Optimizing NAM Structure with Additive Formulation for Enhanced Performance in Lead-Acid Batteries for Auxiliary Applications

With the rapid adoption of start-stop systems and hybrid/electric vehicles (HEVs/EVs), there is an escalating demand for 12V auxiliary energy storage systems that can operate reliably under dynamic conditions.
In the energy storage space, lead-acid batteries (LABs) remain a cost-effective and scalable solution, provided their performance is optimized in three key areas: Pulse Power Characterisation (PP), Charge Acceptance (CA), and Charge Recovery (CR). These parameters are critical to supporting high-current, short-duration loads from systems like Electric Power Steering (EPS) and Heating, Ventilation, and Air Conditioning (HVAC), while maintaining voltage stability for sensitive electronic control units (ECUs) under dynamic driving conditions.
In this context, we present our advances focusing on engineering the negative active mass (NAM) with conductive additives and pore-forming agents to improve internal conductivity, reduce resistance and voltage drop. These modifications enhance charge transfer kinetics, lower sulfation rates, and improve electrochemical reversibility.
Furthermore, structural innovations such as continuous rolled thin grid technology to improve current distribution, reduce corrosion, enhance mechanical durability and active surface area. These improvements, combined with next-generation material additives, contribute to significantly improved battery performance.
These developments not only extend the cycle life and dynamic responsiveness of LABs but also reinforce their viability as a competitive and environmentally sustainable solution for modern automotive applications.

Presenters

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Dr Sreedhar Naidu Doraswamy

Dy. Manager (R&D – Materials), Amara Raja Energy & Mobility Limited

India

Sreedhar Naidu Doraswamy, Deputy Manager at AmaraRaja Energy & Mobility Limited, India, where he is involved in material testing and research in the Department of Materials. His expertise is in advanced material characterization tools, leveraging them to drive innovation in energy storage technologies. He has played a pivotal role in the development of Enhanced Flooded (EFB) and Advanced Absorbed Glass Mat (AGM) battery strategies to meet growing automotive and industrial demands. Dr. Sreedhar holds a Ph.D. from the University of South Africa, Johannesburg and a Master’s from SRM University, India. He has authored several peer-reviewed publications and holds a couple of patents in energy materials and battery technologies.