外延AlN/ScN超晶格的超高储能密度
Ultrahigh energy storage density in epitaxial AlN/ScN superlattices
摘要：
电介质和反铁电材料在高功率储能应用中特别有前途。然而，相对低的能量密度极大地阻碍了它们在存储技术中的使用。在这里，我们报告的第一性原理为基础的计算预测，外延和最初的非极性AlN/ScN超晶格可以实现高达200 J/cm $^{\textrm{3}}$，伴随着理想的效率为100%的能量密度。我们还表明，高的能量密度要求系统既不太接近也不太远离铁电相变下零电场。进一步提出了一个现象学模型来合理化这些惊人的功能。
英文摘要：
Dielectric and antiferroelectric materials are particularly promising for high-power energy-storage applications. However, relatively low energy density greatly hinders their usage in storage technologies. Here, we report first-principles-based calculations predicting that epitaxial and initially non-polar AlN/ScN superlattices can achieve an ultrahigh energy density of up to 200 J/cm$^{\textrm{3}}$, accompanied by an ideal efficiency of 100%. We also show that high energy density requires the system being neither too close nor too far from a ferroelectric phase transition under zero electric field. A phenomenological model is further proposed to rationalize such striking features.
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