Zhang, Mengdi and Zheng, Xuan and Mu, Jiawei and Liu, Pengfei and Yuan, Wenhan and Li, Shuli and Wang, Xiaobo and Fang, Haiqiu and Liu, Haiyan and Xing, Tao and Hu, Han and Wu, Mingbo (2021) Robust and Fast Lithium Storage Enabled by Polypyrrole-Coated Nitrogen and Phosphorus Co-Doped Hollow Carbon Nanospheres for Lithium-Ion Capacitors. Frontiers in Chemistry, 9. ISSN 2296-2646
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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.
Item Type: | Article |
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Subjects: | Euro Archives > Chemical Science |
Depositing User: | Managing Editor |
Date Deposited: | 01 Apr 2023 04:30 |
Last Modified: | 17 Jun 2024 05:42 |
URI: | http://publish7promo.com/id/eprint/916 |