Chinese sodium-ion batteries charge 90% in 4 minutes, reshaping EV economics

A laboratory breakthrough in China has produced something that could reshape how we think about powering electric vehicles and storing renewable energy: a quasi-solid electrolyte that lets sodium-ion batteries charge to 90 percent in just four minutes. The technology maintains its stability for 6,000 hours of operation—a crucial measure of durability that addresses one of the oldest problems in battery chemistry: the formation of dendrities.

Dendrities are the real villain in this story. During charging and discharging cycles, crystalline structures grow like microscopic needles on the battery's anode. Left unchecked, these needles pierce through the internal separator, causing short circuits, rapid degradation, and safety hazards. It's why lithium batteries have always had to choose between speed and longevity. The Chinese team's quasi-solid electrolyte works as both a physical and chemical barrier, suppressing this dendrite growth while allowing the ultrafast charging that has long seemed impossible. The trick lies in the electrode-electrolyte interface: the material maintains intimate contact with the electrodes while restricting the uncontrolled ion movement that creates dendrities in the first place.

Behind this development is HiNa Battery Technology, founded in 2017 and now one of the most visible players in China's sodium-ion ecosystem. The company has already moved beyond pure research. In April 2025, HiNa unveiled a sodium-ion battery solution for commercial vehicles with energy density above 165 watt-hours per kilogram, capable of full charge in 20 to 25 minutes, stable operation between minus 40 and 45 degrees Celsius, and more than 8,000 cycles of continuous rapid charging. That track record suggests the new four-minute technology isn't just a lab curiosity—it has a realistic path to manufacturing scale. HiNa's target applications span low-speed electric vehicles, lightweight mobility like e-bikes and scooters, urban cars, and stationary storage systems for power grids and renewable energy installations.

The competitive landscape matters here. CATL, the battery giant, pioneered industrial sodium-ion production with a focus on energy storage and lower-cost vehicles, announcing its first-generation sodium batteries in 2023 with 160 watt-hours per kilogram density and rapid-charge capability. BYD, while primarily committed to lithium iron phosphate chemistry, maintains parallel research programs in sodium-ion for specific market segments. HiNa's advantage is singular focus: the company has specialized exclusively in sodium from the start, giving it an edge in time-to-market and already-deployed commercial applications in light vehicles and storage systems.

The fundamental appeal of sodium-ion over lithium rests on three pillars. Sodium is roughly 1,000 times more abundant than lithium, which means raw material costs can drop 30 to 40 percent. Safety improves because sodium carries lower thermal risk. And performance in cold climates is superior—sodium batteries function better at sub-zero temperatures. The trade-off is energy density, which remains lower and limits use in long-range vehicles. But that limitation becomes irrelevant in urban delivery fleets, shared scooters, stationary backup systems, and short-hop city cars.

For founders building in electric mobility, energy storage, or battery-adjacent hardware, this development carries concrete strategic weight. If your current solution depends on lithium for short-range applications or stationary storage, the bill of materials could shrink significantly with sodium-ion, potentially by 30 to 40 percent. The energy density trade-off may be entirely acceptable for urban vehicles, delivery fleets, sharing scooters, or renewable backup systems. The four-minute charging technology is still in the laboratory phase, but HiNa's involvement suggests a realistic three-to-five-year window before initial commercial applications emerge. That timeline matters for capital raises and product roadmaps.

Sodium-ion is already moving beyond pure laboratory work. HiNa claims deployments in e-bikes, light vehicles, urban cars, and stationary storage systems. The technology remains in an early-adoption phase—industrialization is advancing, but market share and scale lag far behind lithium-ion. The most solid references from 2025 and 2026 point to initial deployments in specific niches where cost, safety, and cold-weather performance matter more than maximum energy density. If the four-minute quasi-solid electrolyte proves itself in real operating conditions, that transition could accelerate. The strategic question for founders isn't whether sodium will kill lithium—it won't. The real question is: in which use cases does sodium win today? The answer is becoming clearer.