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Robust and Fast Lithium Storage Enabled by Polypyrrole-Coated Nitrogen and Phosphorus Co-Doped Hollow Carbon Nanospheres for Lithium-Ion Capacitors
- Source :
- Frontiers in Chemistry, Frontiers in Chemistry, Vol 9 (2021)
- Publication Year :
- 2021
- Publisher :
- Frontiers Media S.A., 2021.
-
Abstract
- Lithium-ion capacitors (LICs) have been proposed as an emerging technological innovation that integrates the advantages of lithium-ion batteries and supercapacitors. However, the high-power output of LICs still suffers from intractable challenges due to the sluggish reaction kinetics of battery-type anodes. Herein, polypyrrole-coated nitrogen and phosphorus co-doped hollow carbon nanospheres (NPHCS@PPy) were synthesized by a facile method and employed as anode materials for LICs. The unique hybrid architecture composed of porous hollow carbon nanospheres and PPy coating layer can expedite the mass/charge transport and enhance the structural stability during repetitive lithiation/delithiation process. The N and P dual doping plays a significant role on expanding the carbon layer spacing, enhancing electrode wettability, and increasing active sites for pseudocapacitive reactions. Benefiting from these merits, the NPHCS@PPy composite exhibits excellent lithium-storage performances including high rate capability and good cycling stability. Furthermore, a novel LIC device based on the NPHCS@PPy anode and the nitrogen-doped porous carbon cathode delivers a high energy density of 149 Wh kg−1 and a high power density of 22,500 W kg−1 as well as decent cycling stability with a capacity retention rate of 92% after 7,500 cycles. This work offers an applicable and alternative way for the development of high-performance LICs.
- Subjects :
- Materials science
chemistry.chemical_element
engineering.material
Polypyrrole
law.invention
anode materials
chemistry.chemical_compound
Coating
law
QD1-999
Original Research
Supercapacitor
Conductive polymer
General Chemistry
lithium-ion capacitors
Cathode
Anode
Chemistry
chemistry
Chemical engineering
porous carbon
engineering
Lithium
heteroatom doping
Carbon
conductive polymers
hollow structure
Subjects
Details
- Language :
- English
- ISSN :
- 22962646
- Volume :
- 9
- Database :
- OpenAIRE
- Journal :
- Frontiers in Chemistry
- Accession number :
- edsair.doi.dedup.....9add8cf63939730c2fb067367dfe5abd