کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
217833 | 463170 | 2016 | 6 صفحه PDF | دانلود رایگان |

• Rhombohedron-like LiFePO4 platelets exposed on (010) plane are synthesized.
• LiFePO4 with preferential (010) plane exhibits enhanced electrochemical performances.
• Mechanism of the PEG-induced growth of LiFePO4 platelets is revealed.
Rhombohedron-like LiFePO4 platelets with preferentially exposed (010) plane are synthesized via solvothermal reaction using 30 vol.% Polyethylene glycol (PEG) solution as solvent. The mechanism of the PEG-induced crystal growth of the LiFePO4 platelets under solvothermal circumstance is revealed. The crystal structure, micro morphology and electrochemical performance of the prepared LiFePO4 platelets are studied by means of X-Ray diffraction (XRD), scanning electron microscope (SEM), high-resolution transmission electron microscopy (HRTEM), electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge test. Due to the preferential growth of (010) lattice plane facilitating diffusion of Li-ions, the LiFePO4 material shows excellent electrochemical performance. The as-obtained products deliver initial discharge capacities of 166.8 mAh g− 1 with an initial Coulombic efficiency of 99.4% at 0.1C, discharge capacities of 144.7 mAh g− 1 at 1C and discharge capacities of 116.5 mAh g− 1 at 5C. Moreover, the discharge capacities after 262 cycles at 1C are 142.4 mAh g− 1 (capacity retention is 98.4%). This solvothermal reaction approach is a promising strategy for the commercialization of LiFePO4 cathode in lithium ion batteries.
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Journal: Journal of Electroanalytical Chemistry - Volume 775, 15 August 2016, Pages 110–115