Semiconductor Physics, Quantum Electronics & Optoelectronics, 29 (1), P. 066–079 (2026).
DOI: https://doi.org/10.15407/spqeo29.01.066

Charge-discharge processes in solid electrolyte heterostructures Ag_7x(Ge_1xP_x)S₅I for electrochemical energy devices

V.S. Bilanych^1,2*, A.A. Slyvka¹, S.I. Vorobiov², A.I. Pogodin¹, T.O. Malakhovska¹, I.M. Mohylyuk¹, V. Komanicky<sup>2

1</sup>Uzhhorod National University, 46 Pidhirna Street, 88000 Uzhhorod, Ukraine
²Pavol Jozef afrik University, Park Angelinum 9, Koice 04001, Slovakia
*Corresponding author e-mail: vitaliy.bilanych@uzhnu.edu.ua

Abstract. Charge–discharge processes in solid electrolyte heterostructures Ag|Ag_7x(Ge_1xP_x)S₅I|Se with different Ge/P ratios were investigated. Heterovalent substitution of Ge⁴⁺ by P⁵⁺ significantly affects ionic conductivity, relaxation time, and polarization at interfaces. Using galvanostatic cycling and current–voltage measurements, dependences of U(t) on composition and cycle number were obtained. Diffusion coefficients, Ag⁺ mobility, ionic resistance and transference numbers (t_ion 0.994–0.999) confirm predominantly ionic transport. Asymmetry of charge accumulation and release is related to Ag₂Se phase formation and interfacial polarization. The studied materials demonstrate high ionic conductivity and stability, making them promising for solid-state electrochemical devices.

Keywords: superionic conductors, argyrodite structure, Ag_7x(Ge_1xP_x)S₅I, solid electrolyte heterostructures, Ag⁺ ion diffusion, charge-discharge processes, interfacial polarization, solid-state electrochemical devices.

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