Peer-Reviewed Paper Dissects Hina's Mass-Produced Cell
The evaluation of sodium-ion batteries has moved from commentary to measurement. The peer-reviewed journal Cell Reports Physical Science(June 2026, open access) published a postmortem analysis and electrochemical testing of Hina Battery's most commercialized sodium-ion battery. Its conclusion was that the cell is comparable to state-of-the-art lithium-ion batteries in both performance and manufacturing quality. Independent academic data has overturned the old view that sodium-ion is cheap but visibly lower in quality.
What Li-ion-Class Means: 5.3% Manufacturing Variation
The key number is manufacturing quality. According to the paper, impedance variation across 120 cells was only 5.3%, indicating strong uniformity in mass production. Electrochemical performance was also solid: capacity remained above 100% at 4C(25C), while usable discharge energy exceeded 80% even at -20C(56% in the charging direction). Structurally, the paper identified a tabless double-aluminum architecture and a new cathode composition, NaCu1/9Ni2/9Fe1/3Mn1/3O2, designed to spatially separate copper from the other transition metals inside each particle.
The Current Point Is 110Wh/kg: Density Limits and Fit
The limits are also clear. The commercial 1.2Ah 18650 cell analyzed in the paper has an energy density of 110Wh/kg(33.2 x 140mm, 270g, AC internal resistance <=3mOhm). It still trails lithium-ion on energy per weight and volume, leaving a disadvantage for EVs that need long range. Adoption will start in areas where low cost, low-temperature performance, and the demonstrated mass-production quality matter most. Hina itself defines six application areas: electric bicycles, low-speed EVs, telecom base stations, data centers, residential storage, and grid storage. In March 2026, it completed grid connection of a sodium-ion storage system for a distribution grid in Guilin, Guangxi.
Implications for Procurement and Design
For procurement teams, a second battery option less exposed to lithium price volatility is becoming a practical candidate on quality as well. For designers, the question becomes how far lower density can be absorbed through pack architecture and cell format. This should be read less as a one-off news item and more as a sign that Chinese sodium-ion suppliers are starting to clear the mass-production quality barrier.
Manufacturing quality
Impedance variation across 120 cells was 5.3%. The peer-reviewed paper assessed manufacturing quality as comparable to state-of-the-art Li-ion.
Energy density
Commercial 18650 cells reached 110Wh/kg. This is lower than Li-ion, so adoption starts in stationary, low-temperature, and low-cost applications.
Deployment stage
Hina defines six application areas and had already grid-connected Na-ion storage for grid use in March 2026.