The safety issue challenges the application of lithium ion batteries. To solve this problem, organophosphous additives are applied to construct a non-inflammable electrolyte. Herein an enhanced performance is obtained with tris(2,2,2-trifluoroethyl)phosphite (TTFP) additive for pouch lithium ion batteries. With comparable electrochemical performance, cells with optimized electrolyte come to thermal runaway at higher temperature, which indicates more stable thermal stability. On the other hand, cells with optimized electrolyte exhibit low self-discharge performance. XPS results confirm a better SEI layer, which contributes to the enhancements of the thermal stability and self-discharge. All these results show that TTFP will bring better safety performance and will be a strong candidate for applicable electrolyte.

安全问题挑战了锂离子电池的应用。为了解决该问题，有机磷添加剂被应用于构造不易燃的电解质。在此，使用用于袋装锂离子电池的三（2,2,2-三氟乙基）亚磷酸酯（TTFP）添加剂可获得增强的性能。具有可比的电化学性能，具有最佳电解质的电池在更高的温度下会发生热失控，这表明其更稳定的热稳定性。另一方面，具有优化电解质的电池表现出低的自放电性能。XPS结果证实了更好的SEI层，这有助于增强热稳定性和自放电。所有这些结果表明，TTFP将带来更好的安全性能，并将成为适用电解质的有力候选者。