The lithium-ion battery (LIB) electrode represents a complex porous composite, consisting of multiple phases including active material (AM), conductive additive, and polymeric binder. This study proposes a mesoscale model to probe the effects of the cathode composition, e.g., the ratio of active material, conductive additive, and binder content, on the electrochemical properties and performance. The results reveal a complex nonmonotonic behavior in the effective electrical conductivity as the amount of conductive additive is increased. Insufficient electronic conductivity of the electrode limits the cell operation to lower currents. Once sufficient electron conduction (i.e., percolation) is achieved, the rate performance can be a strong function of ion-blockage effect and pore phase transport resistance. Even for the same porosity, different arrangements of the solid phases may lead to notable difference in the cell performance, which highlights the need for accurate microstructural characterization and composite electrode preparation strategies.
Analysis of Long-Range Interaction in Lithium-Ion Battery Electrodes
Manuscript received June 10, 2016; final manuscript received November 7, 2016; published online December 1, 2016. Assoc. Editor: George Nelson.
The United States Government retains, and by accepting the article for publication, the publisher acknowledges that the United States Government retains, a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for United States government purposes.
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Mistry, A., Juarez-Robles, D., Stein, M., Smith, K., and Mukherjee, P. P. (December 1, 2016). "Analysis of Long-Range Interaction in Lithium-Ion Battery Electrodes." ASME. J. Electrochem. En. Conv. Stor. August 2016; 13(3): 031006. https://doi.org/10.1115/1.4035198
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