In the present study, SnO₂-modified Bi_0.5(Na_0.8K_0.2)_0.5TiO₃ (BNKT) ceramics were fabricated by the conventional solid-state reaction. In order to adjust its sintering behavior and energy storage properties of BNKT ceramics, SnO₂ doping contents varied at 0.0 ÷ 0.04 M. A suitable amount of SnO₂ improved the dielectric properties, affected the relaxor behavior, reduced the energy loss, and also optimized the energy storage performance of BNKT ceramics. Especially, the optimized synthesis procedure for SnO₂-modified Bi_0.5(Na_0.8K_0.2)_0.5TiO₃ ceramics resulted in enhanced the energy storage density of 300% and the energy storage efficiency of 59.1%, respectively. The results suggest that lead-free SnO₂-modified Bi_0.5(Na_0.8K_0.2)_0.5TiO₃ ceramics should be good candidates for energy storage applications in the future.

在本研究中，通过常规的固态反应制备了SnO ₂改性的Bi _0.5（Na _0.8 K _0.2）_0.5 TiO ₃（BNKT）陶瓷。为了调整BNKT陶瓷的烧结性能和储能性能，SnO _2的掺杂量在0.0÷0.04 M范围内变化。适量的SnO ₂改善了介电性能，影响了弛豫性能，减少了能量损失，并进行了优化BNKT陶瓷的储能性能。特别是SnO ₂修饰的Bi _0.5（Na _0.8 K _0.2）的优化合成工艺_0.5 TiO ₃陶瓷的储能密度分别提高了300％和59.1％。结果表明，无铅SnO ₂改性的Bi _0.5（Na _0.8 K _0.2）_0.5 TiO ₃陶瓷应成为将来储能应用的良好选择。