Indian Scientists Develop Low-Cost Zinc-Air Battery Technology

Key Facts

• Zinc-air batteries use zinc as the anode and oxygen from air as the cathode reactant, enabling electricity generation through zinc oxidation and oxygen reduction.
• Researchers at SASTRA Deemed University developed a nanofluid electrolyte containing silica and zinc oxide nanoparticles, which remained stable for over three months under laboratory conditions (2024).
• The same SASTRA team also created a copper-doped manganese dioxide catalyst and converted waste carbon sources like discarded water-filter carbon and surgical face masks into carbon materials for battery use.
• Mechanically rechargeable zinc-air batteries for electric vehicles are under development at IIT Madras, led by Dr. Aravind Kumar Chandiran (2024).
• On 9 October 2024, Hindustan Zinc Limited signed a Memorandum of Understanding (MoU) with IIT Madras to develop a 1 kWh electrically rechargeable zinc-air battery prototype using water-based electrolytes and no flammable materials.
• On 26 April 2025, researchers at the Indian Institute of Science (IISc), including Professor Aninda J Bhattacharyya, developed a zinc-air battery system capable of simultaneously generating hydrogen peroxide and neutralising toxic textile dyes.
• On 28 November 2025, a team at the Centre for Nano and Soft Matter Sciences (CeNS), Bengaluru, developed an activation method for zinc-ion batteries.
• Zinc-air batteries have an estimated cost of about USD 150 per kWh, compared to USD 200–250 per kWh for lithium-ion batteries; wider adoption may reduce costs below USD 100 per kWh.
• Applications targeted include two-wheelers, three-wheelers, electric vehicles, and long-duration stationary energy storage.
• Water-based electrolytes used in these batteries are generally less flammable than organic electrolytes commonly used in lithium-ion batteries, enhancing safety.
• Hindustan Zinc Limited is India’s largest zinc producer and supports the development of zinc-air battery technologies.

Background & Context

Zinc-air batteries belong to the category of metal-air batteries, where electricity is generated through electrochemical reactions involving metal oxidation and oxygen reduction. Zinc’s abundance and high theoretical energy density make zinc-air batteries promising alternatives to lithium-ion batteries, especially for stationary energy storage and electric vehicle applications. Indian researchers, with support from DST, have advanced multiple aspects of zinc-air technology, including electrolyte formulation, catalyst development, and battery recharge methods. Incorporation of recycled waste materials demonstrates a circular economy approach in battery material sourcing. The collaboration between academia and industry seeks to develop cost-effective, safe, and scalable zinc-air battery prototypes aligned with India’s sustainable energy goals.

Why This Matters for Exams / Exam Relevance

Developments in indigenous battery technology are critical for competitive examinations focusing on science and technology, current affairs, and energy innovations. Key aspects include understanding the electrochemistry of zinc-air batteries, their advantages over lithium-ion batteries, institutional contributors such as SASTRA, IIT Madras, IISc, and DST, industry partnerships like that of Hindustan Zinc Limited, significant dates (e.g., MoU on 9 October 2024, hydrogen peroxide innovation on 26 April 2025), and application areas. The cost comparison and environmental benefits provide important context for questions related to energy security and sustainable technologies.

Points to Remember

• Zinc-air batteries generate power by oxidizing zinc and reducing oxygen from air.
• Stable nanofluid electrolytes using silica and zinc oxide nanoparticles have been developed to improve battery rechargeability and lifespan.
• Copper-doped manganese dioxide catalysts and recycled carbon materials enhance battery performance and sustainability.
• Mechanical rechargeability is being developed for electric vehicle applications.
• Collaborations between research institutes and industry players, such as the 2024 MoU between Hindustan Zinc and IIT Madras, are vital for prototype development.
• Zinc-air batteries potentially offer safer, cheaper, and more sustainable alternatives to lithium-ion batteries, with target costs below USD 100 per kWh upon scale-up.
• Innovations include multifunctional battery systems producing hydrogen peroxide and neutralising pollutants.
• Water-based electrolytes reduce flammability risks compared to organic electrolytes in lithium-ion cells.
• Applications include two-wheelers, three-wheelers, electric vehicles, and long-term energy storage.