Affiliation:
1. School of Metallurgical Engineering Anhui University of Technology Maanshan Anhui Province 243002 China
2. State Key Laboratory of Explosion Science and Technology School of Mechatronical Engineering Beijing Institute of Technology Beijing 100081 China
3. School of Metallurgy and Ecology University of Science and Technology Beijing Beijing 100083 China
Abstract
AbstractDefect‐rich carbon materials are considered as one of the most promising anodes for potassium‐ion batteries due to their enormous adsorption sites of K+, while the realization of both rate capability and cycling stability is still greatly limited by unstable electrochemical kinetics and inevitable structure degradation. Herein, an Fe3+‐induced hydrothermal‐pyrolysis strategy is reported to construct well‐tailored hybrid carbon nanotubes network architecture (PP‐CNT), in which the short‐range graphitic nanodomains are in‐situ localized in the pea pod shape hypocrystalline carbon. The N,O codoped hypocrystalline carbon region contributes to abundant defect sites for potassium ion storage, ensuring high reversible capacity. Meanwhile, the short‐range graphitic nanodomains with expanded interlayer spacing facilitate stable K+ migration and fast electron transfer. Furthermore, the finite element analysis confirms the volume expansion caused by K+ intercalation can be availably buffered due to the multidirection stress release effect of the unique porous pea pod shape, endowing carbon nanotubes with superior structural integrity. Consequently, the PP‐CNT anode exhibits superior potassium‐storage performance, including high reversible capacity, exceptional rate capability, and ultralong cycling stability. This work opens a new avenue for the fabrication of advanced carbon materials for achieving durable and fast potassium storage.
Funder
Beijing Nova Program
Natural Science Foundation of Beijing Municipality
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
6 articles.
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