New all-solid-state, rechargeable battery technology claims record energy density

October 19, 2012 // By Paul Buckley
Infinite Power Solutions, Inc. (IPS) has developed of a new all-solid-state rechargeable battery technology with low manufacturing costs and record energy density.

The innovative High Energy Cell (HEC) technology features a 4 V rechargeable chemistry that delivers high power, an ultra-low self-discharge rate and long life for permanent battery implementations. The ceramic-based HEC technology uses only low cost, high throughput, non-vacuum manufacturing processes, which is fundamentally different from the solid-state, thin-film batteries currently produced by IPS. The new HEC technology offers much higher cell capacity than existing thin-film technology, yet remains inherently safe and eco-friendly. The technology enables a new era of low cost, high capacity, small form-factor, rechargeable batteries in traditional battery formats such as coin cells, or custom shapes and sizes to serve medical, industrial and consumer electronics.

The HEC technology offers a fully packaged volumetric energy density of greater than 1,000 Wh/l, which is unprecedented for a 4 V rechargeable chemistry, especially when packaged in form factors that are smaller and thinner than today's coin cells.

As a figure of merit, HEC technology can produce a single cell capacity of 85 mAh per charge cycle in a 20 mm diameter round cell ~1mm thick. Such a cell exhibits a continuous current capability of 30 mA and a peak pulse current of up to 90 mA at 25°C. With a similar 3-cell stack connected in parallel and packaged within a traditional 20 mm diameter metal package like a coin cell, a capacity of 250 mAh per charge cycle can be achieved within a 3.2 mm standard thickness, while delivering an impressive 270 mA of pulse current at 25°C. For comparison, a standard 3 V primary (non-rechargeable) CR2032 LiMnO2 coin cell has a lifetime capacity of 220 mAh and a peak pulse current of up to 75 mA.

Though less common, 3.6 V rechargeable coin cells are available today, but provide substantially less capacity and power than the aforementioned primary cell. Therefore, the HEC technology developed by IPS offers much higher lifetime energy and much more power than conventional coin cells