公开(公告)号：US11784306B2

公开(公告)日：2023-10-10

申请号：US17215484

申请日：2021-03-29

Applicant: Ningde Amperex Technology Limited

Inventor： Bing Jiang ,  Kefei Wang

IPC: H01M4/38 ,  H01M4/62 ,  H01M4/66 ,  H01M10/056 ,  H01M10/0562 ,  H01M10/0566 ,  H01M4/02

CPC classification number: H01M4/386 ,  H01M4/625 ,  H01M4/664 ,  H01M10/056 ,  H01M10/0562 ,  H01M10/0566 ,  H01M2004/021 ,  H01M2004/027 ,  H01M2300/0068

Abstract: A negative electrode includes a current collector and an active substance layer arranged on the current collector, and an ionic conductivity of the active substance layer is 0.01 S/m to 1 S/m. The ionic conductivity of the active substance layer is defined as 0.01 S/m to 1 S/m, so that the electrochemical device can meet requirements for fast charging, and meanwhile, lithium plating on a surface of the negative electrode of the electrochemical device can be inhibited in a fast-charging condition, ensuring safety performance of the electrochemical device.

公开(公告)号：US11527776B2

公开(公告)日：2022-12-13

申请号：US17064959

申请日：2020-10-07

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Kefei Wang ,  Qiao Zeng ,  Liangzhen Xiao ,  Fei Wu

IPC: H01M10/0566 ,  H01M10/0525 ,  H01M10/0567 ,  H01M10/0569

Abstract: An electrolyte includes a dinitrile compound, a trinitrile compound, and propyl propionate. Based on the total weight of the electrolyte, the content X of the nitrile compound and the content Y of the trinitrile compound meet the conditions represented by Formula (1) and Formula (2): {about 2 wt %≤(X+Y)≤about 11 wt % . . . (1), about 0.1≤(X/Y)≤about 8 . . . (2)}. The trinitrile compound includes at least one selected from the group consisting of: 1,3,5-pentanetricarbonitrile; 1,2,3-propanetrinitrile; 1,3,6-hexanetricarbonitrile; 1,2,6-hexanetricarbonitrile; 1,2,3-tris(2-cyanoethoxy)propane; 1,2,4-tris(2-cyanoethoxy)butane; 1,1,1-tris(cyanoethoxymethylene)ethane; 1,1,1-tris(cyanoethoxymethylene)propane; 3-methyl-1,3,5-tris(cyanoethoxy)pentane; 1,2,7-tris(cyanoethoxy)heptane; 1,2,6-tris(cyanoethoxy)hexane; and 1,2,5-tris(cyanoethoxy)pentane. The electrolyte is capable of effectively inhibiting the increase in DC internal resistance of an electrochemical device so that the electrochemical device has excellent cycle and storage performance.

公开(公告)号：US20210280911A1

公开(公告)日：2021-09-09

申请号：US17326131

申请日：2021-05-20

Applicant: Ningde Amperex Technology Limited

Inventor： Kefei Wang

IPC: H01M10/0569 ,  H01M4/13 ,  H01M10/0525 ,  H01M10/0567 ,  H01M10/48

Abstract: An electrolyte includes a fluorinated cyclic carbonate, a chain carboxylate and a multi-nitrilemulti-nitrile compound having an ether bond. Based on a total weight of the electrolyte, a weight percentage (Cf) of the fluorinated cyclic carbonate is greater than a weight percentage (Cn) of the multi-nitrilemulti-nitrile compound having an ether bond. The electrolyte can control the expansion of the electrochemical device, so that the electrochemical device has excellent cycle, storage and/or floating-charge performance.

公开(公告)号：US10833371B2

公开(公告)日：2020-11-10

申请号：US16113952

申请日：2018-08-27

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Qiao Zeng ,  Kefei Wang ,  Jiacai Cai ,  Yu Luo

IPC: H01M10/0587 ,  H01M10/04 ,  H01M2/26 ,  H01M10/0525

Abstract: A wound-type cell includes a first electrode plate; a second electrode plate; a separator, disposed between the first electrode plate and the second electrode plate; a first electrode tab electrically connected to the first electrode plate; and a second electrode tab electrically connected to the second electrode plate, in which the separator includes a third winding start end, the third winding start end is folded back to an inner side in a thickness direction and is disposed between the first electrode tab and the second electrode tab in a length direction.

公开(公告)号：US10833365B2

公开(公告)日：2020-11-10

申请号：US15605110

申请日：2017-05-25

Applicant: Ningde Amperex Technology Limited

Inventor： Kefei Wang

IPC: H01M10/0567 ,  H01M10/0525 ,  H01M10/052 ,  H01M10/0566 ,  H01M10/0564

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.

公开(公告)号：US10790513B2

公开(公告)日：2020-09-29

申请号：US16138903

申请日：2018-09-21

Applicant: Ningde Amperex Technology Limited

Inventor： Jing Jiang ,  Qiao Zeng ,  Kefei Wang

IPC: H01M4/62 ,  H01M10/0525 ,  H01M4/36 ,  H01M4/587 ,  H01M4/133 ,  H01M4/02

Abstract: The present application provides a lithium ion battery and a negative electrode thereof. The negative electrode comprises: a negative electrode active material layer and an additive comprising a metal sulfide, wherein the additive is distributed in the negative electrode active material layer, distributed on the surface of the negative electrode active material layer, or both in the negative electrode active material layer and on the surface of the negative electrode active material layer. The negative electrode of the present application may effectively improve the performance of the lithium ion battery, and greatly improve the capacity and cycle performance of the lithium ion battery.

公开(公告)号：US20200168873A1

公开(公告)日：2020-05-28

申请号：US16430409

申请日：2019-06-03

Applicant: Ningde Amperex Technology Limited

Inventor： Qiao Zeng ,  Kefei Wang ,  Liangzhen Xiao

IPC: H01M2/16 ,  H01M10/04

Abstract: The embodiments of the present application provides a wound electrode assembly formed by winding a first electrode sheet, a second electrode sheet, and an isolating membrane disposed therebetween. The wound electrode assembly includes: a first surface having a first protrusion in the thickness direction of the wound electrode assembly; a first wound electrode assembly; a second wound electrode assembly wrapping the first wound electrode assembly, the first wound electrode assembly and the second wound electrode assembly sharing the first electrode sheet and the second electrode sheet; an adhesive layer disposed between the first electrode sheet and the isolating membrane, and/or between the second electrode sheet and the isolating membrane. The purpose of the present application is at least to provide a wound electrode assembly capable of reducing the risk of misalignment of the internal structures of the electrode assembly during the falling, and retaining the shape of the electrode assembly.

公开(公告)号：US20190013549A1

公开(公告)日：2019-01-10

申请号：US15999754

申请日：2018-08-20

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Kefei Wang

IPC: H01M10/0567 ,  H01M10/0525 ,  H01M10/052

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.

公开(公告)号：US20170346136A1

公开(公告)日：2017-11-30

申请号：US15605110

申请日：2017-05-25

Applicant: Ningde Amperex Technology Limited

Inventor： Kefei Wang

IPC: H01M10/0567 ,  H01M10/0525

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.