| 摘要 |
This lithium ion secondary battery has at least a cathode, which contains a cathode active material, an anode, which has a material that can store and release lithium ions as the primary component, and an electrolyte, and is characterized in that the cathode active material is a lithium-iron-manganese complex oxide having a layered halite structure and represented by the chemical formula LixFesM1 (z-s)M2 yO2-δ (where in the formula, 1.05 ≤ x ≤ 1.32, 0.06 ≤ s ≤ 0.50, 0.06 ≤ z ≤ 0.50, 0.33 ≤ y ≤ 0.63, 0 ≤δ≤ 0.80, M1 is a metal selected from Co, Ni, and Mn, or a mixture thereof, and M2 is a metal selected from Mn, Ti, and Zr, or a mixture thereof), and the electrolyte contains 1,1,2,3,3,3-hexafluoropropyl difluoromethyl ether, which is a fluorinated ether represented by formula (1). |
