GRID-SCALE
ENERGY STORAGE
REIMAGINED

The Aqueous Sulfur Battery combines PolyPlus’ Water Stable Protected Anode with proprietary aqueous sulfur cathode chemistry — delivering long-duration grid storage that is safer, cheaper, and free from critical minerals.

 

The grid storage market has a problem…

Lithium iron phosphate (LFP) batteries — predominantly manufactured in China — dominate the grid battery storage market. But LFP’s reliance on imported materials, fire safety liabilities, and degraded performance in temperature extremes leave the US grid exposed.

Introducing

Glass
Protected
Li Metal
Batteries

Thin
Lithium
Metal

Ultra-Thin
Conductive
Glass Separator

Metal Oxide
Cathode

Twice the Energy / Half the Size

More about Glass Protected Li Metal Batteries

Built for the utility grid.

The PolyPlus Li-ion/sulfur platform is designed from the ground up for multi-hour grid-scale battery energy storage systems (BESS) — where safety, cost, and cycle life matter most.
Utility-scale BESS
Multi-hour storage for transmission-connected utility systems, peak shaving, and grid frequency regulation.
Solar + Storage
Behind-the-meter and front-of-meter storage paired with renewable generation for 4–8 hour dispatch.
Defense & Resilience
Mission-critical energy storage where safety, domestic sourcing, and temperature tolerance are non-negotiable.
Underwater / Marine
Li-seawater primary batteries for long-endurance AUVs and subsea systems — proven at 10,000 psi.