Publications by authors named "Jeffrey Nash"
The Li- and Mn-rich layered oxide cathode material class is a promising cathode material type for high energy density lithium-ion batteries. However, this cathode material type suffers from layer to spinel structural transition during electrochemical cycling, resulting in energy density losses during repeated cycling. Thus, improving structural stability is an essential key for developing this cathode material family.
View Article and Find Full Text PDFA multiscale investigation elucidating the structural complexities and electrochemical properties of layered-layered composite cathode materials synthesized at low temperatures.
Phys Chem Chem Phys
March 2020
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.
The data in this study are related to the research article "Core-shell electrospun and doped LiFePO/FeS/C composite fibers for Li-ion batteries" [1]. Core-shell LiFePO/FeS/C composites fiber were prepared via an electrospinning method for use as cathodes in Li-ion batteries. The data presented in this paper showed the effect of electrospinning parameters, including applied voltage, solution flow rate, the concentration of polyvinylpyrrolidone (PVP) (wt%) and a mixed PVP/PEO (polyethylene oxide) (w/w%) polymers on the morphological properties of composites fibers.
View Article and Find Full Text PDFArticle Synopsis
- Lithium-rich layered oxide materials, such as xLi2MnO3·(1 - x)LiMO2, show great potential as cathode materials in electric vehicle batteries due to their high energy density of approximately 900 W h kg-1.
- The research investigates how different cycling rates impact the structural stability and electrochemical properties of a 0.5Li2MnO3·0.5LiCoO2 composite, highlighting that higher cycling rates slow down the activation of Li2MnO3.
- Findings indicate that a slower activation of Li2MnO3 results in less phase transition to spinel form and enhances overall cycling stability, which is crucial for efficient battery performance.