Metastable trigonal SnP: A promising anode material for potassiumion battery

Potassium-ion batteries (PIBs) have attracted great interest due to their high-energy-density and low cost. The lack of stable anode material greatly limits the quick development of PIBs. Phosphorus-metal compounds are regarded as a class of materials with promising prospects as anode material for PIBs with a low operating voltage and high conductivity. Among them, due to the challenging synthesis method, the application of SnP is limited. Herein, a facile approach to synthesize trigonal SnP@C through alloying red phosphorus with tin on carbon material is reported. It is found that carbon substrate can largely reduce vibrational and configurational entropies, playing a critical role on the formation of metastable SnP. When applied as anode in PIBs, the SnP@C composite delivers a high reversible capacity of 478.1 mAh/g at 50 mA/g and a stable cycling performance at 1000 mA/g. The good electrochemical performance is associated with the SnP@C as well as the carbon, which could suppress the phase separation during charge/discharge process to maintain structural stability. This work may open a new avenue for low-cost synthesis of metastable phases for advanced energy storage systems.

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Work Title Metastable trigonal SnP: A promising anode material for potassiumion battery
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Penn State
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  1. Shunli Shang
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Work Type Article
Publication Date March 24, 2020
Deposited February 25, 2021

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  • Added Creator Shunli Shang
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    Description
    • Potassium-ion batteries (PIBs) have attracted great interest due to their high-energy-density and low cost. The lack of stable anode material greatly limits the quick development of PIBs. Phosphorus-metal
    • compounds are regarded as a class of materials with promising prospects as anode material for PIBs with a low operating voltage and high conductivity. Among them, due to the challenging synthesis
    • method, the application of SnP is limited. Herein, a facile approach to synthesize trigonal SnP@C through alloying red phosphorus with tin on carbon material is reported. It is found that carbon substrate can
    • largely reduce vibrational and configurational entropies, playing a critical role on the formation of metastable SnP. When applied as anode in PIBs, the SnP@C composite delivers a high reversible capacity of 478.1 mAh/g at 50 mA/g and a stable cycling performance at 1000 mA/g. The good electrochemical performance is associated with the SnP@C as well as the carbon, which could suppress the phase separation during charge/discharge process to maintain structural stability. This work may open a new avenue for low-cost synthesis of metastable phases for advanced energy storage systems.
    Publication Date
    • 2020-03-24
    License
    • https://rightsstatements.org/page/InC/1.0/
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