A Novel Manganese-Based Lithium-Intercalated Cathode Material with High Cyclic Stability for Lithium-Ion Batteries

摘要

Manganese-based lithium-intercalated oxide is one of the most promising cathode materials for rechargeable lithium-ion batteries, especially in the field of large-scale energy storage and conversion, due to its rich and cheap raw material and easy preparation. However, this material usually suffers from unsatisfactory cyclic stability. In this work, we reported a novel manganese-based lithium-intercalated cathode material, Li[Li0.1305Ni0.3043Mn0.5652]O-2, with high cyclic stability. This material was prepared by using MnO2 nanorods as the precursor for the formation of transition metal hydroxide (Ni0.35Mn0.65(OH)(2)), and then performing a solid phase reaction of Ni0.35Mn0.65(OH)(2) and LiOH. The characterizations from SEM, TEM and XRD show that the prepared material is a two-component composite of Li2MnO3 and LiNi0.5Mn0.5O2 with an average particle size of 300 nm. The charge-discharge tests indicate that the prepared material exhibits high discharge capacity and good cyclic stability. The discharge capacity at 0.1C (where 1C = 263 mA h g(-1)) is 136 mA h g(-1) at the 1st cycle and remains 145 mA h g(-1) at 103th cycle, much better than commercial LiMn2O4.