Pressure-Driven and Creep-Enabled Interface Evolution in Sodium Metal Batteries.
Pressure-Driven and Creep-Enabled Interface Evolution in Sodium Metal Batteries.
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DOI：
10.1021/acsami.0c22006
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发表时间：
2021-05
影响因子：
9.5
通讯作者：
Xin Zhang;Q. Wang;Bei Peng;Yichuan Wu
中科院分区：
文献类型：
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作者：
Xin Zhang;Q. Wang;Bei Peng;Yichuan Wu
使用碱金属阳极和固态电解质的全固态电池（assb）由于物理和电气接触不良而面临几个问题。最近的实验表明，施加堆栈压力可以改善界面接触并抑制空洞的形成。由于Na金属的力学性能与Li金属的力学性能不同，导致了压力相关界面演化机制的差异。在此，我们报告了一个三维时间依赖模型，用于跟踪Na金属和Na-β″-氧化铝SE之间形成的界面的演变。我们的研究结果表明，与Li金属相比，Na金属与SE的接触更符合保形，提供更低的界面电阻，假设由于污染而产生的电阻相等。接触弹塑性的差异大于金属蠕变效应的差异。事实上，我们表明，增加的堆压可以导致更低的蠕变，因为接触在高压下更保形。我们与最近的实验结果非常吻合，确定Na- se电池中Na的有效硬度为15 MPa。结果进一步表明，孔隙抑制的压力依赖主要是接触弹塑性。
All-solid-state batteries (ASSBs) using an alkali metal anode and a solid-state electrolyte (SE) face several problems due to poor physical and electrical contact. Recent experiments have shown that applying a stack pressure can improve the interface contact and suppress void formation. The mechanical properties of Na metal are different from those of Li metal, leading to differences in the mechanisms of the pressure-dependent interface evolution. Herein, we report a three-dimensional time-dependent model for tracking the evolution of interfaces formed between Na metal and Na-β″-alumina SE. Our results show that Na metal contacts more conformally with the SE, providing a lower interfacial resistance, compared with Li metal, assuming equal resistance due to contamination. The differences due to contact elastoplasticity are larger than the differences in metal creep effects. In fact, we show that increased stack pressure can lead to lower creep because the contact is more conformal at high pressures. Our excellent agreement with recent experiments determines an effective hardness of Na in the Na-SE batteries to be 15 MPa. The results further reveal that the pressure dependence of void suppression is dominated by contact elastoplasticity.