In Situ Raman Microscopy of a Single Graphite Microflake Electrode in a Li +-Containing Electrolyte

Qingfang Shi, Kaoru Dokko, Daniel Alberto Scherson

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Highly detailed Raman spectra from a single KS-44 graphite microflake electrode as a function of the applied potential have been collected in situ using a Raman microscope and a sealed spectroelectrochemical cell isolated from the laboratory environment. Correlations were found between the Raman spectral features and the various Li + intercalation stages while recording in real time Raman spectra during a linear potential scan from 0.7 V down ca. 0.0 V vs Li/Li + at a rate of 0. 1 mV/s in a 1 M LiClO 4 solution in a 1:1 (by volume) ethylene carbonate (EC):diethyl carbonate (DEC) mixture. In particular, clearly defined isosbestic points were observed for data collected in the potential range where the transition between dilute phase 1 and phase 4 of lithiated graphite is known to occur, i.e., 0.174 ≤ E ≤ 0.215 V vs Li/Li +. Statistical analysis of the spectroscopic data within this region made it possible to determine independently the fraction of each of the two phases present as a function of potential without relying on coulometric information and then predict, on the basis of proposed stoichiometry for the transition, a spectrally derived voltammetric feature.

Original languageEnglish
Pages (from-to)4789-4793
Number of pages5
JournalJournal of Physical Chemistry B
Volume108
Issue number15
Publication statusPublished - 2004 Apr 15
Externally publishedYes

Fingerprint

Graphite electrodes
Graphite
Electrolytes
Raman scattering
Microscopy
Carbonates
Microscopic examination
Electrodes
graphite
electrolytes
microscopy
Statistical Data Interpretation
electrodes
Intercalation
Stoichiometry
carbonates
Statistical methods
Ethylene
Microscopes
Raman spectra

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

In Situ Raman Microscopy of a Single Graphite Microflake Electrode in a Li +-Containing Electrolyte. / Shi, Qingfang; Dokko, Kaoru; Scherson, Daniel Alberto.

In: Journal of Physical Chemistry B, Vol. 108, No. 15, 15.04.2004, p. 4789-4793.

Research output: Contribution to journalArticle

Shi, Qingfang ; Dokko, Kaoru ; Scherson, Daniel Alberto. / In Situ Raman Microscopy of a Single Graphite Microflake Electrode in a Li +-Containing Electrolyte. In: Journal of Physical Chemistry B. 2004 ; Vol. 108, No. 15. pp. 4789-4793.
@article{0636abb6f99f4186800916066f97ee2e,
title = "In Situ Raman Microscopy of a Single Graphite Microflake Electrode in a Li +-Containing Electrolyte",
abstract = "Highly detailed Raman spectra from a single KS-44 graphite microflake electrode as a function of the applied potential have been collected in situ using a Raman microscope and a sealed spectroelectrochemical cell isolated from the laboratory environment. Correlations were found between the Raman spectral features and the various Li + intercalation stages while recording in real time Raman spectra during a linear potential scan from 0.7 V down ca. 0.0 V vs Li/Li + at a rate of 0. 1 mV/s in a 1 M LiClO 4 solution in a 1:1 (by volume) ethylene carbonate (EC):diethyl carbonate (DEC) mixture. In particular, clearly defined isosbestic points were observed for data collected in the potential range where the transition between dilute phase 1 and phase 4 of lithiated graphite is known to occur, i.e., 0.174 ≤ E ≤ 0.215 V vs Li/Li +. Statistical analysis of the spectroscopic data within this region made it possible to determine independently the fraction of each of the two phases present as a function of potential without relying on coulometric information and then predict, on the basis of proposed stoichiometry for the transition, a spectrally derived voltammetric feature.",
author = "Qingfang Shi and Kaoru Dokko and Scherson, {Daniel Alberto}",
year = "2004",
month = "4",
day = "15",
language = "English",
volume = "108",
pages = "4789--4793",
journal = "Journal of Physical Chemistry B Materials",
issn = "1520-6106",
publisher = "American Chemical Society",
number = "15",

}

TY - JOUR

T1 - In Situ Raman Microscopy of a Single Graphite Microflake Electrode in a Li +-Containing Electrolyte

AU - Shi, Qingfang

AU - Dokko, Kaoru

AU - Scherson, Daniel Alberto

PY - 2004/4/15

Y1 - 2004/4/15

N2 - Highly detailed Raman spectra from a single KS-44 graphite microflake electrode as a function of the applied potential have been collected in situ using a Raman microscope and a sealed spectroelectrochemical cell isolated from the laboratory environment. Correlations were found between the Raman spectral features and the various Li + intercalation stages while recording in real time Raman spectra during a linear potential scan from 0.7 V down ca. 0.0 V vs Li/Li + at a rate of 0. 1 mV/s in a 1 M LiClO 4 solution in a 1:1 (by volume) ethylene carbonate (EC):diethyl carbonate (DEC) mixture. In particular, clearly defined isosbestic points were observed for data collected in the potential range where the transition between dilute phase 1 and phase 4 of lithiated graphite is known to occur, i.e., 0.174 ≤ E ≤ 0.215 V vs Li/Li +. Statistical analysis of the spectroscopic data within this region made it possible to determine independently the fraction of each of the two phases present as a function of potential without relying on coulometric information and then predict, on the basis of proposed stoichiometry for the transition, a spectrally derived voltammetric feature.

AB - Highly detailed Raman spectra from a single KS-44 graphite microflake electrode as a function of the applied potential have been collected in situ using a Raman microscope and a sealed spectroelectrochemical cell isolated from the laboratory environment. Correlations were found between the Raman spectral features and the various Li + intercalation stages while recording in real time Raman spectra during a linear potential scan from 0.7 V down ca. 0.0 V vs Li/Li + at a rate of 0. 1 mV/s in a 1 M LiClO 4 solution in a 1:1 (by volume) ethylene carbonate (EC):diethyl carbonate (DEC) mixture. In particular, clearly defined isosbestic points were observed for data collected in the potential range where the transition between dilute phase 1 and phase 4 of lithiated graphite is known to occur, i.e., 0.174 ≤ E ≤ 0.215 V vs Li/Li +. Statistical analysis of the spectroscopic data within this region made it possible to determine independently the fraction of each of the two phases present as a function of potential without relying on coulometric information and then predict, on the basis of proposed stoichiometry for the transition, a spectrally derived voltammetric feature.

UR - http://www.scopus.com/inward/record.url?scp=2342628650&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=2342628650&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:2342628650

VL - 108

SP - 4789

EP - 4793

JO - Journal of Physical Chemistry B Materials

JF - Journal of Physical Chemistry B Materials

SN - 1520-6106

IS - 15

ER -