Secondary battery

摘要

Example embodiments relate to a secondary battery which is capable of trapping elution of copper or nickel into ions, the copper and nickel being used as a negative current collector when charging and discharging the battery. The secondary battery according to the example embodiments includes an electrode assembly comprising a positive plate with a positive tab drawn out, a negative plate with a negative tab drawn out, and a separator disposed therebetween; a case to accommodate the electrode assembly and an electrolyte and to be formed with a sealing part; a positive lead tab and a negative lead tab of which one portions are connected to the positive tab and the negative tab, respectively, and another one portions are exposed to the outside of the case; and insulating films attached to one area of the positive lead tab and one area of the negative lead tab, respectively, the areas being in contact with the sealing part of the case, wherein the insulating film attached to the negative lead tab includes a predetermined amount of a nitrile compound.

主权项

1. A secondary battery comprising:
an electrode assembly comprising a positive plate with a positive tab, a negative plate with a negative tab, and a separator disposed therebetween; a case configured to accommodate the electrode assembly; an electrolyte; a positive lead tab connected to the positive tab; a negative lead tab connected to the negative tab wherein the negative plate comprises a first metal; insulating films attached to at least the connected portion of the positive lead tab and the negative lead tab, and wherein the insulating film comprises from about 3% to about 10% of a ligand capable of forming a complex with ions of the first metal.