esented by R1, R2, R3 and R4 is an alkyl group having 1 or 2 carbon atoms. [0049] (23) The lithium secondary battery of (21) wherein the material of which the negative electrode is made comprises a carboxyl or hydroxyl group-bearing compound as a portion thereof, and said lithium ion conductive material contains propylene carbonate. [0050] (24) The lithium secondary battery of (21) wherein a posit