Comparative study of polycrystalline and single-crystal NCM811 cathode materials: the role of crystal defects in electrochemical performance

文献情報

出版日 2023-12-18

DOI 10.1039/D3TA03290F

インパクトファクター 12.732

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要旨

This study investigates the electrochemical performance of polycrystalline and single-crystal NCM811 materials. Our findings show that the polycrystalline sample has a higher discharge capacity and better C-rate performance than the single-crystal sample, while single crystal materials exhibit better capacity retention and cycling stability. We also find that crystal structure defects caused by Li/Ni mixing play an important role in structural stability during electrochemical cycling. In contrast to previous studies, we argue that the stability of single crystals is not only due to the less generation of microcracks but also due to their near-perfect Rm crystal layer structure. Additionally, we find that lattice disorder resulting from crystal fusion rearranges during the transition from polycrystalline to single crystal morphology can significantly affect the release of electrochemical properties of the material. Our study suggests that reducing crystal structure defects in polycrystalline materials and improving lithium ion diffusion in single crystal materials can enhance their electrochemical performance. Our study provides valuable insights into the relationship between crystal morphology and electrochemical performance, which can guide the design and synthesis of high-performance cathode materials for lithium-ion batteries.

掲載誌

Journal of Materials Chemistry A

CiteScore: 19.5

自己引用率: 4.7%

年間論文数: 2211

Journal of Materials Chemistry A, B & C cover high quality studies across all fields of materials chemistry. The journals focus on those theoretical or experimental studies that report new understanding, applications, properties and synthesis of materials. The journals have a strong history of publishing quality reports of interest to interdisciplinary communities and providing an efficient and rigorous service through peer review and publication. The journals are led by an international team of Editors-in-Chief and Associate Editors who are all active researchers in their fields. Journal of Materials Chemistry A, B & C are separated by the intended application of the material studied. Broadly, applications in energy and sustainability are of interest to Journal of Materials Chemistry A, applications in biology and medicine are of interest to Journal of Materials Chemistry B, and applications in optical, magnetic and electronic devices are of interest to Journal of Materials Chemistry C. More than one Journal of Materials Chemistry journal may be suitable for certain fields and researchers are encouraged to submit their paper to the journal that they feel best fits for their particular article. Example topic areas within the scope of Journal of Materials Chemistry A are listed below. This list is neither exhaustive nor exclusive. Artificial photosynthesis Batteries Carbon dioxide conversion Catalysis Fuel cells Gas capture/separation/storage Green/sustainable materials Hydrogen generation Hydrogen storage Photocatalysis Photovoltaics Self-cleaning materials Self-healing materials Sensors Supercapacitors Thermoelectrics Water splitting Water treatment

Comparative study of polycrystalline and single-crystal NCM811 cathode materials: the role of crystal defects in electrochemical performance

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