Manipulation of 2D carbon nanoplates with a core-shell structure for high-performance potassium-ion batteries

K-ion batteries (KIBs) are very attractive energy storage systems for low-cost and large-scale energy storage, but the development of electrode materials with long cycle life and high rate capability for KIBs remains a major challenge. Here, quasi-two-dimensional (2D) core-shell nanostructured carbo...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (34), p.19929-19938
Main Authors: Li, Dongjun, Cheng, Xiaolong, Xu, Rui, Wu, Ying, Zhou, Xuefeng, Ma, Cheng, Yu, Yan
Format: Article
Language:English
Subjects:
Anodes
Batteries
Carbon
Core-shell structure
Electrode materials
Electrodes
Energy storage
Ion storage
Potassium
Rechargeable batteries
Specific capacity
Storage batteries
Storage systems
Structural hierarchy
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Summary:K-ion batteries (KIBs) are very attractive energy storage systems for low-cost and large-scale energy storage, but the development of electrode materials with long cycle life and high rate capability for KIBs remains a major challenge. Here, quasi-two-dimensional (2D) core-shell nanostructured carbon nanoplates are used to design and fabricate a high-performance anode for KIBs. The quasi-2D core-shell amorphous carbon/graphitic carbon nanoplates (AC@GC) exhibit synergistic properties that enable superior K-ion storage performance. Graphitic carbon affords superior conductivity and good stability while amorphous carbon with a high nitrogen content can offer more ion storage sites. Additionally, a 2D nanoporous structure usually offers continuous transport pathways for both ions and electrons. As an anode for KIBs, the AC@GC delivers a high reversible specific capacity (310 mA h g −1 at 100 mA g −1 after 200 cycles), and exhibits outstanding rate properties (170 and 120 mA h g −1 at 2 and 5 A g −1 , respectively) and cycling performance (192 mA h g −1 at 1 A g −1 after 5200 cycles). This work suggests that combining a quasi-2D core-shell nanostructure with a hierarchical porous structure is a promising strategy to design long-cycle-life electrodes for KIBs. Quasi-2D core-shell amorphous carbon/graphitic carbon nanoplates (AC@GC) are designed, and they exhibit synergistic properties that enable the construction of superior K-ion batteries.
ISSN:2050-7488
2050-7496
DOI:10.1039/c9ta04663a