Journal
JOURNAL OF POWER SOURCES
Volume 472, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228501
Keywords
LIC; MnO; Hollow carbon; Nanofiber; Self-standing anode
Funding
- National Natural Science Foundation of China of China [21776041]
- Program for Liaoning Innovative Talents in University [XLYC1902045]
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Lithium ion capacitors (LICs), combining with the advantages of supercapacitors and batteries, are considered as one of the most attractive energy storage devices. The key point of constructing high-performance LICs is to address the sluggish kinetics behavior of battery-type anode. Herein, we demonstrate that nano-MnO with low Li-ion insertion voltage and fast kinetics can be favorably used for LICs. Self-standing hollow carbon-encapsulated MnO nanofibers film (MnO@HCF) is synthesized through a morphology-inheritance route, exhibiting high electrical conductivity, good structural stability, and continuous open channels to facilitate electrolyte ion transportation. Such a synergistic structure endows MnO@HCF with excellent electrochemical properties including a considerably enhanced capacity of 586.8 mAh g(-1) at a current density of 0.1 A g(-1). The LIC based on the MnO@HCF anode and activated carbon cathode deliver a high energy density of 87.4 Wh kg(-1) at 215 W kg(-1), under a high mass loading of 7.1 mg cm(-2). Even at an ultrahigh power density of 10750 W kg(-1), the energy density can still reach 50.6 Wh kg(-1). Additionally, the LIC exhibits a remarkable capacity retention of 98.6% after 3000 cycles at 1075 W kg(-1).
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