PREPARTION AND CHARACTERIZATION OF HIGH-POWER ANODE MATERIALS USING SOFT CARBON PRECURSORS FOR LITHIUM ION SECONDARY BATTERY

摘要

In order to improve the power capability of Li-ion secondary battery, various coke samples, which were prepared by milling, pitch coating, and heat treatment, were studied as the anode materials. As the coal tar pitch coated cokes were heat treated in the range of 1000-1300°C, the reversible capacities showed moderate values around 200～240 mAh/g but the initial charge-discharge efficiencies and power capabilities were improved significantly. The petroleum pitch/S-coke composites at 1:4 and 1:3 weight ratio presented the highest reversible capacities and their initial charge-discharge efficiencies and power capabilities were higher than those of CCP-C10 cokes heat treated at 1000°C.