Structure and electrochemical performance of spinel LiMn2O4 synthesized by mechanochemical process
(School of Metallurgical Science and Engineering, Central South University,
Changsha 410083, China)
Changsha 410083, China)
Abstract: Spinel LiMn2O4 of cathode materials for lithium rechargeable batteries were synthesized by mechanochemical process, using Li2CO3 and different manganese compounds as EMD, Mn2O3 and Mn3O4. The influence of technological conditions on the phase structure and electrochemical performance of samples were systematically investigated by XRD, SEM, BET and constant current cyclic tests, respectively. It is found that the species of manganese compounds have strong effect on the structure and electrochemical performance of the final products. All the final products show spinel structure but their crystallization has feeble difference. And sample from Mn2O3 shows a typical octahedron shape. The initial discharge capacities of the samples are 131.44mA•h/g(made by EMD), 126.17mA•h/g(made by Mn2O3) and 126.34mA•h/g(made by Mn3O4), respectively. The product made by EMD shows well cyclic capability, and it can be used as a promising cathode material for 4V lithium batteries.
Key words: manganese source; lithium ion battery; LiMn2O4; mechanochemistry