Lithium intercalation behavior of surface modified carbonaceous materials

摘要

The surface properties of several well-characterized commercial carbon materials were modified by thermal and chemical treatments. The reversible capacities for lithium intercalation of a sponge green coke and a fuel green coke for lithium intercalation increased by as much as 25% after heat treatment in both reducing (5% H2/Ar) and oxidizing (CO2) environments. The irreversible capacity loss increased significantly with CO2 treatment at 800 deg C. The trend of larger capacity losses with CO2 treatment is also observed with a synthetic graphite (SFG6) which was produced by heat treatment at about 3000 deg C. Carbon fibers that were first impregnated with LiOH solution followed by reaction with CO2 to form Li2CO3 tended to show lower irreversible capacity losses.