In situ visible Raman spectroscopic study of phase change in LiCoO2 film by laser irradiation

Song, Seung‐Wan; Han, Kyoo‐Seung; Fujita, Hachiro; Yoshimura, Masahiro

doi:10.1016/s0009-2614(01)00677-7

Cited by 22 publications

(17 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After annealed at 300 • C for 30 min, two broad peaks at around and 450 and 600 cm −1 are evolved. The presence of this spectra band is characteristic of the layered LiMn 0.5 Ni 0.5 O 2 with a symmetry of R-3m [4,18]. The spectra band at 200-400 cm −1 can be attributed to Mn 3 O 4 [19].…”

Section: Methodsmentioning

confidence: 83%

Electrochemical performance of all-solid-state Li batteries based LiMn0.5Ni0.5O2 cathode and NASICON-type electrolyte

Xie

Imanishi

Zhang

et al. 2010

Journal of Power Sources

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 83%

Electrochemical performance of all-solid-state Li batteries based LiMn0.5Ni0.5O2 cathode and NASICON-type electrolyte

Xie

Imanishi

Zhang

et al. 2010

Journal of Power Sources

View full text Add to dashboard Cite

“…The high-energy excitation lasers used in Raman spectroscopy can substantially change the crystal structure and/or even decompose the sample. For example, Song et al [13] reported significant phase changes in LiCoO 2 /Co samples upon exposure to a laser beam, and laserinduced decomposition of spinel LiMn 2 O 4 has been reported by Paolone and coworkers. [14] In this communication, we explore some of the limitations associated with Raman spectroscopic measurements of FePO 4 -based cathode materials, paying special attention to thermal sensitivity.…”

Section: Introductionmentioning

confidence: 81%

Laser‐induced phase changes in olivine FePO₄: a warning on characterizing LiFePO₄‐based cathodes with Raman spectroscopy

Burba

Palmer

Holinsworth

2008

J Raman Spectroscopy

View full text Add to dashboard Cite

Raman spectroscopy is an excellent technique for probing lithium intercalation reactions of many diverse lithium ion battery electrode materials. The technique is especially useful for probing LiFePO 4 -based cathodes because the intramolecular vibrational modes of the PO 4 3− anions yield intense bands in the Raman spectrum, which are sensitive to the presence of Li + ions. However, the high power lasers typically used in Raman spectroscopy can induce phase transitions in solid-state materials. These phase transitions may appear as changes in the spectroscopic data and could lead to erroneous conclusions concerning the delithiation mechanism of LiFePO 4 . Therefore, we examine the effect of exposing olivine FePO 4 to a range of power settings of a 532-nm laser. Laser power settings higher than 1.3 W/mm 2 are sufficient to destroy the FePO 4 crystal structure and result in the formation of disordered FePO 4 . After the laser is turned off, the amorphous FePO 4 compound crystallizes in the electrochemically inactive α-FePO 4 phase. The present experimental results strongly suggest that the power setting of the excitation laser should be carefully controlled when using Raman spectroscopy to characterize fundamental lithium ion intercalation processes of olivine materials. In addition, Raman spectra of the amorphous intermediate might provide insight into the α-FePO 4 to olivine FePO 4 phase transition that is known to occur at temperatures higher than 450 • C.

show abstract

“…Besides Li x MPO 4 and MPO 4 (M = Fe, Ni, Mn and Co), other electrode materials also demonstrate sensitivity to laser power. Song et al [34] and Fu et al [35] reported significant changes in LiCoO 2 -based samples upon exposure to laser beam, and laser-induced decomposition of spinel LiMn 2 O 4 has been observed by Paolone et al [36] Bai and co-workers recorded the great changes of the vibrational bands of silicon, and the decoupled modes were also detected at high laser powers. [28] Shebanova et al found phase change of Fe 3 O 4 under laser irradiation, and established the correlations between the excitation laser power, the temperature of the sample spot and the degree of oxidation of magnetite.…”

Section: Implication In Raman Measurementmentioning

confidence: 98%

Raman study of pure, C‐coated and Co‐doped LiFePO₄: thermal effect and phase stability upon laser heating

Bai

Yin

Yang

et al. 2011

J Raman Spectroscopy

View full text Add to dashboard Cite

Pure, C-coated and Co-doped LiFePO 4 were prepared by the hydrothermal method. X-ray diffraction patterns showed no impurity phase after carbon coating and Co doping. Thermal effect and phase stability of the three samples as a function of irradiation power density were systematically studied by means of Raman spectroscopy. The correlations between the power density of the excitation laser and the surface structure were accurately established and compared. Results show that the features of highest phase stability, excellent thermal stability and the most sensitive to power density were displayed in the samples of pure, C-coated and Co-doped LiFePO 4 , which were mainly ascribed to the grain size, thermal conductivity and degree of order of the olivine structure, respectively. The results also indicate that particular attention should be paid in characterizing the structure and component of the material surface by Raman spectroscopy, where the thermal effect of laser irradiation will possibly alter material surface and thus induce wrong conclusions.

show abstract

In situ visible Raman spectroscopic study of phase change in LiCoO2 film by laser irradiation

Cited by 22 publications

References 21 publications

Electrochemical performance of all-solid-state Li batteries based LiMn0.5Ni0.5O2 cathode and NASICON-type electrolyte

Electrochemical performance of all-solid-state Li batteries based LiMn0.5Ni0.5O2 cathode and NASICON-type electrolyte

Laser‐induced phase changes in olivine FePO₄: a warning on characterizing LiFePO₄‐based cathodes with Raman spectroscopy

Raman study of pure, C‐coated and Co‐doped LiFePO₄: thermal effect and phase stability upon laser heating

Contact Info

Product

Resources

About

In situ visible Raman spectroscopic study of phase change in LiCoO2 film by laser irradiation

Cited by 22 publications

References 21 publications

Electrochemical performance of all-solid-state Li batteries based LiMn0.5Ni0.5O2 cathode and NASICON-type electrolyte

Electrochemical performance of all-solid-state Li batteries based LiMn0.5Ni0.5O2 cathode and NASICON-type electrolyte

Laser‐induced phase changes in olivine FePO4: a warning on characterizing LiFePO4‐based cathodes with Raman spectroscopy

Raman study of pure, C‐coated and Co‐doped LiFePO4: thermal effect and phase stability upon laser heating

Contact Info

Product

Resources

About

Laser‐induced phase changes in olivine FePO₄: a warning on characterizing LiFePO₄‐based cathodes with Raman spectroscopy

Raman study of pure, C‐coated and Co‐doped LiFePO₄: thermal effect and phase stability upon laser heating