Aqueous rechargeable zinc−iodine batteries are emerging high-safety and cost-effective technology for large-scale energy storage. However, the high solubility of discharge species polyiodide in aqueous electrolyte is the major challenge for iodine cathode. Herein, the polyiodide doped conductive polymer cathode is proposed to suppress the dissolution of active materials in electrolyte. High reversible capacity of 160 mAh/g and remarkable cycling stability with capacity retention of 79% after 700 cycles at 1.5 A/g are achieved.

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All solid-state Li metal batteries have drawn extensive attention because of the limited side reaction and consequent safety character. The applications of Li metal anodes are indispensable for realizing high energy density but still face many obstacles. One of the critical issues is the contact failure of the solid/solid interface. The rigid interface between a sulfide electrolyte and Li anode cannot afford the volume variation during cycling. Herein, we design an adhesive solid-state electrolyte film, which is supported by hot melt adhesive porous membranes for anode protection. The Li symmetric cells and all solid-state batteries based on adhesive electrolyte layers all exhibit enhanced long cyclic stability and suppressed voltage polarization. The peel strength tests confirm that the electrolyte layers decorated with adhesive components can offer intimate Li metal/electrolyte physical contact and withstand the volume variation of the Li anode. The adhesion force from porous membranes is believed to play a vital role in maintaining solid−solid interfacial contact stability. This work gives a new insight for interface engineering in all solid-state Li metal batteries.

Silicon (Si) particles were functionalized using carbon dots (CDs) to enhance the interaction between the Si particles and the binders. First, CDs rich in polar groups were synthesized using a simple hydrothermal method. Then, CDs were loaded on the Si surface by impregnation to obtain the functionalized Si particles (Si/CDs). The phases and microstructures of the Si/CDs were observed using Fourier-transform infrared reflection, X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy. Si/CDs were used as the active material of the anode for electrochemical performance experiments. The electrochemical performance of the Si/CD electrode was assessed using cyclic voltammetry, electrochemical impedance spectroscopy, and constant current charge and discharge experiment. The electrodes prepared with Si/CDs showed good mechanical structure stability and electrochemical performance. After 150 cycles at 0.2 C, the capacity retention rate of the Si/CD electrode was 64.0%, which is twice as much as that of pure Si electrode under the same test conditions.