Anode Failure Hunter with a Self-Quenched Function Boosting Lithium-Ion Battery Safety

Safety issues significantly influence the iterative application of lithium-ion batteries (LIBs), and they have become a critical challenge that requires immediate resolution. Herein, a new type of self-quenched battery with an anode failure hunter was developed in which a high flame retardant was utilized to react with the LixC6 of the anode, making it ineffective at a temperature range of 90–120 °C, avoiding its reaction with the oxygen produced by the cathode and blocking the occurrence of a large scale chain exothermic reaction (O2 + LixC6). After the anode failure hunter was assembled as a self-quenched battery, the onset temperature of the self-quenched battery was increased by 15.5 °C, improving battery safety from the intrinsic level. More importantly, the energy release of the thermal runaway for the self-quenched battery has been reduced by 123.7 °C, significantly improving the safety of the battery. Therefore, such work could provide a new strategy to design devices for solving the safety issue in LIBs.