The preparation method comprises the following steps: after a
micro electrode is prepared through 3D printing,
iodine is loaded on the surface of the
micro electrode to form an
iodine positive
electrode; preparing a
zinc negative
electrode matched with the
iodine positive
electrode in shape through
laser engraving; uniformly mixing water,
hyaluronic acid, hydrophilic
silicon dioxide,
zinc perchlorate and
zinc bromide to form a gel
electrolyte; and sequentially laminating the iodine positive electrode, the gel
electrolyte and the zinc negative electrode on the substrate, and packaging to obtain the wide-temperature-range micro zinc-iodine battery. According to the gel
electrolyte disclosed by the invention,
hyaluronic acid and hydrophilic
silicon dioxide lock water through
hydrogen bonds formed between
hyaluronic acid and hydrophilic
silicon dioxide and water molecules,
evaporation of water at a high temperature is inhibited,
perchlorate inhibits solidification of water at a low temperature by destroying
hydrogen bond structures between water molecules in a gel network, and a wide temperature range of a miniature battery is realized; meanwhile,
bromide ions in the electrolyte are transmitted to a positive electrode through an interface to excite a four-
electron reaction of iodine, so that the
energy density of the micro zinc-iodine battery is improved.