A Consideration of the Morphology of Electrochemically Deposited Lithium

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  • リチウムの電析形態に関する考察
  • リチウム ノ デンセキ ケイタイ ニ カンスル コウサツ

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Lithium rechargeable cells with lithium metal anodes are widely considered to have the highest energy density among comparable cells. However the cycle life and thermal stability of these cells must be improved The poor performance of lithium metal cells is mainly explained by lithium dendrite growth. With a view to overcoming this problem, the lithium deposition mechanism was considered. It is suggested that lithium dendrites may be called whiskers. Because their tip morphology remains unchanged during their growth, they grow from the base in the same way as whiskers of tin from thin films under stress. The deposited lithium under the protective film will be stressed by non-uniform deposition. To release the stress, the protective film will be broken. To support my assumption, the possible morphology of the lithium was calculated with the boundary condition that pressure induced by the surface tension is the same throughout the lithium surface. The calculation indicated three types of shape depending on the value of the surface tension and internal pressure. It was possible that the surface tension may act to maintainthe size of the hole in the film during whisker extrusion based on assuming that the whisker has higher creep strength than bulk lithium.

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