AI Article Synopsis
- Layered-layered composite (xLiMnO·(1 -x) LiMO) cathodes are promising for high energy density lithium-ion batteries but face stability issues due to complex phase changes during cycling.
- The preparation methods greatly influence the structural characteristics and stability of these materials, making it essential to understand their relationship with multiscale structural properties.
- In this study, 0.5LiMnO·0.5LiCoO composites were created with varying heating and cooling rates, revealing that while these rates don't affect crystal or local atomic structures, they significantly impact the microstructure, which in turn influences electrochemical performance.
Article Abstract
Layered-layered composite (xLiMnO·(1 -x) LiMO, M = Mn, Ni, Co, and Fe) cathode materials have attracted much attention as cathodes for high energy density lithium ion batteries. However, these materials are structurally unstable resulting from complicated phase transformation mechanisms during cycling. Additionally, the complex structural characteristics and structural stability of these materials largely depend on their preparation methods. Studying the correlation between multiscale structural properties and preparation methods is important in the development of layered-layered composite cathode materials. In this work, 0.5LiMnO·0.5LiCoO composite materials were prepared with different heating and cooling rates with a maximum temperature of 600 °C. The structural properties of the 0.5LiMnO·0.5LiMO composite materials were investigated using combined in situ X-ray absorption spectroscopy (XAS), in situ X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and high resolution transmission electron microscopy (HRTEM) techniques. Heating and cooling rates have no significant effect on either the crystal or local atomic structures of the prepared samples. However, the microstructure was critically important for its impact on electrochemical properties.
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Article Synopsis
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- The preparation methods greatly influence the structural characteristics and stability of these materials, making it essential to understand their relationship with multiscale structural properties.
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