公开(公告)号：US20240413316A1

公开(公告)日：2024-12-12

申请号：US18808102

申请日：2024-08-19

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Yibo Shang ,  Xiaofu Xu ,  Jianfu Pan ,  Xinyu Zhang ,  Qian Liu

IPC: H01M4/36 ,  H01M4/02 ,  H01M4/58 ,  H01M4/62

Abstract: Provided are a positive electrode material and a preparation method thereof, a composite positive electrode material, a positive electrode plate, and a secondary battery. The positive electrode material includes: a core, a first shell layer, and a second shell layer. The first shell layer wraps around a surface of the core. The second shell layer wraps around a surface of the first shell layer. The core includes a lithium manganese iron phosphate material. The first shell layer includes a polyanionic positive electrode material. The polyanionic positive electrode material contains no manganese. The second shell layer includes a hydrophobic conductive material. When ensuring a relatively high energy density of the lithium manganese iron phosphate material, the positive electrode material improves the electrical conductivity of the lithium manganese iron phosphate material, alleviates the problem of hygroscopicity, and reduces manganese dissolution during cycling.

公开(公告)号：US11749999B2

公开(公告)日：2023-09-05

申请号：US18125143

申请日：2023-03-23

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Xiaofu Xu ,  Yonghuang Ye ,  Xinyu Zhang ,  Jianfu Pan ,  Qian Liu ,  Quanguo Li

IPC: H02J7/00 ,  H01M4/525 ,  H01M4/131 ,  H01M50/51 ,  H01M10/44

CPC classification number: H02J7/0016 ,  H01M4/131 ,  H01M4/525 ,  H01M10/446 ,  H01M50/51 ,  H02J7/0048

Abstract: A battery unit may comprise a first cell type and a second cell type electrically connected at least in series, wherein the first cell type may include N first cells, the second cell type may include M second cells, and N and M are positive integers; the first cell may have a discharge cell balance rate of CB1, the second cell may have a discharge cell balance rate of CB2, with 0.5≤CB1≤CB2≤1.4, and when the battery unit is charged to 95%-100% of the state of charge, the first cell may have a corresponding open-circuit voltage change rate of not greater than 0.005 V/% SOC, and the second cell type may have a corresponding open-circuit voltage change rate greater than that of the first cell.

公开(公告)号：US20240322589A1

公开(公告)日：2024-09-26

申请号：US18672378

申请日：2024-05-23

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Xiaofu Xu ,  Yibo Shang ,  Jianfu Pan ,  Jingxuan Sun ,  Qian Liu ,  Yonghuang Ye

IPC: H02J7/00 ,  H01M4/02 ,  H01M4/36 ,  H01M4/58 ,  H01M10/0525 ,  H01M10/44 ,  H01M10/48

CPC classification number: H02J7/007182 ,  H01M4/364 ,  H01M4/582 ,  H01M4/5825 ,  H01M10/0525 ,  H01M10/44 ,  H01M10/48 ,  H02J7/0048 ,  H01M2004/028

Abstract: Embodiments of the present application provide a charging control method and a charging control apparatus of a lithium-ion battery. The charging control method includes: performing charging control on the lithium-ion battery for the ith time, so that a battery capacity value of the lithium-ion battery at a target charging cut-off voltage is 0.95C0 to 1.05C0, where C0 is a nominal capacity of the lithium-ion battery, and the target charging cut-off voltage is less than or equal to the nominal voltage of the lithium-ion battery. The charging control method and the charging control apparatus according to the embodiments of the present application are beneficial to keeping the quantity of active lithium unchanged, thereby achieving the effect of automatically supplementing the battery capacity along with aging.

公开(公告)号：US20230261175A1

公开(公告)日：2023-08-17

申请号：US18180831

申请日：2023-03-08

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Xiaofu Xu ,  Jianfu Pan ,  Xinyu Zhang ,  Yonghuang Ye ,  Jingxuan Sun ,  Qian Liu

IPC: H01M4/36 ,  H01M10/0525 ,  H01M4/58 ,  H01M4/525

CPC classification number: H01M4/364 ,  H01M4/525 ,  H01M4/5825 ,  H01M10/0525 ,  H01M2004/028

Abstract: A positive electrode active material comprising an A material and a B material, wherein the A material is at least one selected from the following single crystal materials or single crystal-like materials: LixMy(PO4)z, wherein M is selected from one or more of Ni, Co, Mn, Fe, Mg, Al, V, Zn, Zr, and F, v is the valence of M, 1≤x≤3, 1≤z≤3, and x+vy-3z=0; the A material has a Dv50 of 0.8 µm to 4.2 µm; the B material is selected from at least one of the following materials: (i) LiAO2, wherein A is Ni, Co or Mn; or (ii) LiNiaCobE1-a-bO2, wherein E is selected from at least one of Mn and Al, 0.50≤a≤0.98, and 0.001≤b≤0.3; wherein based on the total weight of the positive electrode active material, the A material is present in a mixing ratio m of 50 wt% to 97 wt%.