A novel fluorinated alkyl phosphonate - bis(2,2,2-trifluoroethyl) methylphosphonate (TFMP) were synthesized as flame retardant to reduce the flammability of the electrolyte with minimal impact on the electrochemical performance of the electrode. The flammability and electrochemical properties of TFMP with various contents were evaluated using self-extinguishing time (SET), conductivity test, cyclic voltammetry (CV) and glavanostatic charge and discharge test. The experimental results demonstrated that the addition of 20 vol% TFMP can make the electrolyte be hardly flammable, exhibiting high-efficiency flame retardant. Moreover, the 20 vol% TFMP-containing electrolyte also exhibited insignificant influence on graphite anode with high initial capacity of 346 mAh g⁻¹ and excellent capacity retention of 93% over 100 cycles. For LiFePO₄ cathode, the excellent electrochemical performance was observed including gradually increasing reversible capacity from 128 to 139 mAh g⁻¹ over 100 cycles in the 20 vol% TFMP-containing electrolyte. The results imply that TFMP is a promising option as highly flame-retardant and electrochemically compatible electrolyte additive for safe lithium-ion batteries.

合成了一种新型的氟化烷基膦酸酯-双（2,2,2-三氟乙基）甲基膦酸酯（TFMP）作为阻燃剂，以降低电解质的可燃性，并且对电极的电化学性能的影响最小。使用自熄时间（SET），电导率测试，循环伏安法（CV）和静电压充放电测试对各种含量的TFMP的可燃性和电化学性能进行了评估。实验结果表明，添加20％（体积）的TFMP可使电解质几乎不易燃，具有高效的阻燃性。此外，含有20体积％TFMP的电解质对石墨阳极也没有太大的影响，初始容量高达346 mAh g ^-1在100个周期内具有93％的出色容量保持率。对于LiFePO ₄阴极，观察到优异的电化学性能，包括在20体积％含TFMP的电解质中，在100个循环中将可逆容量从128 mAh g ^-1逐渐增加至139 mAh g ^-1。结果表明，TFMP作为安全锂离子电池的高阻燃性和电化学相容性电解质添加剂是一个有前途的选择。