Chennai: In a move that can revolutionize electric mobility, researchers at Indian Institute of Technology Madras (IIT-M) are developing mechanically-rechargeable zinc-air batteries as an alternative to Lithium-ion batteries which are used in Electric Vehicles.
The Researchers have filed for patents for this new battery technology and are collaborating with major industries to develop these zinc-air batteries, according to a press statement issued by the institute.
These are economical compared to existing lithium-ion batteries and have a longer shelf life, it said.
Zinc-air batteries can be used in two-wheeler and three-wheeler EVs.
Lithium-ion batteries are widely used in EVs and China is a major manufacturer of such batteries, thus dominating the EV battery manufacturing sector.
Currently, Indian EV manufacturing firms import lithium-ion batteries, mostly from China.
Although lithium-ion batteries are widely used, there are several limitations such as limited availability. Further, the diverse requirements of the Indian market cannot be fully met by lithium-ion batteries alone, it said.
Dr. Aravind Kumar Chandiran, Assistant Professor in the Department of Chemical Engineering at IIT Madras, and his research group have been working towards developing a cost-effective alternative to Lithium-ion batteries and focused on Zinc-Air Batteries as Zinc is a widely-available resource.
“Our Research Group is developing a futuristic model for zinc-air batteries for EVs. Through this research, we are also identifying shortcomings in existing technology and finding ways to address them,” Chandiran said.
The Research team has currently developed zinc-air cells and is working towards developing zinc-air packs for EVs, he added.
The Researchers are mooting separate ‘Zinc Recharge Stations’, similar to petrol stations.
The EVs Users utilising zinc-air batteries can reach out to these bunks whenever the batteries are drained, similar to the current model of conventional vehicles refuelling at petrol stations.
This technology is based on ‘Battery Swapping’ in which Vehicle Users can swap used ‘zinc cassettes’ of the battery with fully-charged ‘zinc cassettes’ at these ‘Zinc recharge stations.’
Talking about advantages of Zinc-Air batteries over Lithium-ion batteries, Chandiran said, “The only option available with the lithium-ion batteries is that the entire used battery pack has to be removed and be swapped with a complete lithium-ion battery pack. This results in double the capital investment in the case of lithium-ion batteries.”
The Researchers are also mooting to recharge the used ‘zinc cassettes’ through solar panels.
Speaking on the significance of the project, Akhil Kongara, a Research Scholar, IIT Madras, said, “According to the proposed plan, a EV user will only have to spend a few minutes at the ‘zinc recharge stations’ to swap ‘zinc cassettes’.”
Gunjan Kapadia, another Research Scholar working on the zinc-air batteries and lithium-ion batteries operational safety at IT Madras, said, “The indigenously developed zinc-air batteries, specifically in an Indian context, are extremely safe as it has aqueous electrolyte and it doesn’t catch fire even in worst case scenario of EVs accident”.
According to the press statement, advantages of zinc-air batteries are:
— Zinc is widely available in India and would reduce the import of lithium-ion batteries
— Zinc is cheaper as compared to lithium-ion batteries. While lithium-ion batteries cost $200 to $250 a KWhr, zinc-air batteries cost around $150 KWhr. With wider usage, the price is expected to come below $100 KWhr.
— Zinc-air batteries are also water-based and have a longer shelf life.
— Zinc-air batteries have good turnaround efficiency.
