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| Preparation and Investigation on Lattice Distortion and Electrochemical Performances of Li0.95Na0.05FePO4/C |
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Xiao-dong Xin1, Hong-ju Li1, Qin-qin Chang1, Wen-lou Wang*1,2
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1.Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;2.Nano Science and Technology Institute, University of Science and Technology of China, Suzhou 215123, China
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| Abstract: |
| Na+ doped sample Li0.95Na0.05FePO4/C was prepared through solid state method. Structure characterization shows Na+ is successfully introduced into the LiFePO4 matrix. Scanning electron microscopy shows the particle size mainly ranges in 1～3 μm. X-ray diffraction Rietveld refinement demonstrates lattice distortion with an increased cell volume. As one cathode material, it has a discharge capacity of 150 mAh/g at 0.1 C rate. The material exhibits a capacity of 109 and 107 mAh/g at 5 and 7.5 C respectively. When cycled at 1 and 5 C, the material retains 84% (after 1000 cycles) and 86% (after 350 cycles) of the initial discharge capacity respectively indicating excellent structure stability and cycling perfor-mance. Na+doping enhances the electrochemical activity especially the cycle performance effectively. |
| Key words: LiFePO4, Na+-doping, Structure distortion, Cycle performance, Li-ion battery |
| FundProject: |
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| 钠掺杂磷酸铁锂晶格变化和电化学性能 |
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辛晓冬1, 李红举1, 常芹芹1, 王文楼*1,2
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1.中国科学技术大学化学物理系，合肥230029;2.b. 中国科学技术大学纳米科学技术学院，苏州215123
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| 摘要: |
| 利用固相法合成了钠掺杂的LiFePO4，结构表征显示钠离子成功地掺入到了晶格中．SEM显示其粒径在1～3 μm．XRD显示钠掺杂样品晶胞变大．电池测试表明样品0.1 C放电150 mAh/g，5和7.5 C下分别放电109和107 mAh/g．1和5 C循环时，与初始放电容量相比，样品容量保持率分别为84%(1000次循环后)和86%(350次循环后)，表现了优异的结构稳定性和循环性能．研究表明钠离子掺杂可以有效地提高磷酸铁锂的电化学活性，尤其是循环性能． |
| 关键词: 磷酸铁锂，钠离子掺杂，结构变化，循环性能，锂离子电池 |
| DOI：10.1088/1674-0068/25/04/429-433 |
| 分类号: |