POWER STORAGE DEVICE AND MANUFACTURING METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a power storage device which enables the enhancement of vibration resistance, and the suppression of deformation of an electrode group.SOLUTION: A power storage device comprises: an electrode group including a positive electrode 2 having a positive electrode active material and a positive electrode collector holding the positive electrode active material, a negative electrode 3 having a negative electrode active material and a negative electrode current collector holding the negative electrode active material, and a separator 1 interposed between the positive and negative electrodes; a nonaqueous electrolyte having alkali metal ion conductivity; a case 10 for enclosing the electrode group and the nonaqueous electrolyte; and a third electrode 4 interposed between the electrode group and the case and not involved in power storage. At least the negative electrode 3 includes pre-doped alkali metal. The third electrode 4 includes a first metal porous body having porosity of 50% or more.