Electrochemical Healing of Dendrites in Garnet-Based Solid Electrolytes,ACS Energy Letters

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Electrochemical Healing of Dendrites in Garnet-Based Solid Electrolytes
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-10-08 , DOI: 10.1021/acsenergylett.0c01896
Anand Parejiya _{1,

2} , Ruhul Amin ₁ , Rachid Essehli ₁ , David L. Wood _{1,

2} , Ilias Belharouak _{1,

2}

Affiliation

Garnet oxides are a promising material family for solid-state batteries (SSBs). Dendrite formation in solid electrolytes critically limits the applicability of SSBs because of limiting Coulombic efficiency and power capability. Herein, the authors report operando electrochemical healing of dendrites in a garnet-based solid electrolyte (SE). Dendrites were deliberately formed at high operational current density (2 mA cm^–2) beyond the critical current density (0.55 mA cm^–2) of the used garnet SE. Electrochemical impedance spectroscopy and scanning electron microscopy were used to confirm dendrite growth in the SE. Dendrites were subsequently healed electrochemically via plating and stripping at 20 and 1 μA cm^–2 current densities. Removal of dendrites was shown by an increase in bulk and interfacial resistance and a progressive increase in polarization during galvanostatic plating and stripping. High local current density at the dendrite tips was identified as the mechanism for preferentially removing dendrites electrochemically. The dendrite detection and healing methods discussed here are crucial for extending the life of SSBs.

中文翻译：

石榴石型固体电解质中枝晶的电化学修复

石榴石氧化物是固态电池（SSB）的有前途的材料系列。由于限制库仑效率和功率能力，固体电解质中枝晶的形成严重限制了SSB的适用性。在本文中，作者报告了石榴石型固体电解质（SE）中枝晶的操作性电化学修复。故意在超过所用石榴石SE的临界电流密度（0.55 mA cm ^-2）的高工作电流密度（2 mA cm ^-2）下形成枝晶。电化学阻抗谱和扫描电子显微镜用于确认SE中枝晶的生长。随后通过电镀和剥离以20和1μAcm ^–2的电化学方式修复枝晶。当前的密度。在恒电流电镀和剥离过程中，体积和界面电阻的增加以及极化的逐渐增加表明，树突的去除。在枝晶尖端的高局部电流密度被确定为优先通过电化学去除枝晶的机制。此处讨论的枝晶检测和修复方法对于延长SSB的寿命至关重要。

更新日期：2020-11-13

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