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Long-Cycling Coated LiCoO₂ Cathodes for Lithium Batteries : A Review
Fey, George Ting-Kuo,Kumar, T. Prem 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.7
The improved cycling properties of coated LiCoO₂cathodes are reviewed in this article. Three methods of coating: sol-gel, precipitation and mechano-thermal, are discussed. Both simple oxides such as Al₂O₃, SiO₂, TiO₂, ZrO₂, etc. and mixed oxides such as MgAl₂O₄ and ZrTiO₄ are compared as coating materials and, where possible, studies of nanomaterial coatings of the above are incorporated. Additionally, there is a brief comparison of the sol-gel and mechano-thermal coating methods. Structural data and morphology of the oxide-coated cathodes are correlated with electrochemical behavior. The enhanced cyclability is attributed to the suppression of cycle-limiting phase transitions. When a strong thin film of nanomaterial coating prevents the cathode from expanding structurally and dissolving into the electrolyte, cyclability is substantially enhanced. Furthermore, mixed oxide-coated cathodes demonstrate greater cycability than corresponding individual oxide-coated cathodes. Using Al₂O₃ as an example, the effect of precursor selection for the coating oxide on the cyclability of the coated cathodes is also discussed.
Loganathan Krishnaraj,Niranjan Ramesh,Rajendran Senthil Kumar,Prem Kumar George 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.9
Pozzolan, a modified cementitious material, has a major impact on the construction industry. Among the different composite materials, fly ash blended cement has great part due to its abundance. In recent years, the pulverized fly ash has become the key interest among the researchers because of its improved physical properties. This makes it necessary to study the effect of fly ash blends with various chemical admixtures. This study primarily focuses on bringing the changes happening in the strength, retarding mechanism, setting time, mineralogy, and microstructure caused by the addition of Zinc Sulphate (ZnSO4) in concrete having various percentages of raw fly ash (RFA) and ultrafine fly ash (UFFA). The result shows that ZnSO4 increases the setting time by more than 60%. Also, the study indicates decreased strength in concrete because of the reduced formation of hydrated products; this phenomenon is confirmed by scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray fluorescence (XRF) analysis.