论文成果
Synergistically homogeneous and heterogeneous catalytic strategy enables fast sulfur electrochemical conversion kinetics
点击次数:
关键字:REDOX KINETICS; LITHIUM; BATTERIES; COMPOSITE; CATHODES
摘要:Heterostructures composing of two coupling components are of significance for the kinetic improvements of sulfur electrochemistry. However, they encounter a challenge of being incompetent to simultanesouly catalyze the soluble lithium polysulfides via both homogeneous and heterogeneous ways. In this work, a synergistic homogeneous and heterogeneous catalytic process has been implemented in a delicately designed CoTe/Te heterostructure, which is evenly distributed on a densifying carbon framework. The highly conductive CoTe component can efficiently immobilize lithium polysulfides and heterogeneously catalyze their conversion, while the Te component can homogenously catalyze the lithium polysulfides conversion in a way of forming the electrochemically active soluble polytellurosulfide species with intrinsically accelerated redox kinetics. Besides, the densified carbon framework makes a good balance between macropores and mesopores, guaranteeing the electron conduction and alleviating the electrode volume changes. Benefited from these structural merits, the LiS batteries based on CoTe/Te heterostructure host exhibit superior rate capability (778.6 mAh/g at 4C, 1.4 times higher than sulfur cathodes without heterostructures) and cycle stability (536.7 mAh/g after 1000 cycles at 2C, 1.6 times than sulfur cathodes without heterostructures).
卷号:476
期号:
是否译文:

周震芳

硕士生导师

教师拼音名称:zhouzhenfang

电子邮箱:

学历:博士研究生

学位:工学博士

毕业院校:上海大学

所属院系:材料科学与工程学院

邮箱 :

通讯/办公地址 :

崂山校区 - 山东省青岛市松岭路99号   
四方校区 - 山东省青岛市郑州路53号   
中德国际合作区(中德校区) - 山东省青岛市西海岸新区团结路3698号
高密校区 - 山东省高密市杏坛西街1号   
济南校区 - 山东省济南市文化东路80号©2015 青岛科技大学    
管理员邮箱:master@qust.edu.cn
访问量: 手机版 English 青岛科技大学

最后更新时间: ..