Electrochemical Li insertion into conductive polymer/V{sub 2}O{sub 5} nanocomposites
- Univ. of Waterloo, Ontario (Canada). Dept. of Chemistry
Electrochemical insertion of Li into a series of nanocomposites comprised of alternating V{sub 2}O{sub 5} sheets and conductive polymer layers [polypyrrole (PPY) and polyaniline (PANI)] was examined and compared to the pristine V{sub 2}O{sub 5} material in terms of reversibility, Li site occupancy, and Li diffusion coefficients, and to the materials after oxidation treatment. The electrochemical characteristics are very sensitive to the nature of the polymer, its content, and location. The presence of surface polymer hinders Li insertion in these materials (by comparison to materials without surface polymer) and appears to result in the partial entrapment of Li ions. For modified [PANI]{sub 0.4}V{sub 2}O{sub 5}, polymer incorporation results in better reversibility and increased Li capacity in the nanocomposite. [PPY]{sub 0.40}V{sub 2}O{sub 5} displays a greater first discharge capacity than the respective PANI material, but is not as cyclable as in O{sub 2}-[PANI]{sub 0.40}V{sub 2}O{sub 5}. O{sub 2}-treatment results in the reformation of a high-potential Li site that is lost during the reductive intercalative polymerization. Li chemical diffusion coefficients are greater for the O{sub 2}-[PANI]V{sub 2}O{sub 5} nanocomposite than the xerogel by one order of magnitude, resulting in better performance at high current densities. Most important, the electrochemical response of these nanocomposites is greater than the sum of the two components (inorganic and organic), underlining the synergy of these hybrid materials.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 564107
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 11 Vol. 144; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
Similar Records
Synthesis and electrically conductive polymer/inorganic composites: In situ oxidative polymerization/intercalation of conducting polymers in layered hosts
Tuning the Kinetics of Zinc-Ion Insertion/Extraction in V2O5 by In Situ Polyaniline Intercalation Enables Improved Aqueous Zinc-Ion Storage Performance