Electrolyte and electrochemical device
AssigneeNingde Amperex Technology Limited
InventorsJuan Ma, Shuirong Zhang, Junfei Liu, Chao Tang
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Abstract
The present application relates to an electrolyte and an electrochemical device. The electrolyte includes an organic solvent, an additive and a lithium salt, the additive including a cyclic borate and a nitrile compound. The electrolyte of the present application has good stability at a high working voltage. In another embodiment of the present application, the combination of the electrolyte and an anode having a high compacted density provides a high energy density for the electrochemical device, and improves the storage, floating charge and dynamicperformance of the electrochemical device.
Claims14
An electrolyte, comprising an organic solvent, an additive and a lithium salt, the additive comprising a cyclic borate and a nitrile compound, wherein the cyclic borate has the following structure:
- wherein the organic solvent comprises a carboxylate having the following structure:
- wherein R4 and R5 are each independently an alkyl group having 1-5 carbon atoms, and
- wherein the carboxylate has a content of 10%-30%,
- wherein the additive further comprises a fluorosulfonate, based on a total weight of the electrolyte, a content of the fluorosulfonate being about 0.01% to about 5%.
An electrochemical device, comprising:
- a cathode;
- an anode;
- a separator;
- and
- an electrolyte,
- wherein the anode has a compacted density of not less than about 1.75 g/cm3, and
- wherein the electrolyte comprises an organic solvent, an additive and a lithium salt, the additive comprising a cyclic borate and a nitrile compound, wherein the cyclic borate has the following structure:
- wherein the organic solvent comprises a carboxylate having the following structure:
- wherein R4 and R5 are each independently an alkyl group having 1-5 carbon atoms, and
- wherein the carboxylate has a content of 10%-30%,
- wherein the additive further comprises a fluorosulfonate, based on a total weight of the electrolyte, a content of the fluorosulfonate being about 0.01% to about 5%.
Dependencies are inferred from the claim text.