Affiliation:
1. School of Materials and Energy Guangzhou Key Laboratory of Low‐Dimensional Materials and Energy Storage Devices Guangdong University of Technology Guangzhou 510006 China
2. Institute for Superconducting and Electronic Materials Australian Institute for Innovative Materials University of Wollongong Innovation Campus Squires Way North Wollongong NSW 2522 Australia
3. School of Mechanical and Electrical Engineering Jiaxing Nanhu University Zhejiang 314001 China
Abstract
AbstractTransition metal tellurides (TMTes) are promising anode materials for high energy density potassium‐ion batteries (PIBs) due to their high electronic conductivity and high theoretical volumetric capacity. Most reported TMTes electrodes have limited lifespans, however, in this work, for the first time, it is revealed that the dissolution and shuttling effect of polytellurides (K5Te3 and K2Te) are the key reasons for the rapid deterioration of cycling stability in TMTe‐based conversion‐ and alloy‐type anodes. In light of this, a dual‐type N‐doped carbon‐confined CoTe2 composite material (CoTe2@NPCNFs@NC, where NPCNFs stands for N‐doped porous carbon nanofibers and NC represents N‐doped porous carbon) is proposed to suppress the dissolution and shuttle effect of polytellurides, which boosts the cycling stability up to 1000 cycles at 2 A g−1. Furthermore, various in situ and ex situ techniques and theoretical calculations are employed to systematically clarify the formation and transformation of polytellurides and to reveal the good physical confinement of the dual‐type carbon and the strong chemisorption of pyridinic‐N and pyrrolic‐N on K5Te3 and K2Te. This work highlights the important role of manipulating polytelluride in the design of long‐lifespan TMTe anodes for advanced PIBs.
Funder
National Natural Science Foundation of China
Subject
General Materials Science,Renewable Energy, Sustainability and the Environment
Cited by
10 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献