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    Lithium-ion battery and its electrolyte
    1.
    发明授权
    Lithium-ion battery and its electrolyte 有权

    公开(公告)号：US10971757B2

    公开(公告)日：2021-04-06

    申请号：US15572593

    申请日：2017-08-24

    Applicant: Contemporary Amperex Technology Co., Limited

    Inventor： Jiqiong Liu ,  Changlong Han ,  Xiaomei Wang ,  Jianwei Zhu ,  Yan Zhou ,  Feng Huan ,  Kun Yu

    IPC: H01M10/0567 ,  H01M10/0525 ,  H01M4/36 ,  H01M4/38 ,  H01M4/587

    Abstract: The present invention discloses a Lithium ion battery and an electrolyte thereof, the electrolyte comprising an organic solvent, a lithium salt and an additive. The additive comprises a cyclic fluoro carbonate (A), a cyclic phosphazene (B), a cyclic sulfate and a lithium fluoro oxalate borate (D). The lithium fluoro oxalate borate (D) has following formula: Compared with the prior art, the electrolyte of the present invention may form a stable CEI and SEI film on the surface of positive and negative electrodes, protect the interface between positive and negative electrodes, improve the acidic atmosphere of Lithium ion battery electrolyte, and reduce the damage effect of HF on the interface between positive and negative electrodes, while reducing low temperature resistance of lithium-ion battery, improving cycle life, high temperature storage performance, safety performance and rate capability of lithium-ion battery.

    Electrolytic solution and lithium-ion battery
    2.
    发明授权
    Electrolytic solution and lithium-ion battery 有权

    公开(公告)号：US11239498B2

    公开(公告)日：2022-02-01

    申请号：US16390816

    申请日：2019-04-22

    Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

    Inventor： Jianwei Zhu ,  Chenghua Fu ,  Xiaomei Wang

    IPC: H01M10/0567 ,  H01M10/0525 ,  H01M4/38 ,  H01M4/134 ,  H01M4/02

    Abstract: The present disclosure relates to the technical field of lithium-ion battery, and particularly, to an electrolytic solution and a lithium-ion battery including the electrolytic solution. The electrolytic solution includes additives, and the additives include an additive A and an additive B. The additive A forms a film on the surface of the positive electrode and effectively prevents interface side reactions at the positive electrode. Comparing with the additive A, the additive B is preferentially reduced to form a film at the negative electrode, avoiding an increase in impedance and deterioration of cycling dynamic performance, etc., caused by film formation of the additive A on the negative electrode. The combination of the additive A and additive B imparts the battery with a reduced gas production, a higher capacity retention rate and a lower impedance at high temperature.

    Lithium-ion battery and its electrolyte
    3.
    发明授权
    Lithium-ion battery and its electrolyte 有权

    公开(公告)号：US10826120B2

    公开(公告)日：2020-11-03

    申请号：US15572782

    申请日：2017-08-24

    Applicant: Contemporary Amperex Technology Co., Limited

    Inventor： Jiqiong Liu ,  Changlong Han ,  Xiaomei Wang ,  Jianwei Zhu ,  Yan Zhou ,  Feng Huan ,  Kun Yu

    IPC: H01M4/38 ,  H01M4/587 ,  H01M10/0567 ,  H01M10/0525 ,  H01M4/36

    Abstract: The present invention discloses a Lithium ion battery and an electrolyte thereof, the electrolyte comprising an organic solvent, a lithium salt and an additive. The additive comprises additive (A) cyclic fluoro carbonate, additive (B) cyclic phosphazene (B), and additive (C) cyclic sulfate. The additive B cyclic phosphazene has the following general structural formula: Compared with the prior art, the electrolyte of the present invention may form a stable CEI and SEI film on the surface of positive and negative electrodes, protect the interface between positive and negative electrodes, improve the acidic atmosphere of Lithium ion battery electrolyte, and reduce the damage effect of HF on the interface between positive and negative electrodes, thereby improving cycle life, high temperature storage performance, and safety performance of lithium-ion battery.

    Electrolyte and lithium-ion battery
    6.
    发明授权
    Electrolyte and lithium-ion battery 有权

    公开(公告)号：US10797348B2

    公开(公告)日：2020-10-06

    申请号：US15845950

    申请日：2017-12-18

    Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

    Inventor： Jiqiong Liu ,  Changlong Han ,  Jianwei Zhu ,  Xiaochong Zhou ,  Feng Huan

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

    Abstract: The present disclosure provides an electrolyte and a lithium-ion battery. The electrolyte comprises: an organic solvent; a lithium salt dissolved in the organic solvent; and an additive. The additive comprises trifluoromethanesulfonate silyl compound, lithium fluorophosphate compound and cyclic phosphonitrile compound. The electrolyte of the present disclosure can significantly decrease the low temperature resistance of the lithium-ion battery, and improve the power performance of the lithium-ion battery, and the electrolyte of present disclosure can also significantly inhibit the gas generation during the cycle process and the storage process of the lithium-ion battery, and significantly improve the cycle performance, the high temperature storage performance and the safety performance of the lithium-ion battery.

    ELECTROLYTE AND LITHIUM-ION BATTERY
    7.
    发明申请
    ELECTROLYTE AND LITHIUM-ION BATTERY 审中-公开

    公开(公告)号：US20180191032A1

    公开(公告)日：2018-07-05

    申请号：US15845950

    申请日：2017-12-18

    Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

    Inventor： Jiqiong Liu ,  Changlong Han ,  Jianwei Zhu ,  Xiaochong Zhou ,  Feng Huan

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

    CPC classification number: H01M10/0567 ,  H01M10/0525 ,  H01M10/0568 ,  H01M2300/0025

    Abstract: The present disclosure provides an electrolyte and a lithium-ion battery. The electrolyte comprises: an organic solvent; a lithium salt dissolved in the organic solvent; and an additive. The additive comprises trifluoromethanesulfonate silyl compound, lithium fluorophosphate compound and cyclic phosphonitrile compound. The electrolyte of the present disclosure can significantly decrease the low temperature resistance of the lithium-ion battery, and improve the power performance of the lithium-ion battery, and the electrolyte of present disclosure can also significantly inhibit the gas generation during the cycle process and the storage process of the lithium-ion battery, and significantly improve the cycle performance, the high temperature storage performance and the safety performance of the lithium-ion battery.

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