Chennai: Indian Institute of Technology Madras Researchers are developing mechanically-rechargeable zinc-air batteries as an alternative to Lithium-ion batteries which are used in Electric Vehicles.

The Researchers, who have filed for patents for this new battery technology, are collaborating with major industries to develop these zinc-air batteries. They are economical compared with existing lithium-ion batteries and have a longer shelf life.  Zinc-air batteries can be used in two-wheeler and three-wheeler EVs.

The Indian Electric Vehicle sector has been growing rapidly in recent years following the Government of India’s favourable policies and the increasing call to reduce pollution.

Lithium-ion batteries are widely used in EVs. China, which is a major manufacturer of lithium-ion batteries, dominates 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.

Dr. Aravind Kumar Chandiran, Assistant Professor, Department of Chemical Engineering, IIT Madras, and his research group have been working towards developing a cost-effective alternative to Lithium-ion batteries. They focused on Zinc-Air Batteries as Zinc is a widely-available resource.

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.’

Elaborating on this aspect, Dr. Aravind Kumar Chandiran said, “This is a major advantage of the zinc-air batteries as currently 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.

Advantages of zinc-air batteries include:

• 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

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