Journalartikel

Jahr der Veröffentlichung: 2021

Seiten: 2624-2634

Zeitschrift: Chemistry of Materials

Bandnummer: 33

Heftnummer: 7

ISSN: 0897-4756

DOI Link: https://doi.org/10.1021/acs.chemmater.1c00471

Verlag: American Chemical Society

Abstract: 
The application of nickel-rich LiNixCoyAlzO2 (NCA) cathode materials in solid-state lithium-ion batteries (SSBs) promises significant improvements in energy density, stability, and safety over traditional lithium-ion batteries with liquid electrolytes. However, low active mass utilization and strong capacity fading associated with degradation of the cathode often limit SSB applicability. The use of single-crystalline cathode active materials (CAMs) instead of spherical polycrystalline materials optimized for performance in lithium-ion batteries recently emerged as a promising approach in the field of SSBs to overcome this issue. In this work, single-crystalline LiNi0.8Co0.15Al0.05O2 (SC-NCA) is investigated as cathode active material for SSBs. It is shown that appropriate postprocessing of as-synthesized materials, which consists of washing steps with either water or ethanol followed by postannealing at different temperatures, is key to achieve high-performance cathodes. X-ray powder diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and scanning transmission electron microscopy are employed to characterize the effect of postprocessing on structure and morphology. The postprocessing procedure was tailored to mitigate detrimental side reactions that result in structural damage of the SC-NCA, while retaining the beneficial effects of deagglomeration and control of surface impurities. Washing with ethanol and subsequent postannealing at 750 degrees C allowed us to obtain SC-NCA materials that perform well in SSB cells with Li6PS5Cl as solid electrolyte, enabling a high initial discharge capacity of 174 mAh g(-1), good rate performance, and high capacity retention (94% after 200 cycles) at 25 degrees C.

Harvard-Zitierstil: Fantin, R., Trevisanello, E., Ruess, R., Pokle, A., Conforto, G., Richter, F., et al. (2021) Synthesis and Postprocessing of Single-Crystalline LiNi0.8Co0.15Al0.05O2 for Solid-State Lithium-Ion Batteries with High Capacity and Long Cycling Stability, Chemistry of Materials, 33(7), pp. 2624-2634. https://doi.org/10.1021/acs.chemmater.1c00471

APA-Zitierstil: Fantin, R., Trevisanello, E., Ruess, R., Pokle, A., Conforto, G., Richter, F., Volz, K., & Janek, J. (2021). Synthesis and Postprocessing of Single-Crystalline LiNi0.8Co0.15Al0.05O2 for Solid-State Lithium-Ion Batteries with High Capacity and Long Cycling Stability. Chemistry of Materials. 33(7), 2624-2634. https://doi.org/10.1021/acs.chemmater.1c00471