Papers by Jessica Orlenius
Journal of Power Sources, 2012
ABSTRACT A water based solid state synthesis of LiFePO4 has been conducted by utilizing freeze gr... more ABSTRACT A water based solid state synthesis of LiFePO4 has been conducted by utilizing freeze granulation. Various processing conditions were tested and achieved powder properties were characterized by density, XRD, specific surface area, carbon content, conductivity and SEM. Freeze granulation, a novel method for precursor preparation was shown to be an effective method to provide high degree of homogeneity prior to calcination and high ultimate yield of pure LiFePO4. Cathodes were manufactured by water based as well as NMP system based tape casting. A commercial LiFePO4/C powder was also characterized and used to manufacture cathodes as comparison in this study. Charge cycling tests showed promising results with high capacity and long term stability, well in the range of what the commercial powder provided. Post-milling of calcined powder prior to paste preparation for tape casting tended, however, to retard the capacity owing to disturbed carbon distribution and loss of conductivity of the LiFePO4/C. In comparison with the solvent system for cathode manufacturing, the water based system gave similar cell performance, illustrating the possibility to apply a more environmentally sustainable processing of Li-battery cells.
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International Journal of Cast Metals Research, 2008
ABSTRACT The effect of mould filling on the hydrogen and nitrogen concentration in grey cast iron... more ABSTRACT The effect of mould filling on the hydrogen and nitrogen concentration in grey cast iron has been investigated. A special mould was designed and the influence of several process and mould parameters, such as degree of turbulence, permeability, core binder and coatings, were studied. The hydrogen concentration increased during mould filling and the absorption was favoured by turbulent filling, low permeability and larger gas evolution from the mould and cores. In some cases, the hydrogen concentration in the iron after mould filling almost reached the solubility limit, which increases the risk that gas precipitates during solidification. Exact values of the influence of mould filling on the nitrogen concentration could not be obtained, but some observations could still be conducted. The absorption of nitrogen seemed to be favoured by the same parameters as hydrogen.
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Journal of Cleaner Production, 2010
... Comparison with other studies 5.2. ... Packaging, Polypropylene, 5, 5. ... and low price of l... more ... Comparison with other studies 5.2. ... Packaging, Polypropylene, 5, 5. ... and low price of lithium chloride indicate that this means an underestimation of the environmental impact, since there is very often a strong correlation between price and environmental impact (Gregory et al., 2009 ...
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Papers by Jessica Orlenius