A Site-Selective Doping Strategy of Carbon Anodes with Remarkable K-Ion Storage Capacity
Zhang, Cao, Wang, Alhajji, Emwas, Costa, Cavallo, Alshareef (2020) A Site-Selective Doping Strategy of Carbon Anodes with Remarkable K-Ion Storage Capacity Angew Chem Int Ed Engl (IF: -1) 59(11) 4448-4455Abstract
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.© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Links
http://www.ncbi.nlm.nih.gov/pubmed/31943603http://dx.doi.org/10.1002/anie.201913368
