Aqueous Processing of LiCoO<sub>2</sub>–Li<sub>6.6</sub>La<sub>3</sub>Zr<sub>1.6</sub>Ta<sub>0.4</sub>O<sub>12</sub> Composite Cathode for High-Capacity Solid-State Lithium Batteries
Ruijie Ye, Martin Ihrig, Egbert Figgemeier, Dina Fattakhova‐Rohlfing, Martin Finsterbusch
Abstract
High Resolution Image Download MS PowerPoint Slide To fabricate ceramic composite cathodes LiCoO 2 –Li 6.6 La 3 Zr 1.6 Ta 0.4 O 12 (LCO-LLZTO) on an industrial scale, a water-based tape-casting process was developed, which is scalable and environmentally friendly. Additionally, the cosintering behavior of the two materials, often leading to poor electrochemical performance, was optimized via a Li 2 O-rich atmosphere. The resulting dense, free-standing, and phase-pure LCO-LLZTO mixed cathodes were assembled into full cells using a dual-layer solid polymer-ceramic separator and an In–Li anode. These cells show very high utilization rates for LCO of approximately 90% at a high areal capacity of over 3 mAh cm –2, demonstrating the potential of water-based tape-casting for a scalable and sustainable manufacturing of oxide-ceramic based solid-state Li batteries.