The Effects of the Heat Treatment on the Crystal Structure of LiMn₂O₄

Wen Yanxuan, Meng Lili^#
(School of Chemistry and Chemical Engineer, Guangxi University, Nanning, 530004)
(^# Chemistry Department, Guangxi Teachers College, Nanning, 530001)

Abstract In this paper, an investigation was carried out to study the effects of the heat treatment on the crystal structure of LiMn₂O₄. LiMn₂O₄ can be decomposed upon heating and the decomposed product can form LiMn₂O₄ again under cooling in air and O₂, which can be monitored using TG and XRD. After the heat treatment, the lattice parameter, the cell volume and the surface space of LiMn₂O₄ increase; but its density deceases. Temperature and atmosphere are main factors to affect the crystal structure of LiMn₂O₄ in the heat treatment.
Key words Lithium-ion batteries, Cathode material, LiMn₂O₄