In situ, real-time Raman microscopy of embedded single particle graphite electrodes

Yu Luo*, Wen Bin Cai, Daniel Alberto Scherson

*この研究の対応する著者

研究成果: Article査読

29 被引用数 (Scopus)

抄録

Dynamic aspects of Li+ intercalation-deintercalation into single KS-44 carbon particles (8-50 μm in diameter) embedded in thermally annealed Ni foils were examined in 1 M LiClO4, ethylene carbonate (EC), diethyl carbonate (DEC) (1:1 v/v) solutions by in situ, time-resolved Raman microscopy. A direct correlation was found between the position of the prominent G band, in the range 1581-1590 cm-1, and the amount of Li+ in KS-44 within the so-called dilute stage 1 phase. This information was used to determine spectroscopically and in real time the average concentration of Li+ within the volume of the particle probed by the laser beam following application of a potential step between 0.05 V vs. Li/Li+, i.e., nominally full Li+ intercalation and 0.7 V vs. Li/Li+, i.e., full Li+ deintercalation. Quantitative analysis of these transient data based on a spherical diffusion model yielded a time constant for Li+ deintercalation for dilute stage 1 phase consistent with reported values of Li+ diffusion coefficients within graphitic materials and the size of the particles probed. Single KS-44 particles cycled repeatedly into the deep Li+-intercalation region recorded at high potentials E > 0.5 V vs. Li/Li+, displayed a new Raman band attributed to bounding graphite layers not observed for pristine KS-44 carbon under otherwise identical conditions. This new spectral feature has been tentatively associated with chemical modifications of the carbon itself which may be at least partially responsible for irreversible capacity losses.

本文言語English
ジャーナルJournal of the Electrochemical Society
149
8
DOI
出版ステータスPublished - 2002 8月 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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