罗学英,李燕,郭俊明,向明武,苏长伟,刘晓芳,白红丽,段开娇

• 1:云南民族大学生物基材料绿色制备技术国家地方联合工程研究中心
• 2:云南民族大学云南省高校绿色化学材料重点实验室

摘要(Abstract)：

采用熔盐燃烧法制备Ni和Cr共掺杂尖晶石LiNi_(0.01)Cr_xMn_(1.99-x)O_4(掺杂Cr的量x≤0.07)正极材料,以改善锂离子电池正极材料的电化学性能。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)等对其晶体结构、微观形貌和物相组成进行表征,并利用恒电流充放电测试、循环伏安(CV)和电化学阻抗谱(EIS)对电化学性能进行研究。结果表明,样品均为单相尖晶石LiMn_2O_4结构,颗粒尺寸在50～100 nm。x=0.05样品具有高的Li~+扩散系数和低的电荷转移电阻,表现出优良的动力学性能和电化学性能。在1 C,x=0.05样品首次放电比容量为114.3m A×h×g~(-1),循环500次后的容量保持率为74.8%,即使在20和30 C的较高倍率,经过1 000次长循环后,仍分别保持51.9%和43.1%的容量保持率。适量的Ni-Cr共掺杂提高了LiMn2O4的晶体结构稳定性,改善了电化学性能。

关键词(KeyWords)： 熔盐燃烧法;Ni-Cr共掺杂;LiMn_2O_4;正极材料;锂离子电池

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51462036,U1602273,51972282)

作者(Author): 罗学英,李燕,郭俊明,向明武,苏长伟,刘晓芳,白红丽,段开娇

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