It can be divided into two types: single walled tubes and multi walled tubes. Carbon nanotubes with one-dimensional structure are cylindrical in shape, hollow inside, and have good electronic conductivity. The fiber structure can make point-to-point contact with the active material, forming a continuous conductive network in the electrode active material, serving as a "wire", which is beneficial for improving battery capacity, rate performance, battery cycle life, and reducing battery interface impedance.