Effect of isotropic and anisotropic porous microstructure on electrochemical performance of Li ion battery cathodes: An experimental and computational study

Azami-Ghadkolai, Milad; Yousefi, Mehrdad; Allu, Srikanth; Creager, Stephen; Bordia, Rajendra

doi:10.1016/j.jpowsour.2020.228490

Title: Effect of isotropic and anisotropic porous microstructure on electrochemical performance of Li ion battery cathodes: An experimental and computational study

Journal Article · Fri Jul 31 00:00:00 EDT 2020 · Journal of Power Sources

DOI:https://doi.org/10.1016/j.jpowsour.2020.228490· OSTI ID:1648956

Azami-Ghadkolai, Milad ^[1]; Yousefi, Mehrdad ^[1];

^[2]; Creager, Stephen ^[1]; Bordia, Rajendra ^[1]

Clemson Univ., SC (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Liquid electrolyte mass transport is a major limitation affecting high-power Li ion batteries. Fast discharging causes Li salt depletion in the current collector region of the cathode which produces overpotential in the electrolyte and consequently a drop of cell voltage to below the cut-off voltage, especially at higher electrode thickness and discharge rate. In this study, through experiment and simulation, we have investigated the effect of electrode thickness, mass loading, discharge rate and tortuosity on electrolyte mass transport and final derived areal capacity and specific energy for electrodes having isotropic (normal tape casting) and anisotropic (freeze tape casting) porous microstructure. Furthermore, the macroporous channels in freeze tape cast electrodes facilitate Li salt transport and reduce the Li salt mass transport limitations even at high electrode thickness and discharge rates, and high electrode tortuosity. In our results, computer simulations show that freeze tape cast electrodes may be fully discharged up to 750 μm thickness at 1 C rate compared to 300 μm for normal tape cast electrodes with the same mass loading. Freeze tape cast electrodes also show stable maximum areal capacity for C rates about double the maximum C rates of their normal tape cast electrode counterparts with the same mass loading.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; OIA-1655740

OSTI ID:: 1648956

Journal Information:: Journal of Power Sources, Vol. 474, Issue 1; ISSN 0378-7753

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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