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release time:2024-03-11 Hits: Popular:AG11 battery
Analysis of automotive lithium-air battery technology
The structure of the IBM air lithium battery is as shown in the figure. The anode is a lithium metal plate, the cathode is a surface carbon layer, and there are two layers of electrolytes in the middle. The electrolyte on the side close to the lithium metal plate is responsible for receiving the lithium ions released by the lithium metal plate. The electrolyte on the side close to the carbon layer is responsible for better penetrating the received lithium ions into the carbon layer. There is a barrier membrane between the two electrolytes to prevent mutual penetration and contamination between substances at different levels.
An organic electrolyte is used on the negative electrode (lithium metal) side and an aqueous electrolyte is used on the positive electrode (air) side. A solid electrolyte membrane through which only lithium ions pass is placed between the two electrolytes to separate them. This prevents the electrolytes from mixing and encourages the battery to react.
The negative electrode electrolyte combination uses an organic electrolyte containing lithium salt. Although organic solvents cannot be discarded, their use is restricted. The positive electrode uses an aqueous electrolyte using an alkaline water-soluble gel, which is combined with finely divided carbon and a subvalent oxide catalyst.
In lithium-air batteries, what is produced due to the discharge reaction is not solid Li2O, but LiOH (lithium hydroxide) that is easily dissolved in the aqueous electrolyte. After lithium oxide accumulates in the air electrode, it will not cause the work to stop. Water, nitrogen, etc. will not pass through the partition wall of the solid electrolyte, so there is no risk of reacting with the lithium metal in the negative electrode. Moreover, when charging, if a dedicated positive electrode is configured for charging, it can also prevent corrosion and aging of the air electrode caused by charging.
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