A Comprehensive Analysis of Molybdenum-Based Materials for High-Efficiency Anodes in Lithium-Ion Batteries

Lithium-ion batteries (LIBs) have emerged as the leading energy storage technology for a wide range of applications, including electric vehicles, portable electronics, and large-scale energy storage systems. Among the various components of LIBs, the anode material plays a decisive role in determining the battery’s capacity, cycling stability, rate capability, and overall efficiency. Although conventional graphite-based anodes have been widely employed due to their excellent stability and low cost, their limited theoretical capacity has prompted extensive research into alternative materials capable of delivering higher energy densities. Approximately three decades ago, the lithium–sulfur (Li–S) battery system was introduced as a promising next-generation energy storage technology. However, two major challenges hindered its practical implementation: the polysulfide shuttle effect and the inherently poor electrical conductivity of sulfur. To overcome these issues, researchers incorporated conductive additives such as carbon black and conductive polymers into sulfur cathodes, forming sulfur–carbon and sulfur–conductive polymer composites. Conductive carbon additives, including Super P and high-conductivity carbon black, significantly enhanced electron transport, reduced cathode resistance, and improved active material utilization, thereby increasing battery capacity and overall electrochemical performance. Building upon these advances in conductive materials, molybdenum-based compounds have attracted considerable attention as promising alternatives to traditional graphite anodes in lithium-ion batteries. These materials possess several desirable characteristics, including high theoretical capacities, excellent electrical conductivity, superior rate performance, and enhanced structural stability. Among them, Molybdenum disulfide (MoS₂) has been extensively studied because of its layered structure, rapid lithium-ion diffusion kinetics, high specific capacity, and remarkable cycling stability. Similarly, Molybdenum dioxide (MoO₂) and Molybdenum trioxide (MoO₃) have demonstrated efficient and reversible lithium storage behavior with improved electrochemical characteristics. One of the principal advantages of molybdenum-based materials is their ability to alloy with lithium and form various intermetallic compounds, resulting in significantly higher specific capacities than conventional graphite anodes. This high theoretical capacity offers substantial potential for increasing the energy density of lithium-ion batteries, making them suitable for high-energy applications. In addition, the excellent intrinsic electrical conductivity of molybdenum-based materials facilitates rapid electron transport during charging and discharging, thereby reducing internal resistance and enhancing charge-transfer efficiency. Furthermore, their robust structural integrity helps mitigate electrode pulverization, suppress volume expansion, and maintain the stability of the electrode architecture, ultimately contributing to prolonged cycle life and superior long-term performance. Despite these notable advantages, several challenges remain. Extensive studies on molybdenum-based anodes for alkali metal-ion batteries (AMIBs) conducted from 2009 to 2023 indicate that substantial volume changes, sluggish reaction kinetics, surface instability, and irreversible capacity loss are the primary limitations. Repeated insertion and extraction of Li⁺ ions can induce severe structural degradation, causing active materials to detach from the current collector and resulting in diminished electrochemical performance. To address these shortcomings, numerous strategies have been developed. Nanostructuring approaches, such as the fabrication of porous and hollow architectures, effectively shorten ion diffusion pathways and accommodate volume changes. Carbon modification creates conductive networks that accelerate electron transport and buffer mechanical stress. Heteroatom doping introduces lattice disorder, modifies electronic structures, and enhances intrinsic conductivity. Additional techniques, including surface coating, alloying, and the formation of composite materials, have further improved the stability and electrochemical performance of molybdenum-based anodes. In conclusion, molybdenum-based materials represent highly promising high-performance anodes for lithium-ion batteries due to their exceptional capacity, superior conductivity, and robust structural stability. Significant progress has been achieved in recent years, particularly in the development of advanced AMIBs. Continued research and innovation are expected to unlock the full potential of molybdenum-based anodes and pave the way for the next generation of advanced metal-ion battery technologies.

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