2, Purdue University, Lafayette, Indiana, United States
Lithium-ion batteries are promising battery technologies to provide high energy and high power for applications such as electric vehicles or electrical grids. Recent studies have observed that lithium-ion battery electrode materials (e.g. TiO2) containing intentional structural defects exhibit enhanced electrochemical charge storage capacity. In this work we investigate the irradiation effect on structure and electrochemical response of TiO2 nanotubes through proton ion irradiations, because irradiation is known to produce an excess of defects in a material. In addition, we invetigated heavy ion irradiation on TiO2 single crystals to elucidate the effects if irradiating species and crystallographic orientation on defect production and microstructure evolution. We have observed defect generation upon irradiation in both nanostructured and single crystal TiO2 samples and changes in electrochemical response in nanostructured TiO2 anode.