Improving electrochemical performance by Na, Mg and Al-ion doping of PbLi2Ti6O14 as anode materials for Li-ion batteries

Abstract

In recent years, titanium-based oxides have attracted great attention in the research field of secondary Li-ion batteries. However, they suffer from poor electronic conductivity due to a huge band gap. In this paper, PbLi2Ti6O14 is fabricated by a simple one-step solid-state reaction method. To enhance its conductance and Li-storage capability, PbLi1.95Na0.05Ti6O14, PbLi1.95Mg0.05Ti6O14 and PbLi1.95Al0.05Ti6O14 are fabricated by Na, Mg and Al-ion doping. More impressively, PbLi1.95Al0.05Ti6O14 presents a superior reversible capability with a reversible charge capacity of 152.8mAhg−1 after 100 cycles at current density 100mAg−1. In addition, it also clearly demonstrates that PbLi1.95Al0.05Ti6O14 has good structural stability and electrochemical reversibility by in situ XRD observation. Besides, it also presents a high Li-ion diffusion coefficient of 1.978 × 10–12cm2s−1. All of these make it possible to become a superior performance anode material for Li-ion batteries.