期刊
ACS NANO
卷 9, 期 1, 页码 464-473出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn505644q
关键词
atomic layer deposition; ruthenium oxide; conversion electrode; Li-ion battery; multiwalled carbon nanotubes
类别
资金
- Nanostructures for Electrical Energy Storage (NEES), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DESC0001160]
- L-3 Communications fellowship
Pushing lithium-ion battery (LIB) technology forward to its fundamental scaling limits requires the ability to create designer heterostructured materials and architectures. Atomic layer deposition (ALD) has recently been applied to advanced nanostructured energy storage devices due to the wide range of available materials, angstrom thickness control, and extreme conformality over high aspect ratio nanostructures. A class of materials referred to as conversion electrodes has recently been proposed as high capacity electrodes. RuO2 is considered an ideal conversion material due to its high combined electronic and ionic conductivity and high gravimetric capacity, and as such is an excellent material to explore the behavior of conversion electrodes at nanoscale thicknesses. We report here a fully characterized atomic layer deposition process for RuO2, electrochemical cycling data for ALD RuO2, and the application of the RuO2 to a composite carbon nanotube electrode scaffold with nucleation-controlled RuO2 growth. A growth rate of 0.4 angstrom/cycle is found between similar to 210-240 degrees C. In a planar configuration, the resulting RuO2 films show high first cycle electrochemical capacities of similar to 1400 mAh/g, but the capacity rapidly degrades with charge/discharge cycling. We also fabricated core/shell MWCNT/RuO2 heterostructured 3D electrodes, which show a 50 x increase in the areal capacity over their planar counterparts, with an areal lithium capacity of 1.6 mAh/cm(2).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据