Environment-friendly solid-state cooling technology necessitates the search for energy-efficient electrocaloric (EC) materials. In this regard, the EC effect and energy storage performance have been investigated on a site-engineered lead-free Ba_1-x (Bi_0.5Li_0.5) _x TiO₃ (x = 0.0, 0.10, 0.125, 0.15 and 0.175) system from the perspective of its enhanced characteristic parameters. The ferroelectric and dielectric studies reveal the tunable polarization and Curie temperature as a function of composition. The EC measurements on these samples display superior EC parameters compared to the values reported for other polycrystalline ferroelectric systems. The observed EC parameters for the x = 0.10 sample, such as the change in entropy (ΔS), adiabatic temperature change (ΔT) and EC coefficient are 2.63 J kg⁻¹ K, 2.03 K and 0.68 K mm⁻¹ kV, respectively. Notably, the x = 0.15 sample displays near room-temperature (307 K) EC response with ΔT ≥ 0.30 K over a broad 24 K temperature range. In addition, the energy storage performance studies elucidate that the Ba_1-x (Bi_0.5Li_0.5) _x TiO₃ compound with x = 0.175 displays large energy storage efficiency (96.7%) with 144 mJ cm⁻³ as the storage density. The tunable EC characteristics and high energy storage efficiency demonstrated in this work illustrate the application potential of site-engineered BaTiO₃ samples in efficient cooling and storage devices.

环保的固态冷却技术需要寻找节能的电热（EC）材料。在这方面，已经对现场设计的无铅Ba ₁ - _x（Bi _0.5 Li _0.5）_x TiO ₃（x 从其增强的特性参数的角度来看= 0.0、0.10、0.125、0.15和0.175）系统。铁电和介电研究表明，可极化和居里温度是成分的函数。与其他多晶铁电系统报道的值相比，这些样品的EC测量显示出出众的EC参数。对于x = 0.10样品，观察到的EC参数，例如熵的变化（ΔS），绝热温度变化（ΔT）和EC系数为2.63 J kg ^-1 K，2.03 K和0.68 K mm ^-1 kV，分别。值得注意的是，x = 0.15的样品显示出接近室温（307 K）EC响应和ΔT在24 K宽温度范围内≥0.30K。另外，能量存储性能研究阐明了x = 0.175的Ba _{1- x} （Bi _0.5 Li _0.5）_x TiO ₃化合物以144 mJ cm ^-3作为存储密度显示出大的能量存储效率（96.7％）。这项工作中演示的可调节EC特性和高能量存储效率说明了现场设计的BaTiO ₃样品在高效冷却和存储设备中的应用潜力。