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Issue 10, 2016
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Transition of lithium growth mechanisms in liquid electrolytes

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Abstract

Next-generation high-energy batteries will require a rechargeable lithium metal anode, but lithium dendrites tend to form during recharging, causing short-circuit risk and capacity loss, by mechanisms that still remain elusive. Here, we visualize lithium growth in a glass capillary cell and demonstrate a change of mechanism from root-growing mossy lithium to tip-growing dendritic lithium at the onset of electrolyte diffusion limitation. In sandwich cells, we further demonstrate that mossy lithium can be blocked by nanoporous ceramic separators, while dendritic lithium can easily penetrate nanopores and short the cell. Our results imply a fundamental design constraint for metal batteries (“Sand's capacity”), which can be increased by using concentrated electrolytes with stiff, permeable, nanoporous separators for improved safety.

Graphical abstract: Transition of lithium growth mechanisms in liquid electrolytes

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Publication details

The article was received on 10 Jun 2016, accepted on 08 Aug 2016 and first published on 01 Sep 2016


Article type: Paper
DOI: 10.1039/C6EE01674J
Energy Environ. Sci., 2016,9, 3221-3229
  • Open access: Creative Commons BY-NC license
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    Transition of lithium growth mechanisms in liquid electrolytes

    P. Bai, J. Li, F. R. Brushett and M. Z. Bazant, Energy Environ. Sci., 2016, 9, 3221
    DOI: 10.1039/C6EE01674J

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