Composite Electrodes for Ultracapacitors

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Overview

Nanoramic CE electrode is a binder-free nanocarbon composite electrode which enables high performance operation of energy storage devices.

Nanoramic’s nanocomposite technology was originally developed by FastCAP systems Corporation to meet energy storage needs inthe extreme environments encountered in geothermal drilling.  Today, Nanoramic has leveraged this technology to introduce Nanoramic CE.

Nanoramic CE is an advanced electrode solution that is compatible with most widely used electrolytes, and can be used as a “drop in” replacement to existing energy storage device designs to radically improve the performance of the device.

Nanoramic CE can be used to increase one or more of the operating voltage, temperature rating, and lifetime of existing devices, pushing them to new levels of performance.

Applications

• Electric Double Layer Capacitors ( a/k/a/ supercapacitors or Ultracapacitors)
• Lithium Capacitors
• Lithium-Ion Batteries

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Example – Increased Operating Voltage

Shown here, two stainless steel pouch cell supercapacitors were constructed. One cell uses a standard activated carbon electrode, while the other uses Nanoramic CE. Both cells used off the shelf electrolyte and were identical other than choice of electrode. The cells were tested at 3.0 V at a temperature of  65 °C for over 500  hours.

As clearly shown, the Nanoramic CE enables operation at high voltage, which the incumbent cell quickly fails.  In cells optimized for high voltage use (e.g., featuring aluminum enclosures), the Nanoramic CE can provide high voltage operation for 1,000 hours or more.

Example – Increased Lifetime

Shown here, three stainless steel pouch cell supercapacitors were constructed. Two cell use a standard activated carbon electrodes, while the other uses Nanoramic CE. All three cells used off the shelf electrolyte and were identical other than choice of electrode. The cells were tested at 2.5 V at a temperature of 85 °C for over 500 hours.

As clearly shown, the Nanoramic CE extends the lifetime of the cell long past the failure of the two incumbent cells.  At 500 hours both of the incumbent cells have failed, while the Nanoramic Ce cell is going strong.

Example – Increased Temperature Rating

Shown here, a pouch cell supercapacitor using an off the shelf electrolyte was tested at 1.5 V at a temperature of 150 °C for over 1,200 hours.  No comparison is shown to an incumbent electrode, because Nanoramic was unable to find any electrode capable of surviving temperatures of 150 °C.

 

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