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公开(公告)号：US20240266516A1
公开(公告)日：2024-08-08
申请号：US18616052
申请日：2024-03-25
Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED
Inventor： Qingyan Ma , Yingjie Guan , Yuzhen Zhao , Yan Wen , Qisen Huang
CPC classification number: H01M4/366 , C01B25/45 , C01B33/32 , H01M4/1315 , H01M4/137 , H01M4/505 , H01M4/604 , H01M4/608 , C01P2002/52 , C01P2002/72 , C01P2002/85 , C01P2006/40 , H01M2004/028
Abstract: A positive electrode active material, a method for preparation thereof and a positive electrode plate, a secondary battery and an electrical device containing the same are provided. The positive electrode active material has a core-shell structure, comprising a core, a first cladding layer covering the core, a second cladding layer covering the first cladding layer, wherein the core has a chemical formula of LiaAxMn1-yByP1-zCzO4-nDn, the first cladding layer comprises a first polymer containing an electron withdrawing group, the second cladding layer comprises a second polymer, and wherein the second polymer comprises one or more of plant polysaccharides, marine polysaccharides and the derivatives thereof. The positive electrode active material of the present application enables a secondary battery to have a relatively high energy density, while further having a significantly improved rate performance, cycling performance and/or high-temperature stability.
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公开(公告)号：US11996548B2
公开(公告)日：2024-05-28
申请号：US16973152
申请日：2020-07-14
Applicant: Contemporary Amperex Technology Co., Limited
Inventor： Chengdu Liang , Yuzhen Zhao , Yingjie Guan , Yan Wen , Qisen Huang
CPC classification number: H01M4/366 , H01M4/483 , H01M4/62 , H01M2004/021 , H01M2004/027
Abstract: The present application discloses a negative active material, preparation process thereof and a secondary battery and the related battery module, battery pack and device. The negative active material comprises a core structure and a modified polymer coating layer coated on at least a part of the outer surface of the core structure, wherein the core structure comprises one or more of silicon-based materials and tin based materials; and wherein the negative active material has an infrared spectrum comprising an infrared absorption peak at the wavelength of 1450 cm−1 to 1690 cm−1, and the infrared absorption peak has a transmittance T that satisfies 80%≤T≤99%.
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公开(公告)号：US11855289B2
公开(公告)日：2023-12-26
申请号：US17563071
申请日：2021-12-28
Applicant: Contemporary Amperex Technology Co., Limited
Inventor： Chengdu Liang , Yuzhen Zhao , Yingjie Guan , Yan Wen , Qisen Huang
IPC: H01M4/62 , H01M4/04 , H01M4/36 , H01M10/0525 , H01M4/02
CPC classification number: H01M4/62 , H01M4/0402 , H01M4/364 , H01M10/0525 , H01M2004/021 , H01M2004/027
Abstract: The present application provides a negative electrode active material, a process, a battery, a battery module, a battery pack and an apparatus related to the same. The negative electrode active material comprises a core material and a polymer modified coating on at least a part of a surface of core material; wherein the core material is one or more of a silicon-based negative electrode material and a tin-based negative electrode material; the negative electrode active material has a weight loss rate satisfying 0.2%≤weight loss rate≤2% in a thermogravimetric analysis test wherein temperature is elevated from 25° C. to 800° C. under a non-oxidizing inert gas atmosphere. The present application can reduce damage to the surface structure of the negative electrode active material, reduce loss of active ions and capacity, meanwhile can well improve coulomb efficiency and cycle performance of the battery.
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公开(公告)号：US11476457B2
公开(公告)日：2022-10-18
申请号：US17586754
申请日：2022-01-27
Applicant: Contemporary Amperex Technology Co., Limited
Inventor： Chengdu Liang , Yuzhen Zhao , Yingjie Guan , Yan Wen , Qisen Huang
Abstract: The present application discloses a negative active material, a method for preparing the same, and related secondary batteries, battery modules, battery packs and apparatus. The negative active material includes a core material and a polymer-modified coating layer on at least a part of its surface; the core material includes one or more of silicon-based materials and tin-based materials; the coating layer includes sulfur element and carbon element; in the Raman spectrum of the negative active material, the negative active material has scattering peaks at the Raman shifts of 900 cm−1˜960 cm−1, 1300 cm−1˜1380 cm−1 and 1520 cm−1˜1590 cm−1, respectively, in which the scattering peak at the Raman shift of 900 cm−1˜960 cm−1 has a peak intensity recorded as Il, the scattering peak at the Raman shift of 1520 cm−1˜1590 cm−1 has a peak intensity recorded as IG, and Il and IG satisfy 0.2≤Il/IG≤0.8.
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