India Advances Green Energy Storage:Bengaluru Researchers Develop High-Density, Sustainable Cathode for Zinc Batteries

In a major advancement for sustainable energy storage, scientists from the Centre for Nano and Soft Matter Sciences (CeNS), an autonomous institute under the Department of Science and Technology (DST), have developed a novel cathode activation technique that could significantly enhance the performance of eco-friendly zinc-ion batteries.

For decades, research in energy storage has centred on lithium-ion batteries due to their high energy density. However, concerns over safety, environmental impact, and resource scarcity have driven global interest toward aqueous zinc-ion battery (ZIB) systems, known for their safety, stability, and environmental advantages. Despite this, most existing cathode materials have struggled to deliver the high capacity and long cycle life required for commercial viability.

Addressing this challenge, a team led by Dr. Ashutosh Kumar Singh has engineered a simple thermo-electrochemical method to activate vanadium oxide (V2O5), widely used as a cathode material. This treatment transforms the material’s structure, creating controlled defects that improve ion movement and energy storage capacity. The resulting zinc–vanadium oxide (Zn-V2O5) structure provides enhanced pathways for zinc and hydrogen ions, enabling superior stability and lower internal resistance during charge–discharge cycles.

According to the researchers, the activated material allows zinc-ion batteries to achieve significantly higher energy density and exceptional durability, with the potential for thousands of recharge cycles without notable degradation.

The findings, published in Advanced Energy Materials, mark a critical step forward in developing efficient, long-lasting, and environmentally friendly battery technologies.

Co-author Mr. Rahuldeb Roy noted, “Recognising the challenge in stabilising traditional cathode materials, we adopted a simplified yet innovative activation technique. This approach not only boosts performance in zinc-ion batteries but can also be extended to other cathode materials.”

The breakthrough is expected to accelerate efforts toward greener, more sustainable battery solutions for future applications.