Effect of Hydrothermal Temperature on Structure and Electrochemical Performances of LiNi0.5Mn1.5O4 Cathode Material for Lithium-ion Battery

摘要

High voltage spinel LiNi0.5Mn1.5O4 cathode material was synthesized via a facile hydrothermal method using urea as precipitant agent combined with a high-temperature calcination process. The effect of hydrothermal temperature on structural and electrochemical properties of LiNi0.5Mn1.5O4 cathode material was systematically investigated. The as-prepared samples were characterized by XRD, FT-IR, SEM, EIS and galvanostatic charge/discharge test. The results show that the LiNi0.5Mn1.5O4 cathode material prepared by the Ni0.25Mn0.75CO3 precursor hydrothermally synthesized at 190 degrees C shows the optimal rate capability, whose discharge capacity at 10 C rate could reach 115.1 mA h g(-1), corresponding to 95.1 % of the capacity at 0.2 C rate. The LiNi0.5Mn1.5O4 cathode material prepared by the precursor hydrothermally synthesized at 200 degrees C shows the optimal cycling performance, whose capacity retention rate after 100 cycles at 1C rate could reach 96.9 %.