On 26/05/2021 15:30, newshound wrote:
On 26/05/2021 10:14, John Rumm wrote:
On 25/05/2021 21:22, newshound wrote:
On 25/05/2021 19:56, Chris Hogg wrote:
On 25 May 2021 17:52:19 +0100 (BST), Theo
wrote:

I came across this article:
https://arstechnica.com/science/2021...der-your-nose/


It's a good roundup of all the different lithium ion chemistries
and how
things have been improving of late, and how that impacts
applications such
as phones and EVs.

Theo
" That means that the capacity of your current batteries is over 1.5
times what they would have held a decade ago."

Am I supposed to be impressed?

Not exactly Moore's Law, is it. Of course it is still worth having.
In the absence of real physics/material breakthroughs (like, for
example, a single layer atomic structure like graphene, but an
insulator) it's getting close to physical limits, although cost will
continue to come down.

Funny you should mention that, but:

https://www.forbes.com/sites/michael...an-lithium-ion




Interesting.

I forget the numbers, but doesn't a motorway petrol station effectively
deliver tens of megawatts of power when its fuel pumps are all going.


If you say a good pump can deliver 50L/min, and petrol has an energy
density of about 35MJ/L, that's 1,750 MJ/min so divide by 60 to get a
delivery rate of ~29MW.

So if you allow for the inefficiencies of the IC engine you could say
you would need an electrical delivery rate of ~10MW per pump for an
equivalent fill rate.

So, to achieve equivalent performance in terms of "refuelling" times
recharging stations are going to need fairly substantial grid
connections as we reduce the present battery charging rate restrictions.
Or else be connected to a hydrogen grid with some big fuel cells. Either
way, there are significant infrastructure questions on top of any basic
technology solution.

They could also have substantial local "batteries", to smooth out the
delivery spikes a bit.



--
Cheers,

John.

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