Electrochemical voltage cycling

Fig. 25. Absorption coefficient vs. photon frequency for PITN. The data were obtained in situ during the injection part of the electrochemical doping cycle with (CI04 ) as the dopant. The cell voltages and corresponding dopant concentrations (in mol%) are indicated. Reproduced from [456b],...

For convenience and simplicity, the electrochemical study of electrode materials is normally made in hthium/(electrode material) cells. For carbonaceous materials, a lithium/carbon cell is made to study electrochemical properties, such as capacity, voltage, cycling life, etc.. Lithium/carbon coin cells use metallic lithium foil as the anode and a particular carbonaceous material as the... 

Change in electrochemical area and oxygen reduction specific activity for Pt and PtCo cathodes during a 0.9-0.7 V voltage cycling as a function of log cycle number 900 mV, H2/O2 2/10 stoichiometry, 150 kPa j, 80°C. (S. C. Ball et al.. Electrochemical Society Transactions, 11, 1267 (2007). Reproduced by permission of The Electrochemical Society.)... 

Figure 23.21. TEM image of membrane close to membrane/cathode interface (top) and Pt particle size distribution (bottom) from a MEA cross-section after AST voltage cycling xmder air flowing in cathode (bottom right) and N2 flowing in cathode (bottom left) [37]. (Reprinted by permission of ECS—The Electrochemical Society, from Li J, He P, Wang K, Davis M, Ye S. Characterization of catalyst layer structural changes in PEMFC as a function of durability testing.)...

Impact of per cent relative humidity (% RH) on Pt loss (%), based on the sum of Pt measured in the membrane and Pt washed out from the MEA, and Pt size increase (%), after 3000 voltage cycles from 0.6-1.2 V.The 30% RH test only ran for 1500 cycles. (Source Dutta et al., 2010, reproduced by permission ofThe Electrochemical Society.)... 

Sun YK, Han JM, Myung ST, Lee SW, Amine K (2006) Significant improvement of high voltage cycling behavior AlFa-coated LiCo02 cathode. Electrochem Commun 8 821-826... 

F igure 21 compares the voltage-capacity profiles for the second cycle of lithium/carbon electrochemical cells made from OXY, a representative hard carbon, and those for samples made from CRO, a representative soft carbon. 

There are distinct differences in the electrochemical behavior of lithium cells constructed with /1-Mn02 electrodes prepared by acid treatment and those containing Li[Mn2]04 electrodes [120].Cells with A-Mn02 electrodes show an essentially featureless voltage profile at 4V on the initial discharge on subsequent cycling, the cells show a profile more consistent with that expected from an Li[Mn2]04 electrode. 

Fig. 11.3 Electrochemical performance of CNFs CNTs. (a) Galvanostatic discharge/charge (Li inser-tion/extraction, voltage decrease/increase) curves of CNFs CNTs at a cycling rate of C/5 in 1M LiPF6 in 1 1 (v/v) ethylene carbonate (EC)/dimethyl carbonate (DMC) (b) comparison of the electrochemical performance of pristine CNTs and CNFs CNTs in 1M LiPF6 in EC/DMC solution (reprinted with permission from [25]).

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