公开(公告)号：US20220328842A1

公开(公告)日：2022-10-13

申请号：US17709572

申请日：2022-03-31

Applicant: Ningde Amperex Technology Limited

Inventor： Wenhao Guan ,  Maohua Chen ,  Yuansen Xie

IPC: H01M4/62 ,  H01M4/38 ,  H01M4/134 ,  H01M10/052

Abstract: A negative electrode plate includes a negative current collector, a lithium metal negative electrode, and a negative electrode framework. A polarization electric field exists inside the negative electrode framework. A direction of the polarization electric field is directed from a surface of the negative electrode to the negative current collector. A material of the negative electrode framework includes at least one of a piezoelectric polymer, piezoelectric ceramic, or piezoelectric monocrystal. The negative electrode plate can control lithium deposition sites, effectively suppress the growth of lithium dendrites, effectively mitigate volume expansion of the electrochemical device, and further improve cycle performance of the electrochemical device.

公开(公告)号：US20220320522A1

公开(公告)日：2022-10-06

申请号：US17709023

申请日：2022-03-30

Applicant: Ningde Amperex Technology Limited

Inventor： Wenhao Guan ,  Maohua Chen ,  Yuansen Xie

IPC: H01M4/66 ,  H01M10/0525

Abstract: A negative electrode plate includes a negative current collector and a piezoelectric layer. A polarization electric field exists on the piezoelectric layer. A direction of the polarization electric field is directed from the negative current collector to a surface of a negative electrode. A material of the piezoelectric layer includes at least one of a piezoelectric polymer, piezoelectric ceramic, piezoelectric monocrystal, or an inorganic piezoelectric material. The negative electrode plate can control lithium deposition sites, effectively suppress the growth of lithium dendrites, and significantly improve the cycle performance and safety performance of the lithium metal battery.