Download file (8.14MB)
Download as zip (7.48MB)

コレクション

引用

説明:

While high-voltage operation of mid-Ni layered oxide cathodes in full-cell Li-ion batteries is essential for achieving high energy density, it inevitably accelerates electrode degradation, ultimately resulting in capacity loss. However, the underlying degradation mechanisms under high-voltage conditions remain poorly understood. In this study, we reveal that anode slippage – induced by cross-talk-driven surface degradation – is the dominant factor in capacity fade during high-voltage (4.35 or 4.40 V) cycling of single-crystal mid-Ni layered oxide (SC-NCM)/graphite pouch full-cells. Electrochemical and post-mortem analyses show that, although high-voltage operation induces cathode surface degradation, including lattice oxygen loss and phase transitions, its direct impact on capacity loss is relatively minor compared to that of the anode. Instead, anode degradation is primarily caused by cross-talk effects from cathode Ni dissolution, which promote the accumulation of irreversible organic byproducts – such as LiOx and Li2CO3—within the solid electrolyte interphase (SEI) layer of the graphite anode. This leads to increased resistance and reduced anode electrochemical activity, disrupting electrode balance and accelerating full-cell capacity fade. These findings highlight the critical role of anode degradation in high-voltage operation and emphasize the importance of mitigating cross-talk effects. A comprehensive understanding of cross-talk – induced anode slippage is therefore critical for the rational design of high-voltage mid-Ni full-cell systems with long-term durability.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Lithium-ion batteries, anode slippage, high-voltage cycling, Single-crystal mid-ni NCM, full-cell, cross-talk

刊行年月日: 2025-12-31

出版者: Taylor & Francis

掲載誌:

• Science and Technology of Advanced Materials (ISSN: 14686996) vol. 26 2502324

研究助成金:

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5485

公開URL: https://doi.org/10.1080/14686996.2025.2502324

関連資料:

その他の識別子:

連絡先:

更新時刻: 2025-07-16 16:14:52 +0900

MDRでの公開時刻: 2025-05-20 08:18:53 +0900