Abstract
Raman spectra of a LiMn2O4 single crystal microelectrode have been recorded in situ as a function of potential in 1 M LiPF6 ethylene carbonate (EC)/dimethyl carbonate (DMC) (1:1) solutions at room temperature. Measurements were acquired during a linear voltammetric scan at 0.1 mV/s over the potential (E) range in which the material undergoes redox transitions, i.e., 3.6 < E < 4.4 V vs Li/Li +. Spectral data were analyzed using both classical least squares (CLS) and multivariate curve resolution (MCR) techniques. A plot of the state of charge of the LiMn2O4 single crystal microelectrode derived from the optical data vs the applied potential obtained from data collected during the reduction of the fully oxidized material displayed two well-defined steps. A similar behavior was found for corresponding plots extracted from a coulometric analysis of the voltammetric scan, except that the curves in this latter case were shifted along the potential axis by ca. 40 mV toward more negative values. This effect was attributed to the slow rates of Li+ diffusion within the lattice, allowing the surface region probed by the laser beam to reach equilibrium with the applied potential much faster than the particle as a whole.
| Original language | English |
|---|---|
| Journal | Electrochemical and Solid-State Letters |
| Volume | 8 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 2005 Oct 7 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Electrochemistry
- Materials Science(all)
Cite this
In situ Raman scattering measurements of a LiMn2O4 single crystal microelectrode. / Shi, Qingfang; Takahashi, Yasuhiko; Akimoto, Junji; Stefan, Ionel C.; Scherson, Daniel Alberto.
In: Electrochemical and Solid-State Letters, Vol. 8, No. 10, 07.10.2005.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - In situ Raman scattering measurements of a LiMn2O4 single crystal microelectrode
AU - Shi, Qingfang
AU - Takahashi, Yasuhiko
AU - Akimoto, Junji
AU - Stefan, Ionel C.
AU - Scherson, Daniel Alberto
PY - 2005/10/7
Y1 - 2005/10/7
N2 - Raman spectra of a LiMn2O4 single crystal microelectrode have been recorded in situ as a function of potential in 1 M LiPF6 ethylene carbonate (EC)/dimethyl carbonate (DMC) (1:1) solutions at room temperature. Measurements were acquired during a linear voltammetric scan at 0.1 mV/s over the potential (E) range in which the material undergoes redox transitions, i.e., 3.6 < E < 4.4 V vs Li/Li +. Spectral data were analyzed using both classical least squares (CLS) and multivariate curve resolution (MCR) techniques. A plot of the state of charge of the LiMn2O4 single crystal microelectrode derived from the optical data vs the applied potential obtained from data collected during the reduction of the fully oxidized material displayed two well-defined steps. A similar behavior was found for corresponding plots extracted from a coulometric analysis of the voltammetric scan, except that the curves in this latter case were shifted along the potential axis by ca. 40 mV toward more negative values. This effect was attributed to the slow rates of Li+ diffusion within the lattice, allowing the surface region probed by the laser beam to reach equilibrium with the applied potential much faster than the particle as a whole.
AB - Raman spectra of a LiMn2O4 single crystal microelectrode have been recorded in situ as a function of potential in 1 M LiPF6 ethylene carbonate (EC)/dimethyl carbonate (DMC) (1:1) solutions at room temperature. Measurements were acquired during a linear voltammetric scan at 0.1 mV/s over the potential (E) range in which the material undergoes redox transitions, i.e., 3.6 < E < 4.4 V vs Li/Li +. Spectral data were analyzed using both classical least squares (CLS) and multivariate curve resolution (MCR) techniques. A plot of the state of charge of the LiMn2O4 single crystal microelectrode derived from the optical data vs the applied potential obtained from data collected during the reduction of the fully oxidized material displayed two well-defined steps. A similar behavior was found for corresponding plots extracted from a coulometric analysis of the voltammetric scan, except that the curves in this latter case were shifted along the potential axis by ca. 40 mV toward more negative values. This effect was attributed to the slow rates of Li+ diffusion within the lattice, allowing the surface region probed by the laser beam to reach equilibrium with the applied potential much faster than the particle as a whole.
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U2 - 10.1149/1.2030507
DO - 10.1149/1.2030507
M3 - Article
AN - SCOPUS:25644455463
VL - 8
JO - Electrochemical and Solid-State Letters
JF - Electrochemical and Solid-State Letters
SN - 1099-0062
IS - 10
ER -