Enhanced Electrochemical Performance of Cu2+ doped TiO2 Nanoparticles for Lithium-ion Battery

Xiao-Chong Zhao 1

Pan Yang 1

Li-Jun Yang 1

Yu Cheng 1, 3

Hui-Yuan Chen 3

Hu Liu 4, 5

Gang Wang 2, Email

Vignesh Murugadoss 4, 6

Subramania Angaiah 6, Email

Zhanhu Guo 4, Email

Institute of Materials, China Academy of Engineering Physics, Mianyang 621908, Sichuan China
Institute of Chemical Engineering, Qinghai University, Xining 810016 China
Qinghai Nationalities University, Xining 810007 China
Integrated Composites Laboratory (ICL), Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996 USA
National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002 China
Electrochemical Energy Research Lab, Centre for Nanoscience and Technology, Pondicherry University, Puducherry – 605 014 India

Abstract

TiO2 nanoparticles doped with Cu2+ are synthesized via a facile one-step solvothermal method with a uniform distribution of 50-60 nm. The X-ray photoelectron spectroscopy (XPS) results show that the Cu2+ are doped in the TiO2 crystal lattice uniformly. Due to the smooth replacement of the part of Ti4+ sites by Cu2+ in the samples, more Ti4+ vacancies are formed, which is a benefit to the Li+ diffusion and enhanced electrochemical properties. At the 5 C rate, the initial discharge capacity of TiO2 doped with 6 wt% Cu2+ reaches 83.4 mAhg-1. After 100 charge-discharge cycles, the discharge capacity is still 76.5 mAhg-1, showing a good cycling stability.

Enhanced Electrochemical Performance of Cu2+ doped TiO2 Nanoparticles for Lithium-ion Battery