Zinc Phosphides as Outstanding Sodium-Ion Battery Anodes

Ki Hun Nam, Yoon Hwa, Cheol Min Park

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


To design a high-performance sodium-ion battery anode, binary zinc phosphides (ZnP2 and Zn3P2) were synthesized by a facile solid-state heat treatment process, and their Na storage characteristics were evaluated. The Na reactivity of ZnP2 was better than that of Zn3P2. Therefore, a C-modified ZnP2-based composite (ZnP2-C) was fabricated to achieve better electrochemical performance. To investigate the electrochemical reaction mechanism of ZnP2-C during sodiation/desodiation, various ex situ analytical techniques were employed. During sodiation, ZnP2 in the composite was transformed into NaZn13 and Na3P phases, exhibiting a one-step conversion reaction. Conversely, Zn and P in NaZn13 and Na3P, respectively, were fully recombined to the original ZnP2 phase during desodiation. Owing to the one-step conversion/recombination of ZnP2 in the composite during cycling, the ZnP2-C showed high electrochemical performance with a highly reversible capacity of 883 mA h g-1 after 130 cycles with no capacity deterioration and a fast C-rate capability of 500 mA h g-1 at 1 C and 350 mA h g-1 at 3 C.

Original languageEnglish (US)
Pages (from-to)15053-15062
Number of pages10
JournalACS Applied Materials and Interfaces
Issue number13
StatePublished - Apr 1 2020
Externally publishedYes


  • metal phosphide
  • phosphorus-based anode
  • sodium-ion batteries
  • zinc phosphide
  • zinc-based anode

ASJC Scopus subject areas

  • General Materials Science


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