| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery capable of restraining a short circuit between cathode and anode from occurring due to deposition of metal on an anode active material layer under high temperature, and a method for manufacturing the same.SOLUTION: A battery 1 comprises an electrode body 10 formed by winding a cathode plate 30 and an anode plate 40 via separators 20X, 20Y, and an electrolyte 50. The anode plate has an outer circumferential anode part 40S and an inner circumferential anode part 40T, while an anode foil 48 and two anode active material layers 41's form a common other-side end face 40P at an edge on an other side DX2 in the axial direction. The separators have interposing portions 22XT, 22XU, 22YS, 22YU interposed between a cathode active material layer 31 and opposed portions 42, 42SH, 42TH of the anode active material layers opposed thereto, and liquid retention reducing portions 26XS, 26XT, 26YS, 26YT whose electrolyte retention capability is reduced than that of the interposing portions. At least either an outer circumferential end face 40SP or an inner circumferential end face 40TP out of the other-side end face of the anode plate is covered with the liquid retention reducing portions. |
