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Low-current discharge curves of thin-film lithium batteries with a lithium anode and different crystalline(c), amorphous (a), or nanocrystalline (n) cathodes. The capacity is expressed in µAh per unit of area (cm2) and thickness (µm) of the cathode films. The shape of the discharge curves is characteristic of each type of cathode. Some detailed performance data for cells with c-LiCoO2 and n-LixMn2-yO4 cathodes are given in other sections. Data for cells with c-LiMn2O4 and a- or c- V2O5 cathodes are available on request.
Low-current discharge curves of thin-film lithium batteries with a crystalline LiCoO2 cathode and different anodes. The capacity is expressed in µAh per unit of area (cm2) and thickness (µm) of the cathode film.
A convenient method for comparing the performance of different batteries is to plot the power vs. the energy as above. These plots illustrate the tradeoff between power (high discharge rates and low cathode utilization) with energy (low discharge rates and high cathode utilization). These batteries are all cathode limited; the numbers in the plot give the cathode thickness in mm. The power and energy are given per square centemeter of active battery area. In addition, we have added reference points indicating the specific and volumetric power and energy densities calculated including all the battery films plus the protective coating, but excluding the substrate.
LiCoO2-Ti-Al2O3.gif)
%20LiCoO2-Ti-Al2O3.gif)
The choice of the substrate material greatly effects the energy and power densities. Maximum values are achieved when batteries are deposited onto both sides of a very thin and light substrate.
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Date revised - 10/29/01 (njd)
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