논문 해외 국제전문학술지(SCI급) Effect of Electrolytes on the Cathode-Electrolyte Interfacial Stability of Fe-Based Layered Cathodes for Sodium-Ion Batteries
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2022-03
- 저자명 Jehee Park, Kyojin Ku, Seoung-Bum Son, Jihyeon Gim, Youngsik Kim, Eungje Lee, Christopher Johnson
- 학술지명 Journal of The Electrochemical Society
- 발행처명 IOP Publishing
- 발행국가 해외
- 논문언어 외국어
- 원문 링크 https://iopscience.iop.org/article/10.1149/1945-7111/ac5c41/meta
홈페이지논문 초록 (Abstract)
Iron (Fe)-based layered oxide cathodes that employ Fe3+/Fe4+ redox reaction present a family of attractive cathode materials for sodium-ion batteries as iron is abundant, low-cost, and environmentally benign. However, their electrochemical performance is not yet satisfactory and requires further improvement. In this study, we investigate the effect of electrolytes on the electrochemical performance of α-NaFeO2, a prototypical model of Fe-based layered cathodes. First, we established the critical impact of the poor cathode-electrolyte interfacial stability on cell performances. Systematic electrochemical tests and material characterizations further revealed the degradation mechanism in which the highly reactive Fe4+ state in the charged Na1−xFeO2 electrodes promotes severe electrolyte decomposition and subsequent growth of a thick interface layer that leads to impedance rise and performance degradation. In addition, the superior performance of NaPF6 over NaClO4 and the beneficial effect of the FEC additive are reported.