Design criteria for nanostructured Li-ion batteries

Katerina E Aifantis, S. A. Hackney, J. P. Dempsey

Research output: Contribution to journalArticle

75 Citations (Scopus)

Abstract

Extensive experimental research has indicated that active/inactive nanocomposites are promising electrode materials for rechargeable Li-ion batteries. Nanocomposite anode materials allow for capacities between 900 and 4000 mAh g-1 whereas graphitic anodes, which are currently being used by industry, allow for a much lower capacity of 372 mAh g-1. By treating the active sites (which may be comprised of Si, Sn, Al, or Bi) as nanospheres embedded in an inert matrix, linear elastic fracture mechanics are employed in order to develop design criteria for these alternative battery systems, with respect to fracture that results from the large volume expansions that the active sites undergo upon Li-insertion. In particular, the present study: (i) predicts that smaller active site volume fractions are more stable; (ii) Griffith's criterion is used to estimate the crack radius at which cracking will stop; (iii) based on the ultimate tensile strength of the inactive matrix the critical crack length at which the electrode will fracture is calculated; (iv) a theoretical estimation is made for the size of the active sites that will not allow cracks to develop and hence fracture of the electrode will be prevented. Based on the above analysis, Si active sites allow for a greater anode lifetime and therefore are preferred over Sn, furthermore the formulation can be applied to determine the most appropriate matrix materials.

Original languageEnglish (US)
Pages (from-to)874-879
Number of pages6
JournalJournal of Power Sources
Volume165
Issue number2
DOIs
StatePublished - Mar 20 2007
Externally publishedYes

Fingerprint

electric batteries
Anodes
Cracks
Electrodes
Nanocomposites
anodes
cracks
ions
Nanospheres
nanocomposites
Fracture mechanics
Volume fraction
Tensile strength
matrix materials
electrodes
fracture mechanics
electrode materials
matrices
tensile strength
insertion

Keywords

  • Active/inactive nanocomposites
  • Critical energy release rate
  • Linear elasticity

ASJC Scopus subject areas

  • Electrochemistry
  • Fuel Technology
  • Materials Chemistry
  • Energy (miscellaneous)

Cite this

Design criteria for nanostructured Li-ion batteries. / Aifantis, Katerina E; Hackney, S. A.; Dempsey, J. P.

In: Journal of Power Sources, Vol. 165, No. 2, 20.03.2007, p. 874-879.

Research output: Contribution to journalArticle

Aifantis, Katerina E ; Hackney, S. A. ; Dempsey, J. P. / Design criteria for nanostructured Li-ion batteries. In: Journal of Power Sources. 2007 ; Vol. 165, No. 2. pp. 874-879.
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