Progress in electrolyte flame retardant

The performance, operation mechanism and state-of-the-art of Li-ion battery electrolyte flame retardant additives are being summarized comprehensively in this article, including organic phosphorus flame retardant additives, nitrogen compounds flame retardant additives, halogenated carbonates flame retardant additives, silicone compounds flame retardant additive and composite flame retardant additives. In addition, flame retardant additives and film-forming additives joint using, bifunctional additive are also reviewed in detail. And the effect and mechanism of different kinds of flame retardant additives have been discussed, as well as the influence on the battery. At last, correspondingly outlook of flame retardant additives have been summarized, and some meaningful development directions, such as exploration of bifunctional additive and composite flame retardant additives, are suggested for the next generation of Li-ion batteries electrolyte.