Thin Film Solid Electrolytes for Energy Storage Systems

Thin-film solid electrolytes are at the forefront of all-solid-state energy storage research, offering routes to safer, higher-performance batteries with minimal footprint. By depositing ion-conducting layers—typically below a few micrometres thick—between electrodes, these materials shorten ion-diffusion paths and eliminate hazards associated with liquid electrolytes. Key families include oxynitride glasses such as lithium phosphorus oxynitride, sulphide-based glasses, garnet-structured oxides and amorphous composites, each balancing ionic conductivity, chemical stability and mechanical robustness. Fabrication methods span physical vapour deposition, pulsed-laser deposition, chemical vapour deposition and magnetron sputtering, while emerging low-temperature approaches such as tape-casting enhance compatibility with temperature-sensitive substrates. Applications range from micro- and nano-scale power sources for implantable devices and flexible electronics to high-energy modules for electric vehicles and grid storage. Advances in interfacial engineering, compositional tuning and three-dimensional architectures have improved performance, yet challenges remain in raising room-temperature conductivity, reducing interfacial resistance and scaling production cost-effectively. Ongoing innovations in deposition control, non-crystalline electrolyte design and interface stabilisation promise to realise compact, durable and high-energy solid-state systems.

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Thin Film Solid Electrolytes for Energy Storage Systems publication trend

The graph below shows the total number of articles in thin film solid electrolytes for energy storage systems across all publications each year (not limited to Nature Index journals).

Technical terms

Thin-film solid electrolyte: A continuous ionic conductor layer, typically under a few micrometres thick, serving as the ion-transport medium in compact energy storage devices.

Ionic conductivity: A measure of a material’s ability to transport charged ions, expressed in siemens per centimetre and critical to battery rate performance.

Interfacial stability: The capacity of electrode–electrolyte interfaces to maintain chemical and mechanical integrity under cycling and thermal stress.

Tape-casting: A low-temperature fabrication technique in which ceramic or composite suspensions are cast as uniform, thick electrode layers prior to integration with thin-film electrolytes.

Microbattery: A miniaturised solid-state battery, often fabricated via thin-film processes, enabling direct integration with microelectronic systems.

References

1. All-Solid-State Thin-Film Lithium-Sulfur Batteries. Nano-Micro Letters (2023).
2. Tape‐casting electrode architecture permits low‐temperature manufacturing of all‐solid‐state thin‐film microbatteries. Interdisciplinary Materials (2024).
3. Emerging Role of Non-crystalline Electrolytes in Solid-State Battery Research. Frontiers in Energy Research (2020).
4. Physical Vapor Deposition in Solid‐State Battery Development: From Materials to Devices. Advanced Science (2021).
5. Chemical Vapor Deposition of Lithium Phosphate Thin-Films for 3D All-Solid-State Li-Ion Batteries. Journal of The Electrochemical Society (2014).
6. All‐Solid‐State Thin Film μ‐Batteries for Microelectronics. Advanced Science (2021).
7. Pulsed Laser Deposited Films for Microbatteries. Coatings (2019).