| Feature | Details | |-------------|-------------| | Crystal purity | Grown via floating‑zone laser melting, yielding < 10 ppm impurity levels. | | Ionic conductivity | 5 mS cm⁻¹ at 25 °C; activation energy 0.18 eV (vs. 0.3–0.4 eV for earlier Na‑NASICON). | | Electrochemical stability window | 2.8 V vs. Na/Na⁺ (stable up to 4.5 V vs. Na metal). | | Mechanical robustness | Young’s modulus ≈ 85 GPa; can withstand > 1 % strain without fracture. | | Processability | Can be thin‑slab‑pressed to 20 µm thickness, enabling high‑energy‑density cell designs. | | Compatibility | Works with Na‑metal anodes, Na₃V₂(PO₄)₂F₃ cathodes, and emerging prussian‑blue‑derived cathodes. |
| Sector | Benefit | |------------|-------------| | Grid‑scale storage | Lower material cost → ≤ $50 kWh⁻¹ for 10‑year lifetime, making 100 MW·h installations financially viable. | | Electric‑Vehicle market | Safe solid‑state design reduces fire risk → simplified thermal‑management. | | Stationary renewable integration | High‑temperature tolerance (up to 60 °C) → minimal performance loss in desert installations. | | Recycling & sustainability | No toxic fluorinated liquids; fully recyclable ceramic component. | SONE-071
If commercialized within the next 3‑4 years, SONE‑071 could disrupt the battery supply chain by shifting a significant share of new storage projects from Li‑ion to Na‑based solid‑state systems. | NFR # | Requirement | |-------|-------------| |
| NFR # | Requirement | |-------|-------------| | NFR‑01 | Scalability – Scheduler must support up to 500k active schedules and 10 M deliveries per day. Use partitioned tables + sharded Redis for throttling counters. | | NFR‑02 | Availability – 99.9 % SLA for the Scheduler API (5 xx errors < 0.1 %). Deploy across two AZs. | | NFR‑03 | Latency – API response < 200 ms for CRUD ops; delivery worker latency < 5 s from scheduled time to provider call. | | NFR‑04 | Security – Data at rest encrypted (AES‑256); transport TLS 1.2+. Auditable actions stored immutably (WORM). | | NFR‑05 | Compliance – Support GDPR “right to be forgotten”: deleting a user must also purge any pending scheduled notifications for that user. | | NFR‑06 | Observability – Structured logs (JSON) with correlation IDs; tracing via OpenTelemetry. | | NFR‑07 | Testing – 80 % unit coverage, 70 % integration coverage, end‑to‑end UI tests with Cypress. | | NFR‑08 | Performance – Bulk audience resolution (≤ 10 k users per batch) must complete in < 2 s. | 200 ms for CRUD ops