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Electrochemomechanics of lithium dendrite growth
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2019-11-14 , DOI: 10.1039/c9ee01864f Aniruddha Jana 1, 2, 3, 4 , Sang Inn Woo 1, 2, 3, 4 , K. S. N. Vikrant 1, 2, 3, 4 , R. Edwin García 1, 2, 3, 4
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2019-11-14 , DOI: 10.1039/c9ee01864f Aniruddha Jana 1, 2, 3, 4 , Sang Inn Woo 1, 2, 3, 4 , K. S. N. Vikrant 1, 2, 3, 4 , R. Edwin García 1, 2, 3, 4
Affiliation
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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, î* = z
iliml(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.
中文翻译：
锂枝晶生长的电化学机理
提出了描述当前密度和尺寸依赖性枝晶生长机制的综合路线图。基于热力学一致的理论，分析了化学扩散，电沉积以及弹性和塑性变形动力学的综合影响，以合理化它们对实验可观察形态的贡献。甲临界电流密度，î * = ž我LIM升（Δ GΩκ我），在吨σ <吨<吨砂范围，会导致尖端的塑性流动，枝晶分叉以及弯曲和扭结的形态。观察到三种枝晶生长机制：（1）电化学屏蔽，实际上没有电沉积/电溶解；（2）应力诱导的电溶解和在彼此直接面对的界面上的电沉积，产生自我维持的超电势，将树枝状晶体推向对电极；（3）在那些承受非静水压力的侧支中进行局部，横向塑性挤压。锂电沉积物生长的六种方式被确定：（i）热力学抑制方式，（ii）孵育方式，（iii）碱控制方式，（iv）尖端控制方式，（v）混合方式和（vi）沙氏方式。
更新日期：2019-11-14
iliml(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.
中文翻译：
锂枝晶生长的电化学机理
提出了描述当前密度和尺寸依赖性枝晶生长机制的综合路线图。基于热力学一致的理论，分析了化学扩散，电沉积以及弹性和塑性变形动力学的综合影响，以合理化它们对实验可观察形态的贡献。甲临界电流密度，î * = ž
我LIM升（Δ GΩκ我），在吨σ <吨<吨砂范围，会导致尖端的塑性流动，枝晶分叉以及弯曲和扭结的形态。观察到三种枝晶生长机制：（1）电化学屏蔽，实际上没有电沉积/电溶解；（2）应力诱导的电溶解和在彼此直接面对的界面上的电沉积，产生自我维持的超电势，将树枝状晶体推向对电极；（3）在那些承受非静水压力的侧支中进行局部，横向塑性挤压。锂电沉积物生长的六种方式被确定：（i）热力学抑制方式，（ii）孵育方式，（iii）碱控制方式，（iv）尖端控制方式，（v）混合方式和（vi）沙氏方式。
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