刚性盐混合物形成类软黏土锂超离子导体的决定因素
What dictates soft clay-like Lithium superionic conductor formation from rigid-salts mixture
AI总结：
本文结合深度学习分子动力学模拟与实验，揭示刚性盐混合物经阴离子交换形成分子固体单元及缓慢反应动力学是生成类软黏土锂超离子导体的关键，并据此提出通用制备策略。
摘要：
最近通过混合刚性盐合成了类软黏土的锂超离子导体。通过计算和实验分析，我们阐明了如何从刚性盐混合物中制备出类软黏土材料。利用基于深度学习的原子间势能模型的分子动力学模拟，我们揭示了离子固体混合物形成软黏土的关键微观特征。我们发现，能够在阴离子交换时形成分子固体单元，并且这类反应具有缓慢动力学的盐混合物，是形成软黏土的关键。分子固体单元充当剪切转变区的位点，其固有的柔软性使材料能够在低应力下发生塑性变形。扩展X射线吸收精细结构谱证实了分子固体单元的形成。我们提出了一种从离子固体混合物制备类软黏土材料的通用策略。
英文摘要：
Soft clay-like Li-superionic conductors have been recently synthesized by mixing rigid-salts. Through computational and experimental analysis, we clarify how a soft clay-like material can be created from a mixture of rigid-salts. Using molecular dynamics simulations with a deep learning-based interatomic potential energy model, we uncover the microscopic features responsible for soft clay-formation from ionic solid mixtures. We find that salt mixtures capable of forming molecular solid units on anion exchange, along with the slow kinetics of such reactions, are key to soft-clay formation. Molecular solid units serve as sites for shear transformation zones, and their inherent softness enables plasticity at low stress. Extended X-ray absorption fine structure spectroscopy confirms the formation of molecular solid units. A general strategy for creating soft clay-like materials from ionic solid mixtures is formulated.
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