electric transport: cars, bicycles, public transport, planes ...Graphene batteries developed, but 60 wh / kg, charge in 15s

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Graphene batteries developed, but 60 wh / kg, charge in 15s

Unread Messageby jean.caissepas » 10/09/20, 13:53

To read here, a small step in the right direction ...

https://www.clubic.com/mag/transports/a ... hene-.html
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Re: Graphene batteries developed, but 60 kwh / kg, charge in 15s

Unread Messageby Paul72 » 11/09/20, 14:25

If this track is cheaper and more ecological than Li ion, it can be interesting in domestic (and more) to manage the massive arrival of intermittent renewables on the network.
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Re: Graphene batteries developed, but 60 wh / kg, charge in 15s

Unread Messageby Christophe » 11/09/20, 15:50

There was an extra k in the title ... it was too good !! I corrected !
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Re: Graphene batteries developed, but 60 wh / kg, charge in 15s

Unread Messageby ENERC » 11/09/20, 19:47

jean.caissepas wrote:To read here, a small step in the right direction ...

https://www.clubic.com/mag/transports/a ... hene-.html

Hum ...
I charge my 60 kWh in 15 seconds .... what does it give as power?
60*1000*3600/15 = 14400000
Yes there are a lot of zeros. that's 14,4 MW !!!! for a car.

this is for 20 MW:
Image

I can't even imagine the 800 V cable that will receive 18 amps .... Plus the electronics behind.

The correct load calculation is as follows:
- I drive at 130 km / h for 2 hours
- I consume 40 kWh
- I stop to charge 15 minutes (so every 2 hours at 130)
- I need 160 kW of charging power

160 kW per car, not 14 kW.

The only advantage of charging quickly is for the F1 / FE. 15 seconds at the pit and off we go.
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Re: Graphene batteries developed, but 60 wh / kg, charge in 15s

Unread Messageby izentrop » 11/09/20, 20:51

Christophe corrected : Wink:
ENERC wrote:The correct load calculation is as follows:
- I drive at 130 km / h for 2 hours
- I consume 40 kWh
- I stop to charge 15 minutes (so every 2 hours at 130)
- I need 160 kW of charging power
It makes 700 A at 230 V : Shock:

How do you recharge? the most powerful terminals charge at 22 Kw? https://prix-elec.com/conseils/compteur ... electrique

PS: yes the F1 / Fe charge in direct current probably ..
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Re: Graphene batteries developed, but 60 wh / kg, charge in 15s

Unread Messageby sicetaitsimple » 11/09/20, 21:17

ENERC wrote:I charge my 60 kWh in 15 seconds .... what does it give as power?
60*1000*3600/15 = 14400000
Yes there are a lot of zeros. that's 14,4 MW !!!! for a car.


Well, there was some error in the numbers, between Wh and kWh. Let's move on.

But indeed even if for a few years the charging powers of the fast stations for EVs have continuously increased, that will inevitably have a limit one day, or rather it will emerge outside the purely technical limits an "optimum" between "recharging times" and "number of terminals" (cost of the structure and its operating costs).

"Ultrafast" recharging, this is the promise of graphene batteries, could nevertheless be interesting in a certain number of applications (city buses for example). Wait and see.
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Re: Graphene batteries developed, but 60 wh / kg, charge in 15s

Unread Messageby Obamot » 11/09/20, 23:01

sicetaitsimple wrote:
ENERC wrote:I charge my 60 kWh in 15 seconds .... what does it give as power?
60*1000*3600/15 = 14400000
Yes there are a lot of zeros. that's 14,4 MW !!!! for a car.


Well, there was some error in the numbers, between Wh and kWh. Let's move on.

But indeed even if for a few years the charging powers of the fast stations for EVs have continuously increased, that will inevitably have a limit one day, or rather it will emerge outside the purely technical limits an "optimum" between "recharging times" and "number of terminals" (cost of the structure and its operating costs).

"Ultra-fast" recharging, this is the promise of graphene batteries, could nevertheless be of interest in a number of applications (city buses for example). Wait and see.

LINK PLEASE !!! ???

Ah ... here we are witnessing the most gigantic split of Simple ...

Can he give us the dielectric permittivity in the case of graphene (on a thick atom it must be “huge” that ...) : Mrgreen:

You take the substrate you want eh, if necessary, take your time ... : Cheesy:

For me, the dielectric constant between two consecutive layers of graphene, that must not be foolish! Because of that, we will never end up with graphene!
Without being too mistaken, at a pinch for super capacities in a smartphone. And it will stop there ...

For a car, do not even think ... A bus even less!

If you think of supercapa, and without being too mistaken, you have to forget the graphene here eh, they are not used for the same field of application, speaking of buses / trams, their function is to provide current peaks, but not in the long term.
Eg. when the tram arrives at the station, the supercapa are recharged almost instantly, then, between 2 stations, they charge the Li-ion batteries by filling the energy spent between the 2 previous stations ...

The fields of application of graphene are determined according to its physical properties (dielectric, material thickness, etc.)
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Re: Graphene batteries developed, but 60 wh / kg, charge in 15s

Unread Messageby phil59 » 12/09/20, 14:44

izentrop wrote:It makes 700 A at 230 V : Shock:

How do you recharge? the most powerful terminals charge at 22 Kw? https://prix-elec.com/conseils/compteur ... electrique

PS: yes the F1 / Fe charge in direct current probably ..
^

For a long time, in EV, we have loads up to 50 kW. The 22 kW are the basis of Zoe.

We now arrive at roughly 100 kW for standard cars, and in recent years 120 kW for Tesla.

The future terminals are planned to deliver 350 kW.

For every day, a simple 220V and 8A socket, or about 2 kW, are quite sufficient.

Depending on the route, 22 kW terminals are good, with 50-100 kW, we manage to master a trip up to 1000 km.

The terminals charge more towards 400V, and we now arrive at 800V.
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Re: Graphene batteries developed, but 60 wh / kg, charge in 15s

Unread Messageby sicetaitsimple » 12/09/20, 15:12

Thank you for this inventory, which corresponds roughly to what I had in mind (even if I don't have an EV, I'm very interested in it).

Coming back to the thread and to the article cited in the first post, we can therefore clearly see that there is an optimum to be found between, on the one hand, the capacity of the charging terminals to deliver high charging powers and of on the other hand, the vehicles' capacity to accept them (without the charging power falling too quickly as the charge progresses).
Maybe hybrid Li-Ion / Graphene storage systems can help. Wait and see.
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Re: Graphene batteries developed, but 60 wh / kg, charge in 15s

Unread Messageby Obamot » 12/09/20, 17:33

Tsssss ... Ah, the speech changes!

But where have the graphene batteries gone to power urban and orbital buses? : Cheesy: “Teacher”?

Where is the link of the “promise of graphene batteries”Pfouit, flew? ! : Cheesy: : Cheesy: :D
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