Defect Structure of Li-Doped BPO4: A Nanostructured Ceramic Electrolyte for Li-Ion Batteries

✍ Scribed by M.J.G. Jak; E.M. Kelder; J. Schoonman

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 259 KB
• Volume: 142
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1998.7987

✦ Synopsis

In this paper the defect chemistry of Li-doped BPO 4 (BPO 4 -xLi 2 O, 04x40.1) is studied. This nanostructured ceramic electrolyte is used in all-solid-state Li-ion batteries. By changing the Li-doping level the influence on the crystal structure is studied and related to the properties of the material. X-ray diffraction, Fourier-transformed infra-red spectroscopy (FT-IR), 31 P, 11 B, and 7 Li magic-angle-spinning solid state nuclear magnetic resonance, neutron diffraction, and inductively coupled plasma optical-emission spectroscopy measurements are used in order to study the structure. The electrical properties are studied with AC-impedance spectroscopy (AC-IS). The experimental data show that the defect structure of Li-doped BPO can be described with two defect models, Li B ؉2Li • i and V B ؉3Li • i , suggesting that the ionic conductivity takes place via interstitial Li ions.