【摘要】 采用高温固相反应法制备了高电压尖晶石材料LiNi_0.5Mn_1.5O₄（LNMO）。采用XRD、Raman、SEM、首次充放电曲线、CV曲线、EIS阻抗谱等测试分析手段研究了球磨时间对材料结构和性能的影响。结果表明,所有样品均具有相似的晶格结构;所有样品均为无序型空间结构;当球磨时间为4h时,材料颗粒尺寸较均匀。首次充放电曲线和CV曲线结果表明,球磨时间并没有改变的材料的反应机制。球磨时间4h时,材料表现出最优异的电化学性能,主要包括高容量（0.1C比容量115.8mAh/g）,高倍率（10C放电比容量76.2mAh/g）和高循环稳定性（0.1C、100次循环后容量保持率为94.7%）。更多还原

【Abstract】 High voltage spinel cathode LiNi_0.5Mn_1.5O₄（LNMO）was prepared via solid state method,the effect of ball-milling time on crystal structure,space group was characterized by XRD,Raman,SEM;electrochemical properties of LiNi_0.5Mn_1.5O₄ were investigated by cyclic voltammetry（CV）,rate capability,cycle stability and initial charge-discharge curve.XRD results show all samples exhibit similar XRD patterns,Raman results show that all samples are disorder space group.The optimized ball-milling time is 4h,as demonstrated by even particles and superior electrochemical properties including high capacity（the discharge capacity of LNMO is 115.8mAh/g under0.1C）,high-rate capability（the discharge capacity of LNMO is 76.2mAh/g under 10C）and high cycle stability（the capacity retention of LNMO is 94.7%after 100cycles under 0.1C）.CV and initial charge-discharge curves prove that ball-milling time does not change the reaction process of LNMO.更多还原