Strategies to Avert Electrochemical Shock and Their Demonstration in Spinels
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Carter_Strategies to avert.pdf
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Author(s)
Woodford, William H.
Carter, W. Craig
Chiang, Yet-Ming
Date Issued
August 2014
Journal
Journal of the Electrochemical Society
Publisher
Electrochemical Society
Citation
Woodford, W. H., W. C. Carter, and Y.-M. Chiang. “Strategies to Avert Electrochemical Shock and Their Demonstration in Spinels.” Journal of the Electrochemical Society 161, no. 11 (August 7, 2014): F3005–F3009.
Version
Final published version
Abstract
We demonstrate that extensive electrochemical shock–electrochemical cycling induced fracture–occurs due to coherency stresses arising from first order cubic-to-cubic phase transformations in the spinels LiMn[subscript 2]O[subscript 4] and LiMn[subscript 1.5]Ni[subscript 0.5]O[subscript 4]. Electrochemical shock occurs despite the isotropy of the shape changes in these materials. This electrochemical shock mechanism is strongly sensitive to particle size; for LiMn[subscript 2]O[subscript 4] and LiMn[subscript 1.5]Ni[subscript 0.5]O[subscript 4], fracture can be averted with particle sizes smaller than ~1 μm. As a further critical test of the proposed mechanism, iron-doping was used to induce continuous solid solubility of lithium in LiMn[subscript 1.5]Ni[subscript 0.5]O[subscript 4], and shown to virtually avert electrochemical shock, while having minimal impact on the electrode potential and capacity.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Creative Commons Attribution-NonCommercial-NoDerivs License
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DOI of Published Version
https://doi.org/10.1149/2.0021411jes
