Pure olive-type phased LiFePO4 powders were successfully synthesized b y hydrothermal processes. The samples were investigated by X-ray diffraction, sc anning electron microscopy and so on. Results showed that hydroth...Pure olive-type phased LiFePO4 powders were successfully synthesized b y hydrothermal processes. The samples were investigated by X-ray diffraction, sc anning electron microscopy and so on. Results showed that hydrothermal product w ere of pure olive-type phase with a relatively smaller particle size and regular er morphology compared with the products prepared by solid-state reaction and ba ll milling activation approaches. Charge/discharge curves at 0.5 C rate revealed that the hydrothermal products had a first discharge capacity of 124 mAh·g-1, and the capacity fading rate was only 10.7% after 50 cycles.展开更多
Nanocrystalline Trimanganese tetroxide (Mn3O4) was synthesized by solvothermal reaction of MnO2 and C2H5OH. The dependence of the Mn3O4 nanoparticle size on synthesis temperature was investigated using X-ray diffracti...Nanocrystalline Trimanganese tetroxide (Mn3O4) was synthesized by solvothermal reaction of MnO2 and C2H5OH. The dependence of the Mn3O4 nanoparticle size on synthesis temperature was investigated using X-ray diffraction (XRD) technique. The mechanism for the nanocrystallite growth was also studied. The results indicate that the prepared Mn3O4 has a nanocrystalline structure with XRD average crystal size varing from 54 to 70 nm depending on the synthesis temperature. The activation energy for the nanocrystallite growth was calculated to be 11.36 kJ·mol-1 according to the kinetic theory of nanocrystallite growth, indicating that Mn3O4 nanocrystallite grows primarily by means of an interfacial reaction during the solvothermal process.展开更多
文摘Pure olive-type phased LiFePO4 powders were successfully synthesized b y hydrothermal processes. The samples were investigated by X-ray diffraction, sc anning electron microscopy and so on. Results showed that hydrothermal product w ere of pure olive-type phase with a relatively smaller particle size and regular er morphology compared with the products prepared by solid-state reaction and ba ll milling activation approaches. Charge/discharge curves at 0.5 C rate revealed that the hydrothermal products had a first discharge capacity of 124 mAh·g-1, and the capacity fading rate was only 10.7% after 50 cycles.
文摘Nanocrystalline Trimanganese tetroxide (Mn3O4) was synthesized by solvothermal reaction of MnO2 and C2H5OH. The dependence of the Mn3O4 nanoparticle size on synthesis temperature was investigated using X-ray diffraction (XRD) technique. The mechanism for the nanocrystallite growth was also studied. The results indicate that the prepared Mn3O4 has a nanocrystalline structure with XRD average crystal size varing from 54 to 70 nm depending on the synthesis temperature. The activation energy for the nanocrystallite growth was calculated to be 11.36 kJ·mol-1 according to the kinetic theory of nanocrystallite growth, indicating that Mn3O4 nanocrystallite grows primarily by means of an interfacial reaction during the solvothermal process.
