Mass Production of Thin, Low-ESR Electric Double-layer Energy Devices

Mass Production of Thin, Low-ESR Electric Double-layer Energy Devices


Murata Manufacturing Co., Ltd. has begun mass production of low-resistance (mΩ level) electric double-layer energy devices*1 in slim, compact packages.


To meet diverse customer needs in recent years, as battery devices must offer greater efficiency and functionality, Murata has focused R&D efforts on electronic double-layer energy devices. Technology introduced by CAP-XX, an Australian component design and manufacturing firm and Murata business partner as of 2008, has led to volume production of electronic double-layer energy devices with low resistance (mΩ level) in compact, slim packages. Optimization of electrochemical systems, including the electrode structure, enables flexible charging and discharging from high to low output at a range of temperatures. By supporting momentary peak load, the components also level battery load and can drive high-output functions that are difficult for batteries alone.



  • Low ESR (equivalent series resistance) on the mΩ level enables high-current, high-output charging and discharging
  • High peak voltage: 2.7 V per cell
  • Stable output characteristics in a broad range of operating temperatures: -30°C to +70°C
  • Slim, highly durable package

    Swelling is controlled, making the product ideal for smartphones, tablet computers, or other slim devices



  • Auxiliary power supply for LED flash units in digital cameras, camcorders, or mobile phones
  • Means of reducing battery load fluctuations by supporting peak output Means of controlling battery load fluctuations from GSM or audio output
  • Means of supporting peak output when driving small motors
  • Backup solution for SSDs*2 or similar devices
  • Means of supporting peak output for USB bus-powered*3 devices
  • In conjunction with a variety of power-generating elements, can be used as a maintenance-free power-storage element with a useful life exceeding 100,000 cycles




energy devices:

Devices utilizing a method of repeated charging and discharging that is semipermanent, in contrast to typical rechargeable batteries. Energy is stored merely by physical ion adsorption on an activated charcoal layer, without employing a chemical reaction. Rapid charging and discharging are also supported. These energy-storage devices are also attracting attention for their environmental performance, as they contain no lead or other potentially harmful substances and are thus RoHS-compliant. The underlying technology will be playing a larger role in environmentally sound lifestyles, in applications from memory backup in home appliances, mobile phones, information devices, and other electronics to power storage in hybrid vehicles or off-peak energy-storage systems.
*2SSD: Solid State Drive.

A type of storage device using flash memory. Unlike hard disk drives (HDDs), SSDs have no spinning disk, which enables higher read and write speeds.

*3USB bus-powered: A method of powering devices via USB cable, drawing electricity from computers.

Part Numbers

  • DMD2E2R1F704M2BT**
  • DMD2W4R2L354M3BT**
  • DME2D2R7F704M2BT**
  • DME2U5R5L354M3BT**





Rated VoltageNominal CapacityTypical ESR

at 1kHz

2.7V 2.1V 700mF 30mΩ 1.5mm
5.5V 4.2V 350mF 60mΩ 3.0mm

*The product line will be expanded to offer other capacities

*Operating temperature range: -30°C to +70°C

*The product line includes DMD parts for backup applications and DME parts for high peak output

Electric characteristics

A stable ESR even at low temperatures enables consistent high output across a broad range of temperatures.

ESR Temperature Characteristics DMD2E2R1F704M2BT**


Discharge at a high current is possible across a broad range of temperatures.

Discharge Characteristics DMD2E2R1F704M2BT**


Note: Data pending

External Size

External Size 2.7V


External Size 5.5V



Currently, several 10K units are produced per month.

Murata is gearing up for production of 1 million units per month by 2012.

Sample Price

2.7V: 300 yen per unit
5.5V: 500 yen per unit