Li-ion diffusion in LixNb9PO25

O. A. Drozhzhin, M. A. Vorotyntsev, S. R. Maduar, N. R. Khasanova, A. M. Abakumov, E. V. Antipov

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Wadsley-Roth phase LixNb9PO25 has been studied as a potential candidate for anode material of Li-ion batteries. Its crystal structure, which consists of ReO3-type blocks of NbO 6 octahedra connected with PO4 tetrahedra, provides a good stability and performance during Li+ insertion/removal. Li-ion chemical diffusion coefficient (Dchem) in LixNb 9PO25 was determined by means of potentiostatic intermittent titration technique and electrochemical impedance spectroscopy. Different data treatments (classical Warburg equation or the model of an electrode system with ohmic potential drop and/or slow kinetics of the interfacial Li+ ion transfer across the electrode/electrolyte interface) were used for calculation of Dchem of the Li ion inside this material; their applicability is discussed in the article. Dchem changes with the Li-ion doping degree, x, in LixNb 9PO25 and has a sharp minimum near the two-phase region at appr. 1.7 V vs. Li+/Li. These values of Dchem in Li xNb9PO25 (∼10-9-10-11 cm2 s-1) were found to be in average noticeably higher than in the widely studied anode material, Li4Ti5O 12.

Original languageEnglish
Pages (from-to)262-269
Number of pages8
JournalElectrochimica Acta
Volume89
DOIs
Publication statusPublished - 1 Feb 2013
Externally publishedYes

Keywords

  • Anode material
  • Chemical diffusion coefficient
  • Li-ion batteries

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