All-carbon-frameworks enabled thick electrode with exceptional high-areal-capacity for Li-Ion storage

Here, the concept of thick electrode is utilized to design a-17 mm three-dimensional (3D) all-carbon frameworks with remarkable structural stability as high-areal-capacity anode for lithium-ion batteries (LIBs). The framework involves the rational design of graphite fibers (GFs) bonded with pyrolytic carbon (PC) and graphite nanoplatelets (GNP), offering a unique architecture and a scalable production approach. The as-fabricated 3D-GF/PC/GNP electrode with a high mass loading of ≈30 mg cm −2 can deliver an unexpected high initial and reversible areal capacity of 23.53 and 11.63 mA h cm −2 at current density of 2.0 mA cm −2 , impressive rate performance and cyclic stability. Both theoretical simulations and experimental analyses show that the excellent performance of the electrode can be attributed to the incorporation of GNP that modulates the electronic conductivity of the framework, enabling easier Li-ion intercalation/deintercalation pathway to promote the pseudocapacitive and surface adsorption Li-ion storage. • Ultrathick 3D all-carbon frameworks which consist of GFs bonded with PC and GNP was designed. • The 3D carbon frameworks deliver an unexpected high-areal-capacity of 23.53 mAh cm -2 at 2.0 mA cm -2 . • The excellent performance is attributed to the GNPs, enhancing the conductivity and Li-ion storage surface adsorption.