Interlayer expanded VS2 nanosheet for efficient sodium storage

An interlayer-expanded vanadium disulfide (VS 2 ) electrode has been developed to enhance the performance of sodium ion batteries. The interlayer expansion of the (0   0   1) plane from the standard 5.7 Å to 9.5 Å improves capacity by 2–3 times at various current densities even over long cycles. This advancement is credited to the optimized kinetics of Na + diffusion, as the intrinsic structure of VS 2 with weak van der Waals interlayer interactions leads to minimal resistance along 2D ionic diffusion routes. Our findings highlight the significance of interlayer engineering in designing efficient energy storage electrodes.