Electrolyte and lithium-ion battery containing the same
AssigneeNingde Amperex Technology Limited
InventorKefei Wang
Life of this patent
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Abstract
The present application relates to the technical field of lithium-ion batteries and, specifically, relates to an electrolyte and a lithium-ion battery containing the electrolyte. The electrolyte of the present application includes a lithium salt, an organic solvent and additives, the additives include a fluorinated ether compound and an ester dimer compound, the ester dimer compound includes carbonate dimers, carboxylate dimers and sultone dimers. The lithium battery adopting the electrolyte of the present application can realize the object of high voltage, of which the highest normal working voltage can be improved to 4.4˜5.0V, and the lithium battery has good cycle performance, such as higher capacity retention rate at charge or discharge and improved service life.
Claims5
An electrolyte, comprising a lithium salt, an organic solvent and additives, the additives comprise additive A, additive B, and additive C, wherein
- the additive A contains carboxylate dimer and sultone dimer;
- the additive B is selected from a group consisting of fluoroethers and combinations thereof;
- and
- the additive C contains 1,3-propane sultone and vinylene carbonate, and a content of the additive C is from 0.01% to 10% by weight of the electrolyte,
- a structural formula of the carboxylate dimer is shown as Formula II:
- in Formula II, R21 and R23 are respectively selected from a group consisting of substituted or unsubstituted C5˜22 heteroaryl, wherein each substituting group is selected from a group consisting of halogens, C6˜26 aryl and C3˜8 cyclic alkyl;
- and
- R22 is selected from a group consisting of substituted or unsubstituted C6˜26 arylenes and radical groups composed of at least one ether bond and at least one substituted or unsubstituted C1˜12 alkylene, wherein each substituting group is selected from a group consisting of halogens;
- a structural formula of the sultone dimer is shown as Formula III:
- in Formula III, R31 and R33 are respectively selected from a group consisting of substituted or unsubstituted C5˜22 heteroaryl, wherein each substituting group is selected from a group consisting of halogens, C6˜26 aryls and C3˜8 cyclic alkyls;
- and
- R32 is selected from a group consisting of substituted or unsubstituted C6˜26 arylene, and radical groups composed of at least one ether bond and at least one substituted or unsubstituted C1˜12 alkylene, wherein each substituting group is selected from a group consisting of halogens,
- wherein a total content of the additive A and the additive B is from 0.001% to 30% by weight of the electrolyte.
Dependencies are inferred from the claim text.