| abstract |
PROBLEM TO BE SOLVED: To provide a lithium secondary battery excellent in safety, high temperature storage characteristics, and electrochemical characteristics. The present invention relates to a lithium secondary battery excellent in safety and high-temperature storage characteristics. The lithium secondary battery includes a positive electrode and a negative electrode capable of reversible insertion / extraction of lithium, and an electrolyte. , At least one of the positive electrode or the negative electrode includes an active material, a water-soluble polymer binder, and a water-soluble thickener, and the electrolyte is a cyclic carbonate and alkyl, alkenyl, alkynyl, aryl, or a combination thereof. A non-aqueous organic solvent containing a lactone compound having a substituent selected from the group consisting of, and a lithium salt. [Selection] Figure 2 |