Abstract: The present disclosure provides a lithium-ion battery and an electrolyte thereof. The electrolyte of the lithium-ion battery comprises: a non-aqueous organic solvent; a lithium salt discloved in the non-aqueous organic solvent; and an additive dissolved in the non-aqueous organic solvent. The additive comprises 1,3-dioxo-heterocyclic compound with a structural formula I and fluoroethylene carbonate; in the structural formula I, R1 and R2 each independently are H, methyl or ethyl; n is an integer selected from 1˜3; a weight percentage of 1,3-dioxo-heterocyclic compound with the structural formula I in the electrolyte of the lithium-ion battery is 0.05%˜5%; a weight percentage of fluoroethylene carbonate in the electrolyte of the lithium-ion battery is 1%˜8%. The lithium-ion battery comprises the aforementioned electrolyte of the lithium-ion battery.

Abstract: The present disclosure provides a lithium ion secondary battery and electrolyte solution thereof. The electrolyte solution of the lithium ion secondary battery includes a nonaqueous organic solvent, and a lithium salt dissolved in the nonaqueous organic solvent. The nonaqueous organic solvent includes a dicyano ester compound of a structure shown by Formula I, Formula II, or Formula III. Formula I represents dicyano carbonate ester compounds, Formula II represents dicyano sulfite ester compounds, Formula III represents dicyano sulfate ester compounds, and the value n is an integer between 1 and 4. The lithium ion secondary battery according to the present disclosure includes the aforementioned electrolyte solution. At a working voltage of 4.3 V or higher, the lithium ion secondary battery according to the present disclosure can effectively suppress the oxidation of the electrolyte solution and improve the storage performance of the lithium ion secondary battery at high temperature.

Abstract: The present disclosure provides a lithium-ion secondary battery and an electrolyte thereof. The electrolyte comprises a lithium salt, a non-aqueous solvent, and an additive at least containing 1,3-propyl sultone (PS) and a compound of isocyanurate structure represented by formula (1), formula (2) or formula (3); in formula (1), n is a positive integer from 1 to 3; in formula (2), n is a positive integer from 1 to 3, R1 is an alkyl of linear chain or branched chain having carbon atoms from 1 to 6, hydrogen atoms in the alkyl can be substituted by fluorine atoms partly or wholly; in formula (3), n is a positive integer from 1 to 3, R1 and R2 are alkyls of linear chain or branched chain having carbon atoms from 1 to 6, hydrogen atoms in the alkyls can be substituted by fluorine atoms partly or wholly.