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- Title
A Site‐Selective Doping Strategy of Carbon Anodes with Remarkable K‐Ion Storage Capacity.
- Authors
Zhang, Wenli; Cao, Zhen; Wang, Wenxi; Alhajji, Eman; Emwas, Abdul‐Hamid; Costa, Pedro M. F. J.; Cavallo, Luigi; Alshareef, Husam N.
- Abstract
The limited potassium‐ion intercalation capacity of graphite hampers development of potassium‐ion batteries (PIB). Edge‐nitrogen doping is an effective approach to enhance K‐ion storage in carbonaceous materials. One shortcoming is the lack of precise control over producing the edge‐nitrogen configuration. Here, a molecular‐scale copolymer pyrolysis strategy is used to precisely control edge‐nitrogen doping in carbonaceous materials. This process results in defect‐rich, edge‐nitrogen doped carbons (ENDC) with a high nitrogen‐doping level (up to 10.5 at %) and a high edge‐nitrogen ratio (87.6 %). The optimized ENDC exhibits a high reversible capacity of 423 mAh g−1, a high initial Coulombic efficiency of 65 %, superior rate capability, and long cycle life (93.8 % retention after three months). This strategy can be extended to design other edge‐heteroatom‐rich carbons through pyrolysis of copolymers for efficient storage of various mobile ions.
- Subjects
ANODES; CARBON; STORAGE
- Publication
Angewandte Chemie, 2020, Vol 132, Issue 11, p4478
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201913368