficiency within a wide potential window (3.0–4.35 V). 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.
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