Mg-doped Li2ZnTi3O8/C as high-performance anode materials for lithium-ion batteries

Abstract

Mg-doped Li2ZnTi3O8/C samples have been studied as anode substances for lithium-ion batteries have been organized by means of a simple sol-gel technique and calcined with the aid of a microwave tube sintering furnace. The binding energy and lattice change of Li2ZnTi3O8 are minimized when Mg replaces Zn (Zn↔Mg) is known by DFT calculations, so Mg2+ is doped in the Li2ZnTi3O8 lattice by replacing Zn2+, which can be demonstrated by XRD, TEM, and XPS spectroscopy in addition. CV and EIS show that the doping of Mg2+ provides a stable and fast transport channel for Li+ and in this way improves the ionic and electronic conductivity of Li2ZnTi3O8/C and further reduces the polarization. The Mg-doped Li2ZnTi3O8/C exhibits excellent cycling and rate performance, exhibiting high charge/discharge capacity of 307.6/306.5 mAh g−1 after 900 cycles at a current density of 0.2 A g−1.