Electrocaloric (EC) refrigeration, is accepted as an auspicious method to develop eco-friendly cooling devices. Here, the investigations on the EC response and energy storage performance of heterovalent-doped Ba(Sn, Ti)O₃ relaxor ferroelectrics are carried out. Doping of aliovalent Mn or Nb elements into Ti site would regulate both the EC and energy storage behaviors. An enhanced EC temperature change up to 1.31 K, and a maximal recoverable energy storage density of 0.24 J cm^− 3 with the efficiency as high as 87.11 %, can be observed under 70 kV cm^− 1 in 0.5 % acceptor-doped Ba(Sn, Ti)O₃ ceramics. It is found that the local internal stress, the local charge fluctuation, and the oxygen deficiencies would benefit the electrical behaviors of this system. These results would shed light on the effect of the heterovalent substitution on the electrical properties of lead-free BaTiO₃ system and provide a novel and simple route to further improve the EC response and energy storage performance.

电热 (EC) 制冷被认为是开发环保冷却设备的一种吉祥方法。在此，对异价掺杂的 Ba(Sn, Ti)O ₃弛豫铁电体的 EC 响应和储能性能进行了研究。将异价 Mn 或 Nb 元素掺杂到 Ti 位点将调节 EC 和储能行为。增强的EC温度变化到1.31 K，和最大可恢复储能0.24Ĵ厘米密度^{- 3}与效率高达87.11％，可以在70千伏厘米可观察到^{- 1}在0.5％受主掺杂的Ba（SN , Ti)O ₃陶瓷。发现局部内应力、局部电荷波动和氧缺乏有利于该系统的电学行为。这些结果将阐明杂价取代对无铅BaTiO ₃体系电性能的影响，并为进一步提高EC响应和储能性能提供了一种新颖而简单的途径。