Lithium-ion batteries generally use composite electrodes comprised of solid electroactive material, conductive additives, and polymer binder. Increased electrode thicknesses in general will translate to higher energy density at the cell level because the relative volume fraction of inactive layers such as current collectors, separators, and cell casings will be reduced. When processing composite electrodes, achieving large thicknesses is challenging because the increased drying time results in material dispersion inhomogeneity and in some cases electrode delamination occurs.<br/> <br/>An alternative is to process electrodes comprised of only electroactive materials. In some cases, these electrodes undergo a mild thermal treatment and have been referred to as sintered electrodes. While the ion transport through the electrode microstructure for sintered electrodes has advantages relative to composite electrodes, the great thicknesses still result in transport limitations. In addition, the matrix electronic conductivity must occur through the electroactive material itself, which limits suitable materials for these systems. This talk will discuss considerations when designing sintered electrodes at scales targeted to small form factor batteries, including the relative ion and electron overpotentials in the cells.

Transport considerations for thick sintered electrode small form factor batteries

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