Determining parasitic reaction enthalpies in lithium-ion cells using isothermal microcalorimetry

S. L. Glazier; S. A. Odom; A. P. Kaur; J. R. Dahn

doi:10.1149/2.0761814jes

Determining parasitic reaction enthalpies in lithium-ion cells using isothermal microcalorimetry

S. L. Glazier, S. A. Odom, A. P. Kaur, J. R. Dahn

Chemistry

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

Typical measurements of parasitic heat flow in lithium-ion cells can determine the magnitude of heat flow but cannot differentiate between different types of reactions. This causes difficulty when comparing cells that contain different coatings and solvent systems, which may affect parasitic reaction pathways. In this work, a new technique to measure the rate and net enthalpy change (△H) of parasitic reactions in lithium ion cells is introduced. Isothermal microcalorimetry and precision current measurements are used to make in-situ, non-destructive measurements of heat flow and parasitic current during high-voltage holds. The results are used to determine △H of parasitic processes in NMC532/graphite pouch cells. Effects of positive electrode coating, solvent, and upper cutoff voltage are explored. Solvent systems of organic carbonates with and without methyl acetate, and fluorinated carbonates are also investigated. Each solvent system yielded a unique trend of △H with increased voltage, and results were consistent between pair cells. Cells with organic carbonates showed consistent △H between voltages, while cells containing methyl acetate showed decreasing H. Cells containing fluorinated carbonates showed increasing △H with increased voltage. The observed trends in △H and solvent systems as well as future developments of this method are discussed.

Original language	English
Pages (from-to)	A3449-A3458
Journal	Journal of the Electrochemical Society
Volume	165
Issue number	14
DOIs	https://doi.org/10.1149/2.0761814jes
State	Published - 2018

Bibliographical note

Funding Information:
The authors thank NSERC and Tesla Canada for funding this work under the auspices of the Industrial Chairs program. SAO and APK thank the NSF (award CHE-1300653) for financial support. SLG thanks the NSERC PGS-D program and the Walter C. Sumner foundation for support. The authors thank Dr. Jing Li formerly at BASF and Dr. Deijun Xiong at Shenzhen CapChem for providing some of the electrolyte components used in this work. The authors thank Dr. Chris Burns of Novonix for providing the Novonix charger for high-precision voltage-hold testing. Lastly, we thank Dr. Jian Tu of LiFUN for providing expertise in cell assembly.

Publisher Copyright:
© The Author(s) 2018. Published by ECS.

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1149/2.0761814jes

Cite this

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title = "Determining parasitic reaction enthalpies in lithium-ion cells using isothermal microcalorimetry",

abstract = "Typical measurements of parasitic heat flow in lithium-ion cells can determine the magnitude of heat flow but cannot differentiate between different types of reactions. This causes difficulty when comparing cells that contain different coatings and solvent systems, which may affect parasitic reaction pathways. In this work, a new technique to measure the rate and net enthalpy change (△H) of parasitic reactions in lithium ion cells is introduced. Isothermal microcalorimetry and precision current measurements are used to make in-situ, non-destructive measurements of heat flow and parasitic current during high-voltage holds. The results are used to determine △H of parasitic processes in NMC532/graphite pouch cells. Effects of positive electrode coating, solvent, and upper cutoff voltage are explored. Solvent systems of organic carbonates with and without methyl acetate, and fluorinated carbonates are also investigated. Each solvent system yielded a unique trend of △H with increased voltage, and results were consistent between pair cells. Cells with organic carbonates showed consistent △H between voltages, while cells containing methyl acetate showed decreasing H. Cells containing fluorinated carbonates showed increasing △H with increased voltage. The observed trends in △H and solvent systems as well as future developments of this method are discussed.",

author = "Glazier, {S. L.} and Odom, {S. A.} and Kaur, {A. P.} and Dahn, {J. R.}",

note = "Funding Information: The authors thank NSERC and Tesla Canada for funding this work under the auspices of the Industrial Chairs program. SAO and APK thank the NSF (award CHE-1300653) for financial support. SLG thanks the NSERC PGS-D program and the Walter C. Sumner foundation for support. The authors thank Dr. Jing Li formerly at BASF and Dr. Deijun Xiong at Shenzhen CapChem for providing some of the electrolyte components used in this work. The authors thank Dr. Chris Burns of Novonix for providing the Novonix charger for high-precision voltage-hold testing. Lastly, we thank Dr. Jian Tu of LiFUN for providing expertise in cell assembly. Publisher Copyright: {\textcopyright} The Author(s) 2018. Published by ECS.",

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AU - Dahn, J. R.

N1 - Funding Information: The authors thank NSERC and Tesla Canada for funding this work under the auspices of the Industrial Chairs program. SAO and APK thank the NSF (award CHE-1300653) for financial support. SLG thanks the NSERC PGS-D program and the Walter C. Sumner foundation for support. The authors thank Dr. Jing Li formerly at BASF and Dr. Deijun Xiong at Shenzhen CapChem for providing some of the electrolyte components used in this work. The authors thank Dr. Chris Burns of Novonix for providing the Novonix charger for high-precision voltage-hold testing. Lastly, we thank Dr. Jian Tu of LiFUN for providing expertise in cell assembly. Publisher Copyright: © The Author(s) 2018. Published by ECS.

PY - 2018

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Determining parasitic reaction enthalpies in lithium-ion cells using isothermal microcalorimetry

Abstract

Bibliographical note

ASJC Scopus subject areas

UN SDGs

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