Reasons for capacity fading of LiCoPO 4 cathodes in LiPF 6 containing electrolyte solutions

E. Markevich; R. Sharabi; H. Gottlieb; V. Borgel; K. Fridman; G. Salitra; D. Aurbach; G. Semrau; M. A. Schmidt; N. Schall; C. Bruenig

doi:10.1016/j.elecom.2011.11.014

Reasons for capacity fading of LiCoPO ₄ cathodes in LiPF ₆ containing electrolyte solutions

E. Markevich, R. Sharabi, H. Gottlieb, V. Borgel, K. Fridman, G. Salitra, D. Aurbach, G. Semrau, M. A. Schmidt, N. Schall, C. Bruenig

Department of Chemistry

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141 Scopus citations

Abstract

The reasons for capacity fading of LiCoPO ₄ cathodes in 1 M LiPF ₆ EC/DMC 1:1 electrolyte solutions were investigated using ¹⁹F, ³¹P NMR and XPS spectroscopy. The origin of the poor performance of LiCoPO ₄ cathodes in LiPF ₆ containing electrolyte solutions is a nucleophilic attack of F ^- anions in solution on the P atoms, resulting in the breaking of the P - O bonds of the phosphate anions and the formation of soluble LiPO ₂F ₂ moieties.

Original language	English
Pages (from-to)	22-25
Number of pages	4
Journal	Electrochemistry Communications
Volume	15
Issue number	1
DOIs	https://doi.org/10.1016/j.elecom.2011.11.014
State	Published - Feb 2012

Keywords

Difluorophosphates
F NMR spectroscopy
Lithium batteries
Lithium-cobalt phosphate
Olivines
P NMR spectroscopy

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10.1016/j.elecom.2011.11.014

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title = "Reasons for capacity fading of LiCoPO 4 cathodes in LiPF 6 containing electrolyte solutions",

abstract = "The reasons for capacity fading of LiCoPO 4 cathodes in 1 M LiPF 6 EC/DMC 1:1 electrolyte solutions were investigated using 19F, 31P NMR and XPS spectroscopy. The origin of the poor performance of LiCoPO 4 cathodes in LiPF 6 containing electrolyte solutions is a nucleophilic attack of F - anions in solution on the P atoms, resulting in the breaking of the P - O bonds of the phosphate anions and the formation of soluble LiPO 2F 2 moieties.",

keywords = "Difluorophosphates, F NMR spectroscopy, Lithium batteries, Lithium-cobalt phosphate, Olivines, P NMR spectroscopy",

author = "E. Markevich and R. Sharabi and H. Gottlieb and V. Borgel and K. Fridman and G. Salitra and D. Aurbach and G. Semrau and Schmidt, {M. A.} and N. Schall and C. Bruenig",

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AU - Markevich, E.

AU - Sharabi, R.

AU - Gottlieb, H.

AU - Borgel, V.

AU - Fridman, K.

AU - Salitra, G.

AU - Aurbach, D.

AU - Semrau, G.

AU - Schmidt, M. A.

AU - Schall, N.

AU - Bruenig, C.

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AB - The reasons for capacity fading of LiCoPO 4 cathodes in 1 M LiPF 6 EC/DMC 1:1 electrolyte solutions were investigated using 19F, 31P NMR and XPS spectroscopy. The origin of the poor performance of LiCoPO 4 cathodes in LiPF 6 containing electrolyte solutions is a nucleophilic attack of F - anions in solution on the P atoms, resulting in the breaking of the P - O bonds of the phosphate anions and the formation of soluble LiPO 2F 2 moieties.

KW - Difluorophosphates

KW - F NMR spectroscopy

KW - Lithium batteries

KW - Lithium-cobalt phosphate

KW - Olivines

KW - P NMR spectroscopy

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Reasons for capacity fading of LiCoPO ₄ cathodes in LiPF ₆ containing electrolyte solutions

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