Radial Pores in Nitrogen/Oxygen Dual‐Doped Carbon Nanospheres Anode Boost High‐Power and Ultrastable Potassium‐Ion Batteries. (19th September 2021)

• Record Type: Journal Article
• Authors: Deng, Hongli; Wang, Lei; Li, Shengyang; Zhang, Meng; Wang, Tao; Zhou, Jian; Chen, Maoxin; Chen, Song; Cao, Jinhui; Zhang, Qiusheng; Zhu, Jian; Lu, Bingan
• Is Part Of: Advanced functional materials. Volume 31:Number 51(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-09-19
• Subjects: fast de/intercalation kinetics -- high power density -- in situ Raman -- N/O dual‐doping -- potassium‐ion batteries -- radial pore structures; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202107246
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Constructing electrode materials with fast ions and electrons transport channels is an effective solution to achieve high‐power‐density and long‐cycle potassium‐ion batteries (PIBs). Herein, completely opening radial pores in N/O dual‐doped carbon nanospheres (RPCNSs) are constructed as anode for high‐power PIBs. The RPCNS with hierarchical structure (micro/meso/macropores and radial channels) and N/O dual‐doping permits speedy ions and electrons transportation within the carbon nanospheres anode, achieving a reversible capacity of 346 mAh g −1 at 50 mA g −1 after 360 cycles and long‐term cycling life over 2000 cycles without obvious capacity attenuation. The in situ Raman and kinetic analysis (in situ electrochemical impedance spectroscopy and galvanostatic intermittent titration) suggest that the exquisitely designed pore structure and heterodoping enable highly reversible electrochemical reaction and fast de/intercalation kinetics. Moreover, the full cells packaged with RPCNS anode can be fully charged in 10 s and exhibit the highest charge power density of 24 866 W kg −1 and longest cycling endurance of 5000 cycles in reported PIBs. The unique structural engineering provides a new way for high‐power density potassium‐ion storage devices. Abstract : A radial channel is constructed, and in situ nitrogen/oxygen doping in carbon nanospheres is introduced to assemble a high power density and ultralong cycling life potassium‐ion full battery anode. The hierarchical channels and N, O dual‐doping can significantly shorten the ion conveyance pathway and highly accelerate the electrons conduction, which are availed to the kinetics of electrode reactions.