Li ion batteries provide a viable power source for numerous applications including but not limited to mobile devices, laptop computers and electric vehicles. The demand for more complex technologies continues to increase the need for smaller, lighter and higher capacity Li ion batteries.  Using nanotechnology to improve Li ion battery performance has gained significant interest as battery applications continue to grow.  These unique properties appear dependent on the amount of surface area exposed by the nanomaterial.  Using techniques that increase an electrode material's surface area should result in more electrode-electrolyte contact, Li ion intercalation and ultimately higher capacities.  Anodized aluminum oxide (AAO) nanoporous membranes having pores that are 200 nm in diameter were used as templates to make a LiCoO2 nanostructured electrode material.  The nanostructured LiCoO2 was formed by using RF magnetron sputtering of the lithium ion electrode material on the AAO template, and this nanofabrication technique makes an electrode system in a configuration that is immediately ready for thin film battery applications. These nanoporous electrodes exhibit six times the surface area of traditional thin film electrodes, making for increased electrode-electrolyte contact.  The resulting enhanced electrode performance will be discussed. The characterization techniques used to study nanostructured LiCoO2 include ac impedance, infrared and Raman spectroscopy.  The crystal structure was studied using X-ray diffraction and surface structure was investigated by atomic force microscopy and scanning electron microscopy.  SEM was used to investigate the structure change upon lithium deintercalation (charging) and intercalation (discharging).  Nanostructured LiCoO2 cathodes will be discussed in comparison to a standard thin-film cathode with no nanostructuring.

Nanofabricated, nanostructured LiCoO<sub>2</sub> thin film cathode for Li ion batteries

247th National Meeting (2014)

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Nanofabricated, nanostructured LiCoO2 thin film cathode for Li ion batteries

Nanofabricated, nanostructured LiCoO₂ thin film cathode for Li ion batteries