Tailoring shape and exposed crystal facet of single-crystal layered-oxide cathode particles for all-solid-state batteries

Hoyeol Jeon, Deok Hwang Kwon, Hyoungchul Kim, Jong Ho Lee, Yongseok Jun, Ji Won Son, Sangbaek Park

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The design of composite cathode microstructures is important for improving the performance of all-solid-state batteries (ASSBs). The microstructural properties can provide efficient ionic/electronic percolation, good cathode/solid electrolyte (SE) contact, and minimal void spaces. Although the effects of the size of cathode and SE particles have been extensively investigated, the shape effects of cathode particles remain unexplored. Here, we demonstrate that the shape and exposed crystal facet of cathode particles affect the electrochemical performance of ASSBs using crack-free single-crystalline LiNi0.6Co0.2Mn0.2O2 (NCM) as the cathode and oxidation-tolerant Li3YCl6 as the SE. Systematic studies using five particle shapes (octahedra, plates, rods, spherical single crystals, and spherical polycrystals) reveal the important effects of the shape and exposed facets on the solid–solid contact as well as Li+ ion diffusion in composite cathodes. Single-crystalline octahedral NCM particles have a higher rate capability than that of their counterparts because their wide planar surface promoted plane-to-plane contact with the SE and the (0 1 2) facets provided straightforward 3D Li+ transfer channels between the surface and the center. These results suggest that single-crystal NCM cathodes with advanced shapes and exposed facets can enable the fabrication of ASSBs with superior performance.

Original languageEnglish
Article number136828
JournalChemical Engineering Journal
Volume445
DOIs
Publication statusPublished - 2022 Oct 1

Keywords

  • Exposed crystal facet
  • Halide solid electrolyte
  • Octahedral shape
  • Plane-to-plane contact
  • Solid electrolyte/cathode interface

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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