hias9 said:
It's a bit off-topic, but what I am curious to see would be a diagram how quick-charging affects cycle-life.
Something like the following:
The first graph using normal charging current (for GA: 0.3C), the second using quick charging current (for GA: 0.5C) and the third using an unhealthy quick charging current (for GA: 1C)
Good Question!
At the heart of the topic, not off topic at all.
john61ct said:
At 25°C just accept the maker's datasheet.
Go warm enough, even 1C is no problem at all, maybe even higher.
Go colder and even the lower rates are not optimal for longevity.
But the actual total impact from just this factor is not so great if discharging is already at high rates, avg DoD is high, storing in warm temps and high SoC, etc.
It is just not practical to put hard numbers on so many infinitely variable factors.
If **every** other factor is optimized, maybe a 10% cycle life factor between each of those three C-rates?
Most owners just don't fuss that much.
Good Answer
I agree that it is more useful to have a "Rule of Thumb" on this (and a layman's understanding) than an Absolute set of numbers or limits. If folks understand the principle of the topic then they can extrapolate their own conclusions.
...
Lithium tolerates being fast charged at Ambient temperature
Lithium does not like being fast charged while cold
Ok -
From that I picture a gooey slurry . . . where some parts are clumpy and other parts are fluid... where when warm it is all more homologous... and if we try to slam current into something clumpy then the current flows in-equally thru the goop leaving some areas more affected than others.
If that were true
Then it would be "hotter is better"
And this may be true, but limited, by some other bounding factors.
....
To flippy's point -
This forum spans everything from the completely incompetent to the epic expert. Part of what we are doing here is bridging that knowledge gap. This is no doubt a place where you can
... I know Jack about the super intricate details of Lithium Chemistry, but, in trying to cook it down into something a layman can understand ... in making small mistakes... Experts show up, correct (with the details which are hard to comprehend)... then I re-compile and try to cook down again.
That is the age old formula for bridging the gap. Works well. Stoked that everyone is here.
-methods