Key News Fact Summary
CATL announced at a supplier conference in Ningde, Fujian Province, China on December 28, 2025 that it will deploy sodium-ion batteries at large scale throughout 2026.
The application fields were specified as battery swapping systems, passenger vehicles, commercial vehicles, and energy storage systems (ESS).
The disclosed energy density is up to about 175 Wh/kg, and it was introduced as the first sodium-ion battery to pass China’s EV traction battery safety standard GB 38031-2025 (primary source: CATL supplier conference announcement, cross-confirmed through secondary reporting).
Detailed specifications such as the exact cell format, capacity, and mass-production line location remain items requiring confirmation (undisclosed).
Mechanism-Perspective Impact Analysis
Unlike lithium-ion, sodium-ion cells can apply an aluminum current collector to the anode as well, resulting in different material stiffness and elongation compared to copper foil (Cu Foil).
This means the winding/stacking tension control parameters must be reset, and the tension profile of an existing lithium-ion line cannot be transplanted as-is.
Since the electrolyte also uses a sodium salt series instead of a lithium salt, there is a possibility that the chemically resistant components (gaskets, piping materials) of the electrolyte filling equipment will need to be reviewed (estimate; exact electrolyte composition undisclosed).
For mass deployment to actually occur, equipment flexibility to convert existing lithium-ion lines to dual-use for sodium-ion is key, which could also translate into dual-use line order opportunities for domestic equipment makers.
Spec Comparison Table
| Item | Lithium-Ion (LFP basis) | Sodium-Ion (CATL Announcement) |
|---|---|---|
| Energy Density | Approx. 160–180 Wh/kg | Up to 175 Wh/kg (announced value) |
| Anode Current Collector | Copper foil (Cu) | Aluminum foil (Al, estimated) |
| Safety Standard Compliance | Multiple models pass GB 38031-2025 | Passes GB 38031-2025 (introduced as first case) |
| Application Fields | EV/ESS broadly | Battery swap, commercial vehicles, ESS prioritized |
| Mass Production Timing | Already in mass production | Targeting large-scale deployment in 2026 |
One-Line Summary
CATL’s sodium-ion mass-deployment declaration is, before cell chemistry, a matter that first requires equipment re-verification of the winding tension and electrolyte filling systems.