Precursor-based methods for low-temperature synthesis of defectless NaMnPO4 with an olivine- and maricite-type structure

• DOI: 10.1039/c3ce41545g
• Publication Date: 2013-09-24T17:27:43Z
• Authors: Violeta Koleva; Tanya Boyadzhieva; Ekaterina Zhecheva; Diana Nihtianova; Svetlana Simova; Georgi Tyuliev; Radostina Stoyanova
• Keywords: 02 engineering and technology; 0210 nano-technology

We report precursor-based methods for low-temperature synthesis of two structure modifications NaMnPO4. The maricite phase is thermodynamically more stable, while the olivine great interest as a positive-electrode material lithium and sodium ion batteries. advantage synthetic procedures formation defectless NaMnPO4 in temperature range 200–400 °C. morphology characterizations are performed by powder XRD, SEM TEM analyses. oxidation state Mn ions determined X-ray photoelectron spectroscopy. local environment Na both assessed 23Na MAS NMR based on appropriate precursors that easily transformed to target Thermal decomposition freeze-dried phosphate–formate precursor yields with at 400 KMnPO4·H2O dittmarite-type acts structure-template preparation an exchange reaction. Both do not accommodate any anti-site mixing Na,Mn deficiency. consists nano-sized particles (less than 50 nm) closely bound together into aggregates, shape aggregates being dependent procedure used.