高首效富镍正极材料LiNi0.6Co0.2Mn0.2O2的合成及电化学性能研究 |
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引用本文: | 关小云,洪朝钰,朱建平,王伟立,李益孝,杨勇. 高首效富镍正极材料LiNi0.6Co0.2Mn0.2O2的合成及电化学性能研究[J]. 电化学, 2018, 24(1): 56. DOI: 10.13208/j.electrochem.170317 |
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作者姓名: | 关小云 洪朝钰 朱建平 王伟立 李益孝 杨勇 |
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作者单位: | 厦门大学固体表面物理化学国家重点实验室,化学化工学院化学系,福建 厦门 361005 |
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基金项目: | 国家自然科学基金项目(No. 21233004,No. 21428303)资助 |
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摘 要: | 采用共沉淀-高温固相烧结的方法合成了富镍正极材料LiNi0.6Co0.2Mn0.2O2(简称NCM622),通过X射线粉末衍射(XRD)/Rietveld精修法、扫描电子显微镜(SEM)及电化学测试,对不同温度下合成材料的结构、形貌、电化学性能进行表征. 结果表明,800℃下,NCM622阳离子混排程度最低(~1.97%),首圈库伦效率高达92.2%,100圈容量保持率为81.4%.
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关 键 词: | 锂离子电池 正极材料 LiNi0.6Co0.2Mn0.2O2 首周库仑效率 |
收稿时间: | 2017-03-17 |
Synthesis and Electrochemical Properties of Nickel-Rich Cathode Material LiNi0.6Co0.2Mn0.2O2 with High Initial Coulombic Efficiency |
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Abstract: | Nickel-rich cathode materialsLiNi0.6Co0.2Mn0.2O2(NCM622)were synthesized by a co-precipitation-solid state sintering method at different temperatures. The structure, morphology and electrochemical performance of the as-prepared materials were investigated by X-ray powder diffraction (XRD) /Rietveld refinement, scanning electron microscope (SEM) and electrochemical experiments. It is found that NCM622 calcined at 800 ℃ showed the lowest degree of cation disorder (~1.97%) with a high initial Coulombic effiency of 92.2% and the capacity retentionof 81.4% after 100 cycles. |
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Keywords: | lithium-ion battery,cathode material LiNi0.6Co0.2Mn0.2O2,initial Coulombic efficiency, |
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