Ultra-High Capacity of Li1.6-Xmn0.4tixo2 as a Cathode Material

Abstract

Cation-Disordered Li-Excess cathode material with an initial capacity over 300 mAh/g have drawn great attention as cathode materials for lithium batteries. In this work, Li 1.3 Mn 0.4 Ti 0.3 O 2 cathode material with superior capacity was synthesized through the effective content adjustment of Li and Ti by ball milling combined with a high-temperature solid-state method. The synthesized Li 1.3 Mn 0.4 Ti 0.3 O 2 possessed high crystallinity with a uniform particle size. The initial capacity reached 334.9, 230.5 and 127.3 mAh/g at current densities of 10, 50, and 100 mA/g, respectively. The oxidation-reduction of Mn 3+ /Mn 4+ , Mn 2+ /Mn 3+ and O 2- /O - , contributed to the ultrahigh capacity of Li 1.3 Mn 0.4 Ti 0.3 O 2 was investigated by electrochemical characterization. The density of states in Li 1.3 Mn 0.4 Ti 0.3 O 2 was studied by density functional theory based calculations. The experimental results show that Li 1.3 Mn 0.4 Ti 0.3 O 2 could be promising cathode material for high-energy-density lithium batteries.

Keywords: Lithium-ion Batteries, Cathode Materials, Lithium-rich manganates