SiO2-Alginate-Based Gel Polymer Electrolytes for Zinc-Ion Batteries

Aqueous Zn-ion batteries (AZIBs) are quite promising energy sources. However, aqueous electrolytes present many challenges such as hydrolysis reactions, liquid leakage, Zn dendrites, and interfacial side reactions. To solve the above problems of electrolytes, in this study, a kind SiO2-sodium alginate gel polymer electrolyte (SiO2-SA GPE) is prepared through one-pot method. The SiO2-SA GPE possessed high ionic conductivity 1.144 × 10?2 S·cm?1 perfect mechanical strength. Zn//LiFePO4 assembled with delivered discharge specific capacity 89.9 mAh g?1 (capacity retention = 74.9%) after 300 cycles at 1 C, which was much better than traditional (residual 79.2 g?1). Results rate performance long cycle life AZIBs proved that could effectively prevent zinc dendrites providing feasible strategy for improving AZIBs.