Microbundles of carbon nanostructures as binder free highly conductive matrix for LiFePO4 battery cathode

Boor Singh Lalia, Tushar Shah, Raed Hashaikeh

Research output: Contribution to journalArticle

Abstract

Microbundles of carbon nanostructures (CNS) have been used to fabricate binder-free LiFePO4 electrodes. The inherent ability of CNS to form a nano-porous structure after the reassembly of CNS dispersion from solution to film-forming state is used to encapsulate the LiFePO4 particles. The LiFePO4/CNS electrode shows high electrical conductivity of 9.1 S cm-1 compared to 0.4 S cm -1 for conventional LiFePO4/carbon electrodes. LiFePO4/CNS flexible electrodes shows specific discharge capacity of 56 mAh g-1, 41 mAh g-1 and 37 mAh g-1 at 1C, 3C and 5C rates respectively. These specific discharge capacities are higher than that of conventional LiFePO4/carbon electrodes i.e. 40 mAh g-1, 13 mAh g-1 and 0.01 mAh g-1 at 1C, 3C and 5C rates respectively. Improvements in the specific discharge capacity at high C-rate is attributed to highly conductive pathways between the CNS and LiFePO4 particles, which assist fast transport of electrons at the electrode/CNS interfaces and between the electrode particles for rapid electrochemical reactions.

Original languageEnglish (US)
Pages (from-to)314-319
Number of pages6
JournalJournal of Power Sources
Volume278
DOIs
StatePublished - Mar 15 2015

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Keywords

  • Carbon nanostructures
  • Electrochemical performance
  • High electrical conductivity
  • LiFePO battery electrode
  • Specific capacities

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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