Synthesis and electrochemical properties of xLiFePO4 ·(1-x)LiVPO4F composites prepared by aqueous precipitation and carbothermal reduction

Yi Chuan Lin, George Ting Kuo Fey*, Pin Jiun Wu, Jeng-Kuei Chang, Hsien Ming Kao

*Corresponding author for this work

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Phosphate-based compounds with the high working voltage, such as Li 3V2 (PO4)3, LiVPO4F and LiMnPO4, have been proposed as a new class of cathode materials for lithium-ion batteries. To improve the operating voltage of LiFePO4, we introduce LiVPO4F to prepare xLiFePO4 · (1-x)LiVPO4F (LFPeLVPF) composites through an aqueous precipitation and carbothermal reduction method. A series of LFP-LVPF composites have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and total organic carbon (TOC) analysis. The discharge capacity of LFPeLVPF composites for x:(1-x) = 1:0, 0.99:0.01, 0.75:0.25, 0.5:0.5, 0.25:0.75 and 0:1 at a 0.2 C-rate is 153, 160, 132, 106, 92 and 78 mAh g-1, respectively. The discharge capacity decreases with increasing mole fraction of LVPF. Moreover, the operating voltage of LFP-LVPF composites for x:(1-x) = 0.75:0.25, 0.5:0.5 or 0.25:0.75 is higher than that of LFP, and the charge/discharge plateaus around 4.35/4.15 V for LFP-LVPF composites become longer as the value of x decreases.

Original languageEnglish
Pages (from-to)63-71
Number of pages9
JournalJournal of Power Sources
Volume244
DOIs
StatePublished - 1 Jan 2013

Keywords

  • Cathode material
  • Lithium ion batteries
  • Lithium iron phosphate
  • Lithium vanadium fluorophosphates

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