Dendrite-Suppressed Lithium Plating from a Carbonate-Based Liquid Electrolyte

Wednesday, 4 October 2017: 10:30
Maryland C (Gaylord National Resort and Convention Center)
K. Park and J. B. Goodenough (The University of Texas at Austin)
Lithium metal is an ultimate anode material to achieve the highest energy density for a given cathode by providing a higher cell voltage and capacity. However, lithium is not used as the anode in commercial lithium-ion batteries because electrochemical dendrite formation and growth during charge can induce a cell short-circuit and the corresponding safety hazards. Plating of lithium through a bed of solid electrolyte particles is shown to transform dendrite growth into a three-dimensional lithium network formed by wetting the particle surfaces in the presence of a carbonate-based liquid electrolyte. It was also found that not every solid electrolyte could be wet by lithium in our systematic investigation.

Upon wetting by lithium metal, a higher overpotential during Li deposition than that with dendrite growth was observed in galvanostatic charge/discharge tests. The characteristic overpotential increase could be correlated with the morphological changes and a more isotropic growth behavior. The origin of the bonding responsible for wetting of the solid-electrolyte particles by lithium will be discussed.