锂离子正极材料LiCo1-xMgxMnO4与LiCo1-xAlxMnO4 (x = 0, 0.02, 0.05, 0.1)的制备及其电化学性能 |
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引用本文: | 游美玲,童庆松,李秀华,林忞,黄行康,杨勇. 锂离子正极材料LiCo1-xMgxMnO4与LiCo1-xAlxMnO4 (x = 0, 0.02, 0.05, 0.1)的制备及其电化学性能[J]. 电化学, 2014, 20(1): 22. DOI: 10.13208/j.electrochem.121122 |
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作者姓名: | 游美玲 童庆松 李秀华 林忞 黄行康 杨勇 |
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作者单位: | 1. 福建师范大学化学系,福建 福州 350007;2. 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: | 福建省教育厅科技项目(A类,No.JA10072);福建省高校杰出青年科研人才计划项目(No.JA11040);福建省自然科学基金计划项目(No.2011J05021)资助 |
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摘 要: | 采用固相法合成掺杂镁和铝尖晶石LiCoMnO4材料,研究镁和铝掺杂量对尖晶石LiCoMnO4电极的初始容量、放电平台以及循环性能的影响. 利用扫描电子显微镜、粉末X-射线衍射仪观察分析材料形貌及结构. 结果表明,所合成材料的粒径分布均匀,结晶性较佳. LiCoMnO4电极初始容量为87.0 mAh.g-1,少量镁或铝掺杂使电极初始容量有所增加,LiCo0.98Mg0.02MnO4和LiCo0.98Al0.02MnO4电极初始容量分别为91.3和93.6 mAh.g-1,提高了其5 V放电平台的比例,过量掺杂则其容量降低. 此外,掺杂Al显著改善了LiCoMnO4电极的循环性能,而掺杂镁对电极的循环性能其影响不明显.
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关 键 词: | 固相合成 尖晶石LiCoMnO4 镁掺杂 铝掺杂 锂离子电池 正极材料 |
收稿时间: | 2012-11-22 |
Synthesis and Electrochemical Properties of LiCo1-xMgxMnO4 and LiCo1-xAlxMnO4 (x= 0, 0.02, 0.05, 0.1) as Positive Materials for Lithium-ion Batteries |
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Abstract: | The Al-doped and Mg-doped LiCoMnO4 materials were synthesized through solid-state reaction. The effects of doping amounts of Mg and Al on the initial capacities, discharge plateaus, and cycle performances were investigated. The morphologies and structures of the as-prepared materials were studied by scanning electron microscopy and powder X-ray diffraction. The results indicate that the as-prepared samples were composed of uniform, well-crystallized particles. The pristine LiCoMnO4 possessed an initial capacity of 87.0 mAh·g-1, while LiCo0.98Mg0.02MnO4 and LiCo0.98Al0.02MnO4 delivered 91.3 and 93.6 mAh·g-1, respectively. The proper doping amount increased the capacity and the ratio of discharge plateau at 5 V, while over-doping decreased the discharge capacity of LiCoMnO4. In addition, Al doping significantly improved the cycle performance of LiCoMnO4, while no apparent influence with Mg doping. |
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Keywords: | solid state reaction spinel LiCoMnO4 Mg-doped Al-doped lithium-ion battery cathode material |
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