Abstract
The ceramics based on (Cu0·5Ag0.5)7SiS5I solid solution of superionic conductor with argyrodite structure were prepared by using the powders with different particles size. The structural studies of powders were performed by XRD technique, while the ceramic samples with different average size of the crystallites were investigated by microstructural analysis. The total electrical conductivity of ceramic samples was measured by impedance spectroscopy in the frequency range from 10 Hz to 2 × 106 Hz and temperature interval from 292 K to 383 K. The contributions of ionic and electronic components into the total electrical conductivity were separated as well as their temperature behavior was studied. The dependences of ionic and electronic conductivity and their activation energies on average size of the crystallites in (Cu0·5Ag0.5)7SiS5I-based ceramic samples were investigated.
Highlights
Among ceramic materials, electrochemical ceramics have recently been widely studied in order to develop the latest technologies of electrochemical energy storage, which is caused by the rapid development of alternative energy sources, electric vehicles and portable electronic devices [1,2,3,4,5]
It is shown that the ceramic samples prepared by sintering powders obtained by grinding in a planetary ball mill are characterized by a more homogeneous microstructure, characterized by the distribution of particles in a narrower range, in contrast to the samples obtained by sintering a microcrystalline powder with a particle size of 10–50 μm (Fig. 2)
The obtained ceramic samples were investigated by microstructural analysis, which resulted in the dependences of size distribution and average crystallites size for (Cu0.5Ag0.5)7SiS5I ceramic samples
Summary
Electrochemical ceramics have recently been widely studied in order to develop the latest technologies of electrochemical energy storage, which is caused by the rapid development of alternative energy sources, electric vehicles and portable electronic devices [1,2,3,4,5]. Electrochemical capacitors (supercapacitors), batteries and fuel cells are usually used as electrochemical energy storage devices [2]. The most promising materials in this regard are solid electrolytes used in all-solid-state batteries. Sulfur-containing solid electrolytes attract considerable attention due to the high ionic conductivity, which is provided by the peculiarities of their crystal structure [5, 6, 9,10,11,12], among which it is worth noting complex phosphorus sulfides with Li+ and Na+. Sulfur-containing superionic compounds with ionic conductivity of Li+ and Na+ are difficult to obtain in the crystalline state [11], so they are obtained in glass-ceramic form [10, 11, 13, 14]
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