Magnesium insertion into Mg0.5+y(FeyTi1-y)2 (PO4)3

Koji Makino, Yasushi Katayama, Takashi Miura, Tomiya Kishi

Research output: Contribution to journalConference article

20 Citations (Scopus)

Abstract

A series of transition metal phosphates, Mg0.5+y(FeyTi1-y)2 (PO4)3 (MFTP), modified from Mg0.5Ti2(PO4)3 (MTP) were prepared by sol-gel method and evaluated as cathode materials for rechargeable magnesium cells. The crystal structure of MFTP at 0 ≤ y ≤ 0.5 was identical to that of MTP, while their unit cell volumes were smaller than that of MTP due to introduced Mg2+ ions. Electrochemical magnesium insertion into MFTP was found possible as observed for MTP. However, the limiting extent of magnesium insertion into MFTP at 0.1 ≤ y ≤ 0.5 was small compared with MTP and remarkably dependent on the current density during discharge, suggesting that the insertion limit is determined not by the number of available sites for Mg2+ or electrons but by the mobility of Mg2+ in the host varying with the unit cell volume.

Original languageEnglish
Pages (from-to)512-514
Number of pages3
JournalJournal of Power Sources
Volume97-98
DOIs
Publication statusPublished - 2001 Jul 1
Event10th International Meeting on Lithium Batteries - Como, Italy
Duration: 2001 May 282001 Jun 2

Keywords

  • Diffusion control
  • Magnesium insertion
  • NASICON-structure
  • Sol-gel method

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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