Fabrication and characteristics of a new ceramic solid electrolyte LiMg2P3O10

A single phase of new compound LiMg2P3O10 is obtained by a one-step solid-state reaction. According to Rietveld analysis of XRD patterns, the monoclinic crystal structure of LiMg2P3O10 consists of MgO6 octahedron chain and shared corner PO4 tetrahedron. The chain is constructed in which lithium ions are located in a channel parallel to the b axis. Lithium ions are expected to migrate along the direction of the b axis using bond valence mismatch theory. The total electrical conductivity of dense LiMg2P3O10 ceramic at room temperature is 1.04 x 10(-5) S cm(-1) using an equivalent circuit model. The LiMg2P3O10 ceramics also show a large capacitance of 0.16 mF cm(-2) at a low scan rate of 2 mV s(-1).