Sodium-ion batteries (Na-Ion):
A revolution for the Ukrainian winter?
The world of industrial energy storage is on the verge of a paradigm shift. Lithium Iron Phosphate (LiFePO4) (LiFePO4) has dominated the past decade, but critical mineral shortages, lithium price volatility and the physical limitations of low-temperature operation have opened the door to a fundamentally different chemistry -- sodium-ion (Na-Ion). For the Ukrainian industrial sector, where BESS are often located in unheated containers and workshops, this technology can become a decisive factor in energy security.
What is Na-Ion and why is it important?
Sodium-ion batteries work on the same electrochemical principle as lithium-ion batteries - the "rocking chair" mechanism, where ions migrate between the anode and cathode through the electrolyte during charge and discharge. Key difference: Instead of lithium ions (Li+), sodium ions (Na+) are used. Sodium is the 6th most abundant element on Earth. In fact, its source is ordinary table salt (NaCl), which makes the raw material ten times cheaper and geopolitically more accessible than lithium.
Industrial giants such as CATL (China), Northvolt (Sweden), HiNa Battery (China), Faradion (Great Britain, now Reliance Industries), have already started mass production. BYD integrates Na-Ion cells into its budget electric car Seagull. This is not a laboratory concept - it is an industrial reality that is actively entering the B2B sector of energy storage.
"Home advantage of Na-Ion for Ukraine is operation at -20 C with preservation of 90% capacity. Lithium in such conditions loses up to 50% or requires energy-consuming heating, which eats up part of the stored energy." -- Chief Engineer, BESS Ukraine.
How Na-Ion Works: Chemistry in Simple Words
Despite the similarity of the principle of operation of lithium-ion cells, sodium-ion batteries use fundamentally different materials at each level of construction. This is due to the fact that the sodium ion is larger than the lithium ion (1.02 A versus 0.76 A), which requires adaptation of the crystal structures.
Cathode materials
There are three main classes of cathode materials for Na-Ion:
- Layered oxides (Layered Oxides): Structure similar to NMC in lithium batteries, but of sodium. The formula is NaxMO2, where M is a transition metal (Fe, Mn, Ni, Cu). CATL uses exactly this type in its AB series. The advantage is a high specific capacity (up to 160 mA*h/g).
- Berlin blue (Prussian Blue Analogues, PBA): A class of cyanide coordination compounds with an open framework structure that is ideal for the intercalation of large sodium ions. Company Name Natron Energy (USA) specializes in PBA cathodes. The advantage is extremely fast charging (up to 8C) and long life (up to 50,000 cycles in special configurations).
- Polyanionic compounds (NASICON): For example, Na3V2(PO4)3. An analogue of LiFePO4, but for sodium. High thermal stability and safety. The disadvantage is lower energy consumption.
Anode material: Hard Carbon
Unlike lithium-ion batteries, where the standard anode is graphite, Na-Ion uses so-called "hard carbon". Graphite is not suitable for sodium because the distance between the layers of the crystal lattice is too small. Solid carbon is produced from biomass (coconut shells, wood shavings, corn stalks) by pyrolysis at 1000-1400 C. It has an amorphous structure of large pores that easily accommodate sodium ions.
For Ukraine, this creates an additional opportunity: theoretically, the anode material can be produced from local agricultural raw materials, creating a local supply chain.
Electrolyte and current collectors
Na-Ion uses solutions of sodium salts (NaPF6 or NaClO4) in organic carbonate solvents -- similar to lithium, but with a different salt. A critical design advantage: instead of copper foil (Cu, ~$8/kg) aluminum (Al, ~$2.5/kg) can be used on the anode side, since sodium does not form alloys of aluminum at low potentials, unlike lithium. This reduces the cost and weight of the cell.
Chronology of the development of Na-Ion
Real industrial projects on Na-Ion
Sodium-ion BESSs are already operating in real industrial conditions. Below are the most significant projects confirmed for the beginning of 2026 years:
CATL / China Southern Power Grid (Guizhou, China)
The first industrial Na-Ion BESS for balancing the power grid with a capacity of 10 MW / 20 MW*h. The system is connected to the distribution network of Guizhou province and is used for peak shaving and frequency regulation. According to official CATL data, the system operates with an availability ratio of over 98%.
HiNa Battery / China Tower (telecom, China)
China Tower -- the largest telecom tower operator in the world -- has deployed more than 5,000 Na-Ion battery modules at base stations in extreme climate provinces (Inner Mongolia, Heilongjiang). The operating temperature is from -40 C to +60 C. Na-Ion was chosen precisely because of the lack of need for heating systems, which is critical for autonomous stations without mains power.
Natron Energy / data centers (USA)
Natron Energy supplies Na-Ion UPS systems based on PBA cathodes for data centers. The key advantage is a resource of up to 50,000 cycles and the ability to discharge at a capacity of 8C (full discharge in 7.5 minutes). This makes them ideal for UPS where the battery can be cycled dozens of times a day.
Pilot projects in Europe
Sweden's Northvolt and France's Tiamat Energy (spin-off of CNRS) announced pilot BESS projects for industrial facilities in Scandinavia and France for 2025-2026. The main focus is the integration of renewable sources (wind and solar parks) in climatic zones with temperatures below -20 C.
Comparison of LiFePO4, NMC and lead
To fully understand Na-Ion's positioning, here's an extended comparison of all the major chemistries used in industrial energy storage:
| Characteristic | Na-Ion | LiFePO4 | NMC | Lead (AGM) |
|---|---|---|---|---|
| Specific energy (W*h/kg) | 120-200 | 140-180 | 200-280 | 30-50 |
| Resource (cycles up to 80%) | 3 000 - 6 000 | 6 000 - 10 000 | 2 000 - 4 000 | 300 - 500 |
| Price ($/kWh, forecast 2026) | $40-50 | $80-100 | $100-130 | $80-120 |
| Work in the cold (-20 C) | 90% capacity | 50-60% capacity | 50-70% capacity | 40-50% capacity |
| Operating temperature range | -40 C .. +60 C | -20 C .. +55 C | -20 C .. +45 C | -20 C .. +50 C |
| Safe storage | 0 V (full discharge) | 2.5 V minimum | 2.5 V minimum | Requires recharging |
| Fire safety | Minimum (does not light) | low | High (thermal runaway) | Medium (highlight H2) |
| Self-discharge (%/month) | 3-5% | 1-3% | 2-5% | 5-15% |
| The weight of the system is 100 kW*h | 500-800 kg | 550-700 kg | 350-500 kg | 2000-3300 kg |
| Geopolitical risk of raw materials | Minimal (sodium everywhere) | High (Lithium, China/Chile) | Very high (Co, Ni, Li) | Medium (lead) |
Visualization: Specific energy (W*h/kg)
Storage capacity at different temperatures
One of the key advantages of Na-Ion is stable operation at extreme temperatures. Below is a comparison of the storage capacity of Na-Ion and LiFePO4 at different temperature conditions:
Prospects for Ukrainian business
In the conditions of systematic blackouts and the location of BESS in unheated premises - workshops, warehouses, containers under the open sky - sodium-ion chemistry provides a decisive advantage. You don't need to waste the precious stored energy of the battery on its own heating in winter, which for LiFePO4 can be 5-15% of the total capacity in the cold season.
Key benefits of implementation
- CAPEX reduction by 30-40%: The cost of Na-Ion cells in 2026 is projected at $40-50/kWh vs $80-100 for LiFePO4. For a typical 500 kWh industrial project, this is a difference of $20,000 - $30,000.
- Fast charging (3C-4C): Full charge in 15-20 minutes. Critical for scenarios of short "windows" of network power availability during planned and emergency shutdowns.
- Security of logistics: Batteries are transported completely discharged (0 Volts), which makes it impossible to catch fire during delivery. This simplifies customs clearance and cargo insurance -- an essential factor for importing to Ukraine.
- No need for HVAC: Na-Ion container BESSs work without air conditioning and heating systems in the range of -40..+60 C. This reduces the actual consumption of the system by 8-12% and lowers maintenance costs.
- Compatibility of existing PCS/BMS: Most inverters and control systems (Sungrow, Deye, GoodWe) already have or are preparing firmware updates for the operation of Na-Ion cells. The cell voltage (2.8-3.7 V) is close to LiFePO4 (2.5-3.65 V).
When will Na-Ion become a standard in Ukraine?
Analyzing the current state of the market and technological readiness, it is possible to distinguish three horizons for the introduction of Na-Ion in the Ukrainian B2B sector:
2025-2026: Pilot projects
The first pilot Na-Ion BESS in Ukraine through direct import of CATL/HiNa cells. Limited availability, requires BMS engineering adaptation. Suitable for R&D-oriented companies and projects financed by international donors.
2027-2028: Commercial availability
Na-Ion modules will appear in the catalogs of major Chinese and European integrators. The price will reach the parity of LiFePO4 or below. The first systems certified in Ukraine. Hybrid AB Pack solutions (Na-Ion + LiFePO4).
2029-2030: Mass implementation
Na-Ion is becoming the standard choice for stationary BESS in climate zones of cold winters. Local storage and service in Ukraine. The potential of local production of anode material (hard carbon) of Ukrainian biomass.
Factors affecting the speed of implementation in Ukraine
- Regulatory environment: BESS certification standards in Ukraine are currently tied to lithium-ion technologies. It is necessary to adapt the regulatory framework of the NKREC for new chemicals.
- Logistics chain: The main manufacturers of Na-Ion cells are located in China. Sea logistics through Odesa or railway through Poland - both routes need to be adjusted for a new type of cargo.
- Personnel and competences: Engineers working at BESS in Ukraine are trained on LiFePO4. Retraining for operation of Na-Ion BMS and other charge/discharge parameters requires 2-3 months.
- Financing: International programs (USAID, EBRD, EIB) are actively looking for innovative energy projects for financing. Na-Ion BESS can receive preferential financing as a "green innovation".
Conclusions of BESS Ukraine
Today, LiFePO4 remains the "gold standard" for industrial BESS due to its proven life (10,000+ cycles), developed supply infrastructure, and stock availability. However, for projects of implementation in 2026+, for objects of strict temperature conditions (BESS containers, open sites, unheated warehouses) or for scenarios of limited budget, we recommend:
- Consider AB Pack hybrid systems (Na-Ion for peak loads + LiFePO4 for base cycle).
- Design with consideration future transition to Na-Ion (universal racks, BMS-ready inverters).
- Inquireat is our pilot project of Na-Ion CATL or HiNa cells for your facility.
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Frequently Asked Questions about Na-Ion
Can LiFePO4 be replaced with Na-Ion in an already installed BESS?
Are Na-Ion batteries safe? Do they burn?
What is the real cost of a turnkey Na-Ion BESS system in 2026?
What makes Na-Ion better than classic lead batteries for backup power?
Are there any Ukrainian manufacturers of Na-Ion batteries or accessories?
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