Abstract: LiMn_1.925Cu_0.075O₄ cathode material was prepared by microwave induced solution flameless combustion method. The X-ray diffraction (XRD), the scanning electron microscopy (SEM), the X-ray photoelectron spectroscopy (XPS) test showed that the crystal structure of LiMn₂O₄ was not changed with the doping of Cu; the roasting time prolonging, the particule size increases gradually, and the grain boundary becomed clear, Cu²⁺ was successfully doped into LiMn₂O₄. The electrochemical tests showed that the cathode material of LiMn_1.925Cu_0.075O₄ exhibits an outstanding electrochemical performance at the second calcination time of 8 h. It delivered first discharge specific capacity of 110.9 mA·h·g⁻¹ and a capacity retention rate of 63.9% after 400 cycles at 1 C; at high current rate of 5 C and 10 C, a long life of 1000 cycles could be achieved, and it showed the first-discharge specific capacity of 108.9, 94.8 mA·h·g⁻¹ and a retention rate of 61.3%, 68.1%, respectively. The Cu doping could restrain effectively the Jahn-Teller effect and alleviate Mn dissolution, and hence improved the electrochemical performance and structural stability of the material.