Facile synthesis of 3D foam-like CoNiO2 for high-performance sodium ion batteries

3D foam-like CoNiO2 on Cu foil was synthesized by a low-temperature hydrothermal method with subsequent annealing treatment. In the following figure, the left is the schematic illustration of sodium ion and electron transportation of the CoNiO2 film, and the right is the rate performance comparison of the CoNiO2 film and scraped CoNiO2 powder.