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A revolution in battery technology is brewing and it could make non-toxic, recyclable batteries the norm, reported Techradar.
Scientists in China have developed a thin, flexible battery powered by body-friendly fluids – namely, saline (or intravenous) solution and cell-culture medium – that could be perfect for wearables and implantable medical devices.
"Current batteries like the lithium-ion ones used in medical implants generally come in rigid shapes," said team lead Yonggang Wang of Fudan University in Shanghai. "Additionally, most of the reported flexible batteries are based on flammable organic or corrosive electrolytes, which suffer from safety hazards and poor biocompatibility for wearable devices, let alone implantable ones."
The use of sodium-based electrolytes that are neither corrosive nor toxic reduces the dangers associated with leaks when they do occur, while the flexibility could see these new batteries used in far more products than lithium-ion batteries, like smart clothing.
Having done away with dangerous electrolytes, the team had the freedom to build batteries that didn’t need to have excessive structural reinforcements, leading to the creation of two flexible designs – a belt-like shape, made of thin films of electrode material stuck on a steel mesh, and a woven carbon nanotube fiber backbone embedded with nanoparticle electrode materials.
During testing, both batteries came out with flying colours, outperforming most lithium-ion batteries currently used in wearables in terms of power output and amount of charge they can hold.
Not only did the concept batteries outperform traditional batteries, the nanotube fiber version accelerated the conversion of dissolved oxygen into hydroxide ions. In simple words, starved the electrolyte of oxygen.
Even though this reduces the battery’s effectiveness, deoxygenation is perfect for cancer starvation therapy.
"We can implant these fiber-shaped electrodes into the human body to consume essential oxygen, especially for areas that are difficult for injectable drugs to reach," explained Wang. "Deoxygenation might even wipe out cancerous cells or pathogenic bacteria since they are very sensitive to changes in living environment pH. Of course, this is hypothetical right now, but we hope to investigate further with biologists and medical scientists."
Meanwhile, researchers at Binghamton University in New York have created a paper-based battery that is powered by bacteria in saliva.
This new innovation, which could be pretty cheap to run, can power a single LED light for about 20 minutes with just one drop of spit.
Read more at tehchradar.com
show source http://www.techradar.com/news/bendy-batteries-that-run-on-salt-water-could-power-your-next-wearable