The chemical reaction of aluminum air battery is similar to that of zinc air battery. The aluminum air battery uses high purity aluminum Al (containing 99.99% aluminum) as the positive electrode, oxygen as the negative electrode, and potassium hydroxide (KOH) and sodium hydroxide (NaOH) aqueous solution as electrolyte. . Aluminum takes up oxygen in the air and produces a chemical reaction when the battery is discharged. Aluminum and oxygen react to convert to aluminum oxide. The development of aluminum air battery is very rapid, and its application on EV has achieved good results. It is a promising air battery.
Features of aluminum air battery:
1, greater than the energy
The theoretical specific energy of aluminum air battery can reach 8100Wh/kg. The actual specific energy of current aluminum air battery only reaches 350Wh/kg, but it is also 7-8 times of lead-acid battery, 5.8 times of nickel-hydrogen battery, and 2.3 of lithium battery. Times. After adopting the aluminum air battery, the vehicle can significantly improve the driving range. According to foreign information, the electric motor vehicle using aluminum air battery in California has a record of replacing the aluminum electrode with a driving range of 1600km.
2, light weight
The traction energy-type lead-acid battery developed and developed in China has a total energy of 13.5 kWh and a total mass of 375 kg. The total energy of the same energy aluminum air battery is only 45kg, which is 12% of the quality of lead-acid batteries. As the quality of the battery is greatly reduced, the quality of the vehicle is also reduced, which can increase the load energy of the vehicle or extend the driving range.
3, aluminum is not toxic and dangerous
Aluminum does not cause harm to the human body and can be recycled and recycled without polluting the environment. Aluminum is rich in raw materials and has a large-scale aluminum smelter with low production costs. The recycling and recycling of aluminum is convenient, and the recycling cost is also low. Moreover, the method of replacing the aluminum electrode can be used to solve the problem of slow charging of the aluminum air battery.
Although the aluminum air battery contains high specific energy, the specific power is low, the charging and discharging speed is relatively slow, the voltage is delayed, and the self-discharge rate is large. A thermal management system is needed to prevent overheating of the aluminum air battery during operation.
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