Ultrastable Bioderived Organic Anode Induced by Synergistic Coupling of Binder/Carbon-Network for Advanced Potassium-Ion Storage

Abstract

Bioderived molecules have been identified as viable anodes for organic potassium-ion batteries (OPIBs) due to the abundance of the necessary natural resources, their high capacity, and their sustainability. However, the high solubility and the inherent nonconductivity cause serious capacity decay and large voltage hysteresis. Here, the biomass molecule juglone was cross-linked with a carbon nanotube network, coupling and cooperating with sodium alginate binder (J@CNT-SA), and was proposed to inhibit small molecule dissolution via weak intermolecular interactions. The synergistic effect of hydrogen bonding and π−π stacking is proven for its outstanding reversible high capacities (262 mA h g −1 at 0.05 A g −1 ), and a remarkable long life span with capacity retention of 77% over 5000 cycles. Further in situ Fourier transform infrared spectroscopy (FTIR) was performed to reveal the electrochemical mechanism. The feasibility of juglone as an anode for PIBs paves the way for other natural organic small molecules to be investigated as potential energy storage materials.

Nine‐Electron Transfer of Binder Synergistic π‐d Conjugated Coordination Polymers as High‐Performance Lithium Storage Materials

“…Meanwhile, the characteristic peak of C=O of Ni-DHBQ at 1521 cm À 1 is red-shifted after binding with CMC by FTIR detection (Figure 5a), implying the generation of hydrogen bonds between CMC and Ni-DHBQ. [24] The binding energy of CMC and Ni-DHBQ is also about three times that of PVDF (Figure 5b). Hence, no significant dissolution of Ni-DHBQ-10 %CMC was observed after five days in the electrolyte (Figure 5d).…”

Nine‐Electron Transfer of Binder Synergistic π‐d Conjugated Coordination Polymers as High‐Performance Lithium Storage Materials

“…Thus, using CMC as the binder also reduces the solubility of DHBQ (Figure S18) and enhances the capacity and the cycling stability of DHBQ‐CMC compared with DHBQ‐PVDF (Figure S15d–f). Meanwhile, the characteristic peak of C=O of Ni‐DHBQ at 1521 cm −1 is red‐shifted after binding with CMC by FTIR detection (Figure 5a), implying the generation of hydrogen bonds between CMC and Ni‐DHBQ [24] . The binding energy of CMC and Ni‐DHBQ is also about three times that of PVDF (Figure 5b).…”

Achieving Fast and Reversible Sulfur Redox by Proper Interaction of Electrolyte in Potassium Batteries

“…The cycling stability is not satisfactory because of the inevitable “shuttling effect” (Figure H). It is well-known that functional polymer binders not only maintain the integrity of the electrodes but also buffer the loss of active materials. − Surprisingly, a series of functional binders for Li–S batteries became invalid in the KPS adsorption test. As shown in Figures A and S15, only the solution containing PAA exhibited a significantly lighter color after 12 h. The affinity of polyvinyl acetate (PVA), sodium carboxymethyl cellulose (CMC-Na), and glucose for KPSs was little.…”