Biomass-derived porous carbon materials with superior wettability towards electrolyte are promising as electrodes for commercial supercapacitors (SCs), but the traditional synthetic processes result in serious environmental pollution and energy consumption....
Metal chloride‐intercalated graphite with multiple/versatile functions is one of the promising categories for charge storage, especially in achieving high volumetric and gravimetric performance simultaneously. Herein, a novel field‐induced energy accumulation strategy is proposed and demonstrated to achieve minute‐level fast preparation of stage‐1 dominated FeCl3‐graphite intercalation compounds (GICs). The microwave‐induced Joule heat and electron excitation from the graphite conjugated system produce the arc plasmas with high energy density in the limited microenvironment, accompanied by the enhanced internal energy of gaseous reactant molecules and the strengthened intercalation reaction kinetics. When evaluating the anode for lithium storage, the FeCl3‐graphite intercalation compounds feature the promoted self‐activation characteristics and deliver a high volumetric capacity up to 1650 mAh cm−3. In particular, with the assistance of the operando Raman technique, it is interesting to find that the electronic decoupling effect among graphite and FeCl3 layers is responsible for the self‐activation process. Thus, it is reasonable to believe that this work can further offer an insightful and referable idea into the in‐depth investigation of metal chloride intercalated graphite, especially for applications in lithium storage.
Nanoplate‐shaped Ni(OH)2 with numerous exposed active sites hold much promise for high‐performance energy storage devices. However, restricted by the wide band gap, which leads to a low concentration of charge carrier, the energy barrier of electron mobility in lattice plane is high, further inhibiting the electron transfer and their practical application. Here, several unique processable nickel‐based hydroxide films are constructed via the cation‐inserted strategy to probe the intrinsic relationship between component and electronic micro‐structure. Benefiting from the component‐driven effects, the concentration of charge carrier at the lattice plane can be accumulated after injecting heterogeneous cations, and the fastened dynamics process can be realized and confirmed by multiple real‐time operando techniques. Meanwhile, the more well‐matched Co core rather than Mn core in Ni(OH)2 is also certified. Finally, the CoNi(OH)2 electrode achieves 623 C g–1 @1 A g–1 without any conductivity additives and binders, which is nearly threefold that of pristine Ni(OH)2. This work clarifies the critical role of inserted cations, and corresponding electron and electrolyte ion transfer across the matrix, thus enabling a better guideline for Ni(OH)2‐based energy storage/conversion systems.
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