Decomposition reaction of LiPF6-based electrolytes for lithium ion cells

Tetsuya Kawamura, Shigeto Okada, Jun ichi Yamaki

Research output: Contribution to journalArticle

200 Citations (Scopus)

Abstract

The decomposition of LiPF6 electrolytes with water was studied by measuring the water content after storage. The solvents used were ethylene carbonate (EC) + diethyl carbonate (DEC), EC + dimethyl carbonate (DMC), propylene carbonate (PC) + DEC, and PC + DMC mixed by the volume ratio 1 to 1, respectively. The experimental results were in good agreement with -d[H2O]/dt = k[H2O]2[LiPF6]. We obtained rate constants (k) from this empirical equation, with k increasing in the order of EC + DMC < EC + DEC < PC + DMC < PC + DEC. This order is in inverse proportion to the order of the dielectric constants of these solvents. Nonionized LiPF6 dissociates to PF5 and LiF in organic solvents, and PF5 reacts with water. A solvent with a high dielectric constant increases the ionization of LiPF6, thereby suppressing the reaction with water.

Original languageEnglish
Pages (from-to)547-554
Number of pages8
JournalJournal of Power Sources
Volume156
Issue number2
DOIs
Publication statusPublished - Jun 1 2006

Fingerprint

Lithium
Electrolytes
Carbonates
carbonates
lithium
electrolytes
Ions
Decomposition
decomposition
cells
Water
ions
Permittivity
propylene
Organic solvents
Water content
Propylene
Ionization
Rate constants
Ethylene

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

Decomposition reaction of LiPF6-based electrolytes for lithium ion cells. / Kawamura, Tetsuya; Okada, Shigeto; Yamaki, Jun ichi.

In: Journal of Power Sources, Vol. 156, No. 2, 01.06.2006, p. 547-554.

Research output: Contribution to journalArticle

Kawamura, Tetsuya ; Okada, Shigeto ; Yamaki, Jun ichi. / Decomposition reaction of LiPF6-based electrolytes for lithium ion cells. In: Journal of Power Sources. 2006 ; Vol. 156, No. 2. pp. 547-554.
@article{d2686d68bc9d4be9aff46ac159c78407,
title = "Decomposition reaction of LiPF6-based electrolytes for lithium ion cells",
abstract = "The decomposition of LiPF6 electrolytes with water was studied by measuring the water content after storage. The solvents used were ethylene carbonate (EC) + diethyl carbonate (DEC), EC + dimethyl carbonate (DMC), propylene carbonate (PC) + DEC, and PC + DMC mixed by the volume ratio 1 to 1, respectively. The experimental results were in good agreement with -d[H2O]/dt = k[H2O]2[LiPF6]. We obtained rate constants (k) from this empirical equation, with k increasing in the order of EC + DMC < EC + DEC < PC + DMC < PC + DEC. This order is in inverse proportion to the order of the dielectric constants of these solvents. Nonionized LiPF6 dissociates to PF5 and LiF in organic solvents, and PF5 reacts with water. A solvent with a high dielectric constant increases the ionization of LiPF6, thereby suppressing the reaction with water.",
author = "Tetsuya Kawamura and Shigeto Okada and Yamaki, {Jun ichi}",
year = "2006",
month = "6",
day = "1",
doi = "10.1016/j.jpowsour.2005.05.084",
language = "English",
volume = "156",
pages = "547--554",
journal = "Journal of Power Sources",
issn = "0378-7753",
publisher = "Elsevier",
number = "2",

}

TY - JOUR

T1 - Decomposition reaction of LiPF6-based electrolytes for lithium ion cells

AU - Kawamura, Tetsuya

AU - Okada, Shigeto

AU - Yamaki, Jun ichi

PY - 2006/6/1

Y1 - 2006/6/1

N2 - The decomposition of LiPF6 electrolytes with water was studied by measuring the water content after storage. The solvents used were ethylene carbonate (EC) + diethyl carbonate (DEC), EC + dimethyl carbonate (DMC), propylene carbonate (PC) + DEC, and PC + DMC mixed by the volume ratio 1 to 1, respectively. The experimental results were in good agreement with -d[H2O]/dt = k[H2O]2[LiPF6]. We obtained rate constants (k) from this empirical equation, with k increasing in the order of EC + DMC < EC + DEC < PC + DMC < PC + DEC. This order is in inverse proportion to the order of the dielectric constants of these solvents. Nonionized LiPF6 dissociates to PF5 and LiF in organic solvents, and PF5 reacts with water. A solvent with a high dielectric constant increases the ionization of LiPF6, thereby suppressing the reaction with water.

AB - The decomposition of LiPF6 electrolytes with water was studied by measuring the water content after storage. The solvents used were ethylene carbonate (EC) + diethyl carbonate (DEC), EC + dimethyl carbonate (DMC), propylene carbonate (PC) + DEC, and PC + DMC mixed by the volume ratio 1 to 1, respectively. The experimental results were in good agreement with -d[H2O]/dt = k[H2O]2[LiPF6]. We obtained rate constants (k) from this empirical equation, with k increasing in the order of EC + DMC < EC + DEC < PC + DMC < PC + DEC. This order is in inverse proportion to the order of the dielectric constants of these solvents. Nonionized LiPF6 dissociates to PF5 and LiF in organic solvents, and PF5 reacts with water. A solvent with a high dielectric constant increases the ionization of LiPF6, thereby suppressing the reaction with water.

UR - http://www.scopus.com/inward/record.url?scp=33646853870&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33646853870&partnerID=8YFLogxK

U2 - 10.1016/j.jpowsour.2005.05.084

DO - 10.1016/j.jpowsour.2005.05.084

M3 - Article

AN - SCOPUS:33646853870

VL - 156

SP - 547

EP - 554

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

IS - 2

ER -