LLZTO Tantalum-doped Lithium Lanthanum Zirconium Oxygen Solid Electrolyte Sheet Li6.5La3Zr1.5Ta0.5O12 Battery Material
Material Overview
LLZTO (Li₆.₅La₃Zr₁.₅Ta₀.₅O₁₂) is a cubic-phase garnet-type oxide solid electrolyte with superior ionic conductivity (1.68×10−3 S/cm at 25°C) and exceptional electrochemical stability (0–5 V vs. Li⁺/Li). Its Ta doping stabilizes the cubic structure while suppressing lithium dendrite growth, making it ideal for lithium-metal batteries.
Key Properties
| Parameter |
Specification |
| Crystal Structure |
Cubic garnet (Ia-3d) |
| Density |
>95% theoretical (5.1 g/cm³) |
| Thickness Options |
50–300 μm (customizable) |
| Ionic Conductivity |
1.68×10−3 S/cm (25°C) |
| Activation Energy |
0.25–0.30 eV |
| Thermal Stability |
Up to 1000°C (melting point) |
Performance Highlights
-
Interface Engineering
- Forms stable SEI with Li metal (critical current density: 4.2 mA/cm²)
- Low interfacial resistance (<10 Ω·cm² with Sn:SnF₂ coating)
-
Mechanical Robustness
- Vickers hardness: 8–10 GPa
- Withstands >300 MPa assembly pressure
-
Battery Integration
- Compatible with NMC811 cathodes (181 mAh/g initial capacity)
- Stable cycling >3000 cycles (0.1C rate)
Applications
- All-Solid-State Lithium Batteries (ASSLBs)
- Lithium-Sulfur/Lithium-Air Batteries
- Hybrid Solid-Liquid Electrolyte Systems
Handling Notes
- Storage: Argon glovebox (O₂/H₂O <0.1 ppm) to prevent Li₂CO₃ formation
- Processing: Cold-press at 300–500 MPa for pellet formation
Note: Custom formulations (e.g., Ga-doped LLZTO) and thicknesses available for research-scale orders.
