Abstract
Non-Arrhenius ionic conductivity is observed in various solid electrolytes. The behavior is intriguing, because it limits the magnitude of ionic conductivity at high temperatures. Understanding the nature of this behavior is of fundamental interest and deserves attention. In the present study, the temperature dependence of the ionic conductivity in solids and liquids is analyzed using the Bond Strength–Coordination Number Fluctuation (BSCNF) model developed by ourselves. It is shown that our model describes well the temperature dependence of ionic conductivity that varies from Arrhenius to non-Arrhenius-type behavior. According to our model, the non-Arrhenius behavior is controlled by the degree of binding energy fluctuation between the mobile species and the surroundings. A brief discussion on a possible size effect in non-Arrhenius behavior is also given. Within the available data, the BSCNF model suggests that the size effect in the degree of the non-Arrhenius mass transport behavior in a poly (methyl ethyl ether)/polystyrene (PVME/PS) blend is different from that in a-polystyrene and polyamide copolymer PA66/6I.
Highlights
Ionic conduction in solids is one of the physical phenomena widely used in modern technology
This suggestion has strong implications for application because it limits the value of the ionic conductivity at high temperatures, which could be a serious obstacle in the use of solid electrolytes in devices
After giving a short review on our previous work regarding the description of non-Arrhenius-type ionic conduction, we present new results related to the subject
Summary
Ionic conduction in solids is one of the physical phenomena widely used in modern technology. From the fundamental science point of view, we still have not gained a satisfactory understanding of the physical phenomena occurring in battery materials. One of these phenomena is non-Arrhenius ionic conductivity, the topic of the present paper. The conductivity of these glasses follows the Arrhenius law at low temperature, while it deviates gradually from the straight line as the temperature increases, and at high temperature the conductivity seems to saturate, exhibiting a non-Arrhenius ionic conductivity behavior as a whole This experimental finding has attracted much interest from both fundamental and application points of view. In the last part of this paper, a discussion on possible size effect in non-Arrhenius behavior is given based on notions gained from ongoing and other studies
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