Annual Report 2012 - Latvijas Universitātes Cietvielu fizikas institūts
Annual Report 2012 - Latvijas Universitātes Cietvielu fizikas institūts
Annual Report 2012 - Latvijas Universitātes Cietvielu fizikas institūts
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RESEARCH OF CATHODE MATERIALS FOR LITHIUM IRON PHOSPHATE<br />
THIN FILM BATTERIES<br />
G. Kucinskis, G. Bajars, J. Kleperis, G. Čikvaidze, A. Lusis<br />
LiFePO 4 is a promising olivine-type cathode material for lithium ion batteries. Structural<br />
and electrochemical analysis has been carried out for LiFePO 4 bulk material and thin<br />
films deposited by RF magnetron sputtering (G.Kucinskis et all, <strong>2012</strong>). Thin films have<br />
lower effective surface area than bulk material samples due to their surface being<br />
smoother. Both bulk material and thin film electrochemical properties have been<br />
evaluated by cyclic voltammetry, chronopotentiometry and EIS. Bulk material<br />
gravimetric charge capacity was evaluated to be 135 mAh/g, thin film charge capacity<br />
corresponds to 45% of that determined for bulk material, and is 61 mAh/g. Lithium ion<br />
diffusion coefficients in LiFePO 4 bulk material and thin films have been determined at<br />
various states of charge and are observed to be lowest in equilibrium potential. The<br />
determined Li+ diffusion coefficient D Li at cell equilibrium potential are 5.9•10 -14 and<br />
9.7•10 -14 cm 2 /s for bulk material and thin films accordingly.<br />
DIFFERENTIAL OPTICAL ABSORPTION SPECTROSCOPY AS A TOOL TO<br />
MEASURE EMISSIONS FROM SHIPS IN HARBOUR<br />
J. Kleperis, L.Grinberga, A. Sarakovskis<br />
Institute of Solid State Physics of University of Latvia<br />
It is shown that the DOAS method with open light path is suitable for air pollution<br />
monitoring at the Riga Harbour. From monitoring data it is possible to track the source<br />
of emissions if average hourly concentrations of pollutants are analysed together with<br />
the meteorological data. As it is shown, sulphur dioxide sources in Harbour are mostly<br />
tankers manoeuvring through the river or standing at docks with powered engines during<br />
the handling of oil products. An open-beam DOAS system captures air pollution from a<br />
wider area and in case of observed high benzene emissions are from many different<br />
sources: rail cars, tankers, handling operations in the terminals, trucks and passenger<br />
cars, buses.<br />
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