Electrochemical intercalation of lithium into polypyrrole/silver vanadium oxide composite used for lithium primary batteries

Hybrid composites of polypyrrole (PPy) and silver vanadium oxide (SVO) used for lithium primary batteries were chemically synthesized by an xidative polymerization of pyrrole monomer on the SVO surface in an acidic medium. The composite electrode exhibited higher discharge capacity nd better rate capability as compared with the pristine SVO electrode. The improvement in electrochemical performance of the composite electrode as due to PPy which accommodates lithium ions and also enhances the SVO utilization. Chronoamperometric and ac-impedance measurements ndicated that lithium intercalation proceeds under the mixed control by interfacial charge transfer and diffusion. The enhanced SVO utilization in he composite electrode results from a facilitated kinetics of interfacial charge transfer in the presence of PPy. 2006 Elsevier B.V. All rights reserved.