LiNi0.5Mn1.5O4/Li4Ti5O12电池体系的性能研究

采用高温固相法合成了锂离子电池用正极材料LiNi0.5Mn1.5O4和负极材料Li4Ti5O12。通过XRD和SEM分析,并借恒电流充放电和循环伏安法测试了LiNi0.5Mn1.5O4/Li4Ti5O12电池体系的电化学性能。结果表明:LiNi0.5Mn1.5O4和Li4Ti5O12均为尖晶石结构,LiNi0.5Mn1.5O4/Li4Ti5O12电池具有良好的充放电循环可逆性,以0.5C倍率充放电,首次放电比容量可达124.31mAh·g–1,充放电循环50次后,放电比容量在116mAh·g–1以上,容量保持率为93.32%。

Study on the properties of the battery-system LiNi0.5Mn1.5O4/Li4Ti5O12

The cathode material LiNi0.5Mn1.5O4 and anode material Li4Ti5O12 for lithium-ion batteries were prepared by the solid-state method. The materials were characterized by XRD and SEM. The electrochemical performances of the battery-system LiNi0.5Mn1.5O4/Li4Ti5O12 were tested by constant-current cyclic testing and cyclic voltammetry. The results show that the all of LiNi0.5Mn1.5O4 and Li4Ti5O12 exhibit simple spinel phase. The battery-system LiNi0.5Mn1.5O4/Li4Ti5O12 has improved charge-discharge capacity and good cyclability. Under the condition of 0.5 C, charge and discharge is carried out, the first discharge capacity is 124.31 mAh·g–1, after 50 cycles, the discharge capacity is still above 116 mA·g–1 and the capacity retention is 93.32 %.