## Results and Discussion  
Formation of the LBNO\({}_{nc}\) Functional Layer on the Porous LNFO\({}_{ss}\) and LNFO\({}_{p}\) Cathode Substrates by the EPD Method  
The optimal modes of deposition of the LBNO\({}_{\mathrm{nc}}\) film from the suspension of micropowder with a concentration of 10 g/L in isopropanol with the addition of iodine (0.4 g/L) were determined by the test deposition on a Ni-foil. For deposition of the green LBNO\({}_{\mathrm{nc}}\) coatings with a thickness of approximately 10 \(\upmu\)m, the deposition voltage varied from 20 to 100 V and the deposition time from 1 to 5 min. Other criteria for choosing the deposition mode were the deposition weight, film uniformity, and the absence of cracks on the film surface. Current-voltage characteristics (CVC) obtained during the test deposition and the dependence of the current strength on time at the voltage value of 100 V are presented in Figure 1. The current strength linearly depends on the voltage in the range of measurements (12-150 V) i.e., the EPD cell resistance does not depend on the voltage in this range (Figure 1a). In the study of this suspension, nonlinearity and hysteresis of the I-V characteristics were not found. The linear character of the I-V characteristics corresponds to the constant electrophoretic mobility of particles in the suspension.  
When conducting the test deposition at a constant voltage, the current strength in the time interval from 0 to 15 min is characterized by chaotic fluctuations (approximately within 10% of the average value) with a general growth trend (Figure 1b). It is likely that the processes of increasing the resistance of the deposited film and depletion of the suspension do not have a significant effect on the kinetics of the current change during the EPD process, which may be due to the effect of ionic charge transfer in the suspension with the participation of free protons under the influence of an external electric field [31; 32].  
It is worth noting that deposition from the LBNO\({}_{\mathrm{nc}}\) suspension without iodine did not occur. The addition of iodine leads to the additional generation of protons in the suspension due to its reaction with acetylacetone, which changes the charge state of the particles and the conductivity of the suspension [29]. According to the experimental data obtained on a Ni-foil, to form a layer with a thickness of 10 \(\upmu\)m, it is necessary that the weight of the deposited film is about 8-10 mg/cm\({}^{2}\) with  
Figure 1: The current–voltage characteristic in the voltage range from 12 to 150 V (**a**) and the dependence of the current strength on time at a constant voltage of 100 V (**b**) obtained during the test EPD on the Ni-foil from a suspension of the LBNO\({}_{\mathrm{nc}}\) powder (10 g/L) in isopropanol with J\({}_{2}\) additive (0.4 g/L).  
respect to the geometric surface of the electrode, which is realized in the case of a constant voltage of 100 V and a deposition time of 2 min. EPD of the LBNO\({}_{\text{nc}}\) electrode material on porous substrates of LNFO\({}_{\text{p}}\) and LNFO\({}_{\text{ss}}\) was performed in one step at a constant voltage of 100 V and a deposition time of 2 min, while the current strength was 6.92 and 6.00 mA, respectively. After deposition, the LBNO\({}_{\text{nc}}\) coatings were dried in a Petri dish. The weight of green dried LBNO\({}_{\text{nc}}\) coatings at the LNFO\({}_{\text{p}}\) and LNFO\({}_{\text{ss}}\) cathode substrates was 8.1 and 3.5 mg/cm\({}^{2}\), respectively. The deposition weight of the film obtained on the LNFO\({}_{\text{p}}\) substrate is in good agreement with that obtained in the test deposition. A decrease in the weight of the green dried coatings in the case of LNFO\({}_{\text{ss}}\) may be caused by its lower conductivity due to higher porosity [24]. After drying, the functional LBNO\({}_{\text{nc}}\) layers deposited on the LNFO\({}_{\text{p}}\) and LNFO\({}_{\text{ss}}\) cathode substrates were sintered at 1350 \({}^{\circ}\)C, 1 h. The rate of heating and cooling was 1 \({}^{\circ}\)C/min.