Cracking in nanostructured Li-batteries

K. E. Aifantis, J. P. Dempsey

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

During the charge/discharge cycle of rechargeable Li-batteries, Li-ions are attracted to the negative and positive electrodes interchangeably, and therefore the electrodes expand and contract repeatedly. In order to obtain complete knowledge of rechargeable Li-batteries, the mechanical behavior of the electrodes during each cycle needs to be analysed. A first attempt in this direction was by Aifantis and Hackney [1], who modelled the stress that is developed in the electrodes during the charge/discharge cycle. The most important effect, however, that this Li-insertion/de-insertion has for the electrodes is the formation of cracks, since this affects the electrochemical properties of the battery cell [1]. In the present analysis the geometry considered for both electrodes is that of long cylindrical Li-insertion sites (Sn - in the negative electrode, and LiMn2O4 - in the positive electrode) embedded in a glass matrix. A unit cell consists of a Li-insertion site, whose radius is taken to be 100nm, surrounded by a cylindrical glass area, with radius 1000nm. The cracks that develop at the Sn or LiMn2O4-glass interface are treated as being radial, in accordance with experimental evidence [1]. By choosing an appropriate displacement condition at the Li-insertion site/glass matrix interface, and by considering three different cases at the glass/glass outer boundary (i.e. stress free surface, clamped surface, self-equilibrated loading) the energy release rate is computed, which allows for the determination of the maximum crack length that can be attained during stable cracking. Sample numerical calculations are presented for the negative electrode.

Original languageEnglish (US)
Title of host publication11th International Conference on Fracture 2005, ICF11
Pages4712-4717
Number of pages6
StatePublished - Dec 1 2005
Event11th International Conference on Fracture 2005, ICF11 - Turin, Italy
Duration: Mar 20 2005Mar 25 2005

Publication series

Name11th International Conference on Fracture 2005, ICF11
Volume6

Other

Other11th International Conference on Fracture 2005, ICF11
CountryItaly
CityTurin
Period3/20/053/25/05

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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