LITHIUM ION SECONDARY CELL AND ITS CATHODE

摘要

The present invention relates to a lithium ion secondary battery using as the negative active material thereof a carbon material that enables the absorption and release of lithium ions and has volume resistivity not exceeding 5.0 X 10<-3>ohm.cm, thereby preventing battery temperatures from increasing abruptly due to low volume resistivity of the carbon material even when short-circuiting takes place inside of the battery. <IMAGE>