Abstract

Electrochemically synthesized thin-layer NiS electrodes were studied in lithium perchlorate dissolved in 1.3-dioxolane or in a mixture of 1.3-dioxolane and tetrahydrofuran. In the 1.3-dioxolane 1 M LiClO₄ electrolyte, the irreversible capacity was reduced by 20% сompared to the initial capacity. However, the stability of the electrochemical characteristics of NiS electrodes in redox reactions with lithium is unsatisfactory. Much better results of charge–discharge cycling of NiS electrodes were obtained in the electrolyte solutions of 1.3-dioxolane, tetrahydrofuran, and 1 M LiClO₄ demonstrating a stable reversible capacity of 400–450 mAh/g during 50–75 cycles. Using the methods of electron microscopy and IR spectroscopy with Fourier transform, it was established that the reason for the discharge capacity fading of NiS electrodes was associated with the formation of a surface film, which reduces the adhesion and cohesion of NiS particles. This, in turn, leads to a loss in the mechanical strength of NiS electrodes.

中文翻译：

---

NiS电极/电解质界面在与锂的氧化还原反应中的整体作用

摘要

在溶解于1.3-二氧戊环或1.3-二氧戊环和四氢呋喃的混合物中的高氯酸锂中研究了电化学合成的薄层NiS电极。在1.3-二氧戊环1 M LiClO ₄电解质中，不可逆容量比初始容量减少了20％。然而，NiS电极在与锂的氧化还原反应中的电化学特性的稳定性不能令人满意。在1.3-二氧戊环，四氢呋喃和1 M LiClO ₄的电解质溶液中，NiS电极的充放电循环效果更好。证明在50-75个循环中稳定的可逆容量为400-450 mAh / g。使用具有傅里叶变换的电子显微镜和红外光谱方法，可以确定NiS电极的放电容量衰减的原因与表面膜的形成有关，从而降低了NiS颗粒的附着力和内聚力。这进而导致NiS电极的机械强度的损失。