NASICON-type NaTi2(PO4)3nanoparticles with a size of ∼5 nm homogeneously embedded in mesoporous CMK-3 have been synthesized. Due to the unique structures, the electrode exhibits excellent electrochemical performances as a potential anode for NIBs.

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Nitrogen-doped, carbon-coated Li3V2(PO4)3 cathode materials were prepared by the oxidative self-polymerization of dopamine on the Li3V2(PO4)3 surface and subsequent carbonization of polydopamine.

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MXenes as a new category of 2D materials have caused a particularly large impact in numerous fields of scientific research and technical applications in recent years. Their open 2D structure and excellent electronic conductivity provide many electrochemically active sites and rapid electron-transfer paths for reversible Faradic reaction and then render them promising electrode materials for electrochemical energy storage. They offer outstanding volumetric capacitance in supercapacitors and excellent rate capability in rechargeable bat-teries. Numerous efforts have been made in the past several years. However, research on MXenes has just begun. This review aims to offer useful guidance for the synthesis of high-quality MXene materials and promote their practical energy applications in supercapacitors, lithium-ion batteries, and beyond lithium-ion batteries. A brief discussion of the challenges and opportunities for future research on MXenes is finally presented.

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The pursuit of electrochemical energy storage has led to a pressing need on materials with high capacities and energy densities; however, further progress is plagued by the restrictive capacity (372 mAh g−1) of conventional graphite materials. Tungsten trioxide (WO3)-based anodes feature high theoretical capacity (693 mAh g−1), suitable potential, and affordable cost, arousing ever-increasing attention and intense efforts. Nonetheless, developing high-performance WO3 electrodes that accommodate lithium ions remains a daunting challenge on account of sluggish kinetics characteristics and large volume strain. Herein, the well-designed hierarchical WO3 agglomerates assembled with straight and parallel aligned nanoribbons are fabricated and evaluated as an anode of lithium-ion batteries (LIBs), which exhibits an ultra-high capacity and excellent rate capability. At a current density of 1,000 mA g−1, a reversible capacity as high as 522.7 mAh g−1 can be maintained after 800 cycles, corresponding to a high capacity retention of ∼80%, demonstrating an exceptional long-durability cyclic performance. Furthermore, the mechanistic studies on the lithium storage processes of WO3 are probed, providing a foundation for further optimizations and rational designs. These results indicate that the well-designed hierarchical WO3 agglomerates display great potential for applications in the field of high-performance LIBs.