Cathode properties of nanocrystalline Li3V1.8Al0.2(PO4)3/multi-walled carbon nanotube composites for hybrid capacitor prepared via ultra-centrifugation treatment

Katsuhiko Naoi, Kazuaki Kisu, Naohisa Okita, Mariko Shinoda, Masanori Muramatsu, Etsuro Iwama, Wako Naoi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Highly-dispersed Li3V1.8Al0.2(PO4)3 nanoparticles which are directly impregnated onto the surface of multi-walled carbon nanotubes (MWCNT) were successfully synthesized via a unique two-step process using an ultracentrifugation at 75,000 g. The synthetic procedure of the Li3V1.8Al0.2(PO4 )3/MWCNT composite involves the following two steps: i) precipitation of V1.8Al0.2O3 (10-100nm) nanoparticles on the surface of MWCNT, and ii) the subsequent transformation of the V1.8Al0.2O3 into the Li3V1.8Al0.2(PO4)3 nanoparticles without any change of their shape and dimensions. The 10% of Al-doping brought out an increase in the discharge capacity from 119 to 124mAhg-1 per Li3V2-xAlx(PO4) 3, which corresponds to a 14% increase of the Li3V2-xAlx(PO4)3 utilization ratio. The Al-doping also reduced its electric resistance by 26%. The Li3V1.8Al0.2(PO4)3/MWCNT with such an efficient electron transport can deliver excellent electrochemical performances ever attained to date; capacity density of 85mAh g-1 at a high discharge rate of 480C and stable cycle performance over 10,000 cycles at 10C rate with 85% retention of the initial capacity.

Original languageEnglish
Pages (from-to)249-255
Number of pages7
JournalElectrochemistry
Volume83
Issue number4
DOIs
Publication statusPublished - 2015
Externally publishedYes

Keywords

  • Hybrid capacitor
  • Lithium vanadium phosphate
  • Lithium-ion battery

ASJC Scopus subject areas

  • Electrochemistry

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