New fluorophosphate Li2-xNaxFe[PO4]F as cathode material for lithium ion battery

Hamdi Ben Yahia, Masahiro Shikano, Shinji Koike, Hikari Sakaebe, Mitsuharu Tabuchi, Hironori Kobayashi

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10 Citations (Scopus)

Abstract

The new compound Li1.65Na0.35Fe[PO4]F with the Li2Ni[PO4]F structure has been prepared from the analogous LiNaFe[PO4]F phase by ion exchange using LiBr in ethanol at 90 °C. The sample was characterized by powder X-ray diffraction, 57Fe M?ssbauer spectroscopy, and electrochemical measurements. Li1.65Na 0.35Fe[PO4]F crystallizes with orthorhombic symmetry, space group Pnma, with a = 10.5093(5) Å, b = 6.4999(2) Å, c = 11.0483(5) Å, V = 754.70(7) Å3, and Z = 8. The 57Fe M?ssbauer data collected at different stages of galvanometric cycling confirmed that only 1 mol of alkali metal is extractable between 1.0 V and 5.1 V vs. Li+/Li with a discharge capacity between 135 and 145 mA h g-1. Li/Na electrochemical ion exchange occurs during cycling and leads to a lithium rich phase.

Original languageEnglish
Pages (from-to)87-93
Number of pages7
JournalJournal of Power Sources
Volume244
DOIs
Publication statusPublished - 1 Jan 2013

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Keywords

  • Fluorophosphate
  • Ion Exchange
  • Lithium ion battery
  • M?ssbauer spectroscopy
  • Positive electrode

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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