Anodic performances of unconventional non-graphitic carbons

The performances of two unconventional non-graphitic carbon materials as an anode for lithium ion battery were examined to correlate to their structur e. Fullerene soot after extracted fullerene and pyrolytic product of ethyle ne dichloride both heat-treated at 2400 degrees C, carried relatively thick turbostratic layers of small hexagonal planes to form periphery of hollow spheres. Such structural characteristics provided the charge / discharge ch aracteristics such as very lower discharge capacity, lower Coulombic effici ency and short plateau around 1.0V at the discharge, which are very close t o those of carbons hear-treated around 1000-1400 degrees C. Mechanisms of l ithium insertion into non-graphitic carbons is discussed in relation to the ir graphitic structure to explain no formation of C6Li intercalation to the turbostratic stacking of small carbon planes, very high reactivity to of c arbon edge highly reduced lithium ion, poor Coulombic efficiency and cyclea bility. No charge in the hollow eliminates the characteristic charge / disc harge profile of some hard carbons calcined at 1000-1400 degrees C.