| 摘要 |
The present invention relates to a nano-positive electrode material of lithium cell and preparation thereof. And the material comprising Lithium iron phosphate as substrate, conductive doping ion and voltage-boosting doping ion, have the general chemical formula: (Li x [M 1-x ])(Fe y [N 1-y ])PO 4 , wherein: x=0.9ˆ¼0.96 ;y=0.93ˆ¼0.97 ; M represents conductive doping ion; N represents voltage-boosting doping ion. The material is prepared by solid phase reaction, of which the process for preparation includes: all raw materials is mixed homogeneously-milled into powder-pellet-formed-isothermally sintered for 2ˆ¼3 hours under 200ˆ¼400°C in inner atmosphere-cooled-milled into powder-pellet-formed-isothermally sintered for 15ˆ¼20 hours under 500ˆ¼780°C in inner atmosphere-cooled-milled into powder-airflow grinded and classified. The method is of low production cost, easy to operate, environment friendly and of high yield. The nano-positive electrode material of lithium cell prepared by the solid phase reaction, wherein the conductivity is higher than 10 -2 S/cm, and the actual discharge capacity > 250mAh/g. And it can be fast charged/discharged in high power. It is provided with the characteristic of low production cost, easy operation method, safety and environment friendly. And it is applicable to small polymer, gel and liquid lithium cell, especially to power cell with high power. |
