| abstract |
A lithium ion secondary battery comprising: a lithium ion supply core portion including an electrolyte including an electrolyte; An internal electrode including an internal current collector having an open structure surrounding the external surface of the lithium ion supply core, an internal electrode active material layer formed on a surface of the internal current collector, and a first electrolyte absorbing layer formed on an outer surface of the internal electrode active material layer; A separating layer surrounding the outer surface of the inner electrode to prevent short-circuiting of the electrode; A second electrolyte absorbing layer formed on a surface of the separating layer; And an outer electrode surrounding the outer surface of the second electrolyte absorbing layer and including an outer electrode active material layer and an outer current collector, and a cable type secondary battery having a horizontal cross section of a predetermined shape and extending in the longitudinal direction . The lithium ion supply core portion including the electrolyte of the present invention is located inside the inner electrode and the inner electrode has an open structure and the inner electrode has an electrolyte absorbing layer on the outer surface and the separating layer has an electrolyte absorbing layer on the outer surface, Since the electrolyte of the lithium ion supply core portion can be contained in the electrolyte absorption layer, the electrolyte of the lithium ion supply core portion can easily penetrate the active material of the electrode, thereby facilitating the supply of lithium ions and the exchange of lithium ions. |