Greatly enhanced energy storage density of alkali-free glass-ceramics after dual optimizations by thickness and crystallization temperature

Glass-ceramics show a great application potential in sustainable development, environmental protection, high temperature, high voltage resistance, and so on. Given the breakdown strength has a great contribution to the energy storage density, alkali-free niobate-based glass-ceramics have emerged as a prominent energy storage material. In this study, the 13.64BaCO(3)-13.64SrCO(3)-32.72Nb(2)O(5)-40SiO(2) alkali-free glass-ceramics were optimized in thickness and crystallization temperature. The thinning of thickness improves the breakdown strength. At the same time, the dielectric constant gets a maximum value by adjusting the crystallization temperature. Therefore, an ultra-high theoretical energy storage density of 27.47 J center dot cm(-3) is obtained. In addition, the finite element software simulates the electric field distribution and electric potential evolution during the development of electric branches, which illustrates the role of glass phase in hindering the development of electric branches and partaking the high electric field. Finally, the effective energy storage density obtained by using P-E loops is L1.49 J center dot cm(-3) under 850 kV/cm.

Automated summary

Glass-ceramics have great potential in sustainable development, environmental protection, high temperature, and high voltage resistance. Alkali-free niobate-based glass-ceramics have emerged as prominent energy storage materials. This study optimized the thickness and crystallization temperature of alkali-free glass-ceramics to improve breakdown strength and achieve maximum dielectric constant. An ultra-high theoretical energy storage density of 27.47 J/cm^3 was obtained. Finite element software simulated the electric field distribution and electric potential evolution, demonstrating the role of glass phase in hindering electric branch development. The effective energy storage density obtained through P-E loops was 1.49 J/cm^3 under 850 kV/cm.