Interfacial Engineering in Solid-State Lithium Metal Batteries

Solid-state lithium metal batteries hold promise for next-generation energy storage by combining high energy density with enhanced safety. Central to their performance is the interface between lithium metal electrodes and inorganic solid electrolytes, where poor contact, chemical instability and uneven current distribution can lead to high impedance, lithium dendrite formation and rapid failure. Interfacial engineering seeks to overcome these challenges through deliberate surface modifications, including artificial interlayers, coatings and composite buffers. Strategies range from lithiophilic surface treatments that improve wetting and ion transport, to electron‐blocking layers that prevent electronic leakage and dendritic growth. Advances in microstructural design—such as three-dimensional interlayers and guided nucleation templates—further enhance mechanical robustness and cycling stability. By tailoring chemical composition, morphology and electronic properties at the electrode/electrolyte junction, researchers aim to unlock the full potential of solid-state cells for electric vehicles, grid storage and portable electronics.

Research from Nature Portfolio

Recent work has demonstrated the efficacy of electron‐blocking shields formed in situ at the lithium–solid electrolyte interface. Flexible interfacial shields derived from substitution reactions enhance lithiophilicity, stabilise volume changes and introduce high electron‐tunnelling barriers, yielding stable cycling at current densities above 1 mA cm⁻² for hundreds of hours. Surface interlayers combining silver coatings with carbon-rich buffers have been shown to regulate lithium stripping and plating, prevent dendrite penetration and sustain over 800 cycles at moderate current densities without external pressure. More recently, potassium‐fluoride‐derived interlayers have been applied to garnet electrolytes, transforming on contact with molten lithium into composite KF/LiF layers that block electron leakage and suppress dendrite growth. When paired with tailored ionic liquids to wet high‐voltage cathodes, these cells exhibit multi‐thousand‐hour lifespans and capacity retentions above 70% at high rates.

Interfacial Engineering in Solid-State Lithium Metal Batteries publication trend

The graph below shows the total number of articles in interfacial engineering in solid-state lithium metal batteries across all publications each year (not limited to Nature Index journals).

Technical terms

Solid-state electrolyte: A non-liquid medium—often ceramic or glass—that conducts lithium ions while blocking electrons, enabling safer battery operation.

Interfacial resistance: The electrical and ionic impedance encountered at the junction between electrode and electrolyte, affecting power capability and efficiency.

Lithiophilicity: The affinity of a surface for lithium, crucial for uniform metal deposition and low-resistance contact.

Electron-blocking interlayer: A thin film or coating engineered to prevent electronic conduction across the interface, mitigating dendrite nucleation.

Critical current density (CCD): The maximum current beyond which lithium dendrites form, leading to short circuit and cell failure.

Lithium dendrites: Needle-like metal deposits that grow during plating, capable of piercing the electrolyte and causing internal short circuits.

References

1. A flexible electron-blocking interfacial shield for dendrite-free solid lithium metal batteries. Nature Communications (2021).
2. Surface engineering of inorganic solid-state electrolytes via interlayers strategy for developing long-cycling quasi-all-solid-state lithium batteries. Nature Communications (2023).
3. An electron-blocking interface for garnet-based quasi-solid-state lithium-metal batteries to improve lifespan. Nature Communications (2024).
4. Progress and perspective of interface design in garnet electrolyte‐based all‐solid‐state batteries. Carbon Energy (2021).
5. Mitigating Interfacial Mismatch between Lithium Metal and Garnet-Type Solid Electrolyte by Depositing Metal Nitride Lithiophilic Interlayer. ACS Applied Energy Materials (2022).
6. High-Power Hybrid Solid-State Lithium–Metal Batteries Enabled by Preferred Directional Lithium Growth Mechanism. ACS Energy Letters (2022).
7. Constructing a Superlithiophilic 3D Burr‐Microsphere Interface on Garnet for High‐Rate and Ultra‐Stable Solid‐State Li Batteries. Advanced Science (2023).