One-dimensional perovskite-based Li-ion battery anodes with high capacity and cycling stability

Perovskite, widely used in solar cells, has also been proven to be potential candidate for effective energy storage material. Recent progress indicates the promise of perovskite for battery applications, however, the specific capacity of the resulting lithium-ion batteries must be further increased. Here, by adjusting the dimensionality of perovskite, we fabricated high-performing one-dimensional hybrid perovskite C₄H₂₀N₄PbBr₆ based lithium-ion batteries, with the first specific capacity as high as 1632.8 mAh g⁻¹ and a stable specific capacity of 598.0 mAh g⁻¹ after 50 cycles under the condition of the constant current density of 150 mA g⁻¹. The stable specific capacity is 2.36 times higher than that of the three-dimensional perovskite CH₃NH₃PbBr₃ (253.2 mAh g⁻¹), and 1.6 times higher than that of the commercialized graphite electrode (372 mAh g⁻¹). The structure difference and the associated ion diffusivity are revealed to substantially affect the specific capacity of the perovskite-based lithium-ion battery. Our study opens up new directions for the applications of hybrid perovskites in energy storage devices.