Technical details for solid electrolytes
Enabling high-performing batteries
Performance data
| General information | |
|---|---|
| Material class | Silicates Na₅RSi₄O₁₂ (R = rare earth) |
| Production process | Glass-ceramic process (melting, ceramization) and powder processing |
| Electric properties | |
|---|---|
| Na-conductivity, total (at 25 °C)1 | > 1 · 10⁻³ S/cm |
| Electronic conductivity¹ | < 1 · 10⁻⁹ S/cm |
| Activation energy | 0.3 eV – 0.35 eV |
| (Electro-) chemical properties | |
|---|---|
| (Electro-) chemical stability² |
Stable against Na-metal |
| Interface resistance to Na2 |
< 50 Ω · cm² |
| Other characteristics | |
|---|---|
| Bulk density | ~ 3.1 g/cm³ |
| Powder particle size | Standard D₅₀: 2–3 µm (other sizes on request) |
| Sintering temperature | 950 °C – 1,050 °C |
Standard milling provides the following typical particle size distribution.
Other distributions available on request.
Figure 1: Volume-weighted particle size distribution, here: D₅₀ = 2.4 µm
XRD analysis shows a large fraction of crystalline Na₅RSi₄O₁₂.
Figure 2: X-ray diffraction pattern of SCHOTT material (light blue)
and Na₅RSi₄O₁₂ reference spectrum (dark blue)³
1. Conductivity of sintered pellet. Relative density > 95%
2. No visual distinctive features in material cross section and stable interfacial resistance over time when contacted with molten Na
3. Source: Maksimov, B.A., Kharitonov, Y.A., Belov, N.V. “Crystal structure of the Na-Y meta-slicate Na₅Y-Si₄O₁₂” (in English translation). Sov. Phys. Dokl. 18, 763–765 (1974)
Please note: All values are indicative only.
Dr. Niko Schultz
Senior Project Manager New Ventures