Nanostructured materials for high-performance Li-ion rechargeable batteries

Document Type

Conference Proceeding

Publication Date

8-25-2011

Abstract

We synthesized amorphous and crystalline TiO2 nanotube arrays of different phases for applications in high-performance Li-ion rechargeable batteries. TiO2 nanotubes of different phases are compared for electrochemical properties and they all demonstrate significantly higher capacities than TiO2 compact layer. The amorphous TiO2 nanotubes with a length of 1.9 μm exhibit a capacity five times higher than that of TiO2 compact layer even when the nanotube array is cycled at a current density 80 times higher than that for the compact layer. Furthermore, TiO2 nanotubes of different dimensions are systematically studied for correlations between nanostructure dimensions and electrochemical performances. In another project, we employed atomic layer deposition (ALD) technique to deposit nanosized-thin Al2O3 coatings onto LiMn2O4 cathodes to improve the cycling performances. The ALD-coated LiMn2O4 shows enhanced cycleability than bare cathode or coated cathode via wet chemistry methods, as the ALD coating is dense, pinhole-free, highly conformal, and provides full coverage.

Publication Source (Journal or Book title)

ACS National Meeting Book of Abstracts

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