10-16 June 2018
Dalhousie University
America/Halifax timezone
Welcome to the 2018 CAP Congress Program website! / Bienvenue au siteweb du programme du Congrès de l'ACP 2018!

POS-35 Tracking Liquid Electrolyte Changes Throughout Lithium-ion Cell Lifetime

12 Jun 2018, 18:00
1h 30m
SUB McInnes Hall (Dalhousie University)

SUB McInnes Hall

Dalhousie University

Oral (Graduate Student) / Orale (Étudiant(e) du 2e ou 3e cycle) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) DCMMP Poster Session & Finals: Poster Competition and Mingle Session with Industry Partners (28) / Employers | Session d'affiches DPMCM et finales: Concours d'affiches et rencontres avec partenaires industriels et employeurs (28)

Speaker

Ms Lauren Thompson (Dalhousie University Dept. of Chemistry)

Description

Liquid electrolytes are essential to all battery systems, yet little is known of the changes that occur during the lifetime of a cell. It is certain that dramatic changes to the electrolyte of a Li-ion cell occur during operation because sometimes cells opened at the end of life appear “dry” (i.e. no liquid remaining) even though they were filled with substantial liquid electrolyte upon construction. These electrolyte changes contribute strongly to reducing cell lifetime.

This presentation will discuss the changes to the electrolyte composition during Lithium-ion battery cell life. Data from systematically cycled NMC/graphite cells having various electrolyte compositions and tested at various temperatures and voltages will be included. Results from traditional analysis techniques such as Gas Chromatography-Mass Spectrometry (GC-MS), Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) will be presented with emerging analysis techniques such as Fourier-transformed Infrared spectroscopy (FTIR), and Li-ion cell Differential Thermal Analysis (Li-ion DTA). Observations include increased electrolyte degradation reactions at high upper cut-off voltages as well as increased salt (LiPF6) consumption. The results of these studies indicate the situations where electrolyte degradation is most severe and point to methods to mitigate against these problems. These solutions will lead to Li-ion batteries with longer lifetime.

Primary authors

Mr David Hall Prof. Jeff Dahn (Dalhousie University) Ms Lauren Thompson (Dalhousie University Dept. of Chemistry) Ms Leah D. Ellis Mr Michael Bauer Mr Sam Buteau

Presentation Materials

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