Realizing high comprehensive energy storage performance in lead-free bulk ceramics <i>via</i> designing an unmatched temperature range

Simultaneous achievement of a large <italic>W</italic>_rec of 3.51 J cm⁻³ and a high <italic>η</italic> of 80.1% in 0.86NN–0.14BNH ceramics under 350 kV cm⁻¹, leading to an excellent comprehensive energy storage performance in lead-free bulk ceramics.