リチウム電池用LiPF6電解液の分解反応

Translated title of the contribution: Decomposition reaction of LiPF_6 based electrolytes for lithium ion cells

川村 哲也, 岡田 重人, 山木 準一

Research output: Contribution to journalArticle

Abstract

The decomposition of LiPF$_6$ electrolytes with water was studied by measuring the water content after storage. The solvents used are ethylene carbonate (EC) + diethyl carbonate (DEC), EC + dimethyl carbonate (DMC), propylene carbonate (PC) + DEC and PC + DMC. The experimental results were in good agreement with $-d[{\rm H}_2{\rm O}]/dt = k [{\rm H}_2{\rm O}]^2 [{\rm LiPF}_6]$. We obtained rate constant (k) from this empirical equation and rate constant (k) increased in the order of EC+DMC < EC+DEC < PC+DMC < PC+DEC. This order is inverse proportion to order of dielectric constant of these solvents. Non-ionized LiPF$_6$ dissociates to PF$_5$ and LiF in organic solvents and PF$_5$ reacts with water. High dielectric constant solvent increases the ionization of LiPF$_6$. Therefore, the reaction with water is suppressed in high dielectric constant solvent.
Translated title of the contributionDecomposition reaction of LiPF_6 based electrolytes for lithium ion cells
Original languageJapanese
Pages (from-to)281-288
Number of pages8
Journal九州大学大学院総合理工学報告
Volume24
Issue number3
DOIs
Publication statusPublished - Dec 2002

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