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Freestanding film made by necklace-like N-doped hollow carbon with hierarchical pores for high-performance potassium-ion storage

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Abstract

Potassium-ion batteries (PIBs) have drawn much attention as a replacement for lithium-ion batteries (LIBs) owing to their low cost and high safety. However, it is still an open challenge to design stable and high-capacity nanocarbon for efficient intercalation/deintercalation of large K ions. Herein, we report a class of ultra-high pyrrolic/pyridinic-N-doped necklace-like hollow carbon (NHC) material as a novel free-standing anode for enhancing PIBs in terms of their capacity, rate ability and durability. The as-made NHC film features abundant hierarchical micro/meso/macro-pores, a necklace-like hollow structure, ultra-high pyrrolic/pyridinic-N doping and a high specific surface area, which could finally promote the intercalation/deintercalation of K ions, reduce the volume expansion and improve the stability of PIBs. These new characteristics allow the NHC to deliver a high reversible specific capacity of 293.5 mA h g−1 at 100 mA g−1, outstanding rate property (204.8 mA h g−1 at 2000 mA g−1) and cycling performance (161.3 mA h g−1 at 1000 mA g−1 after 1600 cycles), which represent the best performance for carbon-based non-metal materials for PIB anode. Density functional theory (DFT) calculations demonstrate that pyrrolic and pyridinic-N doping can efficiently change the charge density distribution of carbon and promote the adsorption of K+ on the NHC electrode, which promotes K ion storage.

Graphical abstract: Freestanding film made by necklace-like N-doped hollow carbon with hierarchical pores for high-performance potassium-ion storage

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Publication details

The article was received on 16 Feb 2019, accepted on 08 Mar 2019 and first published on 08 Mar 2019


Article type: Paper
DOI: 10.1039/C9EE00536F
Citation: Energy Environ. Sci., 2019, Advance Article

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    Freestanding film made by necklace-like N-doped hollow carbon with hierarchical pores for high-performance potassium-ion storage

    W. Yang, J. Zhou, S. Wang, W. Zhang, Z. Wang, F. Lv, K. Wang, Q. Sun and S. Guo, Energy Environ. Sci., 2019, Advance Article , DOI: 10.1039/C9EE00536F

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