+
Transportation

Aluminum-air battery, Citroën tests it


The electric cars next generation will be equipped by batteries more efficient, there is one in the technological field tide of ad hoc innovations, you just need to understand which way to go. If for the Japanese Toyota and the German BMW the answer is given by Lithium-Air batteries, there are those who point to Sodium-Air batteries and those who still talk about the Aluminum-Air combination, in this case the car company is French, these are the Citroen… The hypotheses are many and development tests are underway!

Let's make a point of the situation:

  • Toyota and BMW have entered into an agreement for the design and development of one battery ultra-efficient based on Lithium-Air. There battery it should be developed and presented by next 2014, so the time is imminent. There Lithium-Air battery it has a theoretical maximum density of 3450Wh / kg and will be very expensive. To be clear, current lithium-ion batteries have a density of only 200 Wh / kg. Thanks to the Japanese-German partnership (Toyota + BMW) times are imminent but the devices should be quite expensive.
  • The Sodium-Air batteries they would be much more accessible. The energy density is 1600Wh / kg but the biggest flaw concerns the lifespan. These batteries should be replaced in a very short time because they support few charging cycles. No car manufacturer seems to have considered this technology.
  • There Citroen is testing Aluminum-Air batteries, capable of covering 1,600 kilometers with just one "full".

The search for Citroen rather particular. Battery aluminum-air it would not replace the current ones lithium ion batteries but it would play a supportive, indeed, emergency role. Let's make a hypothesis. The driver normally recharges the lithium ion battery which ensures an autonomy of 150 kilometers, if the driver does not find an electric charging station or makes a change of route, the aluminum-air coil which allows you to travel the extra kilometers. In other words, the aluminum-air battery it works as a sort of emergency backup. Every 200 kilometers traveled with the aluminum-air coil, the pilot must remember to add distilled water to ensure proper functioning.

The aluminum-air coils they have a density 100 times higher than that of current lithium-ion batteries but, again, the problem lies in the lifespan. The batteries tested by Citroen they run out soon and therefore cannot be refilled. The "pack " tested by Citroen, it weighs only 55 kilograms, is made up of 50 plates each of which allows you to travel 20 miles, for a total of 1,600 kilometers. There Citroen could market aelectric car which leads, "preloaded ", an emergency range of 1,600 kilometers, the battery could then be removed and replaced. A great step for the electric mobility, motorists could forget the nightmare of the limited range to travel. We must "only" consider i environmental costs linked to the initial extraction ofaluminum and its potential for reuse.



Video: High Voltage Aluminium Air Battery (January 2021).