Polyperylenediimide (PDI) is always subject to its modest conductivities, limited reversible active sites and inferior stability for potassium storage. To address these issues, herein, we firstly propose an organic–inorganic hybrid (PDI@Fe‐Sn@N‐Ti3C2Tx), where Fe/Sn single atoms are bound to the N‐doped MXenes (N‐Ti3C2Tx) via the unsaturated Fe/Sn–N3 bonds, and functionalized with PDI via d–π hybridization, forming a high conjugated δ skeleton. The resulted hybrid cathode endowed with enhanced electronic/ionic conductivities, lowered dissociation barriers of multiple redox centers and a stable cathode electrolyte interphase layer displays a 14‐electron involved high‐rate capacities and long cycle life. Moreover, it shows competitive performance in full cells even under different folding states and low operating temperatures.
Tin (Sn)-based alloy SnS 2 has attracted significant attention as a promising candidate for potassium ion storage due to the high theoretical capacity, however, it seriously suffers from the huge volume variation and the growth of potassium dendrites during the repeated cycling process. Herein, hierarchical polyaspartic acid (PASP) modified SnS 2 nanosheets embedded into hollow N doped carbon fibers (CN) derived from setaria glauca (PASP@SnS 2 @CN) are fabricated for potassium storage. PASP cross-linkers provide the enlarged interlamellar spacing of 6.8 Å (against 5.9 Å for the pristine SnS 2), the higher ion transportation channels as well as the selfregulating dendrite-free K plating. Consequently, a high reversible capacity (564 mAh g −1 at 50 mA g −1) and a prominent rate performance of 273 mAh g −1 at 2 A g −1 are delivered. Both the experimental data and computational models confirm that a thin and robust solid electrolyte interface (SEI) layer is formed over the dendrite free PASP@SnS 2 @CN due to the strong interactions (K-N and H + /K + proton exchange) between the PASP and the electrolyte (KFSI). The deformable and self-regulating organic-inorganic configuration is promising for the basis construction of transition metals, has practical applications for K storage.
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