Highly graphitized carbon is the most widely utilized anode material for Li
-ion secondary batteries because of its high reversibility and reliability.
However, it has so far been believed that well graphitized carbon material
gives no stable Li charge/discharge performance in a pure propylene carbon
ate (PC)-based electrolyte, since PC decomposes vigorously at the surface o
f the graphite during the charging process. Surprisingly, we found that a s
ingle graphitized carbon fiber revealed a sufficiently stable performance i
n pure PC containing 1 M LiClO4.
The initial irreversible charging capacity not only in PC but in an EC-base
d electrolyte was found strongly dependent on the conductivity homogeneity
of the electrode. (C) 2001 Published by Elsevier Science B.V.