COMPOSITE LiFe0.95V0.05PO4/C AS THE ELECTRODE MATERIAL FOR SECONDARY LITHIUM ION BATTERIES WITH AQUEOUS ELECTROLYTIC SOLUTION

摘要

Invention herewith described refers to the composite LiFe0.95V0.05PO4/C as the electrode material for the secondary lithium ion batteries with the aqueous electrolytic solution. There is found the synthesis procedure of the new composite material composed of LiFe0.95V0.05PO4/C containing the olivine, LiFePO4, and doped with vanadium and its particles finely coated with carbon. Further on it is shown that this material when used as the cathode material of the lithium ion battery in the lithium nitrate aqueous solution, allows rapid galvanostatic charge and discharge with a very good maintenance of the coulomb capacity after a large number of cycles. Namely, the initial discharge capacity at the 1C rate was 91 mAh/g and after 50 cycles it was 83 mAh/g. At 2C, ZS, 5C, 10C, 20C, 40C, 50C and 100C rates, the medium capacity was 79 mAh g-1, 71 mAh g-1, 69 mAh g-1, 67 mAh g-1, 50 mAh g-1, 45 mAh g-1, 42 mAh g-1 and 32 mAh g-1, respectively