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Preparation and Investigation on Lattice Distortion and Electrochemical Performances of Li0.95Na0.05FePO4/C
Xiao-dong Xin,Hong-ju Li,Qin-qin Chang,Wen-lou Wang*
Author NameAffiliationE-mail
Xiao-dong Xin Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Hong-ju Li Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Qin-qin Chang Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Wen-lou Wang* Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, ChinaNano Science and Technology Institute, University of Science and Technology of China, Suzhou 215123, China wlwang@ustc.edu.cn 
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:
钠掺杂磷酸铁锂晶格变化和电化学性能
辛晓冬,李红举,常芹芹,王文楼*
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: