CATHODE COMPOSITE MATERIAL WITH IMPROVED ELECTRODE EFFICIENCY AND ENERGY DENSITY CHARACTERISTICS

摘要

The present invention relates to a cathode composite material containing a cathode active substance with the composition of the chemical formula (1) LiFe (P 1-x O4), and provides a cathode composite material wherein the mole ratio (1-x) of phosphorus (P) ranges from 0.910 to 0.999 in the chemical formula (1) so that the operating efficiency of said cathode active substance may be subject to leveling to the level of the anode active substance with a relatively low operating efficiency. Such cathode composite material maximizes the efficiency of the electrode active substance and minimizes material waste so that manufacturing cost may be reduced. Furthermore, an anode active substance the mole ratio (1-x) of phosphorus (P) whereof has been adjusted to less than 1 according to the present invention is advantageous in that Fe 2+ and Fe 3+ co-exist, so that structure decay caused by deficiency of phosphorus (P) does not take place, and ionic conductivity is improved so that its rate characteristics are excellent, IR drop phenomena is suppressed during charging and discharging, and a high energy density is provided.