Gradual Development of Maricite NaMnPO<sub>4</sub> with the Influence of Diol Chain Length on the Polyol Process of Surpassed Sodium Intercalation
V. Priyanka, G. Savithiri, Subadevi Rengapillai, M. Sivakumar
Abstract
Nanomaterials synthesized by the conventional polyol process varying with the effect of chain length on diols produce the desired properties of the material in a controlled way. A challenging maricite NaMnPO4 is still hindering to make it electrochemically active, which entails strenuous efforts in the domain of sodium-ion batteries. This work aims at the preparation of maricite NaMnPO4 triumphing with the influence of diols chain length on the polyol process to make it electrochemically active. Herein, increasing the diol chain length using ethylene glycol, diethylene glycol, and poly(ethylene glycol) (400 and 6000) fosters the formation of pure material in a single step. Formation of the maricite system is evinced by Rietveld refinement analysis, in which the Mn atom accommodates in the 4a site and Na atom accommodates in the 4c site with the space group of Pmnb. The one-dimensional “rod-like” structure of the material favors the intercalation and deintercalation of sodium ions. Molecular structural dynamics of the maricite NaMnPO4 revealed the intramolecular charge transfer validating the electrostatic activity of the system. Moreover, the material is established in the sodium-ion battery as a cathode material, and the results revealed an initial discharge capacity of 102 mAh/g and observed the performance for 182 cycles at 0.1C.