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公开(公告)号：US20240405218A1
公开(公告)日：2024-12-05
申请号：US18679419
申请日：2024-05-30
Applicant: Ningde Amperex Technology Limited
Inventor： Yusheng CHEN , Jiali DONG
Abstract: A secondary battery includes: a negative electrode including a negative electrode active material layer. The negative electrode active material layer includes a first active material layer having a first active material and a second active material layer having a second active material. A first button battery using lithium plate as a negative electrode and the first active material as a positive active material of a positive electrode experiences a charge and discharge test; a terminal potential slope of a lithium deintercalation curve of the first button battery is Sa; a second button battery using lithium plate as a negative electrode and the second active material as a positive active material of a positive electrode experiences a charge and discharge test; a terminal potential slope of a lithium deintercalation curve of the second button battery is Sb; Sa
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公开(公告)号：US20240372095A1
公开(公告)日：2024-11-07
申请号：US18654174
申请日：2024-05-03
Applicant: Ningde Amperex Technology Limited
Inventor： Wei TAO , Yusheng CHEN
Abstract: An electrochemical apparatus includes a negative electrode plate. The negative electrode plate includes a negative electrode current collector, a first layer, and a second layer. The first layer is located between the negative electrode current collector and the second layer. Both the first layer and the second layer include graphite; a thermal decomposition temperature of the graphite in the first layer is A, and A is greater than or equal to 800° C.; and a thermal decomposition temperature of the graphite in the second layer is B, and B ranges from 500° C. to 700° C.; and 100° C.≤A−B≤500° C. The thermal decomposition temperature A of the graphite in the first layer and the thermal decomposition temperature B of the graphite in the second layer are designed to satisfy 100° C.≤A−B≤500° C.
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3.发明公开公开(公告)号：US20240120483A1
公开(公告)日：2024-04-11
申请号：US18374695
申请日：2023-09-29
Applicant: Ningde Amperex Technology Limited
Inventor： Yuxin CAI , Yusheng CHEN , Jiali DONG
CPC classification number: H01M4/587 , H01M4/133 , H01M2004/021
Abstract: A negative electrode active material includes graphite and amorphous carbon, where according to Raman testing, the negative electrode active material satisfies: 1.6≤WD/WG≤2.6, where WD is a peak width at half height of peak D within 1340 cm−1 to 1370 cm−1 in the Raman spectrum, 40 cm−1≤WD≤100 cm−1, and WG is a peak width at half height of peak G within 1570 cm−1 to 1590 cm−1, 15 cm−1≤WG≤50 cm−1. The negative electrode active material undergoes surface treatment, where the surface thereof has a higher surface lattice defect degree, effectively improving a gram capacity and kinetics performance thereof, thereby making the electrochemical apparatus including the negative electrode active material have both high energy density and good electrochemical performance.
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公开(公告)号：US20240405204A1
公开(公告)日：2024-12-05
申请号：US18679434
申请日：2024-05-30
Applicant: Ningde Amperex Technology Limited
Inventor： Yusheng CHEN , Yuxin CAI , Jiali DONG
Abstract: A secondary battery according to this application includes a negative electrode. The negative electrode includes a current collector and a negative electrode active material layer disposed on a surface of the current collector. The negative electrode active material layer includes a first negative electrode active material layer and a second negative electrode active material layer. The first negative electrode active material layer is disposed between the current collector and the second negative electrode active material layer. The first negative electrode active material layer includes a first negative electrode active material, and the first negative electrode active material has a maximum rebound rate Ra; and the second negative electrode active material layer includes a second negative electrode active material, and the second negative electrode active material has a maximum rebound rate Rb; where 5%≤Ra≤13%, 10%≤Rb≤17%, and Ra
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