Key points in this article
A sodium star rises
The battery track gains a 'sodium' star. In Apr 2026 CATL announced at its tech day Q4 2026 mass production of sodium-ion cells, disclosing it cracked four hurdles—water control, hard-carbon gas, foil bonding, anode-free scaling; back in Feb, Changan+CATL's world-first sodium-ion production passenger car debuted, on sale mid-year, with BYD, Sunwoda and EVE all joining—sodium moves from 'backup' to 'mainstream'.
Why it breaks out
Why does sodium break out? First, cold tolerance: tests show >90% capacity at -40°C and stable discharge even at -50°C, directly solving northern winters' 'range halved, frozen dead' pain, while conventional Li often falls below 70% at -20°C. Second, resources and cost: sodium crustal abundance is 2.75% (400x lithium), China ~100% self-sufficient, immune to lithium's geo-price swings; Q1 2026 sodium cell cost fell to ¥0.35–0.40/Wh, within ¥0.1/Wh of LFP, 30%–40% below Li long-term. The clear weakness: ~175Wh/kg mass energy, below ternary Li, so today it fits sub-¥100k micro-cars, two-wheelers and cold regions.
Yantai's local boon
For a northern city like Yantai, sodium is a doorstep boon. Dongdian Huichong's community and public charging watches battery evolution's refuelling impact—sodium's cold adaptability means 'charges and discharges reliably' in severe winters, fitting Yantai's seasonal need; the 'sodium-lithium parallel' pattern tells operators not to bet one route. Owners needn't agonise 'sodium or lithium' now—use the car and stall well, and when sodium cars spread, a colder-proof, cheaper choice arrives naturally.