Kinetic properties of a Pt/lambda-MnO{sub 2} electrode for the electroinsertion of lithium ions in a aqueous phase

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.2048520· OSTI ID:40303

Kanoh, Hirofumi; Feng, Q; Miyai, Yoshitaka; Ooi, Kenta ^[1]

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1. Shikoku National Industrial Research Inst., Hayashi-cho Takamatsu (Japan)

Kinetic properties of a Pt/{lambda}-MnO{sub 2} electrode for the electrochemical insertion of lithium ions were studied in t aqueous phase by cyclic voltammetry (CV) and potential step chronoamperometry (PSCA). The cyclic voltammogram showed that the electrochemical insertion reaction of lithium ions proceeds in two steps in the potential range between 0.6 and 0.98 V (vs. saturated calomel electrode). The chemical diffusion coefficients of lithium ions in the manganese oxide the authors evaluated from the PSCA data using a finite diffusion model. They were in the range of 6.6 {times} 10{sup {minus}11} to 1.4 {times} 10{sup {minus}10} cm{sup 2}/s, depending slightly on the applied potential. The activation energy of the diffusion was evaluated as about 44 kJ/mol from the temperature dependence of the PSCA. These results suggested that lithium ions diffuse by a hopping mechanism in the spinel phase. The diffusion coefficients, transfer coefficients, and standard rate constants also were estimated from the CV data. The diffusion coefficients agreed reasonable, well with those obtained by PSCA.

• Sponsoring Organization: USDOE
• OSTI ID: 40303
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 3 Vol. 142; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
40 CHEMISTRY
CHEMICAL REACTION KINETICS
ELECTRIC BATTERIES
ELECTROCHEMISTRY
ELECTRODES
LITHIUM
MANGANESE OXIDES
MASS TRANSFER
PLATINUM
REDOX REACTIONS
VOLTAMETRY