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 conductive material-coating layer formed on the top surface of the electrode active material layer and comprising a conductive material and a first polymer binder; and a porous coating layer formed on the top surface of the conductive material-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, comprising
a core for supplying lithium ions, the core including an electrolyte; an inner electrode comprising:
an open-structured inner current collector surrounding an outer surface of the core;an inner electrode active material layer surrounding an outer surface of the inner current collector;a conductive material-coating layer formed on an outer surface of the inner electrode active material layer and comprising a conductive material and a first polymer binder; anda porous coating layer formed on an outer surface of the conductive material-coating layer and comprising a second polymer binder and inorganic particles; a separation layer surrounding an outer surface of the inner electrode to prevent a short circuit between electrodes; and an outer electrode surrounding an outer surface of the separation layer and comprising an outer current collector and an outer electrode active material layer; wherein in the porous coating layer, the inorganic particles are bound to each other by the second polymer binder such that the inorganic particles are in contact with each other and interstitial volumes are formed between the inorganic particles, the interstitial volumes forming pores of the porous coating layer.