The gap

Every rechargeable battery in production today stores energy as a bulk chemical reaction. Lithium shuttles between cathodes and anodes, lead converts to sulfate and back, nickel and cadmium trade oxygen — and every one of them needs a physical separator to keep the two sides from shorting. The separator is a failure surface: it limits rate, degrades with cycling, adds cost, and sets a floor on thickness that no chemistry can eliminate.

More fundamentally, the stored energy has no identity. A battery reports its voltage and temperature, but how much charge remains is not tied to a stable property of the cell: state of charge is inferred from voltage curves, coulomb counting, or impedance, all of which drift over life. There is no cell whose bond-energy distribution gives a smooth, gradually declining discharge profile from which state of charge can be estimated directly from open-circuit voltage with high accuracy across the full capacity range.

The invention

A sealed, separator-free electrochemical cell where aluminum nanoparticles dispersed in a dual-domain proton-conducting carbon gel store energy through hydrogen surface chemisorption. Charge is retained by bulk-equipotential saturation rather than a physical barrier: the entire gel volume reaches and maintains the same electrostatic potential, and the amount of stored charge is proportional to the density of occupied hydrogen-binding sites across the metal nanoflake surfaces.

Because the charge is stored as electron-stabilized covalent metal-hydrogen bonds — each bond requiring a specific binding energy — the cell's open-circuit voltage is a direct function of the binding-energy distribution across the nanoflake population. The smooth discharge profile this produces lets state of charge be estimated directly from open-circuit voltage with high accuracy across the cell's capacity range.

The inventive step

Storing electrochemical energy as reversible covalent hydrogen–aluminum surface bonds in a proton-conducting carbon gel, where charge is retained by bulk-equipotential saturation across a separator-free architecture, the state of charge being carried by the saturation of the metal-hydrogen bond population and readable directly from open-circuit voltage, and the discharge voltage profile programmed by the composition of the metal nanoflake population.

The architecture admits embodiments ranging from small portable cells to large stationary cells for grid-scale and emergency-backup storage, and composes with the credentialed surfaces substrate elsewhere in the portfolio.