Electrochemomechanics of lithium dendrite growth
| Autor: | R. Edwin García, Aniruddha Jana, K.S.N. Vikrant, Sang Inn Woo |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Auxiliary electrode
Materials science Renewable Energy Sustainability and the Environment 020209 energy Diffusion Plastics extrusion chemistry.chemical_element Thermodynamics 02 engineering and technology Plasticity Overpotential 021001 nanoscience & nanotechnology Pollution Dendrite (crystal) Nuclear Energy and Engineering chemistry 0202 electrical engineering electronic engineering information engineering Environmental Chemistry Lithium 0210 nano-technology Current density |
| Zdroj: | Energy & Environmental Science. 12:3595-3607 |
| ISSN: | 1754-5706 1754-5692 |
| Popis: | A comprehensive roadmap describing the current density- and size-dependent dendrite growth mechanisms is presented. Based on a thermodynamically consistent theory, the combined effects of chemical diffusion, electrodeposition, and elastic and plastic deformation kinetics are analyzed to rationalize their contributions to experimentally observable morphologies. A critical current density, i* = ziliml(ΔGΩκi), in the tσ < t < tSand range, results in plastic flow at the tips, dendrite bifurcation, and bent and kinked morphologies. Three dendrite growth mechanisms are observed: (1) electrochemical shielding, where there is practically no electrodeposition/electrodissolution; (2) stress-induced electrodissolution and electrodeposition on those interfaces directly facing each other, generating a self-sustained overpotential that pushes the dendrites towards the counter electrode; and (3) local, lateral plastic extrusion in those side branches experiencing non-hydrostatic stresses. Six regimes of lithium electrodeposit growth are identified: (i) thermodynamic suppression regime, (ii) incubation regime, (iii) base-controlled regime, (iv) tip-controlled regime, (v) mixed regime, and (vi) Sand's regime. |
| Databáze: | OpenAIRE |
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