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Comparison of aluminum-based and magnesium-based Leclanche battery and traditional leclanche battery

Return Listsource:Gratene date: 2022-06-17

Comparison of aluminum-based and magnesium-based Leclanche battery and traditional leclanche batteryBattery aluminum and magnesium replacement zinc do an anode is also very attractive, it can greatly increase the specific capacity (aluminum anode 2.2A ¡¤ h / g, magnesium anode 2.2a ¡¤ h / g, and zinc anode 0.82ah / g) . In addition, the standard potential of magnesium and aluminum is higher than zinc, so they have higher voltage and energy density. There are two problems delayed the actual development and commercialization of several magnesium-based batteries: First, the corrosion rate is greatly increased; the second is that the anode-generated oxide film inhibits corrosion, but also causing discharge “voltage delay”.

The effect of oxide film on magnesium and aluminum has become the subject of many research work. The mixture of chromates and a red chromate is formed with a diamond-dissolving oxide film under the common action of other substances in the electrolyte, which can effectively prevent further corrosion. Therefore, it is not possible to store a sealing battery with aluminum or magnesium anode or even in high temperatures. However, once the battery starts working, there is current flow, the oxide film is destroyed, and the metal is rapidly corroded until it is finally reformed of a layer of oxide film. More importantly, the oxide film causes the initial power consumption point and the battery to reach the working voltage point.

Aluminum-based batteries typically do electrolytes with alumina (AMC1,) or chromium chloride (CRCI,) solution. The optimum electrolyte of the magnesium-based battery is magnesium bromide (MGBR2) or oxygen-based (Mg (C1O4) 2), and the cushion adjustment pH is adjacent to 8.5 by magnesium hydroxide (Mg (OH),) The chromate buffer solution is usually added, and the selection of the buffer solution will affect the degree of voltage hysteresis. In addition, the appropriate alloy can also prevent corrosion and reduce voltage hysteresis. For example, magnesium anodes can be added 1% zinc to reduce lag, plus 2% aluminum can adjust corrosion current.

The typical feature of aluminum or magnesium anode battery is that the operating voltage is higher than the zinc anode battery, and the open circuit voltage of the magnesium-based Leclanch6 battery is about 1.9Y. However, the capacity of the magnesium or aluminum anode battery varies greatly, depending on the corrosion speed, it is a function of the discharge state.
Many cylindrical and flat magnesium-based batteries have been commercialized, mainly for demarcies and heavy weights of military fields. Currently, in this application field, most of them use various lithium batteries without using a magnesium battery. Aluminum-based Leclanche batteries are not commercially, in addition, some metal-air batteries are also magnesium, aluminum is made of anod 

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