Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 157, Issue 12, Pages A1328-A1334Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3495992
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Funding
- Institute for Advanced Computing Applications and Technologies
- National Science Foundation [CBET-0828002, CBET-0828123, CBET-1008692]
- International Center for Advanced Renewable Energy and Sustainability at Washington University in St. Louis (ICARES)
- U.S. government
- Directorate For Engineering [1008692] Funding Source: National Science Foundation
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This paper considers the design of spatially varying porosity profiles in next-generation electrodes based on simultaneous optimization of a porous-electrode model. Model-based optimal design (not including the solid-phase intercalation mechanism) is applied to a porous positive electrode made of lithium cobalt oxide, which is commonly used in lithium-ion batteries for various applications. For a fixed amount of active material, optimal grading of the porosity across the electrode was found to decrease the ohmic resistance by 15%-33%, which in turn increases the electrode capacity to hold and deliver energy. The optimal porosity grading was predicted to have 40% lower variation in the ohmic resistance to variations in model parameters due to manufacturing imprecision or capacity fade. The results suggest that the potential for the simultaneous model-based design of electrode material properties that employ more detailed physics-based first-principles electrochemical engineering models to determine optimal design values for manufacture and experimental evaluation. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3495992] All rights reserved.
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