As the most investigated cathode of thermal batteries, the electrochemical performance of CoS₂ is limited by a big polarization at high current density and low working temperature, which is ascribed to the poor wettability of molten salt on CoS₂ surface and low exchange current density. In this contribution, Al₂O₃ is selected as a modifier to improve the wettability of molten salt on CoS₂ surface and exchange current density at the same time, by adjusting the dielectric polarization field of CoS₂ surface. The discharge capacity (V ≥ 1.7 V) of CoS₂ increases by ~11% at 500 °C with a discharge current of 300 mA cm⁻², and 55% at 450 °C with a discharge current of 100 mA cm⁻², by the decoration of Al₂O₃ nanoparticles. Moreover, the influence of decorated Al₂O₃ nanoparticles on the electrochemical performance of CoS₂ are discussed.

作为研究最多的热电池正极，CoS ₂的电化学性能受到高电流密度和低工作温度下大极化的限制，这归因于熔盐对 CoS ₂表面的润湿性差和低交换电流密度。在这一贡献中，选择Al ₂ O ₃作为改性剂，通过调节CoS ₂表面的介电极化场来提高熔盐在CoS ₂表面的润湿性并同时提高交换电流密度。CoS ₂的放电容量 (V ≥ 1.7 V)在 500 °C 和 300 mA cm ^-2的放电电流下增加了约 11%，并且在 450°C 和 100 mA cm ^-2的放电电流下通过 Al ₂ O ₃纳米粒子的装饰而达到 55% 。此外，讨论了装饰的Al ₂ O ₃纳米粒子对CoS ₂电化学性能的影响。