The synthesis and electrochemical property of spinel cathode material Li1.05[(Mn1.99Gd0.01)0.91(Mn1.8Co0.2)0.09]O4 for lithium-ion batteries

Abstract

Novel spinel Li1.05[(Mn1.99Gd0.01)0.91(Mn1.8Co0.2)0.09]O4 as cathode material for Li-ion battery was prepared through two-step solid-state reaction and treatment by Li-Mn-Co-O material on the surface of Li1.05[Mn1.99Gd0.01]O4 particles. The physical and electrochemical properties of the materials were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV) and charge-discharge test. The novel material showed improved electrochemical properties compared with the pristine LiMn2O4, especially at elevated temperature. The initial discharge capacity of the Li1.05[(Mn1.99Gd0.01)0.91(Mn1.8Co0.2)0.09]O4 was 128.0 mAh g-1 with a fading rate of 0.041% per cycle at 25°C. Moreover, the cycle ability was improved more evidently at 55°C, the retentions ratio of capacity was up to 91% for the novel material after 100 cycles.