Nickel Niobate Anodes for High Rate Lithium‐Ion Batteries

Fast charging is one of the key requirements for next-generation lithium-ion batteries, however, diffusion rates typical electrode materials are limited. Nanosizing active material a common strategy to increase effective transport rate, but it also decreases volumetric energy/power density and stability battery. In this work, nickel niobate NiNb2O6 demonstrated first time as new intrinsic high-rate anode batteries without requirement realizing nano-architectures. The host crystal structure exhibits only single type channel intercalation can be fully lithiated with capacity about 244 mAh g−1 at low current densities. Interestingly, high coefficient 10−12 cm2 s−1 300 K enables fast (dis)charging densities resulting in capacities 140 50 10 100C respectively. minimal volume change during lithiation origin stable reversible process leads 81% retention after 20 000 cycles 100C. Finally, full cell systems against LiFePO4 Li[Ni0.8Co0.1Mn0.1]O2 (NCM811) cathodes demonstrate promising energy storage performance anodes practical battery devices.