Synthesis of Jarosite and Vanadium Jarosite Analogues Using Microwave Hydrothermal Reaction and Evaluation of Composition-Dependent Electrochemical Properties

Ran Zhao, Ying Li, Candace Chan

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Polyanion compounds are attractive as electrode materials for Li-ion batteries due to their low cost, good stability, and safety. Here we used microwave hydrothermal synthesis to prepare a series of jarosite compounds, AM3(SO4)2(OH)6, where A = K, Na and M = Fe, V. Both morphology and electrochemical properties of the materials in Li half-cells showed a composition dependence. At potentials >1.5 V vs Li/Li+, an insertion-type reaction was observed in Na,Fe-jarosite but not in K,Fe-jarosite, likely due to the presence of intercalated H3O+. Reversible insertion-type reactions were observed in both vanadium jarosites between 1-4 V with capacities around 40-60 mAh/g. Below 1 V vs Li/Li+, all four jarosite compounds underwent conversion reactions with capacities 500 mAh/g observed for the Fe-jarosites. X-ray diffraction showed the jarosites became mostly amorphous at low potentials but that Li+ may insert into empty channels at higher voltages. These results show how tuning the composition of jarosite compounds may be used to obtain different electrochemical properties, which can be used to develop improved electrode materials for Li-ion batteries.

Original languageEnglish
Pages (from-to)9702-9712
Number of pages11
JournalJournal of Physical Chemistry C
Volume120
Issue number18
DOIs
Publication statusPublished - May 12 2016

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

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