公开(公告)号：US20220328828A1

公开(公告)日：2022-10-13

申请号：US17705633

申请日：2022-03-28

Applicant: Ningde Amperex Technology Limited

Inventor： Jian WU

IPC: H01M4/583 ,  H01M4/505 ,  H01M4/525

Abstract: An electrochemical device includes an electrode assembly. The electrode assembly includes a positive electrode plate. The positive electrode plate includes a positive current collector and a positive active material layer disposed on the positive current collector. The positive active material layer includes a positive active material and graphene. At least a part of the graphene is disposed on surfaces of particles of the positive active material. The technical solution of this application not only increases a compacted density of the positive active material layer and an energy density of the electrochemical device, but also reduces polarization and increases charging speed of the electrochemical device.