Self-polymerized membrane derivative of branched additive for internal short protection of high safety lithium ion battery

▶ A branched oligomer additive with an imide structure was synthesized by Michael addition method. ▶ The membrane forms a self-polymerized solid electrolyte interface (SEI) after the battery has been electrochemically charged. ▶ The specific SEI can promote secondary self-polymerization on the surface of the cathode at typical onset temperatures. ▶ A self-polymerized SEI membrane prevents internal short circuits and the development of dangerous conditions in lithium ion battery.