Published: March 17, 2026
Summary: Composite materials combining MgO fibers with Lithium Lanthanum Zirconate (LLZO) enhance solid-state battery electrolytes. This improves mechanical strength and critical current density, preventing lithium dendrite growth for safer, more powerful batteries.
Applications:
- Solid-state battery electrolytes
- Electric vehicle batteries
- Portable electronics batteries
Advantages/Benefits:
- Increased mechanical strength
- Higher critical current density
- Suppressed lithium dendrite growth
- Cost-effective manufacturing
Background: Solid-state batteries require robust electrolytes for high energy density and safety. Thin, high-performance solid electrolytes are needed to enable their widespread adoption in various applications. However, current thin solid electrolytes, like LLZO, exhibit poor mechanical strength. This limitation hinders practical implementation, causing issues such as lithium dendrite growth and low critical current density.
Technology Overview: Scientists at Berkeley Lab have developed a composite material combining MgO fibers or nanopowders with Lithium Lanthanum Zirconate (LLZO) powder for solid-state battery components. The process involves mixing LLZO with MgO additives, tape casting, and sintering to create a fine, uniform microstructure with MgO localized at grain boundaries, reducing abnormal grain growth and inhibiting lithium dendrite formation.
The composite material has a fine, uniform microstructure, significantly increasing fracture strength and improving ionic paths. This enhanced mechanical integrity substantially increases critical current density, enabling higher power and preventing dendrite growth, crucial for battery safety.
The mechanical strength of the MgO-added LLZO was enhanced by more than 60% while maintaining high ionic conductivity (~1 × 10−4 S cm−1) at room temperature. Li symmetric cells using the MgO fiber–LLZO and MgO powder–LLZO exhibit up to three times higher critical current density than those of pure LLZO, and a solid-state full cell exhibits stable cycling performance.
Development Stage: TRL 4
Inventors:
Wooseok Go
Status: Patent pending
Opportunities: Available for licensing and / or collaborative research
For More Information:
Go, Wooseok et al. 2025. Investigation of MgO additives on microstructure and properties of thin LLZO electrolytes for all-solid-state batteries. Journal of Materials Chemistry, 24 Feb 2025. https://pubs.rsc.org/en/content/articlelanding/2025/ta/d4ta09002k
