US 2008/0176140 A1 · BATTERY

Abstract

A battery includes a spirally wound electrode body in which a cathode and an anode are layered with a separator in between and spirally wound. The spirally wound electrode body is attached with at least one lead on the spirally-winding center side. The cathode has a cathode current collector having a pair of opposed faces, an outer-face cathode active material layer provided on the spirally-winding outer face side of the cathode current collector, and an inner-face cathode active material layer provided on the spirally-winding inner face side thereof. A thickness of the inner-face cathode active material layer is smaller than a thickness of the outer-face cathode active material layer. An outer face active material region provided with only the outer-face cathode active material layer is formed to be overlapped with the lead on the spirally-winding center side of the cathode.

Claims8

Dependent claims

A battery comprising a spirally wound electrode body in which a cathode and an anode are layered with a separator in between and spirally wound,

wherein the spirally wound electrode body is attached with at least one lead on the spirally-winding center side,
the cathode has a cathode current collector having a pair of opposed faces, an outer-face cathode active material layer provided on the spirally-winding outer face side of the cathode current collector, and an inner-face cathode active material layer provided on the spirally-winding inner face side thereof,
a thickness of the inner-face cathode active material layer is smaller than a thickness of the outer-face cathode active material layer, and
an outer face active material region provided with only the outer-face cathode active material layer is formed to be overlapped with the lead on the spirally-winding center side of the cathode.

1 more element

Dependencies are inferred from the claim text.

Battery

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Battery

Life of this patent

Abstract

Claims8