LITHIUM-ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a lithium-ion secondary battery excellent in charge/discharge cycle life and reliability in a large current and suitable for a use in repeating charge and discharge in a large current such as electric driven tool.

SOLUTION: The lithium-ion secondary battery is composed of an anode active material containing a carbon material having 0.2 or more and 0.8 or less of an R value of Raman spectrum when excited by argon laser of wavelength 514.5 nm and 0.34 nm or less of a face distance d002of the 002 face with a ratio of the carbon material in the anode active material being 60 mass% or more and with a density of an anode mixture layer being 1.4 to 1.65g/cm3, and a separator made of a lamination body containing a porous layer containing resin with a melting point of 120 to 140°C and a porous layer containing resin with a melting point of 150°C or higher or a porous layer mainly composed of inorganic particles of a heat resisting temperature 150°C or higher.

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