Sodium-ion gets a national roadmap in Korea and a contested carbon score
Serguey Asael Shinder2 min readTwo reports published on 29 and 30 September put sodium-ion batteries at the centre of two different arguments: industrial strategy and carbon footprint.
Korea bets on it to get back into storage. South Korea's battery technology roadmap, released on 22 September, targets sodium-ion cells of 160 Wh/kg by 2027 and 220 Wh/kg by 2030, with full commercialization in 2030 and energy storage and lower-cost EVs as the intended markets. The reasoning is market share: according to the International Energy Agency, lithium iron phosphate (LFP) makes up around 90% of storage deployments worldwide, and Chinese manufacturers dominate it, while Korean makers concentrated on high-nickel EV cells. The plan includes a research programme of about KRW 400 billion over 2027 to 2031, a production tax credit from 2027 and cooperation between LG Energy Solution, Samsung SDI and SK On on non-competitive specifications. pv magazine notes that sodium-ion today remains more expensive than LFP. Source: https://www.pv-magazine.com/2026/09/30/south-korea-marks-major-shift-to-sodium-ion-batteries-to-regain-market
The carbon case is not settled. A Chinese life cycle assessment based on on-site data from gigawatt-hour-scale factories puts a 1 kWh layered-oxide sodium-ion pack at 56.8 kg of CO₂ equivalent, 24.9% below the 75.5 kg for an LFP pack, with emissions in both driven by manufacturing electricity on a coal-heavy grid. A 2025 study by Fraunhofer and RWTH Aachen, also on factory data, found the reverse for cells: 75 to 87 kg for sodium-ion against 59 to 70 kg for LFP. The two measured different things, packs versus cells, and both stop at the factory gate, so neither accounts for how many cycles each battery delivers. Source: https://www.pv-magazine.com/2026/09/29/sodium-ion-packs-25-less-carbon-intensive-than-lfp-say-researchers
What connects them
Sodium-ion is being promoted for its supply chain and its cost trajectory, not because it is already cheaper or proven cleaner. For storage buyers the useful question is narrower than either report: what a sodium-ion system costs per kWh delivered over its life, on the grid where it is made. Until someone measures that on commercial products, the national target and the carbon claims are both forecasts.