Hexafluorocyclotriphosphazene (HFPN) is a promising flame retardant to be applied in lithium-ion batteries (LIBs) to decrease the fire risk during the treatment of electrolyte. In this manuscript, the influence of HFPN on the combustion characteristics of LIB electrolyte was investigated, the combustion behaviors and flame retardancy of the electrolyte with or without HFPN were systematically studied by using cone calorimeter, flash point meter and a series of standard equipment, as well as self-made water spray fire extinguishing platform. The flash points of 3 kinds of control group as base solution and 3 kinds of flame-retarded electrolyte were measured and obtained by SCKB3000 closed cup automatic flash point tester. The combustion characteristics of 6 types of electrolytes were analyzed by a cone calorimeter. The heat release rate (HRR), fire growth index (FGI), fire magnitude index (FMI) and other important combustion parameters of the electrolytes were studied. Based on the self-made water mist fire extinguishing platform, the fire extinguishing effect on 6 kinds of electrolytes under the same water mist condition was compared, and the influence of flame retardants in the fire extinguishing process was analyzed. The results showed that the change of flash point was obviously related to the composition of electrolyte. Flame retardant could reduce the peak HRR (pHRR) during electrolyte fire to a large extent, while it could also prolong the combustion duration of electrolyte pool fire. Under the action of fine water mist, the electrolyte pool fire would quickly extinguish, but there would remain a lot of smoke.

中文翻译：

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阻燃剂六氟环三磷腈对锂离子电池电解液燃烧特性的影响


六氟环三磷腈（HFPN）是一种很有前途的阻燃剂，可用于锂离子电池（LIB），以降低电解液处理过程中的火灾风险。本文研究了HFPN对LIB电解液燃烧特性的影响，利用锥形量热仪、闪点仪等一系列标准设备系统研究了含HFPN和不含HFPN的电解液的燃烧行为和阻燃性能，以及自制水喷雾灭火平台。采用SCKB3000闭杯自动闪点测定仪测定并获得3种对照组基础溶液和3种阻燃电解液的闪点。采用锥形量热仪分析了6种电解液的燃烧特性。研究了电解质的热释放率（HRR）、火势增长指数（FGI）、火势指数（FMI）等重要燃烧参数。基于自制细水雾灭火平台，比较了相同细水雾条件下6种电解质的灭火效果，并分析了阻燃剂在灭火过程中的影响。结果表明，闪点的变化与电解液的组成明显相关。阻燃剂可以在很大程度上降低电解液火灾时的峰值HRR（pHRR），同时还可以延长电解液池火灾的燃烧持续时间。在细水雾的作用下，电解池火会很快熄灭，但仍残留大量烟雾。