MnCo2S4‐CoS1.097 Heterostructure Nanotubes as High Efficiency Cathode Catalysts for Stable and Long‐Life Lithium‐Oxygen Batteries Under High Current Conditions

Advanced Science

Shulei Chou¹  Deyuan Li²  Xue Han²  Yiming Zhang²  Yuxin Long²  Qing Xia²  Feng Dang²  Jun Wang²  Zhaorui Zhou²  Zhijia Zhang³  Lanling Zhao⁴ 

[1] Institute for Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325035 China;Key Laboratory for Liquid‐Solid Structural Evolution and Processing of Materials (Ministry of Education) Shandong University Jinan 250061 China;School of Materials Science and Engineering Tiangong University Tianjin 300387 China;School of Physics Shandong University Jinan 250100 P. R. China;

关键词: cathode catalysts;    electrocatalysis;    heterostructure;    Li‐O2 batteries;    MnCo2S4‐CoS1.097;   

DOI  :  10.1002/advs.202103302

来源: DOAJ

【 摘 要 】

Abstract Constructing the heterostructures is considered to be one of the most effective methods to improve the poor electrical conductivity and insufficient electrocatalytic properties of metal sulfide catalysts. In this work, MnCo2S4‐CoS1.097 nanotubes are successfully prepared via a reflux‐ hydrothermal process. This novel cathode catalyst delivers high discharge/charge specific capacities of 21 765/21 746 mAh g−1 at 200 mA g−1 and good rate capability. In addition, a favorable cycling stability with a fixed specific capacity of 1000 mAh g−1 at high current density of 1000 mA g−1 (167 cycles) and 2000 mA g−1 (57 cycles) are delivered. It is proposed that fast transmission of ions and electrons accelerated by the built‐in electric field, multiple active sites from the heterostructure, and nanotube architecture with large specific surface area are responsible for the superior electrochemical performance. To some extent, the rational design of this heterostructured metal sulfide catalyst provides guidance for the development of the stable and efficient cathode catalysts for Li‐O2 batteries that can be employed under high current conditions.

【 授权许可】

Unknown