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A Site‐Selective Doping Strategy of Carbon Anodes with Remarkable K‐Ion Storage Capacity
Author(s) -
Zhang Wenli,
Cao Zhen,
Wang Wenxi,
Alhajji Eman,
Emwas AbdulHamid,
Costa Pedro M. F. J.,
Cavallo Luigi,
Alshareef Husam N.
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201913368
Subject(s) - materials science , heteroatom , pyrolysis , faraday efficiency , doping , anode , nitrogen , graphite , chemical engineering , carbon fibers , ion , intercalation (chemistry) , enhanced data rates for gsm evolution , inorganic chemistry , chemistry , electrode , organic chemistry , optoelectronics , composite number , composite material , computer science , ring (chemistry) , engineering , telecommunications
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.