Intercalation-based electrode materials for lithium-ion batteries: structure, chemistry, and performance

This study provides an overview of the advancements in intercalation-based electrode materials used for lithium-ion batteries, focusing on both anode and cathode components. The research highlights the critical role of structural design and material composition in enhancing the electrochemical performance of LIBs, particularly in terms of capacity retention, cycle life, and rate capability. Anodes typically utilize graphite due to its layered structure, allowing Li-ions to intercalate efficiently during charging. Alternative materials like silicon is being explored for their higher theoretical capacities, although they face challenges such as volume expansion and structural integrity during cycling. In cathodes, a variety of materials are evaluated for their ability to accommodate lithium ions. The traditional lithium cobalt oxide (LiCoO₂) known for its high energy density and stable layered structure, which facilitates efficient lithium intercalation. However, concerns regarding cost and thermal stability have led to the exploration of alternatives. Lithium nickel-manganese-cobalt oxide (NMC) combines the advantages of nickel, manganese, and cobalt to enhance capacity and stability. Additionally, polyanion-type (LiMPO₄) cathode materials offer excellent thermal stability, safety, and a robust olivine structure, making it an accepted option for applications requiring high power output and longevity. Key findings also include the development of composite cathodes, such as α-MoO₃/CNTs, which demonstrate improved lithium storage due to increased active sites, enhanced electrical conductivity through a 3D conductive network, and optimized ion transport pathways. The research emphasizes the importance of local chemical environments, surface modifications and structural design in optimizing intercalation efficiency and overall battery performance, drawing attention to the need for continued innovation in electrode materials to meet the growing demands for high-performance, long-lasting lithium-ion batteries in various applications.