In this work, tris(2-(thiophen-2-yl) ethyl) phosphate is designed, synthesized and applied as a functional electrolyte additive for lithium ion batteries with high-voltage LiCoO₂ cathode. The tris(2-(thiophen-2-yl) ethyl) phosphate contains both of thiophen group and phosphorus element. The thiophen group forms a thinner electron conductive cathode electrolyte interphase to increase the thermal stability of LiCoO₂ to de-active the catalytic and oxidative sites. In addition, the phosphorus element enhances the interfacial lithium ion conductivities by forming LiP_xO_yF_z. Therefore, the thiophen group and phosphorus element in tris(2-(thiophen-2-yl) ethyl) phosphate work synergistically to optimize the electronic and ionic conductivity of cathode electrolyte interphase in high-voltage lithium ion batteries. As a result, when the batteries are cycled in the electrolyte with 0.1 wt% tris(2-(thiophen-2-yl) ethyl) phosphate, the Li//LiCoO₂ half cells perform high thermal stability and deliver an excellent rate capability of 140 mAh g⁻¹ at 5 C, and the graphite//LiCoO₂ full cells present a significantly improved discharge capacity and stability of 139.9 mAh g⁻¹ at 130 cycles with a high capacity retention of 90.72%.

在这项工作中，设计，合成并合成了磷酸三（2-（噻吩-2-基）乙基）磷酸酯，并将其用作具有高压LiCoO ₂阴极的锂离子电池的功能性电解质添加剂。磷酸三（2-（噻吩-2-基）乙基）磷酸酯既包含噻吩基团又包含磷元素。噻吩基团形成较薄的电子导电阴极电解质中间相，以提高LiCoO ₂的热稳定性，从而使催化位点和氧化位点失活。此外，磷元素通过形成LiP _x O _y F _z来增强界面锂离子电导率。因此，磷酸三（2-（噻吩-2-基）乙基）中的噻吩基团和磷元素具有协同作用，以优化高压锂离子电池中阴极电解质相间的电子和离子电导率。结果，当电池在含有0.1 wt％的磷酸三（2-（噻吩-2-基）乙基）酯的电解质中循环时，Li // LiCoO ₂半电池具有很高的热稳定性，并具有出色的倍率性能。在5 C下为140 mAh g ^-1，并且石墨// LiCoO ₂充满电的电池在130次循环时具有显着改善的放电容量和139.9 mAh g ^-1的稳定性，并具有90.72％的高容量保持率。