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NEC Develops Ultra-thin Organic Radical Battery Compatible with IC Cards0.3mm thickness realized through circuit board integration
Tokyo, March 5, 2012 – NEC Corporation (NEC; TSE: 6701) announced today the development of an ultra-thin, 0.3mm thick, organic radical battery (ORB; *1) that is compatible within standard IC cards of 0.76mm thickness.
The adoption of these ultra-thin ORBs featuring greater flexibility, higher power output and faster recharging speeds than existing rechargeable batteries, including lithium-ion batteries, is expected to enable advanced new functions in IC cards, electronic paper and other technologies.
Conventional ORBs of 0.7mm thickness are difficult for IC cards of standard 0.76mm thickness to adopt.
These new, 0.3mm ORBs are less than half the thickness of existing units, a size reduction that was accomplished by using printing technologies to integrate circuit boards with batteries. As a result, IC cards embedded with these batteries can be used for a wide range of functions, including displays, transmission and advanced encryption processing.
Key features of this newly developed organic radical battery are as follows:
1) Ultra-thin 0.3mm thickness realized through integration with circuit boards
These batteries are externally wrapped with a polymer film of 0.05mm thickness that may also be used with circuit boards. Moreover, the 0.3mm thickness is achieved through printing technologies that enable negative electrodes to be directly formed on circuit boards. This is created in combination with separators (insulation) on the negative electrodes and laminated radical polymer cathodes. Conventional batteries use an aluminum laminate as external material that is 0.2mm thick.
Battery-equipped circuit boards can also be outfitted with small electronic components, such as antennae. Circuit boards that are equipped with these batteries and electronic components enable the production of standard size IC cards with built-in batteries.
2) Demonstrates both high power output and resistance to repeated charging and discharging
Battery prototypes feature a 0.3mm edge, 3cm thickness, 3mAh capacity and 5kW / L (*2) high-output power density per unit volume. Prototypes are capable of 2,000 display screen updates, 360 consecutive flash firings and 35 location transmissions on a single charge. Furthermore, charge-discharge tests indicate that the batteries maintain 75% of their initial charge-discharge capacity after 500 cycles, equivalent to the performance of lithium-ion batteries for mobile phones.
Organic Radical Battery###
Notes:
*1) Organic Radical Battery (ORB)
NEC first proposed using an organic radical compound as a battery's active electrode material in 2001. Charging occurs through the radical compound's oxidation-reduction (redox) reaction. ORB advantages include their extremely high power (large current discharge at one time). Research and development was partially carried out by the “Basic Technology Development for Fiber Materials Having Advanced Functions / Development of Battery Components to Enhance Performance and Functionality” project, sponsored by the Ministry of Economy Trade and Industry (METI), as well as the New Energy and Industrial Technology Development Organization (NEDO).
*2) kW / L is a battery’s possible electrical power output per unit volume
About NEC Corporation
NEC Corporation is a leader in the integration of IT and network technologies that benefit businesses and people around the world. By providing a combination of products and solutions that cross utilize the company’s experience and global resources, NEC’s advanced technologies meet the complex and ever-changing needs of its customers. NEC brings more than 100 years of expertise in technological innovation to empower people, businesses and society. For more information, visit NEC at http://www.nec.com.
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