Unraveling Reversible Redox Chemistry and Structural Stability in Sn-Doped Li-Rich Layered Oxide Cathodes

Soyeong Yun, Shoaib Muhammad, Jinhyuk Choi, Wontae Lee, Junwoo Yu, Hayeon Lee, Yongjae Lee, Won Sub Yoon

Research output: Contribution to journalArticlepeer-review


Li-rich layered oxides have received the spotlight as cathode materials to improve the energy density in recent years. However, Li-rich layered oxides accompanied by cation migration during extended cycles suffer from low-capacity retention and structural degradation through the phase transition. In this study, we synthesized a Li2IrO3material substituting Sn for Ir, confirming that Li2Ir0.75Sn0.25O3exhibits improved cycle performance and structural stability. This enhancement is due to the highly reversible structural changes originating from the biphasic reaction, including the O3′ phase. The intermediate O3′ phase has a distorted IrO6octahedron by the migration of Sn, thus enlarging interslab thickness and providing a facile Li diffusion environment. More importantly, migrated Sn ions can return to the transition metal layer during the discharging process. This reversible cation migration prevents structural collapse, thus improving cycle performance. These fundamental understandings of reversible cation migration for the Li-rich materials can provide insightful factors for designing high-energy cathode materials.

Original languageEnglish
Pages (from-to)3989-3996
Number of pages8
JournalACS Energy Letters
Issue number11
Publication statusPublished - 2022 Nov 11

Bibliographical note

Funding Information:
This study was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2021M3H4A1A02045953 and No. 2022R1A2B5B02002624).

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry


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