| xLi2MnO3·(1-x)LiNi1/3Co1/3Mn1/3O2(x=0.1、0.2、0.3和0.4)固溶体材料性能研究 |
| Properties Study of xLi2MnO3·(1-x)LiNi1/3Co1/3Mn1/3O2 (x=0.1, 0.2, 0.3 and 0.4) Solid Solution Materials |
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| 摘要: 通过LiNO3与Mn(NO3)2的混合溶液与LiNi1/3Co1/3Mn1/3O2粉体共混干燥后在900 ℃热处理12 h制备了xLi2MnO3·(1-x)LiNi1/3Co1/3Mn1/3O2(x=0.1、0.2、0.3和0.4)固溶体。随着x的增加，固溶体的XRD峰强度减弱，峰形变宽，而在20°~30°间的结构特征峰(LiMn6)更加明显；尽管固溶体的外观形貌为团聚状，但组成其的单颗粒平均粒径随着x增大，由x=0.1时的250 nm增大到x=0.4时的350 nm。随着充放电截止电压的升高，固溶体的放电比容量增大；在2.5~4.6 V间充放电，当x=0.2时，充放电的极化最小，放电平台最高；不同倍率充放电循环21周后发现随着x的增大，容量保持率从91.2%增加大105.6%。研究结果表明，Li2MnO3可以改善LiNi1/3Co1/3Mn1/3O2材料的电化学性能。 |
| 关键词: 锂离子电池 正极材料 固溶体 xLi2MnO3·(1-x)LiNi1/3Co1/3Mn1/3O2 |
| 基金项目: |
| Abstract: xLi2MnO3·(1-x)LiNi1/3Co1/3Mn1/3O2 (x=0.1, 0.2, 0.3 and 0.4) solid solutions were prepared by annealing the precursors at 900 ℃ for 12 h, which were dried from the mixtures of LiNi1/3Co1/3Mn1/3O2 powder and the solutions of LiNO3 and Mn(NO3)2. The peaks intensity of solid solutions XRD patterns were weak and broaden. The structure peaks (LiMn6) in 20°~30° became more clearly with the x value. The size of single particles increased from 250 nm of x=0.1 to 350 nm of x=0.4 although the appearance of these solid solutions were agglomerate. The capacities of the solid solutions increased with the voltage increasing. The electrode polarization was least and the discharge plateau was highest at x=0.2 from the charge and discharge curves within 2.5~4.6 V. Furthermore, the capacity retention ratios increased from 91.2% to 105.6% with x value after different rate cycling 21 cycles. The results showed that the electrochemical properties of LiNi1/3Co1/3Mn1/3O2 materials can be improved by Li2MnO3. |
| Keywords: lithium ion battery cathode material solid solution xLi2MnO3·(1-x)LiNi1/3Co1/3Mn1/3O2 |
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| 李节宾,徐友龙,董 鑫,薛蓉莉.xLi2MnO3·(1-x)LiNi1/3Co1/3Mn1/3O2(x=0.1、0.2、0.3和0.4)固溶体材料性能研究[J].无机化学学报,2012,28(6):1125-1130. |
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