1,3,6-Hexanetricarbonitrile (HTN) has been investigated as an electrolyte additive to improve the electrochemical performance of the Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ cathode at high operating voltage (4.8 V). Linear sweep voltammetry (LSV) results indicate that HTN can improve the oxidation potential of the electrolyte. The influences of HTN on the electrochemical behaviors and surface properties of the cathode at high voltage have been investigated by galvanostatic charge/discharge test, electrochemical impedance spectroscopy (EIS), and ex-situ physical characterizations. Charge-discharge results demonstrate that the capacity retention of the Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ cathode in 1% HTN-containing electrolyte after 150 cycles at 0.5 C is improved to 92.3%, which is much higher than that in the standard electrolyte (ED). Combined with the theoretical calculation, ICP tests, XRD and XPS analysis, more stable and homogeneous interface film is confirmed to form on the cathode surface with incorporation of HTN, meanwhile, the electrolyte decomposition and the cathode structural destruction are restrained effectively upon cycling at high voltage, leading to improved electrochemical performance of Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ cathode.

1,3,6-己三腈（HTN）已作为电解质添加剂进行了研究，以改善Li _1.2 Ni _0.13 Co _0.13 Mn _0.54 O ₂阴极在高工作电压（4.8 V）下的电化学性能。线性扫描伏安法（LSV）结果表明，HTN可以提高电解质的氧化电位。通过恒电流充电/放电测试，电化学阻抗谱（EIS）和非原位物理表征，研究了HTN对高电压下阴极的电化学行为和表面性能的影响。充放电结果表明，Li _1.2 Ni _0.13 Co的容量保持率在0.5 C下经过150次循环后，在含1％HTN的电解液中的_0.13 Mn _0.54 O ₂阴极提高到92.3％，远高于标准电解液（ED）中的值。结合理论计算，ICP试验，XRD和XPS分析，证实了加入HTN可在阴极表面形成更稳定均匀的界面膜，同时在高温循环下可有效抑制电解质分解和阴极结构破坏。电压，从而改善了Li _1.2 Ni _0.13 Co _0.13 Mn _0.54 O ₂阴极的电化学性能。