Critical Role of Pressure for Chemo-Mechanical-Induced Stability of Sodium Metal Battery Anodes
Critical Role of Pressure for Chemo-Mechanical-Induced Stability of Sodium Metal Battery Anodes
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DOI：
10.1021/acsenergylett.3c00734
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发表时间：
2023-05
影响因子：
22
通讯作者：
Weimin Jiao;Murtaza Zohair;Janna Eaves-Rathert;J. Ramamurthy;Andrew Harkaway;Rebecca Mort;Jacob Wheaton;Shan Jiang;Steve W. Martin;C. Pint
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文献类型：
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作者：
Weimin Jiao;Murtaza Zohair;Janna Eaves-Rathert;J. Ramamurthy;Andrew Harkaway;Rebecca Mort;Jacob Wheaton;Shan Jiang;Steve W. Martin;C. Pint
在这项工作中，我们表明，电池压力控制的形态和稳定性的电镀钠金属沉积物上的炭黑成核层在醚基电解质。在低于500千帕的压力下，我们观察到的三维Na核伴随着低库仑效率（CE小于98%）的存在下。相反，在500和1272千帕之间的压力下，我们观察到平滑，平面钠沉积，高达99.9%的高CE，和稳定的电化学循环。通过一系列的测试进行在高电流密度和有或没有休息阶段，我们的研究结果阐明了重要的竞争时间尺度的平衡蠕变和形态演变的压力和电荷转移的速度，确定钠形态和稳定性。这突出了在与硬币和袋式电池中的电池包装相关的压力范围内的化学机械效应如何成为钠金属电池设计和操作的关键因素。
In this work we demonstrate that cell pressure controls the morphology and stability of electroplated sodium metal deposits on carbon black nucleation layers in ether-based electrolytes. At pressures below 500 kPa we observe the presence of three-dimensional Na nuclei accompanied by low Coulombic efficiencies (CEs less than 98%). Conversely, at pressures between 500 and 1272 kPa we observe smooth, planar Na deposits, high CEs up to 99.9%, and stable electrochemical cycling. Through a series of tests conducted at elevated current densities and with or without rest stages, our findings elucidate the balance of important competing time scales for creep and morphology evolution under pressure and the rate of charge transfer that determines Na morphology and stability. This highlights how chemo-mechanical effects at pressure ranges relevant for battery packaging in coin and pouch cells are key factors in the design and operation of Na metal batteries.