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Titre du document / Document title

SEI film formation on highly crystalline graphitic materials in lithium-ion batteries

Auteur(s) / Author(s)

BUQA H. (1) ; WÜRSIG A. (1) ; VETTER J. (1) ; SPAHR M. E. (2) ; KRUMEICH F. (3) ; NOVAK P. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Paul Scherrer Institut, Electrochemistry Laboratory, 5232 Villigen PSI, SUISSE
(2) TIMCAL SA, 6743 Bodio, SUISSE
(3) Swiss Federal Institute of Technology, Laboratory of Inorganic Chemistry, 8093 Zurich, SUISSE

Résumé / Abstract

In situ differential electrochemical mass spectrometry (DEMS) was used to study the SEI film formation on highly crystalline TIMREX® SLX50 graphite negative electrodes during the first electrochemical lithium insertion using either 1 M LiPF6 in ethylene carbonate (EC) with either dimethyl carbonate (DMC) or propylene carbonate (PC) as co-solvent. In the case of the propylene and ethylene carbonate containing electrolyte, DEMS measurements indicate strong formation of ethylene and propylene gas below 0.75 V versus Li/Li+, which does not decrease at lower cell potential and in the subsequent charge/discharge cycles. Whereas for the dimethyl carbonate containing electrolyte, ethylene gas formation could be observed already above 1 V versus Li/Li+. Post mortem scanning electron microscopy (SEM) studies of the electrodes show strong exfoliation of the graphite electrode when they are discharged in the ethylene/propylene carbonate electrolyte, indicating the formation of an unstable SEI layer. The addition of vinylene carbonate (VC) as a film forming additive significantly decreases the gas formation at the graphite electrode in the propylene carbonate containing electrolyte. The exfoliation was suppressed by the vinylene carbonate additive. We show that the combination of different in situ and ex situ methods can provide new useful information about the passivation process of graphite, as well as the solid electrolyte interphase layer formed, during the first electrochemical insertion of lithium into graphite negative electrode materials.

Revue / Journal Title

Journal of power sources    ISSN  0378-7753   CODEN JPSODZ 

Source / Source

Congrès
Meeting of the International Battery Association, Graz , AUTRICHE (18/04/2004)
2006, vol. 153, no 2 (230 p.)  [Document : 6 p.] (28 ref.), [Notes: Selected papers], pp. 385-390 [6 page(s) (article)]

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Amsterdam, PAYS-BAS  (1976) (Revue)

Mots-clés anglais / English Keywords

Crystalline material

;

Mass spectrometry

;

Secondary cell

;

Scanning electron microscopy

;

In situ

;

Additive

;

Graphite

;

Lithium ion

;

Lithium battery

;

Film formation

;

Mots-clés français / French Keywords

Matériau cristallin

;

Spectrométrie masse

;

Accumulateur électrochimique

;

Microscopie électronique balayage

;

In situ

;

Additif

;

Graphite

;

Lithium ion

;

Batterie lithium

;

Formation film

;

Mots-clés espagnols / Spanish Keywords

Material cristalino

;

Espectrometría masa

;

Acumulador electroquímico

;

Microscopía electrónica barrido

;

In situ

;

Aditivo

;

Grafito

;

Litio ión

;

Formación película

;

Mots-clés d'auteur / Author Keywords

Lithium-ion cell

;

Graphite electrode

;

SEI film

;

Additive

;

In situ DEMS

;

Post mortem SEM

;

Localisation / Location

INIST-CNRS, Cote INIST : 17113, 35400015336952.0270

Nº notice refdoc (ud4) : 17609346



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