Flexible battery power

Mar 19, 2007

A paper-like, polymer based rechargeable battery has been made by Japanese scientists. The news is reported in the latest edition of The Royal Society of Chemistry journal Chemical Communications.

With recent advances in the technology of portable electronic devices, there is a demand for flexible batteries to power them.

Drs Hiroyuki Nishide, Hiroaki Konishi and Takeo Suga at Waseda University have designed the battery – which consists of a redox-active organic polymer film around 200 nanometres thick. Nitroxide radical groups are attached, which act as charge carriers.

The battery has a high charge/discharge capacity because of its high radical density.

Dr Nishide said: “This is just one of many advantages the ‘organic radical’ battery has over other organic based materials which are limited by the amount of doping.

“The power rate performance is strikingly high – it only takes one minute to fully charge the battery. And it has a long cycle life, often exceeding 1,000 cycles.”

The team made the thin polymer film by a solution-processable method – a soluble polymer with the radical groups attached is “spin-coated” onto a surface. After UV irradiation, the polymer then becomes crosslinked with the help of a bisazide crosslinking agent.

A drawback of some organic radical polymers is the fact they are soluble in the electrolyte solution which results in self-discharging of the battery – but the polymer must be soluble so it can be spin-coated.

However, the photocrosslinking method used by the Japanese team overcomes the problem and makes the polymer mechanically tough.

Dr Nishide said: “This has been a challenging step, since most crosslinking reactions are sensitive to the nitroxide radical.”

Professor Peter Skabara, an expert in electroactive materials at the University of Strathclyde, praised the high stability and fabrication strategy of the polymer-based battery.

He said: “The plastic battery plays a part in ensuring that organic device technologies can function in thin film and flexible form as a complete package.”

Dr Nishide envisages that the organic radical battery could be used in pocket-sized integrated circuit cards, used for memory storage and microprocessing, within three years.

He said: "In the future, these batteries may be used in applications that require high-power capability rather than high energy density, such as a battery in electronic devices and motor drive assistance in electric vehicles."

Source: Royal Society of Chemistry

Explore further: New insights on carbonic acid in water

add to favorites email to friend print save as pdf

Related Stories

Blades of grass inspire advance in organic solar cells

Sep 30, 2014

Using a bio-mimicking analog of one of nature's most efficient light-harvesting structures, blades of grass, an international research team led by Alejandro Briseno of the University of Massachusetts Amherst ...

A new approach to creating organic zeolites

Jul 24, 2014

Yushan Yan, Distinguished Professor of Engineering at the University of Delaware, is known worldwide for using nanomaterials to solve problems in energy engineering, environmental sustainability and electronics.

Power arm band for wearables harvests body heat

Apr 12, 2014

(Phys.org) —A group of Korean researchers have turned their focus on supplying a reliable, efficient power source for wearables. Professor Byung Jin Cho of the Korea Advanced Institute of Science and Technology ...

Recommended for you

World's fastest manufacture of battery electrodes

2 hours ago

New world record: Scientists at the Karlsruhe Institute of Technology (KIT) increased the manufacturing speed of electrode foils coated batch-wise by a factor of three – to 100 meters per minute. This was ...

Waste, an alternative source of energy to petroleum

2 hours ago

The group led by Martín Olazar, researcher in the UPV/EHU-University of the Basque Country's Department of Chemical Engineering, is studying the development of sustainable refineries where it is possible ...

Researchers developing new thermal interface materials

3 hours ago

In the microelectronics world, the military and private sectors alike need solutions to technologic challenges. Dr. Mustafa Akbulut, assistant professor of chemical engineering, and two students lead a project ...

New insights on carbonic acid in water

18 hours ago

Though it garners few public headlines, carbonic acid, the hydrated form of carbon dioxide, is critical to both the health of the atmosphere and the human body. However, because it exists for only a fraction ...

User comments : 0