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Asahi Kasei Begins Licensing of Lithium-ion Supercapacitor Technology 

29.7.2023
Reading Time: 3 mins read
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Asahi Kasei has begun licensing of technology for the design and manufacture of lithium-ion supercapacitors (LiCs) based on its proprietary lithium pre-doping technology.

The novel proprietary doping method enables LiCs to be manufactured at lower cost with generally available materials and equipment which are used for manufacturing lithium-ion batteries (LiBs), while enabling the design and manufacture of LiCs with increased capacity and improved input/output performance.

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The licensing includes not only Asahi Kasei’s intellectual property related to LiC technology, but also technical expertise such as cell design and manufacturing with pilot equipment. By licensing its technology, Asahi Kasei expects to support licensees around the world to significantly reduce LiC development times and achieve low-cost LiC manufacture utilizing existing equipment.

Demand for energy storage devices is forecasted to continue rising due to the spread of electric mobility and increased use of renewable energy. The LiC is a next-generation energy storage device that uses the same material as an electric double layer capacitor (EDLC) for the cathode and the same material used as an LiB for the anode. As LiCs have higher input/output characteristics than LiBs, they are suited to fields where instantaneous power is needed, and can be quickly recharged. Also featuring long cycle life and high safety, LiCs are expected to be used in mobility applications such as electric trams and buses which charge at each stop instead of using power from overhead lines.

In the growing field of energy storage systems (ESS) for renewable energy such as solar and wind, it is possible to extend the service life of LiBs by using LiCs in conjunction to reduce the LiB charge/discharge load. This is expected to reduce both running costs and environmental impact through less frequent replacement of LiBs, generating less waste.

Lithium-ion supercapacitor construction vs EDLC supercapacitor and lithium battery

The conventional LiC manufacturing process requires expensive materials for pre-doping, such as perforated foil and lithium metal foil. Furthermore, as lithium metal is highly reactive and hazardous, additional costs are incurred to maintain a safe working environment.

Asahi Kasei developed a low-cost pre-doping method using inexpensive lithium carbonate as the source of lithium ions, eliminating the need for expensive materials such as perforated foil and lithium metal foil. With this novel doping method, lithium carbonate is included in the cathode and pre-doping is performed at initial charging, when nearly all of the lithium carbonate decomposes and lithium ions transfer to the anode. This not only allows the manufacture of LiCs using materials and equipment similar to those used in the manufacture of LiBs, but also enables capacity and input/output performance to be raised by a factor of 1.3 or more (compared to Asahi Kasei’s conventional LiCs).

Novel lithium doping technology; Source: Asahi Kasei

Asahi Kasei has already licensed this technology, and will continue offering it to other licensees in order to support further adoption and application development of the LiC as a next-generation energy storage device which contributes to the world’s sustainability.

Source: Asahi Kasei

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