The Role of Carbon in Lead-Acid Batteries: Applications, Challenges, and Future Opportunities

The incorporation of various forms of elemental carbon into lead-acid batteries has the potential to significantly enhance battery performance. Carbon materials are commonly used as additives to the negative active material, particularly to improve cycle life and charge acceptance under high-rate partial state-of-charge (HRPSoC) conditions, which are prevalent in hybrid and electric vehicles. Carbon nanostructures and composite materials may also offer similar benefits. However, the impact of carbon on the positive active material is generally more limited compared to its influence on the negative side. Additionally, carbon can serve as a mesh current collector for both negative and positive plates. This advanced technology boosts energy storage efficiency by increasing the battery’s specific energy and optimizing active mass utilization. Such batteries, featuring a more robust active mass structure, promise extended cycle life. Recently, another important application of carbon in secondary batteries is its use in supercapacitor electrodes, which can either replace the negative plate or be connected in parallel with the lead plate. These innovative approaches enhance overall battery efficiency by improving specific power and HRPSoC performance. Furthermore, integrating carbon-based technologies into the production of lead-acid batteries can significantly enhance their performance, giving them a competitive advantage over other battery systems. These advancements also hold substantial potential for delivering more environmentally friendly and cost-effective energy storage solutions.