Influence of synthesis parameters on the electrical and structural properties of nanostructured BPO4-Li2O

Li-doped BPO4 is a promising ceramic Li+-ion conducting electrolyte for all -solid-state Li-ion batteries. The influence of the synthesis conditions on the structural and electrical properties of nanostructured Li-doped BPO4 w as investigated. The particle size of the material can be changed by varyin g the synthesis parameters. In order to investigate the relation between th e particle size and the Li+-ion conductivity a series of samples was synthe sized for temperatures between 150 and 600 degrees C for 1.3 to 10 h. Two d ifferent synthesis routes were used and the composition, phase(s), Li+-ion conductivity, particle size, and particle morphology have been determined. As a result, single-phase Li-doped BPO4 with a particle size of 30 nm was o btained at a synthesis temperature as low as 150 degrees C ahd synthesis ti me of only 5 h. Furthermore, a smaller particle size results in a higher ti f-ionconductiviry. (C) 1999 Elsevier Science S.A. All rights reserved.