Fabrication of TiNb2O7 thin film electrodes for Li-ion micro-batteries by pulsed laser deposition

The TiNb2O7 thin film electrodes as anode material in Li-ion rechargeable micro-batteries are successfully demonstrated. The pulsed laser deposited TiNb2O7 thin film electrode delivers high discharge specific capacity of 143 μAh μm−1 cm−2 at 50 μA cm−2 current density, with 92% coulombic efficiency. The thin films are very stable in crystal structure, with good fast reversible reaction at average Li-insertion voltage 1.65 V.