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Additionally, the newly developed FALICs can be woven into the flexible textile to power wearable electronics. By paring with the self-standing LiCoO 2/CNTF battery-type cathode, a prototype quasi-solid-state FALIC with a maximum operating voltage of 2.0 V is constructed, achieving impressive specific capacitance (253.1 mF cm −2) and admirable energy density (39.6 mWh cm −3). Further density functional theory calculations reveal that the MoS 2O 3 nano-heterostructure possesses better electrical conductivity and stronger adsorption energy of Li + than those of the individual MoS 2 and α-Fe 2O 3.
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Originating from the unique core/shell architecture and prominent synergetic effects for multi-components, the resulting MoS 2O 3/CNTF anode delivers a remarkable specific capacitance of 2077.5 mF cm −2 (554.0 F cm −3) at 2 mA cm −2, substantially outperforming most of the previously reported fibrous anode materials. Here, hierarchical MoS 2O 3 core–shell heterostructures consisting of spindle-shaped α-Fe 2O 3 cores and MoS 2 nanosheet shells on a carbon nanotube fiber (CNTF) are successfully fabricated. However, the lack of high-capacitance fibrous anodes is a major bottleneck to achieve high performance FALICs.
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Fiber-shaped aqueous lithium-ion capacitors (FALICs) featured with high energy and power densities together with outstanding safety characteristics are emerging as promising electrochemical energy-storage devices for future portable and wearable electronics.