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Designing ultrathick and hierarchical electrodes is effective to deal with the challenge of high areal capacity and high power density for lithium-ion batteries (LIBs) manufacturing. Here, a thick electrode with hierarchical porous and multidimensional conductive network is fabricated by 3D printing technology, in which both the conducting polymer of poly(3,4-ethylene dioxythiophene):polystyrene sulfonate (PEDOT:PSS) and graphene oxide (GO) play the dual roles as binders and conductive agents. As a consequence, the 3D-printed thick electrode (∼900 μm) with a mass loading of ∼47 mg/cm2 exh...
Fast charging and high volumetric capacity are two of the critical demands for sodium-ion batteries (SIBs). Although nanostructured materials achieve outstanding rate performance, they suffer from low tap density and small volumetric capacity. Therefore, how to realize large volumetric capacity and high tap density simultaneously is very challenging. Here, N/F co-doped TiO2/carbon microspheres (NF-TiO2/C) are synthesized to achieve both of them. Theoretical calculations reveal that N and F co-doping increases the contents of oxygen vacancies and narrows the bandgaps of TiO2 and C, improving th...