Low-temperature anti-freezing double-network hydrogel electrolyte as well as preparation method and application thereof

The invention discloses a low-temperature anti-freezing double-network hydrogel electrolyte as well as a preparation method and application thereof. The method comprises the following steps: mixing a ZnSO4 aqueous solution, a 2-acrylamido-2-sodium methylpropanesulfonate solution and xanthan gum to obtain a first mixed solution; adding an initiator and a cross-linking agent into the first mixed solution to obtain a second mixed solution; discharging oxygen in the second mixed solution, and carrying out polymerization reaction at a preset temperature for a preset time to obtain the low-temperature anti-freezing double-network hydrogel electrolyte. According to the electrolyte, a negative charge sulfonic acid group on a polymer chain guides Zn < 2 + > to be uniformly deposited on a zinc negative electrode through coordination, so that growth of zinc dendrites can be inhibited to a certain extent; anions and cations dissociated from the ZnSO4 aqueous solution are combined with part of water molecules to form hydr