▎ 摘　　要

NOVELTY - Electrolyte solution, comprises zinc-containing electrolyte salts, water and additives; where the additive is a small organic molecule compound, a polymer compound or a specific metal salt which is completely or partially soluble in water. USE - The electrolyte solution is useful in high-temperature safe aqueous zinc-ion secondary battery (claimed). ADVANTAGE - The electrolyte solution: has high zinc metal deposition-stripping efficiency of 98.13% at high temperature of 100 ℃; and can be stable after 400 cycles. The battery composed of electrolyte solution: maintains a discharge specific capacity of 195.7 mAh g-1after 100 cycles at 100 ℃ with a rate of 2C; and realizes a stable cycle at high temperature of 100 ℃. The method: has simple process, high safety, low cost, and excellent performance; and is suitable for large-scale production. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparing electrolyte solution; high-temperature safe aqueous zinc-ion secondary battery, comprising electrolyte solution, where the high temperature is an ambient temperature of ≥ 25 ℃; and device.