MIT created a battery from a genetically engineered virus to pick up carbon nanotubes to create and grow the components required to make a battery.
Engineers at MIT discovered genetically altering a viruses enables it to collect the materials required to make the positive and negative ends of a lithium-ion battery. The new batteries’ characteristics almost exact the performance of state of the art rechargeable batteries currently being used in hybrid cars and personal electronic devices.
Traditionally, lithium-ion battery utilizes lithium ions which flow between a negatively charged graphite anode and a positively charged cathode generally comprised of cobalt oxide or lithium iron phosphate. However, a team at MIT discovered a method to genetically alter viruses
Self-assembling mechanism of modified M13 virus [Image Source: Jean-Marie Tarascon/Nature Nanotechnology]
According to MIT the battery is achieved by
“genetically engineered viruses that first coat themselves with iron phosphate, then grab hold of carbon nanotubes to create a network of highly conductive material. Because the viruses recognize and bind specifically to certain materials (carbon nanotubes in this case), each iron phosphate nanowire can be electrically “wired” to conducting carbon nanotube networks. Electrons can travel along the carbon nanotube networks, percolating throughout the electrodes to the iron phosphate and transferring energy in a very short time.”
The bacteria selected is a bacteriophage, meaning it can only infect bacteria while remaining harmless to humans.
After the initial experiments of creating a viable but poorly performing battery, the team decided to introduce the carbon nano tubes in an effort to increase the cathode’s conductivity without much addition of external weight. With the new modification, the viruses were able to self-assemble a nanowire after becoming an anode by collecting cobalt oxide and gold on themselves, further improving the performance of the originally virus-oriented battery. The new batteries created demonstrated some extraordinary characteristics as the batteries maintained a high energy density (~200 W h kg−1) and high specific power (~4.5 kW kg−1). Pending on improving the charging cycle degradation, it could be a viable candidate to be used within electric cars and other electronic devices. However, while the batteries were able to achieve 100 charging cycles without losing much capacity, after the initial 100 cycles, the performance begins to degrade far quicker than current lithium-ion batteries.
Unfazed from the minor setback, the team decided to push forward with further experimentation. After the initial success of demonstrating the feasibility of creating a battery from a virus, perhaps a few more modifications could see the battery become more reliable and resilient to degradation making it an economically and environmentally friendly alternative to other methods of battery production. The new batteries could become the future power stores for electric cars and electronic devices.