Abstract
AbstractFast charging is one of the key requirements for next‐generation lithium‐ion batteries, however, lithium‐ion diffusion rates of typical electrode materials are limited. Nanosizing of active electrode material is a common strategy to increase the effective lithium‐ion diffusion transport rate, but it also decreases the volumetric energy/power density and stability of the battery. In this work, nickel niobate NiNb2O6 is demonstrated for the first time as a new intrinsic high‐rate anode material for lithium‐ion batteries without the requirement of realizing nano‐architectures. The NiNb2O6 host crystal structure exhibits only a single type of channel for lithium‐ion intercalation and can be fully lithiated with a capacity of about 244 mAh g−1 at low current densities. Interestingly, a high diffusion coefficient of 10−12 cm2 s−1 at 300 K enables fast (dis)charging at high current densities resulting in high capacities of 140 and 50 mAh g−1 for 10 and 100C respectively. The minimal volume change during lithiation is the origin of the stable reversible lithiation process in NiNb2O6 and leads to 81% capacity retention after 20 000 cycles at 100C. Finally, full cell systems against LiFePO4 and Li[Ni0.8Co0.1Mn0.1]O2 (NCM811) cathodes demonstrate the promising energy storage performance of nickel niobate anodes in practical battery devices.
Highlights
Nowadays, fast charging ability of energy storage devices is essential for applications in electric vehicles and electrical power grids
A high diffusion coefficient of 10−12 cm2 s−1 at 300 K enables fastcharging at high current densities resulting in high capacities of 140 and 50 mAh g−1 for 10 and 100C respectively
Nickel niobate NiNb2O6 has been demonstrated for the first time as a new high-rate anode material for lithiumion batteries
Summary
Fast charging ability of energy storage devices is essential for applications in electric vehicles and electrical power grids. Nickel niobate NiNb2O6 is demonstrated for the first time as a new intrinsic high-rate anode material for lithium-ion batteries without the requirement of realizing nano-architectures. The achieved specific capacity at high C rates is still relatively low when taking into account the required capacities for practical high-rate storage devices Nanosizing of these niobium tungsten oxides into nanowires enhances its rate performance and cycling stability, as Nb14W3O44,[18] Nb18W16O93,[19] and Nb8W9O47[20] nanowires exhibited specific capacities of 130 (6.7 C), 153 (6.7 C), and 113 mAh g−1 (5 C), respectively. We demonstrate nickel niobate, NiNb2O6, as a new electrode material, which exhibits an intrinsic high rate performance enabled by its suitable host crystal structure, as shown, and its large pseudo-capacitance. Full cell systems against LiFePO4 and NCM811 cathodes demonstrated the promising energy storage performance of NiNb2O6 anodes in practical battery devices
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