Compatibility, electrode-electrolyte

In conclusion, because of the electrochemical importance of the electrode-electrolyte interface, it is necessary to consider the chemical and mechanical compatibility of a candidate electrolyte material with the electrodes required for a given application. For a typical cathode region in a battery, in which active cathode material together with a small proportion of carbon powder to enhance electronic conductivity is incorporated in a matrix of ionically conducting polymer electrolyte, it may also be necessary to consider materials compatibility problems that arise at the cathode compartment-current collector interface. Finally, compatibility problems can arise with inter-cell insulating layers and also with encap-sulant materials. 

On the other hand, oxyalkyl-substituted polymers are also potentially attractive for the known cation coordinating properties of their ether groups, which are expected to improve ionic transport in the polymers and, hence, to give faster electrochromic response time. The ether-group compatibility of these polymers with polyethylenoxide-based polymer electrolytes is also expected to improve the electrode-electrolyte contact in solid-state electrochromic devices. 

In certain IL systems, such as ethyl-methyl imidazolium-AICI4, Mg metal visibly dissolves. We tried to repeat the experiments described by Nuli et al. [50,51] but were unable to obtain any reversible behavior of Mg electrodes or reversible Mg deposition-dissolntion processes or noble metal electrodes in any of the IL systems described in Fig. 13.8. Hence, we have to conclude that most commonly used ILs, including those showing apparent high cathodic stability, are not suitable solvents for reversible Mg electrodes. Thereby, ILs cannot be considered as compatible/promising electrolyte solutions for non-aqueous magnesium electrochemistry. 

The chaimel-flow electrode has often been employed for analytical or detection purposes as it can easily be inserted in a flow cell, but it has also found use in the investigation of the kinetics of complex electrode reactions. In addition, chaimel-flow cells are immediately compatible with spectroelectrochemical methods, such as UV/VIS and ESR spectroscopy, pennitting detection of intennediates and products of electrolytic reactions. UV-VIS and infrared measurements have, for example, been made possible by constructing the cell from optically transparent materials. 

Improve electrolyte material, using better conductors that are still chemically compatible with the electrodes. 

An electrolyte may be characterized by resistance / [Qcm], which is defined as the resistance of the solution between two electrodes at a distance of 1 cm and an area of 1 cm2. The reciprocal value is called the specific conductivity at[Q" cm"1] [5], For comparison the values of k for various materials are given in Fig. 2 Here is a wide spread for different electrolyte solutions. The selection of a suitable, high-conductivity electrolyte solution for an electrochemical cell depends on its compatibility with other components, such as the positive and negative electrodes. 

Sec. 7.4.1), a large range of acid-base properties, and often a better solubility for many materials, electrolytes and nonelectrolytes, better compatibility with electrode materials, and increased chemical stability of the solution. Their drawbacks are lower conductivity, higher costs, flammability, and environmental problems. 

Several factors are considered in the design of an electrolytic production cell. These include (i) the nature of the product desired, the starting materials, and the level of production to be achieved (ii) the current density, the current efficiency, the permissible recovery, and the electrolysis temperature (iii) the compatibility of the container material with the electrolyte and of the electrodes with the electrolyte and (iv) any specific requirements associated with the handling of the electrode products. 

---