Lithium-Sulfur · SPAN Family
SPAN & SSPN, end to end.
Two lithium-sulfur cathodes, every form: SPAN and high-sulfur SSPN powders, electrode sheets, in-stock dry pouch cells, and made-to-spec cells. From one US-based partner.
One partner, powder to cell
Why SPAN
The breakout cathode of the lithium-sulfur boom
Lithium-sulfur promises 2 to 3× the energy density of lithium-ion, but elemental sulfur fights the polysulfide “shuttle.” SPAN (sulfurized polyacrylonitrile) binds sulfur into a conductive polymer, suppressing the shuttle and working with standard carbonate electrolytes. SSPN takes it further, pushing sulfur content far higher for more capacity.
Two Cathodes
SPAN vs SSPN
SPAN is the shuttle-suppressing workhorse at ~50% sulfur. SSPN is the high-energy upgrade, combining S90D polymer sulfur with SPAN to reach >79% sulfur while keeping the shuttle in check.
| SPAN | SSPN | |
|---|---|---|
| Sulfur content | ~50 wt% | >79 wt% |
| Composition | Sulfurized polyacrylonitrile | S90D polymer sulfur + SPAN |
| Strength | Stable, carbonate-compatible | High capacity, 500+ Wh/kg target |
| Best for | Repeatable Li-S R&D | High-energy aviation, UAV, eVTOL, defense |
One-Stop Supply
From powder to custom cells
Cathode Powder
SPAN Cathode Powder
Ultra-high-performance sulfurized polyacrylonitrile (~50% sulfur), ready for slurry and coating. Consistent, repeatable material from a single research group to pilot-scale runs.
- ~50% sulfur
- Carbonate-compatible
- Research to scale
High-Sulfur Cathode
SSPN Composite Cathode Powder
The high-energy upgrade: S90D polymer sulfur combined with SPAN for >79% sulfur content, a fine D50 of ~7 µm, ultra-low metal impurities, and a 500+ Wh/kg cell target — built for aviation, UAV, eVTOL, and defense.
- >79% sulfur
- 500+ Wh/kg target
- Aviation & defense
Electrodes
Electrode Sheets
Pre-coated electrodes that skip the slurry-and-coating step, available in both SPAN and SSPN. SPAN areal loading is fully customizable, high or low. SSPN electrode sheets are made to order — talk to us for specs.
- SPAN & SSPN
- Custom loading
- Coating-ready
Dry Cells
Dry Pouch Cells
Ready-to-test SPAN dry pouch cells, with a standard format in stock for fast turnaround. SSPN dry pouch cells are available too — contact us for the spec that fits your project.
- SPAN & SSPN
- In stock
- Custom builds
Custom
Custom SPAN / SSPN Cells
Beyond the catalog: tell us the chemistry, format, and targets, and we develop SPAN- or SSPN-system cells to your spec. A one-stop path for the whole cell, not just the parts.
- Made to spec
- One-stop
- Pilot-ready
Which do you need?
Match the material and form to where you are.
| You are… | Start with | Why |
|---|---|---|
| Building repeatable Li-S R&D cells | SPAN powder | Stable, carbonate-compatible, easy to coat |
| Chasing maximum energy density | SSPN powder | >79% sulfur, 500+ Wh/kg target |
| Skipping coating, testing fast | Electrode sheets | Drop-in SPAN or SSPN electrodes |
| Benchmarking cell performance | Dry pouch cells | Real cells, SPAN in stock, SSPN to order |
| Scaling a specific design | Custom cells | Made to your chemistry, format, and targets |
Why source SPAN family from Xnergy
Get SPAN or SSPN, in whatever form you need.
Tell us your stage and target. We’ll point you to the right material, send a sample, or scope a custom cell — including SSPN electrodes and cells made to order.
Frequently asked questions
What is SPAN cathode?
SPAN (sulfurized polyacrylonitrile) is a lithium-sulfur cathode that binds sulfur into a conductive polymer matrix, suppressing the polysulfide shuttle and enabling standard carbonate electrolytes for repeatable Li-S cells. It contains roughly 50% sulfur.
What is SSPN, and how is it different from SPAN?
SSPN is a composite cathode that combines S90D polymer sulfur with SPAN to reach over 79% sulfur, far above standard SPAN’s ~50%. That raises gravimetric capacity toward a 500+ Wh/kg cell target while keeping SPAN’s polysulfide-suppression behavior.
Which should I choose, SPAN or SSPN?
Choose SPAN for stable, repeatable Li-S R&D and easy coating. Choose SSPN when you need maximum energy density for aviation, UAV, eVTOL, or defense applications.
Do you offer SSPN electrode sheets and dry pouch cells?
Yes. SSPN is available as powder, electrode sheets, and dry pouch cells. Sheet and cell specs are made to order — contact us with your requirement and we’ll quote it.
Can you customize the SPAN electrode loading?
Yes. SPAN electrode sheets are made to your areal loading, both high and low, to match your cell design and test plan.
Do you make finished batteries?
We supply SPAN and SSPN materials and made-to-spec cells — powder, electrodes, dry pouch cells, and custom cell development — rather than packaged consumer battery products.
Xnergy Materials · US-based battery materials & cell development · xnergy.us