Lithium-Ion Secondary Battery And Electrolyte Thereof

摘要

The present disclosure provides a lithium-ion secondary battery and an electrolyte thereof. The electrolyte of the lithium-ion secondary battery comprises a lithium salt; a non-aqueous solvent and an additive. The additive comprises a first additive and a second additive, the first additive is 1,3-propane sultone (PS), the second additive is 4-methylene-1,3-dioxolan-2-one and its derivatives with a structural formula 1 and/or 4,5-dimethylene-1,3-dioxolan-2-one and its derivatives with a structural formula 2; in the structural formula 1 and the structural formula 2, R1, R2, R3 and R4 each are hydrogen, halogen, C1˜C3 alkyl or halogenated alkyl; a weight percentage of the first additive in the electrolyte is 0.3%-4.0%, a weight percentage of the second additive in the electrolyte is 0.3%-4.0%. The lithium-ion secondary battery comprises the aforementioned electrolyte. The lithium-ion secondary battery of the present disclosure has better low temperature discharging performance.;

主权项

1. An electrolyte of a lithium-ion secondary battery, comprising:
a lithium salt; a non-aqueous solvent; and an additive; the additive comprising a first additive and a second additive, the first additive being 1,3-propane sultone (PS), the second additive being 4-methylene-1,3-dioxolan-2-one and its derivatives with a structural formula 1 and/or 4,5-dimethylene-1,3-dioxolan-2-one and its derivatives with a structural formula 2; in the structural formula 1 and the structural formula 2, R1, R2, R3 and R4 each being hydrogen, halogen, C1˜C3 alkyl or halogenated alkyl; a weight percentage of the first additive in the electrolyte of the lithium-ion secondary battery being 0.3%˜4.0%, a weight percentage of the second additive in the electrolyte of the lithium-ion secondary battery being 0.3%˜4.0%.