Heat resistant lithium battery

A heat resistant lithium battery is provided for enhancing a long-term reliability without sacrificing the electrochemical features such as the safeness of the heat resistance or the discharge characteristics even under a severely high temperature environment, wherein within the lithium battery that has a cathode, an anode, a separator interposed between the cathode and the anode and a nonaqueous electrolyte comprising nonaqueous solvent and electrolyte salt, the nonaqueous solvent comprises at least one solvent with its boiling point over 200DEG C among the compound represented by the general formula (1) and at least one solvent with its boiling point below 200 DEG C among the compound represented by the general formula (1), and a grand total volume ratio of the compound represented by the general formula (1) within the nonaqueous solvent at 23 DEG C is between 95% and 100%. X-(O-C2H4)N-O-Y (1) (wherein X, Y are independent alkyl groups (C1-4), and n is 1-5.)