Page 17 - Guide to Lithium-ion Battery Solutions

Organic / Inorganic Component Analysis

Evaluation of electrolyte solution in an inert atmosphere Purpose

Spectrum comparison in the presence and
absence of LiPF 6
Fourier Transform Infrared Spectrophotometer

IRSpirit ™ Samples

• Raw material confirmation, foreign matter screening analysis EC + DEC (3: 7) Electrolyte Solution
• Small design allows it to be used in glove boxes and draft (Containing 1M LiPF )
chambers 6
EC + DEC (3: 7) Electrolyte Solution
(Not containing 1M LiPF )
6
1M LiPF 6 : Lithium Hexafluorophosphate
*Since IRSpirit can be controlled wirelessly, a sample can be measured while the
EC : Ethylene Carbonate
FTIR unit is installed in a glove box (custom order required).
It is desirable to handle and characterize the cell components under an atmosphere not affected by water vapor or DEC : Diethyl Carbonate
oxygen. The IRSpirit, a compact FTIR, can be installed in a glove box, thus enabling the evaluation of cell components in a
high-purity argon atmosphere with low dew point and low oxygen concentration.
Data

Purpose Samples

Comparison of spectra under argon and air EC+DEC (3 : 7) Electrolyte Solution
atmospheres Containing 1M LiPF 6
1M LiPF 6 : Lithium Hexafluorophosphate
EC : Ethylene Carbonate
DEC : Diethyl Carbonate
Data

Infrared Spectra of EC+DEC (3 : 7) Electrolyte Solution Containing Difference Spectrum between EC+DEC (3 : 7) Electrolyte Solution
1M LiPF 6 (red) and EC+DEC (3 : 7) Solution (black) Containing 1M LiPF 6 and EC+DEC (3 : 7) Solution

Result

The red and black arrows on the left are characteristic absorptions of each component. To clarify the difference between
the two spectra, the red line minus the black line is shown on the right.
Infrared Spectra of EC+DEC (3 : 7) Electrolyte Solution Containing 1M LiPF 6 -1
In the frequency range of 700 ~ 1000 cm , characteristic vibrational modes in which EC or DEC and lithium ions are
solvated are observed. Therefore, it can be assumed that the four absorption lines shown in the right figure are
Result characteristic absorption lines in which EC or DEC and lithium ions are solvated.

The data shown above was provided by Associate Professor Takashi Ito at Frontier Research Institute for Interdisciplinary
Although the optical properties of argon and air are very different, the left image shows that the infrared spectra
acquired under both atmospheres were almost identical, appearing to be unaffected by the difference in atmosphere. Sciences, Tohoku University. We would like to take this opportunity to express our sincere gratitude. Please also see the
Note that in the right image, the broad absorption of symmetric and antisymmetric OH-stretching vibrations from water article in FTIR TALK LETTER Vol. 35.
-1
molecules were observed between 3400 and 3700 cm in the air atmosphere. Meanwhile, the influence was negligible in
the infrared spectrum in the argon atmosphere.

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