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公开(公告)号：US20240322170A1
公开(公告)日：2024-09-26
申请号：US18678441
申请日：2024-05-30
Applicant: Ningde Amperex Technology Limited
CPC classification number: H01M4/583 , H01M4/382 , H01M4/5825 , H01M10/0427 , H01M2004/021 , H01M2004/027 , H01M2004/028
Abstract: An electrochemical device, including a positive electrode, wherein the positive electrode includes a positive active material layer, which includes a positive active material, the positive active material includes a first substrate and a first region disposed on a surface of the first substrate, and based on a molar content of a Co element in the first region, a molar percentage X of an M1 element in the first region is ≥0.5%, wherein M1 includes at least one of aluminum, magnesium, titanium, zirconium, manganese, lutetium, barium, nickel, lanthanum, yttrium, niobium, tungsten, calcium, sodium, selenium, or sulfur; and a negative electrode, wherein the negative electrode includes a negative active material layer; and 1.3≤Pnegative/Ppositive≤ 3.5, wherein Pnegative is a porosity of the negative active material layer, and Ppositive is a porosity of the positive active material layer.
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Patent Agency Ranking
2.发明公开公开(公告)号：US20240136518A1
公开(公告)日：2024-04-25
申请号：US18400630
申请日：2023-12-29
Applicant: Ningde Amperex Technology Limited
Inventor： Kai WANG
CPC classification number: H01M4/525 , C01G51/66 , H01M4/366 , H01M4/582 , H01M10/0567 , H01M10/4235 , H01M2004/028
Abstract: A lithium transition metal composite oxide, comprising a twin crystal structure. The twin crystal structure includes a first crystalline region and a second crystalline region. A grain boundary exists between the first crystalline region and the second crystalline region. The first crystalline region includes a first region located within 20 nm from the grain boundary. The second crystalline region includes a second region located within 20 nm from the grain boundary. An angle between a transition metal layer in the first region and a transition metal layer in the second region is 65° to 80°. By adjusting the angle between the transition metal layer in the first region and the transition metal layer in the second region to fall within 65° to 80°, it can improve stability of the twin crystal structure, and in turn, improve the cycle performance of the electrochemical device at a high voltage.
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公开(公告)号：US20220123291A1
公开(公告)日：2022-04-21
申请号：US17281046
申请日：2020-03-31
Applicant: Ningde Amperex Technology Limited
IPC: H01M4/505 , H01M4/525 , H01M10/0525
Abstract: A positive electrode material includes a lithium composite oxide, and the positive electrode material comprises stress relief particles. There are cavities inside the stress relief particles, and the cavities are closed structures. The positive electrode material that includes the stress relief particles can be used to effectively tackle a stress and relieve the stress in advance, relieve a strain of the positive electrode material used at a high voltage, avoid ruptures of particles of the positive electrode material, and enhance structural stability of the positive electrode material. The positive electrode material and the electrochemical device having the positive electrode material achieve good high-voltage cycle performance and cycle stability.
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4.发明申请公开(公告)号：US20220216481A1
公开(公告)日：2022-07-07
申请号：US17700909
申请日：2022-03-22
Applicant: Ningde Amperex Technology Limited
IPC: H01M4/62 , H01M4/131 , H01M4/525 , H01M4/505 , H01M10/0525
Abstract: A positive electrode material, an electrochemical device that uses same, and an electronic device. Specifically, a positive is a layered structure. The layered structure includes a strip-like structure containing an atom cluster. The positive electrode material according to this application helps to improve cycle performance and storage performance of the electrochemical device under a high voltage working condition.
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公开(公告)号：US20210234154A1
公开(公告)日：2021-07-29
申请号：US16652405
申请日：2020-03-17
Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED
Inventor： Kai WANG , Tao LI , Meng WANG , Pengwei CHEN
IPC: H01M4/36 , H01M4/525 , H01M4/52 , H01M10/0525
Abstract: The present application relates to a cathode material and an electrochemical device comprising the same. In particular, the present application relates to a cathode material having a surface heterophasic structure, wherein the cathode material includes a lithium cobalt oxide and an oxide of cobalt, wherein a Raman spectrum of the cathode material has characteristic peaks in the range of about 470 cm−1 to about 530 cm −1, about 560 cm−1 to about 630 cm −1 and about 650 cm −1 to about 750 cm−1, and wherein the surface heterophasic structure of the cathode material includes the lithium cobalt oxide and the oxide of cobalt. The electrochemical device using the cathode material having a surface heterophasic structure of the present application can exhibit excellent cycle performance and thermal stability.
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6.发明公开公开(公告)号：US20240282940A1
公开(公告)日：2024-08-22
申请号：US18654440
申请日：2024-05-03
Applicant: Ningde Amperex Technology Limited
Inventor： Kai WANG
CPC classification number: H01M4/366 , H01M4/38 , H01M2004/021 , H01M2004/028
Abstract: A positive active material, where a cross-section of the positive active material includes a first region and a second region. The first region has a first structure belonging to a P63mc crystalline phase structure. The second region has a second structure belonging to at least one of the following crystalline phase structures: R3m, P2/m, or P3m1. An area ratio between the first region and the second region is 1.8 to 5.4. By controlling the crystalline phase structure and the area ratio of the first region and the second region, the problems of volume expansion and shrinkage of the positive active material during deintercalation and intercalation of lithium can be alleviated, thereby reducing the thickness change rate of the positive electrode plate, and improving cycle performance of the electrochemical device at high voltage.
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