As best as I can tell, LiFePo is far superior to NiMH.
I looked at several sites and here's data from one that seems to be
consistent with the others, but easier to read:
https://www.hardingenergy.com/lithium-2/
https://www.hardingenergy.com/nickel/
Continuous rate: Li is about 10x better (doesn't say if applies to
charge & discharge)
Wh/Kg: Li is about double.
Wh/L: Li is about 75%.
I put the last one in because it is the one failing point of LiFePo. On
other factors, they are fairly equivalent or not relevant as presented.
So, for cars and trucks, which is more important - the weight or the
volume ? I don't know, both are important. But I think the principal
factor is the charge and discharge rates. We're already struggling to
get fast enough charge rates to enable easy long distance driving, and
that needs to improve (by most people's opinions). NiMH would be a large
setback.
I have no idea if the patent has somehow been extended.
Peri
<< Annoyed by leaf blowers ? https://quietcleanseattle.org/ >>
------ Original Message ------
From: "EV List Lackey via EV" <ev@lists.evdl.org>
To: "Electric Vehicle Discussion List" <ev@lists.evdl.org>
Cc: "EV List Lackey" <evp...@drmm.net>
Sent: 29-Oct-22 17:37:06
Subject: Re: [EVDL] EVLN: EU agrees on 2035 ICEV ban, sort of
On 29 Oct 2022 at 20:57, Peri Hartman via EV wrote:
There's been a move back to LiFePo because it doesn't use cobalt. What
else can be done ?
Nickel metal hydride?
NiMH has significantly lower specific energy than lithium, but reliability
and cycle life are outstanding and well proven.
I don't know if we're in any better shape on the nickel supply than we are
on lithium and cobalt, or how nickel mining's environmental footprint
compares with theirs. I see that nickel mainly comes from Indonesia,
Philippines, Canada, and French New Caledonia. Those are relatively stable
places.
I think a lot of the reason that NiMH lost out to lithium for the current EV
stable was the idiotic and immoral (should be criminal) patent emcumbrance.
But that's expired, hasn't it? Yes? No?
David Roden, EVDL moderator & general lackey
To reach me, don't reply to this message; I won't get it. Use my
offlist address here : http://evdl.org/help/index.html#supt
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