Solid-State Ionic Conductivity in Energy Storage Materials

Solid-state ionic conductivity underpins the performance of next-generation energy storage devices by enabling safe, high-density charge transport without flammable liquid electrolytes. Inorganic and hybrid solid electrolytes—including ceramics, glasses and composites—are engineered to achieve conductivities approaching those of liquid counterparts, while offering enhanced mechanical robustness and broad electrochemical stability windows suitable for metallic anodes. Ion transport is governed by crystal structure topology, defect chemistry, grain-boundary resistance and electrode–electrolyte interfacial compatibility. Recent progress has shifted from empirical tuning of established materials to atomistic design of open-framework hosts, targeted doping strategies and interface engineering. Advanced characterisation techniques such as operando impedance spectroscopy and nuclear magnetic resonance have elucidated migration pathways and rate-limiting steps in both bulk and interfacial regions. These insights are guiding the integration of solid electrolytes into all-solid-state batteries and supercapacitors, targeting improvements in safety, cycle life and energy density for electric vehicles and grid-scale storage. Emphasis on scalable fabrication methods, low-temperature processing and discovery of novel superionic phases aims to overcome historic barriers in interfacial resistance and long-term stability.

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Solid-State Ionic Conductivity in Energy Storage Materials publication trend

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Technical terms

Solid electrolyte: A non-liquid ionic conductor that separates electrodes while allowing ion transport.

Ionic conductivity: A measure of an electrolyte’s ability to transport charged ions under an electric field, expressed in S cm⁻¹.

Activation energy: The energy barrier that ions must overcome to migrate between lattice sites, typically in kJ mol⁻¹.

NASICON: A family of sodium super-ion conductor structures with a three-dimensional phosphate framework supporting high sodium or lithium mobility.

Grain boundary: The interface between crystallites in a polycrystalline material, often impeding ion conduction relative to the bulk.

Cold sintering: A low-temperature densification process combining pressure and a transient liquid phase to consolidate ceramics at ≤ 200 °C.

References

1. Electrochemical Response of Cold‐Sintered Cathode‐Hybrid Electrolyte Bilayers: Deep Insights into the Determining Kinetic Mechanisms via Operando Electrochemical Impedance Characterization. Energy & Environmental Materials (2025).
2. Lithium‐ion Mobility in Li6B18(Li3N) and Li Vacancy Tuning in the Solid Solution Li6B18(Li3N)1−x(Li2O)x. Angewandte Chemie International Edition (2023).
3. Fast Lithium Ion Conduction in Lithium Phosphidoaluminates. Angewandte Chemie International Edition (2020).