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478 results on '"Liu, Qinglei"'

15. Ultrafast High‐Volumetric Sodium‐Ion Capacitors Based on Compact Nanoarchitectured Carbon Electrodes.

Author

Fang, Yan, Li, Li, Li, Jinghan, Gan, Yang, Du, Jie, Li, Jiaxin, Chen, Xin, Pan, Hui, Zhang, Wang, Gu, Jiajun, Zhang, Di, and Liu, Qinglei

Abstract

Ultrafast carbon electrodes with high‐volumetric capacities are crucial for the fast‐developing sodium‐ion capacitors (SICs) but have rarely been achieved due to the negative correlation between electrode density and ion transport kinetics. Here, a top‐down strategy to achieve a compact carbon architecture with topological ion transport/diffusion pathways to address this obstacle is reported. The resulting freestanding carbon electrode exhibits a notable volumetric capacity of 242 mAh cm−3 at 0.05 A g−1 and unprecedented high‐rate capability of 107 mAh cm−3 at 50 A g−1. It achieves an optimal balance between energy density (60.2 Wh L−1) and power density (12859 W L−1) in a SIC device. The ultrafast and high‐volumetric performance is attributed to the synergistic effect of architecture‐enhanced rapid ion transport/diffusion and carbon nanostructure‐driven fast Na+ storage mechanisms involving adsorption/desorption, surface‐redox and solvated Na+ co‐intercalation reactions. The nanoarchitectured carbon electrodes show greatly improved Na+ diffusion coefficients throughout the potential range, resulting in an extremely short characteristic time (0.013 s) for fast Na+ storage. [ABSTRACT FROM AUTHOR]

Published
2024
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31. Biotopologically structured composite materials for low temperature energy storage.

Author

Wang, Yu, Chen, Xin, Cui, Bo, Guo, Cuiping, Li, Yao, Liu, Qinglei, Pan, Hui, and Zhang, Di

Abstract

Conventional compositing methods for energy storage materials produce disconnected ion/electron channels, leading to low energy and power densities at low temperatures. This study leverages the advantages of seaweed cell walls with topologically ordered ion transport channels and natural doping with heteroatoms, to develop an energy-saving fabrication strategy based on electrodeposition. A biotopologically structured configuration is constructed by depositing a NiCo layered double hydroxide (NiCo-LDH) array on seaweed derived porous carbon (SAC). Microstructure investigation indicates that the composite electrode (SAC/NiCo-LDH) presents an ordered structure and good two-phase interface with highly connected ion/electron transport channels. The SAC/NiCo-LDH electrode shows excellent performance with a specific capacitance of 1985 F g−1 at a current density of 1 A g−1 (76% capacitance retention at 10 A g−1) and cycle stability (80.7% capacitance retention after 10 000 cycles), more than double those prepared by a conventional hydrothermal method. Furthermore, by utilizing SAC/NiCo-LDH and SAC as positive and negative electrodes, respectively, a supercapacitor device delivers an energy density of 92.4 W h kg−1 (a power density of 0.8 kW kg−1) at room temperature, one order of magnitude higher than those of porous carbon-based devices. When using an aqueous gel electrolyte, the device exhibits an energy density of 43.7 W h kg−1 even at a low temperature of −30 °C, which is far superior to that of most low-temperature supercapacitors. This work may inspire materials design for energy storage in extreme environments. [ABSTRACT FROM AUTHOR]

Published
2024
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