Solid-State Electrolyte Development for Energy Storage Systems

Solid-state electrolytes replace flammable liquid electrolytes to enhance the safety and energy density of rechargeable batteries. They conduct ions through ceramic, glassy or polymer matrices, enabling compatibility with high-capacity electrodes and lithium-metal anodes. Major classes include oxide ceramics such as garnet-type Li7La3Zr2O12, sulphide electrolytes like Li10GeP2S12, and polymer-based systems. Advances focus on maximising room-temperature ionic conductivity, ensuring interfacial stability and suppressing lithium dendrite formation. Doping strategies, composite membranes and thin-film fabrication techniques have improved mechanical resilience and moisture tolerance, moving solid-state designs towards scalable production. The global drive for safer, higher-energy rechargeable technologies is propelling materials design, synthesis and interface engineering to deliver next-generation energy storage solutions.

Research from Nature Portfolio

Recent studies have shown that garnet ceramics doped with aliovalent cations can achieve ionic conductivities exceeding 1 mS cm–1 at 25 °C. Interface engineering, including the introduction of ultrathin oxide interlayers between lithium metal and ceramic electrolytes, has markedly improved interfacial stability, suppressing dendritic growth over extended cycling. Sulphide-based glass–ceramics have been refined through controlled crystallisation and surface passivation, yielding conductivities near those of liquid electrolytes while enhancing air stability. Moreover, polymer–ceramic composite films produced by advanced deposition methods combine high ionic transport with excellent mechanical properties, offering promising pathways for flexible solid-state cell architectures.

Research from all publishers

Outside the Nature portfolio, argyrodite sulphide electrolytes such as Li6PS5Cl have been optimised via halogen substitution and grain-boundary modification, reaching conductivities above 10 mS cm–1 and greatly reduced moisture sensitivity. Research on NASICON-type conductors, notably Li1.3Al0.3Ti1.7(PO4)3, has delivered dense ceramics through spark plasma sintering, resulting in enhanced conductivity and lower interfacial resistance with cathodes. In polymer electrolytes, novel block copolymers with tailored ion-conducting domains and ceramic nanoparticle fillers have achieved conductivities over 0.5 mS cm–1 at ambient temperature alongside improved mechanical robustness, advancing the feasibility of solid-state battery prototypes.

Solid-State Electrolyte Development for Energy Storage Systems publication trend

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

Technical terms

Solid-state electrolyte: Ion-conducting solid medium that replaces liquid electrolytes in batteries to improve safety and stability.

Ionic conductivity: Measure of ion transport rate through an electrolyte, expressed in siemens per centimetre (S cm–1).

Dendrite: Needle-like lithium deposit formed during cycling that can penetrate the electrolyte and cause short circuits.

Garnet electrolyte: Ceramic structure typified by Li7La3Zr2O12, noted for high ionic conductivity and chemical stability.

NASICON: Structure family of sodium (or lithium) superionic conductors based on a phosphate framework offering high ionic transport.

Argyrodite: Class of sulphide electrolytes with general formula Li6PS5X (X = Cl, Br, I), known for high conductivity and ease of synthesis.