| 초록 |
Lithium iron phosphate (LiFePO4) has been identified as an interesting cathode material for lithium-ion batteries. This material has many advantages of inexpensive, non-toxic and thermally stable in the fully-charged state. In addition, LiFePO4 has a large theoretical capacity of 170 mAh/g and good cycle stability. However, LiFePO4 has poor rate capacity, which is attributed to low electronic conductivity (~10-9 Scm-1) and/or slow diffusion rate of lithium ions across the two phase boundary. Recent research has suggested that this limitation of conductivity can be overcome by adding a conductive material on synthesizing the LiFePO4 powder. Spray pyrolysis was applied to the preparation of carbon-included LiFePO4 powders. In this study, the morphologies and electrochemical performances of LiFePO4 cathode powders prepared by spray pyrolysis from aqueous and colloidal spray solutions. The precursor powders obtained by spray pyrolysis from the colloidal spray solution containing nano-sized carbon black had spherical shapes, micron sizes, and filled morphologies. Carbon-mixed LiFePO4 cathode powders improved the charge/discharge capacities and cycle performances. |
