Sodium is the twelfth most abundant element on earth and lithium roughly the thirty-third, and for a while that arithmetic looked like the next great battery story. China led it. In April 2025 CATL launched a sodium-ion brand, Naxtra, with genuinely striking specifications: about 175 watt-hours per kilogram, the highest yet for a sodium cell and close to lithium iron phosphate, retention of 90% of its power at minus 40 degrees, and a life beyond 10,000 cycles.[1]
These are not laboratory numbers. Naxtra became the first sodium-ion cell to pass China’s national GB 38031-2025 safety standard, with mass production slated for December 2025 and broader deployment through 2026.[2] On the grid side, HiNa Battery brought a 100 megawatt-hour sodium-ion storage station online in Hubei in mid-2024, the first phase of a 200 MWh project and, at the time, the largest of its kind.[4] China holds an estimated 95%-plus of announced global sodium-ion capacity to 2030.[3]
A battery that needs no lithium is only a bargain while lithium is dear. In 2022 it was; then the price fell by two-thirds.
Show as a table
| Series | Value |
|---|---|
| Sodium-ion (Naxtra) | 175Wh/kg |
| LFP | 205Wh/kg |
| Nickel-based | 255Wh/kg |
Source: reference [3] below.
The argument that collapsed
Here is the twist that keeps the story honest. Sodium-ion’s central promise was cost, cheap, abundant raw material undercutting lithium. But lithium prices remain roughly 70% below their 2022 peak, and the IEA is blunt that “current lithium price levels are not yet high enough for sodium-ion batteries to undercut LFP costs in most applications.”[3] The technology that was meant to win on price arrived just as its rival got cheap. Sodium also trails on energy density, about 175 Wh/kg against roughly 205 for LFP and 255 for nickel-based cells, and in 2025 its output was still well under 1% of lithium-ion’s.[3]
Why this is on our list
Sodium-ion is a case study in why a superior technology can stall on economics it does not control. The engineering is real and China owns it; the market timing is cruel. That does not kill the thesis, but it reprices it: sodium’s near-term home is where cold-weather performance, safety and cycle life matter more than the last few dollars per kilowatt-hour, grid storage, two-wheelers, cheap city cars, and its broad cost case is a leveraged bet on lithium prices recovering. We track it as optionality rather than an imminent displacement of lithium, and we watch one number above all: the lithium price that would flip the maths back in sodium’s favour.
| Ref | Publication | Date | Supports |
|---|---|---|---|
| [1] | CATL | Apr 2025 | Naxtra specifications: density, cold performance, cycle life |
| [2] | CarNewsChina | Sep 2025 | GB 38031-2025 safety pass and production timing |
| [3] | International Energy Agency | 2025 | Lithium price, cost comparison, density, capacity share |
| [4] | CnEVPost | Jul 2024 | HiNa's 100MWh grid storage station in Hubei |
References
- CATL, “Naxtra Battery Breakthrough & Dual-Power Architecture,” Apr 2025. Read source ↗
- CarNewsChina, “CATL’s Naxtra sodium-ion passes new national safety standards, ready for mass production,” Sep 2025. Read source ↗
- International Energy Agency, “Sodium-ion battery momentum grows, but challenges remain,” 2025. Read source ↗
- CnEVPost, “‘World’s largest’ sodium-ion battery energy storage project goes into operation in China,” Jul 2024. Read source ↗
Every source above is public and linked. This is a research brief from Singularity Dynamics; full briefings on this topic are available on request.