Effect of thickness and uniformity of LiNbO3-coated layer on LiNi0.5Co0.2Mn0.3O2 cathode material on enhancement of cycle performance of full-cell sulfide-based all-solid-state batteries

Although LiNi0.5Co0.2Mn0.3O2 (NCM523) cathode active material (CAM) is considered to have application potential in sulfide-based all-solid-state batteries (ASSBs), CAM/solid electrolyte interfacial instability remains a significant limiting factor. To effectively improve the interfacial stability an...

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Veröffentlicht in:Journal of power sources 2023-09, Vol.577, p.233259, Article 233259
Hauptverfasser: Bong, Willy Shun Kai, Shiota, Akihiro, Miwa, Takuya, Morino, Yusuke, Kanada, Satoshi, Kawamoto, Koji
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Sprache:eng
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Zusammenfassung:Although LiNi0.5Co0.2Mn0.3O2 (NCM523) cathode active material (CAM) is considered to have application potential in sulfide-based all-solid-state batteries (ASSBs), CAM/solid electrolyte interfacial instability remains a significant limiting factor. To effectively improve the interfacial stability and long-term cycling performance, NCM523 cathode material was coated with LiNbO3 layers of different thicknesses and uniformity. As a result, the cycle performance was greatly enhanced by increasing the thickness and uniformity of the LiNbO3-coated layer. Our findings further demonstrate that a thick (≥9 nm) and uniform coated layer (surface without uncoated area) displays outstanding electrochemical performance, especially cycle stability (capacity retention of 85.1% after 300 cycles at 60 °C), indicating that this strategy is very effective for constructing high-performance NCM cathodes for sulfide-based ASSBs. Moreover, the performance improvement mechanism was investigated by electrochemical impedance spectroscopy (EIS) combined with XPS and TEM-EDX analysis. The findings reveal that controlling the thickness and uniformity of the coating material plays a crucial role in the effective suppression of interface side reactions and resultant performance degradation in NCM cathodes. •Performance of LiNbO3-coated LiNi0.5Co0.2Mn0.3O2 in sulfide-based cells was studied.•LiNbO3 layer thickness & uniformity affected the cyclability of all-solid-state cells.•Thicker & more uniform layers suppressed electrode/electrolyte interfacial reactions.•Outstanding cycling capability was achieved at LiNbO3 layer thicknesses of ≥9 nm.•The adopted interface engineering strategy may be applied to other cathode materials.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2023.233259