Spinel NiCo2S4 as Excellent Bi-Functional Cathode Catalysts for Rechargeable Li-O-2 Batteries
Spinel NiCo2S4 as Excellent Bi-Functional Cathode Catalysts for Rechargeable Li-O-2 Batteries
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尖晶石 NiCo2S4 作为可充电 Li-O-2 电池的优异双功能阴极催化剂
DOI：
10.1149/2.1151906jes
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发表时间：
2019
影响因子：
3.9
通讯作者：
Yuan Xianxia
中科院分区：
文献类型：
--
作者：
Xu Mengting;Hou Xiaoyan;Yu Xuebin;Ma Zi-Feng;Yang Jun;Yuan Xianxia
开发双功能催化剂是改善氧电化学动力学、提高锂氧电池性能的有效途径。本研究成功地合成了海胆状和蛋黄壳状尖晶石型NiCo 2S 4，并将其作为锂氧电池的正极催化剂进行了评价。结果表明，两种NiCo 2S 4材料对ORR/OER均具有催化活性，但海胆状NiCo 2S 4具有更快的动力学、更高的容量、更低的极化和更长的循环寿命。此外，海胆状NiCo 2S 4的锂氧电池循环性能明显优于文献报道的其它过渡金属硫化物的锂氧电池。
Developing bi-functional catalyst is an effective way to improve the kinetics of oxygen electrochemistry and promote the performance of Li-O 2 batteries. In this study, spinel NiCo 2 S 4 with urchin-like and yolk-shell morphologies were successfully synthesized and evaluated as cathode catalysts for rechargeable Li-O 2 batteries. The results demonstrate both NiCo 2 S 4 materials are catalytically active toward ORR/OER, but the urchin-like NiCo 2 S 4 performs better with faster kinetics, higher capacity, lower polarization and longer cycle life. Moreover, cycling performance of the Li-O 2 batteries with urchin-like NiCo 2 S 4 is evidently better than the reported data in literatures for the batteries with many other transition metal sulfides.