Ultrafast cathode characteristics of nanocrystalline-Li3V2(PO4)3/carbon nanofiber composites

Katsuhiko Naoi, Kazuaki Kisu, Etsuro Iwama, Yuki Sato, Mariko Shinoda, Naohisa Okita, Wako Naoi

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Anisotropically grown Li3V2(PO4)3 nanocrystals, which are highly dispersed and directly impregnated on the surface of a carbon nanofiber (CNF), were successfully synthesized via a two-step synthesis process: i) precipitation of nanoplated V2O3 precursors (20-200 nm); ii) transformation of the V2O3 precursor into Li3V2(PO4)3 nanoplates without size change. The direct attachment of the Li3V2(PO4)3 nanocrystals to the carbon surface improves the electronic conductivity and Li+ diffusivity of the entire Li3V2(PO4)3/CNF composite, simultaneously producing a mesoporous network (pore size of approximately 10 nm) that acts as an electrolyte reservoir owing to the pillar effect of the impregnated Li3V2(PO4)3 crystals. This ideal Li3V2(PO4)3/CNF nanostructure enabled a 480C rate (7.5 seconds) discharge with 83 mA h g-1, and 69% of capacity retention at the slowest discharge rate (1C). Such an ultrafast charge-discharge performance opens the possibility of using Li3V2(PO4)3 as a cathode material for ultrafast lithium ion batteries with a stable cycle performance over 10,000 cycles at a 10C rate, maintaining 85% of the initial capacity.

Original languageEnglish
Pages (from-to)A827-A833
JournalJournal of the Electrochemical Society
Volume162
Issue number6
DOIs
Publication statusPublished - 2015 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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