CUED Publications database

Dendrites as climbing dislocations in ceramic electrolytes: Initiation of growth

Shishvan, SS and Fleck, NA and McMeeking, RM and Deshpande, VS (2020) Dendrites as climbing dislocations in ceramic electrolytes: Initiation of growth. Journal of Power Sources, 456. ISSN 0378-7753

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Abstract

© 2020 Elsevier B.V. We idealise dendrite growth in a ceramic electrolyte by climb of a thick edge dislocation. Growth of the dendrite occurs at constant chemical potential of Li+ at the dendrite tip: the free-energy to fracture and wedge open the electrolyte is provided by the flux of Li+ from the electrolyte into the dendrite tip. This free-energy is dependent on the Li+ overpotential at the dendrite tip and is thereby related to the imposed charging current density. The predicted critical current density agrees with measurements for Li/LLZO/Li symmetric cells: the critical current density decreases with increasing initial length of the dendrite and with increasing electrode/electrolyte interfacial ionic resistance. The simulations also reveal that a void on the cathode/electrolyte interface locally enhances the Li+ overpotential and significantly reduces the critical current density for the initiation of dendrite growth.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 27 Mar 2020 22:16
Last Modified: 03 Sep 2020 03:11
DOI: 10.1016/j.jpowsour.2020.227989