Engineering the surface of LiCoO2 electrodes using atomic layer deposition for stable high-voltage lithium ion batteries
Engineering the surface of LiCoO2 electrodes using atomic layer deposition for stable high-voltage lithium ion batteries作者机构：Department of Materials Science and Engineering Stanford University Stanford CA 94305 USA Department of Applied Physics Stanford University Stanford CA 94305 USA Department of Materials Science and Engineering Stanford University Stanford CA 94305 USA Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo Park CA 94025 USA
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2017年第10卷第11期
页 面：3754-3764页
核心收录：
学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学]
基 金：Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung SNF
主 题：Lithium ion batteries lithium cobalt oxide atomic layer deposition
摘 要：Developing advanced technologies to stabilize positive electrodes of lithium ion batteries under high-voltage operation is becoming increasingly important,owing to the potential to achieve substantially enhanced energy density for applications such as portable electronics and electrical ***,we deposited chemically inert and ionically conductive LiAlO2 interfacial layers on LiCoO2 electrodes using the atomic layer deposition *** prolonged cycling at high-voltage,the LiAlO2 coating not only prevented interfacial reactions between the LiCoO2 electrode and electrolyte,as confirmed by electrochemical impedance spectroscopy and Raman characterizations,but also allowed lithium ions to freely diffuse into LiCoO2 without sacrificing the power *** a result,a capacity value close to 200 mA＆#183;h＆#183;g-1 was achieved for the LiCoO2 electrodes with commercial level loading densities,cycled at the cut-off potential of 4.6 V ***＋/Li for 50 stable cycles;this represents a 40% capacity gain,compared with the values obtained for commercial samples cycled at the cut-off potential of 4.2 V ***＋/Li.
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