High power Nb-doped LiFePO4 Li-ion battery cathodes; pilot-scale synthesis and electrochemical properties

Ian D. Johnson, Ekaterina Blagovidova, Paul A. Dingwall, Dan J.L. Brett, Paul R. Shearing, Jawwad A. Darr*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)
174 Downloads (Pure)

Abstract

High power, phase-pure Nb-doped LiFePO4 (LFP) nanoparticles are synthesised using a pilot-scale continuous hydrothermal flow synthesis process (production rate of 6 kg per day) in the range 0.01–2.00 at% Nb with respect to total transition metal content. EDS analysis suggests that Nb is homogeneously distributed throughout the structure. The addition of fructose as a reagent in the hydrothermal flow process, followed by a post synthesis heat-treatment, affords a continuous graphitic carbon coating on the particle surfaces. Electrochemical testing reveals that cycling performance improves with increasing dopant concentration, up to a maximum of 1.0 at% Nb, for which point a specific capacity of 110 mAh g−1 is obtained at 10 C (6 min for the charge or discharge). This is an excellent result for a high power cathode LFP based material, particularly when considering the synthesis was performed on a large pilot-scale apparatus.

Original languageEnglish
Pages (from-to)476-481
JournalJournal of Power Sources
Volume326
Early online date15 Jul 2016
DOIs
Publication statusPublished - 15 Sep 2016

Keywords

  • Cathode material
  • Continuous hydrothermal
  • Doped
  • Li-ion battery
  • LiFePO
  • Niobium

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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