In order to improve the stability of high voltage electrolyte for 5 V-level LiNi_0.5Mn_1.5O₄ cathode material, adiponitrile (ADN) with high oxidation stability was selected as the main solvent, meanwhile, 2% fluoroethylene carbonate (FEC) as the additive with good film forming effect was also used. And then, the effect of 2 mol L⁻¹ LiBF₄-GBL/ADN+2% FEC on the electrochemical performance of LiNi_0.5Mn_1.5O₄ was explored at room temperature. The electrolyte system containing FEC can improve the cycle stability of the battery. At 1 C rate, the cycle capacity retention rate can reach 83% after 100 cycles, while the capacity retention rate of the electrolyte system without FEC and the ordinary commercial electrolyte system is only 77 and 68%, respectively. Besides, the rate performance of the battery with the addition of FEC also shows excellent performance, however, this kind of advantage is not obvious under the conditon of large rate. In addition, under the conditon of the synergistic effect between adiponitrile and fluoroethylene carbonate, the high-voltage electrolyte exhibits the good compatibility and lithium reversibility in the full cell with Li₄Ti₅O₁₂ as the negative electrode.

为了提高5 V级LiNi _0.5 Mn _1.5 O ₄正极材料的高压电解液的稳定性，选择具有高氧化稳定性的己二腈（ADN）作为主要溶剂，同时以2％氟代碳酸亚乙酯（FEC）作为主要溶剂。还使用了具有良好成膜效果的添加剂。然后，2 mol L ^-1 LiBF ₄ -GBL / ADN + 2％FEC对LiNi _0.5 Mn _1.5 O ₄电化学性能的影响在室温下进行了探索。包含FEC的电解液系统可以改善电池的循环稳定性。在1 C的速率下，经过100次循环后循环容量保持率可以达到83％，而没有FEC的电解质系统和普通商用电解质系统的容量保持率分别仅为77％和68％。此外，添加了FEC的电池的倍率性能也显示出优异的性能，但是，在大倍率的条件下这种优势并不明显。另外，在己二腈和碳酸氟代亚乙酯之间具有协同作用的条件下，高压电解质在具有Li ₄ Ti ₅ O ₁₂的全电池中表现出良好的相容性和锂可逆性。 作为负极。