Alekseeva Elena V, Novoselova Julia V, Anischenko Dmitrii V, Potapenkov Vasiliy V, Levin Oleg V
Institute of Chemistry, Saint Petersburg University, 7/9 Universitetskaya nab., 199034 St. Petersburg, Russia.
Polymers (Basel). 2023 Mar 6;15(5):1323. doi: 10.3390/polym15051323.
Electrochemical energy storage systems have a wide range of commercial applications. They keep energy and power even at temperatures up to +60 °C. However, the capacity and power of such energy storage systems reduce sharply at negative temperatures due to the difficulty of counterion injection into the electrode material. The application of organic electrode materials based on salen-type polymers is a prospective approach to the development of materials for low-temperature energy sources. Poly[Ni(CHSalen)]-based electrode materials synthesized from different electrolytes were investigated by cyclic voltammetry, electrochemical impedance spectroscopy and quartz crystal microgravimetry at temperatures from -40 °C to 20 °C. By analyzing data obtained in various electrolyte solutions, it was shown that at subzero temperatures, the process of injection into the polymer film, together with slow diffusion within the film, predominantly limit the electrochemical performance of electrode materials based on poly[Ni(CHSalen)]. It was shown that the deposition of the polymer from solutions with larger cations allow the enhancement of the charge transfer due to the formation of porous structures facilitating the counter-ion diffusion.
电化学储能系统有着广泛的商业应用。它们即使在高达+60°C的温度下也能保持能量和功率。然而，由于抗衡离子注入电极材料存在困难，此类储能系统的容量和功率在负温度下会急剧降低。基于萨伦型聚合物的有机电极材料的应用是开发低温能源材料的一种有前景的方法。通过循环伏安法、电化学阻抗谱和石英晶体微天平在-40°C至20°C的温度下研究了由不同电解质合成的基于聚[Ni(CHSalen)]的电极材料。通过分析在各种电解质溶液中获得的数据表明，在零下温度下，注入聚合物膜的过程以及膜内缓慢的扩散过程主要限制了基于聚[Ni(CHSalen)]的电极材料的电化学性能。结果表明，从含有较大阳离子的溶液中沉积聚合物，由于形成了促进抗衡离子扩散的多孔结构，从而增强了电荷转移。
