High‐entropy ceramics with excellent energy storage performance via screening sintering aids

High‐entropy perovskite ceramics have garnered widespread attention in the energy storage field due to their diversified composition and superior performance. However, the preparation of high‐performance high‐entropy ceramic materials still faces many challenges due to their complex composition and structure. This work systematically studies the effects of MgO, SiO2, Li2CO3, and MnCO3 on the sintering temperature and energy storage performance of (Na0.2Bi0.2Ba0.2Sr0.2Ca0.2)TiO3 (NBBSCT) high‐entropy ceramics. The introduction of MnCO3 successfully reduced the sintering temperature of the high‐entropy ceramics to 1150°C and achieved a high energy storage efficiency of 95.5% with this composition. The NBBSCT ceramics with 0.5 wt%MgO exhibited a breakdown field of 300 kV/cm and an energy storage density of 3.7 J/cm3. The study indicates that adding appropriate sintering aids can significantly improve the sintering behavior and energy storage performance of high‐entropy ceramics. This method provides new insights into the preparation and performance enhancement of high‐entropy energy storage ceramics.