Lithium-ion secondary batteries and power consumption devices

Abstract

The present invention provides a lithium-ion secondary battery (5) and a power consumption device. The lithium-ion secondary battery (5) contains an electrolyte, the electrolyte contains alkali metal ions whose ionic radius is larger than that of lithium ions and a film-forming additive, and the mass content A of alkali metal ions and the mass content B of the additive are given by 0.10 ≤ B / A ≤ 6 × 10⁻¹⁰ based on the total mass of the electrolyte. 4 The lithium-ion secondary battery (5) satisfies the requirements. It has relatively low DC impedance and excellent cycle performance.

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