![]() Unfortunately, they suffer from insufficient power density and short lifespan. In particular, silicon, as the second-most abundant element on the Earth, can offer ultra-high theoretical capacity of 4,000 mA h g −1, which is more than ten times that of traditional graphite anode, so high-energy-density LIBs using silicon-based anodes show a vigorous development momentum ( Jin et al., 2017 Zuo et al., 2017). XPS PEAK FIT SOFTWARE FREE DOWNLOAD PORTABLEThe later has been employed as the predominant power source for portable electronics due to their high energy density ( Teng et al., 2020). The former has overwhelming advantages on power density and lifespan, but is limited by low energy density ( Wang et al., 2017a Guan et al., 2020). In the past decades, electrochemical energy storage devices represented by supercapacitors (SCs) and lithium-ion batteries (LIBs) have gathered global concern and extensive investigation. This work offers an applicable and alternative way for the development of high-performance LICs. Furthermore, a novel LIC device based on the 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. Benefiting from these merits, the composite exhibits excellent lithium-storage performances including high rate capability and good cycling stability. 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. 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. Herein, polypyrrole-coated nitrogen and phosphorus co-doped hollow carbon nanospheres were synthesized by a facile method and employed as anode materials for LICs. However, the high-power output of LICs still suffers from intractable challenges due to the sluggish reaction kinetics of battery-type anodes. Lithium-ion capacitors (LICs) have been proposed as an emerging technological innovation that integrates the advantages of lithium-ion batteries and supercapacitors. 2New Energy Division, ShanDong Energy Group CO., LTD., Zoucheng, China.1State Key Laboratory of Heavy Oil Processing, Institute of New Energy, College of Chemical Engineering, China University of Petroleum (East China), Qingdao, China.Mengdi Zhang 1, Xuan Zheng 1, Jiawei Mu 1, Pengfei Liu 1, Wenhan Yuan 1, Shuli Li 1, Xiaobo Wang 1, Haiqiu Fang 1, Haiyan Liu 2, Tao Xing 2, Han Hu 1* and Mingbo Wu 1* ![]()
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