Lithium ion secondary battery, battery, and electric device

Abstract

The invention provides a lithium ion secondary battery, a battery and an electric device. The lithium ion secondary battery comprises a pole piece, the pole piece comprises a current collector and an active substance layer arranged on at least one surface of the current collector, the active substance layer comprises an active substance and an ether polymer, the active substance layer meets the formula (1) to the formula (3), and the ether polymer serves as a constituent part of the active substance layer. And uniform high infiltration points can be formed in the active material layer, and the infiltration performance of the active material layer is uniformly improved, so that the overall liquid absorption speed of the active material layer is improved, and the cycle performance of the lithium ion secondary battery is improved. Formula (1): (2) v / [lambda] > 1.00 Formula (3).

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