Co-S合金的水热法制备及电化学性能研究

发布时间：2018-12-10 15:34

【摘要】：采用水热法合成Co-S合金,并对工艺参数进行了优化。通过XRD、SEM分析了合金的表面形貌及物相的变化;用恒电流充放电测试、循环伏安以及交流阻抗对合金进行了电化学性能表征。结果表明:反应溶液填充度为70%,160℃保温12 h制得的Co-S合金含有Co与Co9S8两相,颗粒结晶度好,呈厚约50 nm的交叉薄片状。在150 mA/g的充放电电流下,Co-S合金最大放电容量可达536 mAh/g,循环50次的容量保持率为77.4%。Co-S合金电极充放电时主要发生Co与Co(OH)2之间的氧化还原反应,部分Co的不可逆脱溶,导致活性物质减少,电极容量衰减。
[Abstract]:Co-S alloy was synthesized by hydrothermal method and the process parameters were optimized. The surface morphology and phase change of the alloy were analyzed by XRD,SEM, and the electrochemical properties of the alloy were characterized by constant current charge-discharge test, cyclic voltammetry and AC impedance. The results show that the Co-S alloy prepared at 70 鈩，

本文编号：2370816