Sodium-ion Battery technology is moving closer to large-scale use, and UNIGRID Inc. now offers a design that can stay cool without mechanical cooling. The company partnered with Syntropic Power to commercialize its proprietary sodium chromium oxide, or NaCrO₂, cell technology across North America. Together, the companies are targeting 1 gigawatt-hour of deployments in 2027. As a result, this sodium-ion battery platform could support residential storage, virtual power plants, and large stationary grid systems.
Sodium-ion battery delivers high efficiency and cool operation
UNIGRID’s sodium-ion battery uses a chromium-based NCO cathode. This chemistry helps the cell deliver strong thermal stability and high power capability. More importantly, independent testing showed a rare and useful behavior during charging. Instead of releasing excess heat, the 210Ah cells absorbed heat. Therefore, the battery can maintain safer operating temperatures without complex active cooling equipment.
The ISO-accredited Rochester Institute of Technology Battery Development Center tested the cells. The lab reported 97.9% cell-level round-trip energy efficiency. In addition, the cells delivered up to 218Ah of discharge capacity. These figures matter for grid storage because high efficiency reduces energy losses. Likewise, stable thermal behavior can lower system complexity and improve operating economics.
Sodium-ion battery cycle life supports grid-scale storage
UNIGRID’s sodium-ion battery also showed strong durability. The company said the cells retained more than 99% of capacity after 1,000 full discharge cycles. That result supports applications that need repeated charging and discharging. For example, utilities can use this type of storage to balance renewable generation, support peak demand, and improve grid flexibility.
Furthermore, the thermal profile adds another layer of value. Many energy storage systems need mechanical cooling to control heat buildup. However, UNIGRID’s NaCrO₂ design aims to reduce or remove that requirement. Consequently, developers can simplify system architecture. They can also save space and reduce parasitic energy use from cooling equipment.
Sodium-ion battery partnership targets 1 GWh in 2027
Syntropic Power and UNIGRID formed their partnership to move this chemistry into commercial products. Syntropic already received its first shipment of UNIGRID NCO cells. Now the company plans to integrate them into multiple storage platforms.
First, Syntropic will use the cells in Tenet. This is a wall-mounted energy storage system for residential, light-commercial, and virtual power plant applications. Next, the company will deploy the chemistry in GridSpan. GridSpan is a modular DC platform for larger energy projects. It supports discharge durations from 20 minutes to 20 hours. Because of that range, operators can tailor systems for fast-response power support or longer-duration energy shifting.
Matt Huber, Chief Technology Officer of Syntropic Power, said the chemistry combines high round-trip efficiency, high power capability, strong cycle life, and distinctive thermal safety behavior. According to Huber, those traits create a strong foundation for a GridSpan platform that can operate without active cooling.
Sodium-ion battery chemistry stands out in stationary energy storage
NaCrO₂ chemistry differs from other sodium-ion options, including sodium nickel iron manganese oxide and sodium iron pyrophosphate. UNIGRID says its NCO cathode offers an appealing mix of efficiency, power, durability, and thermal stability. That combination makes the technology especially relevant for stationary storage, where reliability and safety remain top priorities.
In addition, the battery uses abundant and widely distributed materials such as sodium and chromium. This material profile can support more stable supply planning for manufacturers and developers. As demand for energy storage grows in 2026, supply flexibility becomes increasingly important for large deployments.
Sodium-ion battery certifications and readiness
UNIGRID also said the cells secured key safety and transport certifications. These approvals support commercial shipping and system integration. Therefore, the technology has moved beyond lab performance claims and into a more practical stage of deployment readiness.
This progress arrives at a key moment for the energy sector. AI data centers, electrification, and grid modernization continue to increase electricity demand. At the same time, operators want storage systems that perform efficiently in demanding environments. UNIGRID’s sodium-ion battery answers that need with high efficiency, strong cycle life, and a cooling-light design.
Why this sodium-ion battery matters in 2026
In 2026, grid operators need storage that is efficient, scalable, and easy to integrate. UNIGRID’s sodium-ion battery checks many of those boxes. It offers 97.9% round-trip efficiency, more than 99% capacity retention after 1,000 cycles, and 210Ah cells that can discharge up to 218Ah. Most notably, it absorbs heat during charging, which supports operation without mechanical cooling.
That feature could make a real difference in residential systems, virtual power plants, and grid-scale installations. If commercialization proceeds as planned, this sodium-ion battery could become an important option for North American stationary storage projects in 2027 and beyond.
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