Optimize solid‐state synthesis ofP2‐Na_0.67Ni_0.33Mn_0.67O₂cathode materials by using the orthogonal experimental design method

Abstract

Summary The P2‐Na0.67Ni0.33Mn0.67O2 cathode materials were acquired by convenient solid‐state method; the preparation conditions and electrochemical performance of materials were studied in this article. The optimal synthesis parameters are systematically studied via orthogonal experiments. The synthesis conditions, including factors of the excess Na content, calcination temperature, and calcination time, were optimized based on an orthogonal experimental design. Orthogonal experiment shows that the excess Na content has the greatest influence on the discharge capacity of the P2‐Na0.67Ni0.33Mn0.67O2 materials. And the optimal technological parameters are determined as follows: the excess Na content of 3%, the calcining temperature of 900°C, and calcining time of 10 hours. The microstructure of the material was observed by scanning electron microscope (SEM) and transmission electron microscope (TEM), and then, we discussed the influence of different synthesis conditions on the microstructure of the material. Through the study of the electrochemical properties of P2‐Na0.67Ni0.33Mn0.67O2 samples, we know that materials have good initial discharge capacity (159.3 mAh g−1) and excellent rate performance.

Conversion of waste PET into triazines-incorporated polyols and flame-retardant polyurethane foams

“…Table 4 shows the groups of variable factors with corresponding levels and obtained results, including the acid number, hydroxyl value, and viscosity of the synthesized polyols. The principle and orthogonal array can also be found in the literature [27,28]. Figure 2 shows the average values (k Xm ) of the obtained results for each level of the four factors.…”

Recent progress in high-voltage P2-NaxTMO2 materials and their future perspectives

“…4a). 75 For P2-Na 0.67 Ni 0.33 Mn 0.67 O 2 , Yang's group systematically studied the optimal synthesis parameters via orthogonal experiments, 77 and reported that an excess Na content (3%) is able to effectively improve the capacity (159.3 mA h g −1 ). Another research study found that the cut-off voltage (up to 4.5 V or low to 1.5 V) could inuence the P2−O2 transition and Mn 4+ / Mn 3+ redox reaction.…”