1：Experimental Design and Method Selection:

The study uses a roll-to-roll tape casting method for preparing MLCC chips, with two-step sintering (TSS) to achieve low-temperature sintering. X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy, and electrical property measurements are employed to characterize the structure and properties.

2：Sample Selection and Data Sources:

Samples are BTBNT-based MLCC chips with ten dielectric layers, prepared from BaTiO3 and (Bi0.5Na0.5)TiO3 powders doped with Nb2O5 and MnO2. Data are collected from laboratory experiments.

3：5Na5)TiO3 powders doped with Nb2O5 and MnOData are collected from laboratory experiments. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Equipment includes a test coater for tape casting, automated printing and stacking machines, XRD with temperature controller, TEM, Raman spectrometer, impedance analyzer, and ferroelectric tester. Materials include BaTiO3 powder, Bi2O3, Na2CO3, TiO2, Nb2O5, MnO2, solvents, dispersants, binders, plasticizers, and Ag/Pd paste.

4：Experimental Procedures and Operational Workflow:

Powders are prepared by solid-state reaction and sand milling. Slurry is cast into green tapes, electrodes are screen-printed, layers are stacked, and chips are sintered using TSS. Structural and electrical properties are measured at various temperatures.

5：Data Analysis Methods:

XRD and TEM data are analyzed for phase identification and microstructure. Electrical data are analyzed using impedance measurements and polarization-electric field loops to calculate energy storage density and efficiency.