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

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

Technology News |
By eeNews Europe

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 available today.

All-solid-state HEC technology delivers about 70-percent (700 Wh/l) of the rated capacity at a current density of 1 mA/cm2, which is comparable to the continuous current density of a conventional lithium ion (Li-ion) prismatic battery with energy densities of only 400-500 Wh/l. Employing the HEC technology into a tiny, fully encapsulated, 4.8 mm round cell with only 1.0mm thickness delivers ~3 mAh of capacity at a continuous current of ~35 µA and can provide a pulse current of ~3 mA at 25°C. This is a strong capacity-current capability for many real-time clock (RTC) and memory backup power applications, and offers five times more energy density and 5 times more power than existing ML414 cells using Li/MnO2 chemistry.

Dr. Bernd Neudecker, Chief Technology Officer at IPS and inventor of the HEC technology, is continuing optimization of the HEC technology at the company’s R&D and battery manufacturing facility in Littleton, Colorado, USA. Standard products that use the new technology are expected to be available by 2014. .

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