公开(公告)号：US20220216518A1

公开(公告)日：2022-07-07

申请号：US17702653

申请日：2022-03-23

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Yongkun LI ,  Kai WU ,  Shaojie TIAN

IPC: H01M10/0567 ,  H01M10/0525 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0569

Abstract: This application provides an electrolyte for lithium-ion battery, a lithium-ion battery, a battery module, a battery pack, and an apparatus. The electrolyte provided in this application includes a non-aqueous solvent, and a lithium salt and an additive that are dissolved in the non-aqueous solvent, and the additive includes a cyclosiloxane and a fluoroether. This application further provides a lithium-ion battery including the foregoing electrolyte. In the electrolyte provided in this application, the cyclosiloxane and the fluoroether are used together to synergistically react on a surface of the positive electrode, combining silicon and oxygen containing groups and fluorine and oxygen containing groups to form an interface film containing silicon, oxygen, and fluorine, which not only ensures density of the interface film, but also strengthens oxidation resistance and thermal stability of the interface film, greatly improving both storage performance and cycling performance of the lithium-ion battery under high temperature.

公开(公告)号：US20180375154A1

公开(公告)日：2018-12-27

申请号：US15997407

申请日：2018-06-04

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Shaojie TIAN ,  Changlong HAN

IPC: H01M10/0567 ,  H01M10/0569 ,  H01M10/0568 ,  H01M10/0525

Abstract: The present disclosure provides an electrolyte and a lithium-ion battery. The electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, the additive comprises one or two selected from a group consisting of methylene methanedisulfonate and ethylene sulfate, the lithium salt comprises lithium bis(fluorosulfonyl)imide, a content of the lithium bis(fluorosulfonyl)imide is 5%˜15% of a total weight of the electrolyte. The methylene methanedisulfonate and/or the ethylene sulfate may significantly decrease the impedance of the SEI membrane, the lithium bis(fluorosulfonyl)imide may improve the stability and the conductivity of the electrolyte and also inhibit the formation of hydrofluoric acid, so as to prevent the non-aqueous organic solvent from being oxidized and decomposed by the hydrofluoric acid and also inhibit the dissolving-out of the metal ions in the positive active material, therefore the lithium-ion battery may have advantages such as excellent low temperature performance, excellent rapid charging performance and long cycle life.

公开(公告)号：US20200020980A1

公开(公告)日：2020-01-16

申请号：US15572599

申请日：2017-08-24

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Shaojie TIAN ,  Changlong HAN ,  Feng JU ,  Cui ZHANG

IPC: H01M10/0567 ,  H01M10/0569 ,  H01M4/58 ,  H01M10/0525

Abstract: The present application provides a lithium iron phosphate battery. The lithium iron phosphate battery comprises: positive electrode plate comprising a positive current collector and a positive electrode film provided on the surface of the positive current collector; a negative electrode plate comprising a negative current collector and a negative electrode film provided on the surface of the negative current collector; a separator provided between the positive electrode plate and the negative electrode plate; and an electrolyte comprising an organic solvent, a lithium salt and an electrolyte additive. The electrolyte additive comprises a cyclic carbonate containing a double bond and a cyclic disulfonate represented by formula I. In formula I, A and B are each independently selected from an alkylene group having 1 to 3 carbon atoms.