Template synthesis of polypyrrole-coated spinel LiMn{sub 2}O{sub 4} nanotubules and their properties as cathode active materials for lithium batteries
- Osaka Univ., Suita (Japan). Dept. of Applied Chemistry
- Colorado State Univ., Fort Collins, CO (United States). Dept. of Chemistry
Tubules of 200 nm outer diameter spinel LiMn{sub 2}O{sub 4} were prepared by thermal decomposition of an aqueous solution containing lithium nitrate and manganese nitrate at 1:2 molar ratio using a nanoporous alumina membrane as a template. After dissolving the template membrane, the resulting nanotubule array of LiMn{sub 2}O{sub 4} was coated with polypyrrole to investigate the galvanostatic charge-discharge characteristics. The polypyrrole-coated LiMn{sub 2}O{sub 4} tubule electrodes exhibited higher capacities than the polypyrrole-coated LiMn{sub 2}O{sub 4} thin-film electrode prepared under the same conditions, except for the use of the alumina membrane; it was ca. 2.5 times greater at 0.1 mA/cm{sup 2} and became ca. 12 times greater with an increase in current density to 1.0 mA/cm{sup 2}. The observed high capacity of the tubule electrode seems to have resulted from two kinds of effects: a decrease in real current density of high specific surface area at the tubule electrode and a decrease in thickness of LiMn{sub 2}O{sub 4} solid phase for Li{sup +} ions to diffuse through during the charging and discharging reactions.
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- FG03-95ER14576
- OSTI ID:
- 516893
- Journal Information:
- Journal of the Electrochemical Society, Vol. 144, Issue 6; Other Information: PBD: Jun 1997
- Country of Publication:
- United States
- Language:
- English
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