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

11 Citations (Scopus)

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

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) funded by the Korea government (MSIT) (Grant No. NRF-2017M2A2A6A05017652 and 1711139323 ). This work was also supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (20221B1010003B, Integrated High-Quality Technology Development of Remanufacturing Spent Cathode for Low Carbon Resource Recirculation) and RIST-POSCO R&D program funded by POSCO (2020A023). Neutron total scattering measurement was approved by the Neutron Science Proposal Review Committee of J-PARC MLF (Proposal No. 2020A0017).

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) funded by the Korea government (MSIT) (Grant No. NRF-2017M2A2A6A05017652 and 1711139323). This work was also supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (20221B1010003B, Integrated High-Quality Technology Development of Remanufacturing Spent Cathode for Low Carbon Resource Recirculation) and RIST-POSCO R&D program funded by POSCO (2020A023). Neutron total scattering measurement was approved by the Neutron Science Proposal Review Committee of J-PARC MLF (Proposal No. 2020A0017).

Publisher Copyright:
© 2022 Elsevier B.V.

Keywords

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

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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