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Electric vehicles need fuel cells


Gasoline cars have spread around the world in the last 100 years because they run on fuel that can be refilled in minutes. The electric vehicle currently under consideration has the drawback of having to be recharged. Another issue is the material of the rechargeable battery. So is there a new fuel alternative to gasoline? Hydrogen fuel has fuel storage and transportation issues and is even more problematic than rechargeable batteries. Professor Emeritus of Tokyo Institute of Technology Yabe claims that magnesium plays that role. Moreover, if you get it from seawater, it will be cheaper than gasoline.

   Charging problem

An electric vehicle can run 600km with a 100kWh battery. However, in order to charge this battery in 1 minute, which is the same as the gasoline refueling time, 6 MW of electricity is required. Even if the peak of electricity used in one house is 10 kW, it is equivalent to 600 houses. With all charging stations using 6 MW each, the time variation of this power is tremendous . Some people say that if the battery is improved, it can be charged within 1 minute, but the problem of charging is not related to the performance of the battery and is a problem of power supply. A very large amount of power is required for a short charge . It is strange that no one says how to solve the momentary fluctuation of high power at charging stations here and there, let alone building the power infrastructure .


   Battery replacement is not possible

There is also the idea of replacing the battery . Since it takes a long time to charge, the idea is to keep a number of charged batteries and replace them. It sounds good, but if you imagine the situation in Japan, you can see that this is completely impossible. Looking at one gas station, there are times when dozens of cars are concentrated in an hour. Depending on the time, it may not come at all. But spare batteries need to accommodate this concentrated time zone. Even after that time, I don't know when the next wave will come, so I have to charge dozens of cars within an hour. This is the same as charging in a few minutes, so it still requires a huge amount of power.


No battery material


Is it in seawater?


Some people say it's okay because seawater is rich in lithium.

However, there are only 250 billion tons of lithium in the oceans of the world. In contrast, magnesium is 1800 trillion tons.

​ To get 1 billion tons of lithium, we need 1/250 of the world's seawater. This is equivalent to seawater at a depth of 30m in the Pacific Ocean.


Disc-type magnesium fuel cell controls EV


Professor Emeritus of Tokyo Institute of Technology Yabe proposed a completely new fuel cell and obtained a patent. A disk-shaped battery like the one on the lower right is inserted into the battery part (black part) while rotating. After the reaction, it will leave the battery section. This will result in 10-20 battery reactions. The important thing is that you can stop the battery in the middle and just insert the fuel when you restart.

In the height direction, multiple batteries are connected in series. For example, a battery with a diameter of 60 cm and a height of 50 cm will produce a battery with a diameter of 36 kWh and a weight of 26 kg. With a lithium-ion battery, a battery with this capacity weighs about 200 kg, making it possible to create a lightweight, high-output battery.


Charging while driving with in-vehicle magnesium battery

Yabe Magnesium batteries have an energy of 1.5kWh / kg. It means that 67kg of magnesium is required for 100kWh. If you charge the battery at 20kW for 5 hours while driving, the size of the battery will be 56cm x 72cm x 80cm, which is the size that fits in the trunk.

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