Li1.07(Ni0.4Mn0.53)1-xAlxO2正极材料的合成与性能
Synthesis and properties of Li1.07（Ni0.4Mn0.53）1-xAlxO2 as cathode materials for lithium ion batteries
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摘要: 采用共沉淀法结合高温固相法制备了Li1.07（Ni0.4Mn0.53）1-xAlxO2正极材料，利用SEM，XRD对所得试样的形貌和晶体结构进行了表征，并研究了材料的电化学性能.研究结果表明，少量Al的掺入会减小材料的颗粒尺寸，降低材料的放电比容量，但可以提高材料的循环稳定性和倍率性能.其中x=0.01时所得试样在25 ℃，2.75～4.2 V，0.5 C倍率下的首次放电比容量为125.1 mAh/g，100次循环后的容量保持率达到99.5%.此外，掺入适量Al后可以降低Li+在材料中的电荷传递阻抗，改善材料的低温放电性能.Abstract: Li1.07（Ni0.4Mn0.53）1-xAlxO2 cathode materials was synthesized by co-precipitation method and high temperature solid-state method. The morphologies and crystal structure of Li1.07（Ni0.4Mn0.53）1-xAlxO2 were characterized by SEM and XRD， respectively. The electrochemi
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