TY - JOUR
T1 - A Site-Selective Doping Strategy of Carbon Anodes with Remarkable K-Ion Storage Capacity
AU - Zhang, Wenli
AU - Cao, Zhen
AU - Wang, Wenxi
AU - Alhajji, Eman
AU - Emwas, Abdul-Hamid M.
AU - Da Costa, Pedro M. F. J.
AU - Cavallo, Luigi
AU - Alshareef, Husam N.
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): URF/1/2980-01-01
Acknowledgements: The research reported in this publication is supported by KingAbdullah University of Science and Technology (KAUST)(URF/1/2980-01-01). The computational work was performed on KAUST supercomputers. The authors thank the Core Laboratories at KAUST for their excellent support.
PY - 2020/1/13
Y1 - 2020/1/13
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/661427
UR - https://onlinelibrary.wiley.com/doi/abs/10.1002/ange.201913368
U2 - 10.1002/ange.201913368
DO - 10.1002/ange.201913368
M3 - Article
SN - 0044-8249
JO - Angewandte Chemie
JF - Angewandte Chemie
ER -