In this review, recent advances in lithium battery flame retardant technology are summarized. Special attentions are paid on the flammability and thermal stability of a variety of battery flame retardant technology including flame-retardant electrolyte and separator.
The battery consists of electrolyte, separator, electrode and shell, the traditional flame retardant method of battery is to modify the components to improve its flame safety.
It is possible to consider adding multiple flame retardants utilizing the synergistic effect between different flame retardants to achieve better flame retardancy. Developing simple and low-cost flame-retardant solid polymer electrolytes is also a development direction for Li-metal batteries.
New battery flame retardant technologies and their flame retardant mechanisms are introduced. As one of the most popular research directions, the application safety of battery technology has attracted more and more attention, researchers in academia and industry are making efforts to develop safer flame retardant battery.
Adding flame retardants to increase flame retardancy will inevitably increase battery costs. To meet the needs of commercial large-scale production, it is necessary to reduce the cost of flame-retardant electrolytes.
As the most flammable component of the battery, battery electrolyte plays a leading role in the flame retardant transformation of the battery. By adding flame retardants to electrolytes or preparing nonflammable solid electrolytes, the flame retardancy of batteries can be effectively improved.