期刊
ADVANCED ENERGY MATERIALS
卷 12, 期 7, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202103052
关键词
lithium ion batteries; Ni-rich layered materials; low-Ni layered materials; synchrotron-based X-ray analysis; strategic approaches
类别
资金
- Fundamental R&D Program for Technology of World Premier Materials
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2019R1A2C2003731, 2021M3H4A1A02045953]
- National Research Foundation of Korea [2019R1A2C2003731] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Comparative study of NCM523 and NCA reveals that NCM523 exhibits better performance in the high-voltage region, with less anisotropic lattice distortion and wider Li-ion channels, as well as superior cyclability and thermal stability; therefore, the utilization of low-Ni layered cathode materials operated at high voltage is a strategic approach to expand the design factors of advanced LIBs.
Over the past few years, considerable attention has been paid to high-Ni layered cathode materials for high-energy Li-ion batteries (LIBs); however, these materials intrinsically have low thermal stability. Alternatively, the high-voltage operation of low-Ni materials may be one of the attractive ways to provide various options for designing advanced LIBs. Here, the structural, electrochemical, and thermal properties of LiNi0.5Co0.2Mn0.3O2 (NCM523) and LiNi0.80Co0.15Al0.05O2 (NCA) are investigated by setting up the same initial discharge capacity. In the high-voltage region, NCM523 exhibits less anisotropic lattice distortion and maintains wider Li-ion channels than NCA. After long-term cycling, reduced Ni ions are observed near the cracks, grain boundaries, or between the primary particles in both materials, however, the chemical states of the Ni ions in NCA are more heterogeneously distributed, and the particle pulverization and microcrack propagation are more prominent; the structural integrity and electrochemical properties of the material are degraded. Moreover, the cyclability and thermal stability of NCM523 are superior to those of NCA, despite the higher charge cut-off voltage of the former. Therefore, the utilization of low-Ni layered cathode materials operated at high voltage is a strategic approach to expand the design factors of advanced LIBs.
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