公开(公告)号：US20230335712A1

公开(公告)日：2023-10-19

申请号：US18343046

申请日：2023-06-28

Applicant: Ningde Amperex Technology Limited

Inventor： Qunchao LIAO

IPC: H01M4/36 ,  H01M4/38 ,  H01M4/587 ,  H01M4/134 ,  H01M4/133

CPC classification number: H01M4/364 ,  H01M4/386 ,  H01M4/587 ,  H01M4/134 ,  H01M4/133 ,  H01M2004/027

Abstract: A negative electrode plate having a negative electrode material layer. The negative electrode material layer of the negative electrode plate includes a silicon-based particle and a graphite particle. In a silicon-based particle of a diameter larger than 3 μm, a Si content in a superficial region is lower than a Si content in an inner region. In this way, a surface stress of the negative electrode plate is reduced, thereby improving stability of an interface between a silicon-based particle and an electrolytic solution, and in turn, effectively improving the cycle performance of the electrochemical device and alleviating the problem of expansion and deformation.

公开(公告)号：US20240347694A1

公开(公告)日：2024-10-17

申请号：US18751884

申请日：2024-06-24

Applicant: Ningde Amperex Technology Limited

Inventor： Qunchao LIAO

IPC: H01M4/134 ,  H01M4/02 ,  H01M4/133 ,  H01M4/36 ,  H01M4/38 ,  H01M4/587 ,  H01M10/0525 ,  H01M10/0567 ,  H01M10/42

CPC classification number: H01M4/134 ,  H01M4/133 ,  H01M4/364 ,  H01M4/386 ,  H01M4/587 ,  H01M10/0525 ,  H01M10/0567 ,  H01M10/4235 ,  H01M2004/021 ,  H01M2004/027 ,  H01M2300/0025

Abstract: An electrochemical device includes a negative electrode plate. The negative electrode plate includes a negative active material layer. The negative active material layer includes a silicon-based material particle and a binder, and (B+C)/7

公开(公告)号：US20220223853A1

公开(公告)日：2022-07-14

申请号：US17708266

申请日：2022-03-30

Applicant: Ningde Amperex Technology Limited

Inventor： Qunchao LIAO

IPC: H01M4/38 ,  H01M10/0525 ,  H01M4/583

Abstract: A negative electrode material includes silicon-based particles. The silicon-based particle includes a silicon-containing matrix and a polymer layer, and the polymer layer is located on a surface of at least a part of the silicon-containing matrix and contains carbon nanotubes and a transition metal element. A lithium-ion battery prepared from the negative active material has improved cycle performance, deformation resistance and rate performance and reduced impedance.

公开(公告)号：US20220199996A1

公开(公告)日：2022-06-23

申请号：US17690252

申请日：2022-03-09

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Qunchao LIAO ,  Hang CUI ,  Yuansen XIE ,  Chao WANG

IPC: H01M4/587 ,  H01M4/38 ,  H01M4/04 ,  H01M4/36 ,  H01M10/0525 ,  H01M4/1395 ,  H01M4/1393 ,  H01M4/66

Abstract: A negative electrode material includes a silicon-based material and a carbon material. Peaks with a shift range of 1255˜1355 cm−1 and 1575˜1600 cm−1 in a Raman spectrum of the carbon material are a D peak and a G peak respectively. Peaks with a shift range of 1255˜1355 cm−1 and 1575˜1600 cm−1 in a Raman spectrum of the silicon-based material are the D peak and the G peak respectively. A scattering peak intensity ratio of D versus G peaks of the carbon material is A, and a scattering peak intensity ratio of D versus G peaks of the silicon-based material is B. 0.15≤A≤0.9, 0.8≤B≤2.0, and 0.2

公开(公告)号：US20210391567A1

公开(公告)日：2021-12-16

申请号：US17460736

申请日：2021-08-30

Applicant: Ningde Amperex Technology Limited

Inventor： Qunchao LIAO ,  Hang CUI ,  Yuansen XIE

IPC: H01M4/36 ,  H01M4/38 ,  H01M4/587 ,  H01M4/48 ,  H01M10/0525

Abstract: A negative electrode includes silicon-based particles and graphite particles, where a quantity of graphite particles present within a vertical distance of about 0 to 6 μm to respective edges of the silicon-based particles is N, and based on a total quantity of the silicon-based particles, more than about 50% of the silicon-based particles satisfy: 6≤N≤17. The negative electrode has good cycle performance, and a battery prepared by using the negative electrode has good rate performance and a low deformation rate.

公开(公告)号：US20240347712A1

公开(公告)日：2024-10-17

申请号：US18754596

申请日：2024-06-26

Applicant: Ningde Amperex Technology Limited

Inventor： Qunchao LIAO ,  Chuanshan HUA

IPC: H01M4/38 ,  H01M4/02 ,  H01M10/0525

CPC classification number: H01M4/382 ,  H01M4/386 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/027

Abstract: An electrochemical device includes a positive electrode plate, a negative electrode plate, and an electrolyte solution. The negative electrode plate includes a negative current collector and a negative electrode material layer. The negative electrode material layer includes a silicon-based composite material. The silicon-based composite material includes a silicon-based particle. Strength of the negative current collector is A MPa. A difference between a maximum value and a minimum value of a mass percent of silicon atoms in the silicon-based particle is B %, and a mass percent of silicon in the negative electrode material layer is C %, and




A
≥


10
⁢
B

+

250
⁢


(


C

1
/
4


+


1
10

/
C


)

.







This application achieves a lithium-ion battery of good cycle performance and expansion resistance.

公开(公告)号：US20220271281A1

公开(公告)日：2022-08-25

申请号：US17742715

申请日：2022-05-12

Applicant: Ningde Amperex Technology Limited

Inventor： Qunchao LIAO ,  Hang CUI ,  Yuansen XIE

IPC: H01M4/38 ,  H01M4/583 ,  H01M4/36

Abstract: An anode material includes silicon-based particles and graphite particles, wherein the average sphericity degree of the graphite particles is A, the average sphericity degree of the silicon-based particles is B, and A and B meet: 0

公开(公告)号：US20220231276A1

公开(公告)日：2022-07-21

申请号：US17708277

申请日：2022-03-30

Applicant: Ningde Amperex Technology Limited

Inventor： Qunchao LIAO

IPC: H01M4/36 ,  H01M4/38 ,  H01M4/587 ,  H01M10/0525

Abstract: A negative electrode plate including a negative electrode material layer. The negative electrode material layer of the negative electrode plate includes silicon-based particles and graphite particles, and pores are created inside the silicon-based particles, so that porosity α1 of the silicon-based particles and a percentage B of silicon in the silicon-based particles satisfy P=0.5α1/(B-α1B), where 0.2≤P≤1.6, which can effectively alleviate swelling of the silicon-based particles during lithium intercalation, thereby improving cycling performance and reducing swelling and deformation of the electrochemical apparatus.

公开(公告)号：US20220223835A1

公开(公告)日：2022-07-14

申请号：US17708508

申请日：2022-03-30

Applicant: Ningde Amperex Technology Limited

Inventor： Chao WANG ,  Qunchao LIAO ,  Hang CUI ,  Yuansen XIE

IPC: H01M4/131 ,  H01M4/62 ,  H01M4/485 ,  H01M4/66 ,  H01M10/0525

Abstract: A negative electrode includes a negative current collector and a negative active material layer. The negative active material layer includes a silicon-based material. A weight ratio R of the silicon-based material to a total weight of the negative active material layer and an absolute strength σ of the negative current collector satisfy the following formula: K=σ/(1.4×R+0.1), where K is a relation coefficient, and the relation coefficient is greater than or equal to 4,000 N/m. The electrochemical device can effectively mitigate XY expansion and deformation of the negative active material layer by using the foregoing negative electrode, thereby enhancing cycle performance and safety performance of the electrochemical device.