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Article

Heat Generation in NMC622 Coin Cells during Electrochemical Cycling: Separation of Reversible and Irreversible Heat Effects

1
Volkswagen AG, 38239 Salzgitter, Germany
2
Karlsruhe Institute of Technology, Institute for Applied Materials-Applied Materials Physics, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein, Germany
*
Author to whom correspondence should be addressed.
Batteries 2020, 6(4), 55; https://doi.org/10.3390/batteries6040055
Received: 29 June 2020 / Revised: 16 October 2020 / Accepted: 30 October 2020 / Published: 10 November 2020
The thermal behavior of a commercial lithium-ion cell with the cathode material LiNi0.6Mn0.2Co0.2O2 (NMC622) was investigated during the cycling process using a Tian-Calvet calorimeter (C80, SETARAM Instrumentation, France). Various current flows of 42.5, 85, and 170 mA corresponding to charging rates of 0.5, 1, and 2 C, respectively, were applied in the measurements. The corresponding heat flow rates were measured by the C80 calorimeter at 30 °C. The reversible heat effect due to the reversible electrochemical reaction was quantified by the entropy change measurement. The irreversible heat effect due to internal resistances was determined by the electrochemical impedance spectroscopy (EIS) and the galvanostatic intermittent titration technique (GITT). The results were compared with the direct measurement of the heat effect by calorimetry during electrochemical cycling. View Full-Text
Keywords: lithium-ion battery; thermal behavior; heat generation; thermal management; entropy lithium-ion battery; thermal behavior; heat generation; thermal management; entropy
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MDPI and ACS Style

Zhao, W.; Rohde, M.; Mohsin, I.U.; Ziebert, C.; Seifert, H.J. Heat Generation in NMC622 Coin Cells during Electrochemical Cycling: Separation of Reversible and Irreversible Heat Effects. Batteries 2020, 6, 55. https://doi.org/10.3390/batteries6040055

AMA Style

Zhao W, Rohde M, Mohsin IU, Ziebert C, Seifert HJ. Heat Generation in NMC622 Coin Cells during Electrochemical Cycling: Separation of Reversible and Irreversible Heat Effects. Batteries. 2020; 6(4):55. https://doi.org/10.3390/batteries6040055

Chicago/Turabian Style

Zhao, Wenjiao, Magnus Rohde, Ijaz U. Mohsin, Carlos Ziebert, and Hans J. Seifert 2020. "Heat Generation in NMC622 Coin Cells during Electrochemical Cycling: Separation of Reversible and Irreversible Heat Effects" Batteries 6, no. 4: 55. https://doi.org/10.3390/batteries6040055

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