capacities and low lithiation potentials approaching 0 V versus Li/Li + are favored for high-energy applications. [3] Their specific capacities decrease drastically when they are charged and discharged at high rates. For example, the specific capacity of graphite drops from 350 mAh g −1 at 0.2 C to 50 mAh g −1 at 2 C. [4] In addition, their sluggish interfacial kinetics and large spatial overpotential inhomogeneities under fast-charging conditions lead to undesirable plating of the Li dendrites on the electrode surface, [5] which may result in short circuits and thermal runaway. [6] To address this issue, Li 4 Ti 5 O 12 (LTO), which exhibits superior structural stability at high rates, is currently used as an anode in high-power LIBs. [7] The LTO can maintain high stability even when charged and discharged at 50 C. [8] However, in comparison to graphite, the low theoretical capacity (175 mAh g −1 ) and high lithiation potential (1.55 V versus Li/Li + ) of LTO results in a considerably lower energy density of the battery. [9] Therefore, a significant amount of energy density must be sacrificed to achieve high power density in the LIBs. [1a] In recent years, a series of niobium-based anode materials, such as the TiNb 2 O 7 (TNO), [10] Ti 2 Nb 10 O 29 , [11] Nb 16 W 5 O 55 , [5a] and Nb 2 O 5 , [12] have been reported as alternatives to LTO. Among them, TNO is the most promising candidate because of its similar lithiation potential (1.64 V versus Li/Li + ) and considerably higher theoretical capacity (387 mAh g −1 ) than that of LTO. The layered monoclinic structure of the TNO, which consists High-power lithium-ion batteries (LIBs) are critical for power-intensive applications; however, their development is largely hindered by the lack of anode materials that have stability and high capacity at high charging/discharging rates. Herein, a cationic disordering strategy is reported to build an ideal high-power anode with boosted intercalation kinetics and a stable framework. A novel titanium niobate (TiNb 2 O 7 ) anode with unique predistorted Nb(Ti) O 6 octahedrons (pd-TNO) is developed by introducing cation disorder, which allows ultrafast Li + storage within seconds and exceptional stability over long cycling at high rates. The pd-TNO delivers an outstanding specific capacity of 153 mAh g −1 at 100 C, 20 times higher than that of conventional TNO anodes without cationic disordering, and retains 42.8% of the capacity after 15,000 cycles. Using the pd-TNO anode, a high-power LIB with an unprecedented power density of 91,197 W kg −1 at 200 C, which is approximately eight times higher than that of the advanced commercial high-power anode Li 4 Ti 5 O 12 (11,813 W kg −1 at 50 C), is demonstrated. Importantly, the pd-TNO is prepared under ambient conditions via a high-throughput process, and it exhibits considerable potential for scalability for practical applications.
