DataVXACS Applied Energy MaterialsPaper
journal article·2021-11-22Open access

Thermodynamic Analysis of LiNi0.6Mn0.2Co0.2O2 (NMC622) Voltage Hysteresis Induced through High Voltage Charge

Wenzao Li, Lisa M. Housel, Garrett P. Wheeler, David C. Bock, Kenneth J. Takeuchi, Esther S. Takeuchi, Amy C. Marschilok

ACS Applied Energy Materials· Volume 4· Issue 11
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Source abstract

Abstract

High voltage charge of NMC materials can extend the initial capacity but also impair the long-term cyclability. This investigation probes NMC622 with charge limits of 4.3 and 4.7 V using operando isothermal microcalorimetry. A higher voltage charge to 4.7 V brings ∼17% increase in capacity yet a doubling of the heat dissipated compared to 4.3 V. Additionally, the thermodynamic paths of (dis)charge visualized by enthalpy potential show path-dependent (de)lithiation in the 3.0–4.7 V window. More evidence is provided explaining the long-term energy fading of NMC622 induced by high voltage, including increased thermal energy waste and asymmetric (de)lithiation thermodynamics.
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Research context

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Technologies Research · Advanced Battery Materials and Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794, United States

Institute for Electrochemically Stored Energy, Stony Brook University, Stony Brook, New York 11794, United States

Interdisciplinary Science Department, Brookhaven National Laboratory, Upton, New York 11973, United States

Department of Materials Science and Chemical Engineering, State University of New York at Stony Brook, Stony Brook, New York 11794, United States

Funding

Basic Energy Sciences · William and Jane Knapp Chair for Energy and the Environment

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