ELECTROCHEMICAL DEVICE AND METHOD FOR SUPPRESSING DETERIORATION OF THE ELECTROCHEMICAL DEVICE

摘要

An object is to provide an electrochemical device in which lithium deposition and reduction in battery capacity can be inhibited even when the concentration of a lithium salt in an electrolytic solution is lower than 1.0 M. Lithium deposition can be inhibited and lithium whiskers can be dissolved by applying an inversion pulse current for a short time more than once in a charging period of a secondary battery which deteriorates. By applying the inversion pulse current more than once, deterioration of a lithium-ion secondary battery due to repeated charging can be suppressed even when it is a secondary battery in which the concentration of a lithium salt in an electrolytic solution is lower than 1.0 M and therefore lithium is easily deposited.

主权项

1. An electrochemical device comprising:
a first electrode; a second electrode; and an electrolytic solution between the first electrode and the second electrode, wherein a concentration of a lithium salt dissolved in the electrolytic solution is lower than 1.0 M, wherein a first current that flows from the second electrode to the first electrode is applied, wherein a second current that flows from the first electrode to the second electrode is applied after the first current is applied, and wherein a period in which the second current is applied is shorter than a period in which the first current is applied.