Beyond the Limits of Lithium Iron Phosphate: Cutting-Edge Innovations Toward High Performance and Sustainability for Next-Generation Batteries

The rapid electrification of transportation and grid systems has placed lithium-ion batteries (LIBs) at the forefront of energy storage innovation. Lithium iron phosphate (LiFePO₄, LFP), with its superior safety, long cycle life, and cost advantages, has become a cornerstone cathode material. However, the limited energy density (ED), attributed to its relatively low nominal voltage (~3.2 V) and moderate specific capacity (~170 mAh g⁻¹), hinders its competitiveness in high-energy applications. Furthermore, electrochemical characteristics related to poor charge transfer kinetics and material circularity also limit its overall value. This review highlights recent advances in material design, electrode engineering, and system-level optimization aimed at overcoming these challenges. Key strategies include precision doping, multifunctional coating, and nanostructuring to enhance conductivity and rate performance, development of high-tap-density powders and ultra-thick electrodes for improved ED, and hierarchical electrode architectures and advanced conductive networks for efficient ion/electron transport. Additional focus is given to low-temperature performance, scalable and sustainable synthesis routes, and recycling pathways that ensure long-term environmental viability. Emerging directions such as dry electrode processing, solid-state integration, and artificial intelligence/machine learning-driven optimization are also discussed as transformative tools for accelerating LFP innovation. By integrating these multidisciplinary strategies, LFP can evolve from a safe and stable cathode into a high-performance, sustainable solution for electric vehicles, grid storage, and next-generation energy systems.