Importance

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Abstract

A power storage device includes an electrolytic solution, which includes ethylene carbonate, another solvent having a lower melting point than that of ethylene carbonate, and a supporting electrolyte containing P, a strip-shaped positive electrode plate, a strip-shaped negative electrode plate including a strip-shaped negative active material layer in which an SEI film is formed, and a strip-shaped separator. The power storage device further includes a wound electrode body in which the electrolytic solution is impregnated inside. The negative active material layer of the electrode body has a width of 180 mm or larger. A P amount contained in the SEI film formed in the negative active material layer is defined such that the center P amount in the center portion in the width direction is 90% to 105% of the end portion P amount on an end portion in the width direction of the negative active material layer.

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First Claim