This is from 2006 and yes they may have improved the electrolyte but it's best
to foillow your battery manufacturers guidelines on this.
The effect of temperature on the cell voltage and
electrode potentials during charging at 5mA is similar to
charging at high currents, lithium plating was observed in all the cases and it
was aggravated by
decreasing the temperature. In particular, the CC step vanishes as
the temperature
drops to −20 ◦C, where lithium plating occurs
as soon as the charging starts and accompanies the whole charging
period.
This observation may be associated with these two factors: (1) graphite suffers
from a
high over-potential due to the decrease in ionic
conductivity of electrolyte and the slowdown in kinetics of Li+ ion
intercalation into graphite and (2) the plated lithium cannot fully
re-intercalate
into
graphite before the end of charging.
As the temperature is at 0 ◦C or above 0◦C, the charging time is dominated by
the CC time, and the charging capacities achieve more than 31 mAh (97% versus
the full capacity of 32 mAh). As the temperature drops to−10 ◦C, the total
charging time remains almost unchanged, whereas the portion of the CV time is
significantly increased. With respect to the increase of CV time, lithium
plating is aggravated and the charging capacity
accordingly is decreased from the full capacity (32 mAh) to 26 mAh. These
results suggest that Li-ion batteries should not be charged below 0 ◦C.
Study of the charging process of a LiCoO2-based Li-ion battery
S.S. Zhang ∗, K. Xu, T.R. Jow
U.S. Army Research Laboratory, AMSRD-ARL-SE-DC, Adelphi, MD 20783-1197, USA
Received 30 January 2006; received in revised form 14 February 2006; accepted
15 February 2006
Available online 18 April 2006
________________________________
From: Christopher Darilek via EV <ev@lists.evdl.org>
To: Electric Vehicle Discussion List <ev@lists.evdl.org>
Sent: Monday, February 23, 2015 9:15 AM
Subject: Re: [EVDL] Cold Charging Lithium Experiences
I've heard this same thing but was not clear on how low of a rate. Does anyone
know? Around C/10? Or lower?
-ChrisChris' 1972 BMW 2002
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From: Michael Ross via EV <ev@lists.evdl.org>
To: Danpatgal <danpat...@yahoo.com>; Electric Vehicle Discussion List
<ev@lists.evdl.org>
Sent: Friday, February 20, 2015 6:03 PM
Subject: Re: [EVDL] Cold Charging Lithium Experiences
I have seen some of the research on this - if you charge slowly you can
avoid any plating. The issue is the electrolyte becomes vicious and the
ions pile up on the SEI outside the cathode. What I saw said the problem
was at -20C (-4F). But, I am not sure exactly what the cell construction
was, and particularly the electrolyte composition. There are umpteen
electrolyte recipes and they make a difference. One thin they do is use
lower boiling point electrolytes to improve cold performance. If the cell
is for a human implant you don't have to worry about it. Lot's of variety.
I think you should heat the pack, and charge as slowly as you can just to
be sure. Plating is really bad.
Mike
On Fri, Feb 20, 2015 at 3:25 PM, Danpatgal via EV <ev@lists.evdl.org> wrote:
> Reviving this thread as we're having another very cold stretch here in the
> Eastern US.
>
> My batteries (SE130 CALBs) are still going, but boy do they sag when it's
> cold like this. It's annoying.
>
> I've been charging when my BMS sensors (atop each cell) are over 0C, which
> they have generally remained over the past few weeks despite the cold
> (thankfully my garage generally stays above 0C).
>
> But, my follow-up question on all this is if the BMS measurement is good
> enough. For example, I guess there is resistive heat that gets generated
> upon charge/discharge/shunting that probably make the sensors read higher
> than the cells themselves. How much, I don't know.
>
> Does anybody have any thoughts, experience on this? We've gotten down to
> -20C with a HIGH today of only -10C ... yet I'm charging. I didn't really
> want to do it, but I was dragging so much on the road with low SOC%, I had
> to, or risk having to really limp home.
>
>
>
> -----
> Dan Gallagher
> http://www.evalbum.com/3854
>
> --
> View this message in context:
> http://electric-vehicle-discussion-list.413529.n4.nabble.com/Cold-Charging-Lithium-Experiences-tp4667675p4673895.html
> Sent from the Electric Vehicle Discussion List mailing list archive at
> Nabble.com.
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>
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