Electrode for secondary battery, secondary battery and cable-type secondary battery comprising the same

摘要

The present invention provides an electrode for a secondary battery, more specifically an electrode for a secondary battery, comprising a current collector; an electrode active material layer formed on at least one surface or the whole outer surface of the current collector; a graphite-based coating layer formed on the top surface of the electrode active material layer and comprising graphite, a conductive material and a first polymer binder; and a porous coating layer formed on the top surface of the graphite-based coating layer and comprising a second polymer binder. Also, the present invention provides a secondary battery and a cable-type secondary battery comprising the electrode.

主权项

1. A cable-type secondary battery having a horizontal cross section and extending longitudinally, and comprising:
a core for supplying lithium ions, which comprises an electrolyte; an inner electrode comprising an open-structured inner current collector surrounding the outer surface of the core for supplying lithium ions, an inner electrode active material layer surrounding the outer surface of the inner current collector, a graphite-based coating layer formed on the outer surface of the inner electrode active material layer and comprising graphite, a conductive material and a first polymer binder, and a porous coating layer formed on the outer surface of the graphite-based coating layer and comprising a second polymer binder; a separation layer surrounding the outer surface of the inner electrode to prevent a short circuit between electrodes; and an outer electrode surrounding the outer surface of the separation layer and comprising an outer current collector and an outer electrode active material layer.