NA Sodium ION Batteries

[kochikame]

Hi all
How do you think about this new batts?
Anoyone did test them?
They told they would be cheaper but the fact is not like this, please check

Grade A 220ah 3.1v 210ah Sodium Ion Battery Energy Storage Battery Prismatic Sodium Ion Battery Sib Electrolyte Na Ion Cell - Buy Factory Sodium-ion Battery 280ah 3.0v 240ah 3.1v Na-ion Sib Battery Batterie 4000 Cycle Rechargeable Sodium Ion Battery,

Grade A 220ah 3.1v 210ah Sodium Ion Battery Energy Storage Battery Prismatic Sodium Ion Battery Sib Electrolyte Na Ion Cell - Buy Factory Sodium-ion Battery 280ah 3.0v 240ah 3.1v Na-ion Sib Battery Batterie 4000 Cycle Rechargeable Sodium Ion Battery,4000 Cycle 3.1v 3.2v 240ah 280ah Cells Na...

www.alibaba.com

 

[hwy17]

Voltage curve is wide. I don't think they will take off for DIY as long as lifepo4 is cheap.

 

[kochikame]

Voltage curve is wide. I don't think they will take off for DIY as long as lifepo4 is cheap.

is this the opinion of a self defined as anti-solar ? just I wonder while is in your avatar.

 

[upnorthandpersonal]

I've got a few in my lab for testing, but haven't had time yet. They look promising, but as usual they have their disadvantages as well. LFP still has a higher cycle life and has higher energy density. At low temperatures, NaI performs better.

 

[Boron]

Ive got some 18650 SiBs in for testing from Hikadi (Alix). They are printed on case as 1500mAh. Hmm. I recently set up a newly acquired ZKE ap20 battery tester (so far seems a nice piece of kit with neat PC Win 10/11 s/w drawing nice compact graphs etc. It does a full automatic CC disch + CC CV chrg). So takes some of the sweat out of routine testing of batteries (btw no good for NMH). Thanks to Andy @ offgridgarage for the heads up.

However what my new toy has shown me is a drastic lack of capacity vs what I was sold ie ca 1100mAh vs hype 1500mAh

This is quite a shock since Julian Illett rated these highly and was the first to get some last year. So I am confused - what have I got wrong?

Also something else I noticed is that the OC volts (4.0V) from full charge drops dramatically in a few secs on 0.7C 1A disch down to ca 3.5V.

This gives a usable range from 4.0V down to 2.5V. The curve is almost linear downwards (useful for EV app to easy determine SOC).

A lot of typical battery powered kit wont like this wide operating voltage (and ca 4:1 drop in power for my electric drill?). Here are a set of results showing a disch/chrg cycle


I also performed the IR test using the std meter Yaorea YR 1035+ which gave 19mohms @3.2V (so 1A discharge = 19mV, nowhere near the the initial Volt drop)
Hopefully if others adopt similar testing methods we will all be singing from the same page.
I have formed the impression that a lot of these "spec" figures are deliberately chosen to hype the product and give a false expectation of capacity. Unless you are in the exotic RC world where every last mAh counts, your application should be focusing in 80/20% (or maybe 90/10%) power band for realistic use. Coming from a tragic LAB stable where 50% DOD is the norm and realistic use given all deprecating factors
, such as age, ambient temp, %age C dischg etc. If you started with 100Ah - new then budget for 25Ah reliable use ( in the EV world), that how bad and overhyped AGMs are - bitter experience here.

 

[Lithiummoto]

I will be bringing in some 220Ah sodium cells soon. If anyone wants some, whats the going price + shipping ???
contact me if interested ( and serious )
How does that compare to your " cheaper " LFP cells ??