Method for suppressing thermal runaway of lithium batteries

A method for suppressing thermal runaway of a lithium battery, comprising steps of:

• step (a):
• providing a lithium battery capable of performing charging and discharging, the lithium battery including an electrochemical reaction system;
• and
• step (b):
• applying a metal ion (A) and an amphoteric metal ion (B) to a positive active material layer and a negative active material layer of the lithium battery, in response to a temperature of the lithium battery reaching a temperature in a range from 70° C. to 130° C., to suppress the thermal runaway of the lithium battery by passivating the positive active material layer and the negative active material layer;
• wherein the metal ion (A) is selected from a non-lithium alkali metal ion, an alkaline earth metal ion or a combination thereof;
• wherein the metal ion (A) obtains an electron and reduces at the positive active material;
• and
• wherein the metal ion (A) and the amphoteric metal ion (B) form a polymer compound with the negative active material to passivate the negative active material layer.