Role of Cu Dopant in Improving the Structural Stability of O3-Type Sodium-Ion Battery Cathode: Mitigating Oxidation State Variation toward Reinforcing Aqueous Stability

Jae Yeol Park; Hyun Beom Kang; Dongmin Jeon; Yoonsu Shim; Eunmi Jo; Yeoreum Hong; Sang Hyuk Gong; Jong Min Yuk; Chan-Woo Lee; Dongjin Byun; Hyung-Seok Kim; Seung Min Kim; Wonyoung Chang

doi:10.1021/acsmaterialslett.5c01163

journal article·2025-11-03

Role of Cu Dopant in Improving the Structural Stability of O3-Type Sodium-Ion Battery Cathode: Mitigating Oxidation State Variation toward Reinforcing Aqueous Stability

Jae Yeol Park, Hyun Beom Kang, Dongmin Jeon, Yoonsu Shim, Eunmi Jo, Yeoreum Hong, Sang Hyuk Gong, Jong Min Yuk, Chan-Woo Lee, Dongjin Byun, Hyung-Seok Kim, Seung Min Kim, Wonyoung Chang

ACS Materials Letters· Volume 7· Issue 11

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Source abstract

Abstract

We propose a mechanism of how Cu substitution in the O3-type sodium-ion battery cathode enhances its aqueous stability compared to the Co-doped O3-type cathode. The aqueous stability is closely associated with the crystal structural stability. Cu dopant allows electronic redistribution, leading to maintaining its oxidation state upon desodiation. It also mitigates changes in polyhedral volume of transition metal-O 6, resulting in high structural stability upon desodiation. In contrast, the Co dopant is oxidized upon desodiation, inducing larger polyhedral volume variations. It finally entails structural instability of the Co-doped cathode, which can be exacerbated during vigorous desodiation. Therefore, in an aqueous environment, the Co-doped cathode experiences severe structural degradation to form OP4, Fd3̅m, and C2/m phases, retaining only 19% of Na-storing capability. In contrast, the Cu-doped cathode retains the original structure, thereby preserving 82% of its Na-storing capability. Our findings provide invaluable insights on resolving storage and handling issues of sodium-ion battery cathodes induced by their moisture sensitivity.

Source: openalex_inverted_index · Quality: baseline

Research context

Energy storage Composites

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Advanced Battery Technologies Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Energy Storage Research Center

Korea Institute of Science and Technology (KIST)

Department of Materials Science and Engineering

Korea University

Energy AI & Computational Science Laboratory, Energy Storage Research Department

Korea Institute of Energy Research (KIER)

Department of Materials Science & Engineering

Korea Advanced Institute of Science and Technology (KAIST)

Division of Energy & Environment Technology, KIST School

University of Science and Technology

KIER School

Yonsei-KIST Convergence Research Institute

Yonsei University

Institute of Advanced Composite Materials

Korea Institute of Science and Technology

Department of JBNU-KIST Industry-Academia Convergence Research

Jeonbuk National University

Funding

Commercializations Promotion Agency for R and D Outcomes · National Research Council of Science and Technology · National Research Foundation of Korea · Korea Institute of Science and Technology

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