A sodium–sulfur battery reported in Nature reaches the 3.6-volt class at room temperature, addressing a longstanding voltage limitation for this chemistry. The result is a laboratory research cell—not a lithium-ion replacement or a commercially available storage system. Its headline performance and cost figures use research-specific measurement boundaries, so they should not be read as packaged-battery or installed-grid specifications.
What the new battery is—and what “lithium-free” means
Researchers led by teams at Shanghai Jiao Tong University and Fudan University reported the anode-free sodium–sulfur design in Nature on 7 January 2026. Rather than using lithium-ion chemistry, it stores charge through sodium and sulfur reactions. The paper presents the chemistry as a possible route toward grid storage and wearable electronics, not as a product already ready for either use. The study describes a 3.6 V-class cell that operates at room temperature.
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How the sulfur reaction works
The cathode reversibly converts sulfur (S) and sulfur tetrachloride (SCl4). In one configuration, the sulfur cathode incorporates a bismuth-coordinated covalent organic framework catalyst, called Bi-COF. The electrolyte contains sodium dicyanamide (NaDCA) and a chloroaluminate component; the paper’s extended data specifies 8 M AlCl3 and 4.5 M NaDCA in SOCl2. The authors report that this electrolyte supports both sulfur conversion and sodium plating and stripping. The paper also describes a dry-coated sulfur cathode and fiber-shaped battery demonstrations, which remain research prototypes.
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The cell starts without a preloaded sodium-metal anode. During charging, sodium plates onto the current collector; during discharge, it strips back off. “Anode-free” therefore describes the cell’s starting construction, not an absence of sodium metal throughout operation.
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What the performance numbers actually measure
The paper reports high maximum figures, but their denominator matters. The energy and power values below are calculated using total electrode mass—the cathode and anode—not the mass of a finished battery or an installed storage system. The paper’s abstract gives the 1,198 Wh/kg energy and 23,773 W/kg power maxima on that basis.
| Reported figure | What it applies to | How to interpret it |
|---|---|---|
| 3.6 V-class | The reported sodium–sulfur cell | The voltage class reported by Geng et al. in Nature in 2026; it is not a packaged-system specification. |
| 1,198 Wh/kg maximum energy density | Total electrode mass, including cathode and anode | A laboratory electrode-mass-basis figure, not the energy density of a complete battery pack. |
| 23,773 W/kg maximum power density | Total electrode mass, including cathode and anode | A laboratory electrode-mass-basis figure, not a system-level power rating. |
| 2,021 Wh/kg maximum energy density | Bi-COF/S cathode configuration, calculated using total electrode mass | A maximum for that configuration, not a packaged-cell or installed-system measurement. |
| US$5.03/kWh estimated cost | Authors’ estimate | Not a quoted market price or validated manufacturing or installation cost. |
A finished battery and a grid installation also need components and infrastructure that electrode-mass calculations do not capture, including electrolyte, casing, current collectors, controls and balance of plant. The cited sources do not establish packaged-system performance or a validated commercial system price. The reported cost estimate therefore cannot show, by itself, that electricity storage using this chemistry will be ultra-cheap in practice.
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- Scope of application: Used for energy storage battery electrodes, thin flow batteries, lithium batteries, sodium sulfur monomer batteries, fuel cell MFC, etc
- The product has uniform thickness, stable performance, and can increase the charging and discharging current density by more than twice. It has good flatness, low resistance, and can improve voltage and energy efficiency by more than 30%. Moreover, there is no attenuation of energy efficiency during long-term charging and discharging processes.
- The product has uniform thickness, stable performance, and can increase the charging and discharging current density by more than twice. It has good flatness, low resistance, and can improve voltage and energy efficiency by more than 30%. Moreover, there is no attenuation of energy efficiency during long-term charging and discharging processes.
Why the voltage result matters—and what it does not prove
Earlier room-temperature sodium–sulfur cells have been constrained by low voltage and the need for excess sodium metal, according to the study and Chemistry World’s coverage. Conventional high-temperature sodium–sulfur batteries operate under different conditions, so their existence does not mean this room-temperature design has already solved the same engineering problems at commercial scale.
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Reaching the 3.6 V class is a meaningful laboratory result for the reported chemistry. It does not establish a drop-in replacement for lithium-ion cells: the cited sources do not provide matched, system-level comparisons of energy density, delivered cost, cycle life, efficiency, safety, operating conditions or commercial availability. Those are the measures needed to judge competing products or grid-storage options fairly.
What could stand in the way of scale-up
One unresolved challenge is the chemistry that makes the result possible. Chemistry World reports that University of Limerick researcher Kevin Ryan, who was not involved in the study, flagged the corrosiveness of the chloroaluminate electrolyte and the need to maintain the stability of SCl4, the charged sulfur product. The study’s laboratory performance does not settle how those materials would be managed reliably in production and long-term operation.
Manufacturing a robust cell would also require the promising electrode-level results to translate into performance and cost at the complete-cell and system levels. The paper reports a dry-coated cathode and fiber-shaped demonstrations, but these experiments do not establish a production line, wearable product, utility-scale installation or commercial supply chain.
Rank #4
- Product name:Sulfur-doped multi-walled carbon nanotubes, S-MWCNTs
- Purity: >98wt%
- Diameter: 10-30nm
- Length: 2-20μm
- Appearance: Black powder
Is it available, and when might products arrive?
No commercial cell or storage system is established by the cited sources. In February 2026, Chemistry World reported Hao Sun’s forecast of small-scale battery products in about three years and possible commercial products within five years, conditional on progress. Those were forward-looking estimates, not confirmed launch dates; the sources do not establish that products are currently available.
How to judge future claims about this chemistry
When a later announcement compares this battery with lithium-ion or other sodium-based storage, check that the figures use the same boundaries and operating assumptions. A useful comparison should specify:
Best Value
- Scope of application: Used for energy storage battery electrodes, thin flow batteries, lithium batteries, sodium sulfur monomer batteries, fuel cell MFC, etc
- The product has uniform thickness, stable performance, and can increase the charging and discharging current density by more than twice. It has good flatness, low resistance, and can improve voltage and energy efficiency by more than 30%. Moreover, there is no attenuation of energy efficiency during long-term charging and discharging processes.
- The product has uniform thickness, stable performance, and can increase the charging and discharging current density by more than twice. It has good flatness, low resistance, and can improve voltage and energy efficiency by more than 30%. Moreover, there is no attenuation of energy efficiency during long-term charging and discharging processes.
- Energy and power: full-cell or system-level values, not only figures normalized to electrode mass.
- Cost: a delivered manufacturing or installation cost with a defined scale and system boundary, rather than an unvalidated estimate.
- Operation: cycle life, efficiency, temperature and other conditions under which results were measured.
- Safety and handling: how the electrolyte and sulfur-containing materials are contained and managed.
- Commercial readiness: evidence of manufacturability, supply chain, and actual product availability.
The available reports do not provide enough matched, system-level data to rank the new chemistry against commercial alternatives on those measures.
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