M-Nb^V-O compounds have attracted a lot of attention from the research community due to their merits in improving active material performance in lithium-ion batteries by enabling fast-charging due to the phenomenon of intercalation pseudocapacitance, where there are no solid-state diffusion limitations. TiNb₂O₇ and Ti₂Nb₁₀O₂₉, both known as TNO, are an evolution of Li₄Ti₅O₁₂ (LTO), a material known for its fast-charging capabilities and safety due to its operation above 1.0 V vs. Li/Li⁺. The higher operating potential prevents possible lithium deposition, resulting in the ability to fast charge without safety concerns. TNO overcomes LTO’s low energy density deficiency with a high theoretical capacity slightly larger than graphite’s (372 mAh/g), while retaining fast charge and safety benefits. Nb₂O₅, Nb₁₆W₅O₅₅ and Nb₁₈W₁₆O₉₃ are similar to TNO in that they exhibit high energy density and high rate capability but have the additional benefit of not requiring nanoscaling or nanostructuring for optimal performance.