Metastable trigonal SnP: A promising anode material for potassium-ion battery

Bing Li, Shunli Shang, Jiawei Zhao, Daniil M. Itkis, Xingxing Jiao, Chaofan Zhang, Zi Kui Liu, Jiangxuan Song

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


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−1 at 50 mA g−1 and a stable cycling performance at 1000 mA g−1. 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.

Original languageEnglish (US)
Pages (from-to)468-474
Number of pages7
StatePublished - Oct 30 2020

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science


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