A positive electrode for a lithium ion secondary battery and a lithium ion secondary battery

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PROBLEM TO BE SOLVED : To provide a positive electrode for lithium ion secondary battery having excellent cycle characteristics, storage characteristics, and charge and discharge capacity under a high temperature and high potential environment, and to provide a lithium ion secondary battery.SOLUTION : A positive electrode for lithium ion secondary battery includes a positive electrode active material layer having on its surface a coating layer composed of powder of fluororesin having a structural unit shown by chemical formula (1). An average particle size Dof the powder of fluororesin is 100-300 nm, a thickness of the coating layer is 0.2-1 μm, and a density of the coating layer is 0.78-1.76 g/cm. In the chemical formula (1), R-Rare each independently H, F or Cl, at least one of R-Ris F, and n is an integer of 20 or more.