Page 18 - Guide to Lithium-ion Battery Solutions

Organic / Inorganic Component Analysis

Comparison of components between new and deteriorated electrolyte solutions Qualitative analysis of solvents and trace additives used in electrolyte solutions

Ion Chromatograph Single Quadrupole GC-MS

HIC-ESP GCMS-QP 2020 NX
™
• Evaluation of products generated by decomposition of • Evaluation of reaction products generated by deterioration
electrolyte • Qualitative analysis of unknown components that cannot be
• Shorten analysis time by utilizing a column switching system identified only by retention time information

Lithium hexafluorophosphate is commonly used as the electrolyte solution. It is hydrolyzed by the trace amount of water The electrolyte solution in a Lithium-ion Battery is composed of organic solvent (mainly carbonate-based), electrolyte and
contained in the electrolyte solution. Fluoride ions generated by this decomposition affect battery performance, so additives. It is important to evaluate the electrolyte solution and the deterioration state of the electrolyte solution due to
analysis of decomposition is important in the quality control process. charging and discharging. GCMS is useful for the analysis of those constituents.

Purpose Samples Purpose Samples

Evaluation of Lithium Hexafluorophosphate Electrolyte Solution Solvents used in electrolyte solution and Electrolyte Solution
Decomposition in Electrolyte Solution (New, deteriorated: accelerated deterioration test) component analysis of additives

Data Data

Chromatogram of Electrolyte Solution (New) Chromatogram of Electrolyte Solution (Degraded Product)

Result Result

A peak was not detected in the new electrolyte solution (New), but only in the deteriorated electrolyte solution (Degraded Dimethyl carbonate, ethyl methyl carbonate, and ethylene carbonate, which are used as solvents, were identified from
Product). library search results. Vinylene carbonate, which was used as an additive, was also identified.

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