Three-Dimensional Si-Based Composite Nanorods Array Applied in Energy Storage System
In this work, the electrochemical performances of 3D hexagonal match-like Si/Ge nanorod (NR) arrays buffered by TiN/Ti interlayer, which were fabricated by a cost-effective, wafer scale and Si-compatible process, were demonstrated and systematically investigated as the anode in rechargeable batteries. The optimized Si/TiN/Ti/Ge composite NR array anode displays superior areal/specific capacities and cycling stability by reason of their favourable 3D nanostructures and the effective conductive layers of TiN/Ti thin films. Lithium/Sodium ion insertion behaviors were experimentally investigated in post-morphologies and elemental information of the cycled composite anode, and theoretically studied by the first principles calculation upon the adsorption and diffusion energies of sodium in Ge unit cell. The preferential diffusion of Lithium/sodium in Ge structure over in Si lattice was evidently proved.
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