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|Title:||Enhanced electrochemical properties of LiFePO₄ by Mo-substitution and graphitic carbon-coating via a facile and fast microwave-assisted solid-state reaction|
|Other Titles:||Enhanced electrochemical properties of LiFePO(4) by Mo-substitution and graphitic carbon-coating via a facile and fast microwave-assisted solid-state reaction|
|Citation:||Physical Chemistry Chemical Physics, 2012; 14(10):3634-3639|
|Publisher:||Royal Society of Chemistry|
|Dan Li, Yudai Huang, Neeraj Sharma, Zhixin Chen, Dianzeng Jia and Zaiping Guo|
|Abstract:||A composite cathode material for lithium ion battery applications, Mo-doped LiFePO(4)/C, is obtained through a facile and fast microwave-assisted synthesis method. Rietveld analysis of LiFePO(4)-based structural models using synchrotron X-ray diffraction data shows that Mo-ions substitute onto the Fe sites and displace Fe-ions to the Li sites. Supervalent Mo(6+) doping can act to introduce Li ion vacancies due to the charge compensation effect and therefore facilitate lithium ion diffusion during charging/discharging. Transmission electron microscope images demonstrate that the pure and doped LiFePO(4) nanoparticles were uniformly covered by an approximately 5 nm thin layer of graphitic carbon. Amorphous carbon on the graphitic carbon-coated pure and doped LiFePO(4) particles forms a three-dimensional (3D) conductive carbon network, effectively improving the conductivity of these materials. The combined effects of Mo-doping and the 3D carbon network dramatically enhance the electrochemical performance of these LiFePO(4) cathodes. In particular, Mo-doped LiFePO(4)/C delivers a reversible capacity of 162 mA h g(-1) at a current of 0.5 C and shows enhanced capacity retention compared to that of undoped LiFePO(4)/C. Moreover, the electrode exhibits excellent rate capability, with an associated high discharge capacity and good electrochemical reversibility.|
|Keywords:||Phosphates; Carbon; Lithium; Iron; Molybdenum; Electrochemistry; Microwaves; Electric Power Supplies|
|Rights:||This journal is © the Owner Societies 2012|
|Appears in Collections:||Chemistry and Physics publications|
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