| abstract |
The present invention relates to a negative electrode for a secondary battery, and more particularly, a spiral cathode in which at least two or more wire-type negative electrodes having a negative electrode active material layer coated on a surface of a wire-type current collector are disposed in parallel to each other and spirally twisted; And a conductive layer formed surrounding the spiral cathode, and a negative electrode for a secondary battery having a spiral shape and a cable type secondary battery including the same. The present invention uses a spiral cathode in which a plurality of strands are spirally twisted, and thus, the thickness of the coated cathode active material layer is thinner than that of a single strand of cathode coated with the same anode active material, thereby facilitating diffusion of Li ions. This is excellent. In addition, since the negative electrode of the present invention has a conductive layer on its surface, separation of the negative electrode active material due to volume expansion during charging and discharging can be prevented or alleviated, and isolation of the negative electrode active material can be eliminated. |