How to Prolong Lithium-based Batteries - Battery University

[mkjayakumar]

Excellent article that answers a lot of questions.

http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries" onclick="window.open(this.href);return false;

 

[mkjayakumar]

That article says some of the things that we already know here through emperical evidence Two reasons that have a significant impact on the battery capacity:

- Keeping the battery at a high SoC for prolonged periods
- High temperature

It covers a variety of scenarios such as impact due to fast charging. Excellent work, highly relevant to Leaf owners.

 

[AndyH]

This site is very generic and very out of date. Use it for general info if one wants to compare/contrast lithium, lead, and nickle, but don't expect any of the info to give details on the Leaf battery.

Lithium R&D is going much quicker than books and websites can keep up - 5+ year old info about 'lithium' on a website might as well be filed under 'history'...

 

[GregH]

I just stumbled on this site... very interesting.
What I found most shocking was the degradation table based on 1yr at various temperatures and SOCs..
http://batteryuniversity.com/learn/article/how_to_store_batteries
Specifically, lithium capacity after one year @
25 degrees C and 40%SOC: 96%
25 degrees C and 100%SOC: 80%
40 degrees C and 40%SOC: 85%
40 degrees C and 100%SOC: 65%
And not too surprising, 60 degrees C *AND* 100%SOC... 60% AFTER 3 MONTHS (!)

Now the Leaf never sees 100% (4.2V) but this makes me wonder how much better 80% (4.05V) is than "full" (4.10V)?
40% btw 3.75V...
Does anyone know of a larger two dimensional table (temperatures, SOC/voltage) showing how fast degradation happens at various temps and voltages?
Preferably for the lithium manganese variety specifically..

 

[WetEV]

What I found most shocking

Lithium ion isn't a complete description of battery chemistry. And the Leaf's batteries are not Li-cobalt, they are Li-manganate, so don't get too worried.