Rational design of Li off-stoichiometric Ni-rich layered cathode materials for Li-ion batteries

Seok Hyun Song, Seokjae Hong, Moses Cho, Jong Gyu Yoo, Hyeong Min Jin, Sang Hyuk Lee, Maxim Avdeev, Kazutaka Ikeda, Jongsoon Kim, Sang Cheol Nam, Seung Ho Yu, Inchul Park, Hyungsub Kim

Research output: Contribution to journalArticlepeer-review

Abstract

The electrification trend in the automotive industry is fueling research on Ni-rich layered NCM cathode materials with high specific capacities. The simplest way to maximize the electrochemical performance of Ni-rich NCM is to tune the crystal structure by controlling the Li content and synthesis temperature. Herein, we demonstrate the critical roles of the Li content and synthesis temperature in determining the crystal structure of Li-excess Ni-rich NCM with enhanced electrochemical performance. The crystal structure of Li-excess Ni-rich NCM was systemically investigated using X-ray diffraction, neutron diffraction, and X-ray absorption spectroscopy, revealing that excess Li can be accommodated in Ni-rich NCM as the synthesis temperature decreases, resulting in stable cycle performance at high working voltage. We believe that our findings provide a rational reason for the excess amount Li required for optimization of the synthesis of Ni-rich NCM and offer insight for the simplest design of Ni-rich cathode materials that are stable under high-voltage operation.

Original languageEnglish
Article number137685
JournalChemical Engineering Journal
Volume448
DOIs
Publication statusPublished - 2022 Nov 15

Keywords

  • Cathodes
  • Li-excess
  • Li-ion batteries
  • Ni-rich NCM
  • Synthesis

ASJC Scopus subject areas

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

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