【摘要】 采用微波诱导液相无焰燃烧法快速制备LiMn_1.925Cu_0.075O₄正极材料.通过X射线衍射分析（XRD）、扫描电子显微镜（SEM）、X射线光电子能谱（XPS）测试手段表明，Cu掺杂未改变尖晶石LiMn₂O₄的晶体结构；随着焙烧时间的延长，颗粒尺寸逐渐增大，晶界逐步清晰；Cu²⁺进入LiMn₂O₄晶格中.电化学测试表明，二次焙烧8 h的LiMn_1.925Cu_0.075O₄正极材料表现出优异的电化学性能.在1 C倍率下，首次放电比容量为110.9mA·h·g^-1，循环400次后容量保持率63.9%；在5 C和10 C高倍率下可实现1 000次循环，首次放电比容量分别为108.9、94.8 mA·h·g-1，保持率分别为61.3%、68.1%. Cu掺杂有效抑制Mn的溶解和Jahn-Teller效应，提高材料的结构稳定性与电化学性能.更多还原

【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 400cycles at 1 C; at high current rate of 5 C and 10 C, a long life of 1 000 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.更多还原