High capacity rechargeable coin cells using all active material electrodes and percolated networks of LiCoO2 blended with LiNi0.8Co0.15Al0.05O2

Abstract

Lithium-ion batteries have become a popular rechargeable energy storage technology due to high volumetric and gravimetric energy density. One route to increase energy density at the cell level is to increase electrode thickness. All active material (AAM) electrodes, fabricated via hydraulic compression and mild sintering of only electroactive material (no polymer binder or conductive additives) provide a robust route to thick lithium-ion electrodes. However, depending on the materials chosen, AAM electrodes can have high matrix electronic conductivity resistance due to low intrinsic electronic conductivity of the electroactive materials. Herein, a multicomponent AAM was constructed using a blend of electroactive material with high electronic conductivity to facilitate matrix electronic transport and high energy density to increase overall cell capacity. The electrode thicknesses were matched within the geometry of a 2032-type coin cell, resulting in high overall reversible capacity for these AAM electrode cells.