Enhanced cycle ability of spinel LiMn2O4 by controlling the phase purity and structural strain

By applying the annealing step during the solid-state synthesis, well-crystallized spinel LiMn 2 O 4 with high phase purity was fabricated. The sensitive effect of heating procedure on the structural and electrochemical properties of LiMn 2 O 4 product was investigated. It was found that preheat-treatment-calcinations-annealing process can effectively eliminate the impurity phase. The post-annealing process also leads to a better crystalline and suitable strain for the LiMn 2 O 4 product, which contributes to the enhanced cycling performance.