【摘要】：采用水熱法合成Co-S合金,并對工藝參數(shù)進行了優(yōu)化。通過XRD、SEM分析了合金的表面形貌及物相的變化;用恒電流充放電測試、循環(huán)伏安以及交流阻抗對合金進行了電化學(xué)性能表征。結(jié)果表明:反應(yīng)溶液填充度為70%,160℃保溫12 h制得的Co-S合金含有Co與Co9S8兩相,顆粒結(jié)晶度好,呈厚約50 nm的交叉薄片狀。在150 mA/g的充放電電流下,Co-S合金最大放電容量可達536 mAh/g,循環(huán)50次的容量保持率為77.4%。Co-S合金電極充放電時主要發(fā)生Co與Co(OH)2之間的氧化還原反應(yīng),部分Co的不可逆脫溶,導(dǎo)致活性物質(zhì)減少,電極容量衰減。
[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，

本文編號：2370816