التفاصيل البيبلوغرافية
| العنوان: |
Nanoscale electrical characterization of ambient-induced surface impurities on high-nickel cathode materials for lithium-ion batteries. |
| المؤلفون: |
Cho, Mingi1 (AUTHOR), Lee, Sang Hoon2 (AUTHOR), Yuk, Eunseo1 (AUTHOR), Park, Hyeonho1 (AUTHOR), Kim, Seong Heon1,3 (AUTHOR) shkim97@jbnu.ac.kr |
| المصدر: |
Journal of Alloys & Compounds. Nov2023, Vol. 963, pN.PAG-N.PAG. 1p. |
| مصطلحات موضوعية: |
*KELVIN probe force microscopy, *SURFACE analysis, *LITHIUM-ion batteries, *CATHODES |
| مستخلص: |
One of the most critical points in the study of LIB-related materials is the extremely high reactivity of Li. In addition to pure Li metal, many Li-containing materials employed in LIBs are highly reactive under ambient conditions. Therefore, they should be stored and treated in an inert environment, such as vacuum chambers and gloveboxes filled with inert gases. In particular, most pristine cathode materials contain Li and are more reactive in air than pristine anode materials are. For instance, various impurities, mostly Li 2 CO 3 , are grown on the surface of pristine NCA (LiNi x Co y Al z O 2 , x + y + z = 1) materials. The precise characterization of these ambient-induced surface impurities is critical for understanding the intrinsic properties of these cathode materials. In this study, we directly image and characterize ambient-induced surface impurities formed on the surface of high-Ni NCA (LiNi 0.8 Co 0.15 Al 0.05 O 2) materials using Kelvin probe force microscopy (KPFM) and scanning spreading resistance microscopy (SSRM). The ambient-induced surface impurities show clearly distinguishable work functions and resistance features compared with the pristine NCA surface. In particular, it is confirmed that the resistance of ambient-induced impurities is significantly higher than that of pristine NCA materials, which can deteriorate the performance of LIB cells. This study provides direction for the fabrication, storage, and processing of LIB cathode materials. • Ambient-induced surface impurities formed on the surface of NCA cathode materials were directly imaged and characterized. • KPFM and SSRM were used for measuring the work function and the resistance of ambient-induced impurities at the nanoscale. • The ambient-induced surface impurities have distinguishable work functions compared with the fresh NCA surface. • The resistance of ambient-induced impurities was significantly higher than that of the fresh NCA surface. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
Academic Search Index |
