In principle, zinc-air batteries will lose energy during storage. Although some batteries have a longer storage time than others. The inherent electrochemical system of the battery gradually loses the energy of the battery. This process is called self-discharge phenomenon, which is related to the material properties of the anode in the electrolyte and its thermodynamic instability. The rate of self-discharge phenomenon in rechargeable batteries is higher than that in non-rechargeable batteries.
The self-discharge of rechargeable batteries at room temperature is generally (15% ~ 25%)/month, and the monthly self-discharge rate of solar cells is relatively low, about 10%. This phenomenon is extremely low in non-rechargeable batteries, below 2% per year at room temperature, but this value will be influenced by many factors.
Among all the environmental factors, temperature is the biggest one. This is related to the temperature-dependent electrochemical reaction at the electrode/electrolyte interface, which can be considered as the heart of the battery. When the temperature drops, the reaction rate of the electrode also drops and the current decreases. When in use, it takes a lot of energy to gradually return to room temperature. When the temperature rises, the reaction rate of the electrode also rises, the current increases, and energy is consumed. The general temperature of refrigerator is 0 ~ 10℃, which is a good place to put batteries.
The second influencing factor is humidity. Zinc-air battery is characterized by being directly connected with the surrounding atmosphere. If the relative humidity is too low, the electrolyte in the battery will slowly dry out. If the relative humidity is too high, the system will store water, both of which are contrary to the performance of zinc-air battery. If the battery is stored in the refrigerator, don’t forget that the refrigerator also provides a low-humidity environment, which is just like the uncovered food in the refrigerator, the food will gradually lose water and dry out. So it’s best to put the battery in an evaporation-resistant package first.