Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 13, Pages 7180-7187Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202016082
Keywords
bismuth; in situ characterization; N-doped carbon nanocage frameworks; potassium ion batteries
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Funding
- National Natural Science Foundation of China [51772127, 51772131, 52072151, 61471307, 11874334]
- Taishan Scholars [ts201712050]
- Major Program of Shandong Province Natural Science Foundation [ZR2018ZB0317]
- Natural Science Doctoral Foundation of Shandong Province [ZR2019BEM038]
- Double-First Class Foundation of Materials and Intelligent Manufacturing Discipline of Xiamen University
- Youth Innovation Promotion Association of the CAS [2020458]
- Collaborative Innovation Program of Hefei Science Center, the CAS [2020HSC-CIP013]
- Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong
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The study developed an optimized Bi@N-CNCs electrode that showed great reversible capacities and long-term cyclic stability at high rates, providing new possibilities for anode materials in potassium ion batteries.
Metallic bismuth has drawn attention as a promising alloying anode for advanced potassium ion batteries (PIBs). However, serious volume expansion/electrode pulverization and sluggish kinetics always lead to its inferior cycling and rate properties for practical applications. Therefore, advanced Bi-based anodes via structural/compositional optimization and sur-/interface design are needed. Herein, we develop a bottom-up avenue to fabricate nanoscale Bi encapsulated in a 3D N-doped carbon nanocages (Bi@N-CNCs) framework with a void space by using a novel Bi-based metal-organic framework as the precursor. With elaborate regulation in annealing temperatures, the optimized Bi@N-CNCs electrode exhibits large reversible capacities and long-duration cyclic stability at high rates when evaluated as competitive anodes for PIBs. Insights into the intrinsic K+-storage processes of the Bi@N-CNCs anode are put forward from comprehensive in situ characterizations.
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