CoS_2正极材料制备及电化学性能  

Preparation and Electrochemical Properties of CoS_2 Cathode Materials

作　　者：魏明炜 马伟民[1] 闻雷[2] 马雷[1,3] 李军[1] 葛丽芳[1] 

机构地区：[1]沈阳化工大学材料科学与工程学院,沈阳市先进陶瓷制备技术及应用重点实验室,沈阳110142 [2]中国科学院金属研究所沈阳材料科学国家联合实验室,沈阳110016 [3]东北大学材料与冶金学院,沈阳110004

出　　处：《人工晶体学报》2015年第8期2211-2216,2230,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51274143);沈阳市先进陶瓷制备技术及应用重点实验室建设项目(F12-259-1-00)

摘　　要：以CoCl2·6H2O和CS(NH2)2为水热前驱物,在不同pH值下制备了CoS2粒子,对CoS2的物相组成、微观形貌、热稳定性和正极材料电化学性能进行表征和测试。结果表明,CoS2粒子在酸性和碱性溶液中形核生长机制不同,当pH=5和pH=10时分别获得黄铁矿结构CoS2粒子其形貌为类球形和不规则块状,对应热分解温度为650℃和610℃。在100 m A/cm2放电时,两种形貌CoS2正极材料的电化学性能基本相近;800 m A/cm2放电时,类球形CoS2放电比容量较块状CoS2高9.65%,并具有优于后者的高初始放电电压及低内阻特性。CoS2 were synthesized under hydrothermal condition using cobaltous chloride hexahydrate（ CoCl2· 6H2O） and thiourea（ CS（ NH2）2） as precursors at different pH values. The phase composition,morphology,thermal stability and electrochemical properties of CoS2 cathode material were characterized and tested. The results show that there are two kinds of mechanisms about the CoS2 synthesis in acid and alkali environments,single-phase pyrite CoS2 with spherical-like and irregular block morphology can be obtained in pH = 5 and pH = 10,respectively,the decomposition temperatures are650 ℃ and 610 ℃,respectively. Then thermal batteries were assembled using the CoS2 as positive active materials. When batteries were discharged in 100 m A / cm2 current density,the first discharge platform voltage and specific capacities were basically the same of the two kinds CoS2 cathode materials. As the discharge current density increasing in 800 m A / cm2,the specific capacity of spherical-like CoS2 improved 9. 65% than the block CoS2 and it had higher discharge voltage and smaller internal resistance features than the latter.

关 键 词：水热法 CoS2 正极材料 热稳定性 电化学性能 

分 类 号：TM911.16[电气工程—电力电子与电力传动]