287368 Aqueous Based Cathode Slurries for Use in Three-Dimensional Lithium-Ion Batteries

Wednesday, October 31, 2012: 2:09 PM
Cambria East (Westin )
Derek C. Johnson1, Matthew T. Rawls1 and Amy L. Prieto2, (1)Prieto Battery, Inc., Fort Collins, CO, (2)Department of Chemistry, Colorado State University, Fort Collins, CO

Aqueous Based Cathode Slurries For Use in Three-Dimensional Lithium-ion Batteries

Derek C. Johnson, Matthew T. Rawls, and Amy L. Prieto

Chemistry Department, Colorado State University

Prieto Battery, Inc., Fort Collins, CO

                Traditional two-dimensional planar based lithium-ion batteries have the inherent trade-off between energy and power density.  If one is designing a high power density cell, the electrode thickness is typically reduced resulting in a decrease in energy density.  Conversely, if the cell is designed for high energy density, power density is diminished because of an increase in lithium-ion diffusion length as a result of an increase in electrode thickness.  The use of a three-dimensional (3D) architecture is intriguing because it allows a significant decoupling of energy and power density.  This is accomplished because 3D architectures allow the utilization of a third dimension without inducing damage or instability into the electrodes.  Additionally, a 3D architecture calls for the interdigitation of the negative and positive electrodes thereby reducing the lithium-ion diffusion length by a factor of 10-100.  While the use of 3D battery architectures promises a significant leap forward in terms of performance, many technical challenges must be overcome in order to fabricate a functional cell.  Our work is focused on using electrodeposition to synthesize 3D anode structures to which a conformal solid-state electrolyte coating is deposited.  A significant challenge we have faced is the incorporation of a nanoparticle cathode slurry into the 3D structure without damaging the solid-state electrolyte, thus causing a short.  The most pressing problem has been the incompatibility of the slurry solvent with the solid-state electrolyte.  We thus have developed an aqueous based slurry that when dried results in a low impedance, structurally robust positive electrode that does not damage the solid-state electrolyte.  The solid-state performance of this electrode with nanoscale LiFePO4 as the active material will be presented.

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