| 引用本文: | 伊廷锋,朱彦荣,沈浩宇,马永泉,左朋建,诸荣孙.Mn2+掺杂对LiFePO4正极材料结构、性能及嵌锂动力学的影响[J].哈尔滨工业大学学报,2013,45(7):121.DOI:10.11918/j.issn.0367-6234.2013.07.022 |
| YI Tingfeng,ZHU Yanrong,SHEN Haoyu,MA Yongquan,ZUO Pengjian,ZHU Rongsun.Effects of Mn2+ doping on structure, performance and kinetic of lithium-ion insertion of LiFePO4 positive-electrode material[J].Journal of Harbin Institute of Technology,2013,45(7):121.DOI:10.11918/j.issn.0367-6234.2013.07.022 |
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| Mn2+掺杂对LiFePO4正极材料结构、性能及嵌锂动力学的影响 |
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伊廷锋1,2,3, 朱彦荣1, 沈浩宇2,3, 马永泉3, 左朋建2, 诸荣孙1
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(1. 安徽工业大学 化学与化工学院,243002 安徽 马鞍山;2. 哈尔滨工业大学 化工学院, 150001 哈尔滨;3. 超威电源有限公司,313100 浙江 湖州)
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| 摘要: |
| 为了改善橄榄石型LiFePO4正极材料的性能,采用高温固相法合成了Mn掺杂的LiMnxFe1-xPO4(x=0,0.0,0.5,0.0,0.50)材料．采用X射线粉末衍射、扫描电子显微镜、充放电测试、循环伏安和电化学阻抗谱研究了材料的结构、电化学性能和锂离子嵌脱动力学．结果表明,锰掺杂的LiFePO4样品颗粒分布比较均匀,具有较小的平均粒径和窄的粒度分布,LiMnxFe1-xPO4是纯相的橄榄石结构．在不同倍率下,LiMn0.4Fe0.6PO4具有最高的放电容量和最好的动力学性能．Mn的掺杂提高了LiFePO4材料的可逆性、锂离子扩散系数和放电容量,减小了电荷转移电阻,进而提高了其动力学性能． |
| 关键词: 锂离子电池 正极材料 LiMnxFe1-xPO4 动力学性能 |
| DOI：10.11918/j.issn.0367-6234.2013.07.022 |
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| 基金项目:国家自然科学基金资助项目(2,1);中国博士后科学基金资助项目(2012M520749);浙江省博士后科研择优资助项目(Bsh1201013);安徽工业大学“绿色能源材料化学基础研究与应用开发”创新团队资助项目(TD201202). |
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| Effects of Mn2+ doping on structure, performance and kinetic of lithium-ion insertion of LiFePO4 positive-electrode material |
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YI Tingfeng1,2,3, ZHU Yanrong1, SHEN Haoyu2,3, MA Yongquan2,3, ZUO Pengjian2, ZHU Rongsun1
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(1. School of Chemistry and Chemical Engineering, Anhui University of Technology, 243002 Maanshan, Anhui, China; 2. School of Chemical Engineering, Harbin Institute of Technology, 150001 Harbin, China; 3. Chilwee Power Co., Ltd, 313100 Huzhou, Zhejiang, China)
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| Abstract: |
| To improve the performance of olivine LiFePO4 positive-electrode material, the Mn-doped LiMnxFe1-xPO4(x=0,0.0,0.5,0.0,0.50) materials were prepared by a solid-state reaction method. The structure, electrochemical performance and lithium ion insertion-extraction kinetic of the material are investigated by scanning electron microscopy (SEM), X-ray diffractometry (XRD), charge-discharge tests, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results show that the Mn-doped LiFePO4 material powders have a uniform morphology, a small particle size and narrow particle size distribution, and LiMnxFe1-xPO4 materials are pure phase olivine structure. LiMn0.4Fe0.6PO4 shows the highest discharge capacity and the best kinetic performance among all samples at different rates. The Mn doping improves the reversibility, Li+ions diffusion coefficient and discharge capacity, and reduces the charge transfer resistance, and then increase the kinetic performance of LiFePO4 material. |
| Key words: lithium ion battery positive-electrode material LiMnxFe1-xPO4 kinetic performance
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