Interesting. So, if the cell "loses" 30% of it's lithium, does that mean
its capacity decreases by 30%. Or, perhaps more correctly, if typical
first cycle loss is 9% and initial high current charging results in a
30% loss, then does that method result in a 21% lower capacity cell than
one with a slow initial charge ?
Is the following a correct interpretation of this effect ? If a
battery's lifespan is measured as the accumulated kWh (call it L) it
discharges till its capacity drops to 70% of its declared capacity, then
a battery that lasts 50% longer would have roughly 1.5 times the
accumulated kWh discharged, or 1.5L. However, it it looses an additional
21% at the beginning, then the net accumulated kWh would be about 80% of
1.5L or 1.2L. Is that what they mean by "extends their lifespan" ?
Peri
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------ Original Message ------
From: "EV List Lackey via EV" <ev@lists.evdl.org>
To: ev@lists.evdl.org
Cc: "EV List Lackey" <evp...@drmm.net>
Sent: 02-Sep-24 05:03:10
Subject: [EVDL] EVLN: Improving lithium cycle life
Researchers from the SLAC-Stanford Battery Center (formerly Stanford
Linear Accelerator Center) said that charging lithium-ion batteries
for the very first time at unusually high [rates] extends their
lifespan by an average of 50% and up to a maximum of 70%.
Full story:
https://insideevs.com/news/732026/lithium-battery-health-toyota-study/
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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-- Bernie Sanders
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