Scientists Confirm High Temperatures Permanently Shorten Life of Lithium-Ion Batteries

4 years ago by Eric Loveday 4

Nissan LEAF's 24 kWh Battery Pack Now Comes With A Much-Anticipated Warranty Due to Issues With Heat-Related Range Loss in the Southwest

Nissan LEAF’s 24 kWh Battery Pack Now Comes With A Much-Anticipated Warranty Due to Issues With Heat-Related Range Loss in the Southwest

Remember the story of Nissan LEAFs struggling to cope with the heat in Arizona and Nissan responding by warrantying battery capacity to remain above 70 percent?

Thermometer...Nuff Said

Thermometer…High Heat and Lithium-Ion Aren’t Friends

Well, it seems there’s now scientific proof that lithium-ion batteries can’t cope with the heat.

Scientists presented a comprehensive lithium-ion battery study at the 245th National Meeting & Exposition of the American Chemical Society (ACS) held in New Orleans this week.  Findings from this battery life study confirm what owners of the LEAF are experiencing in warm climates.

Mikael G. Cugnet, a PhD, spoke on the topic of battery longevity:

“The battery pack could be used during a quite reasonable period of time ranging from 5 to 20 years depending on many factors.  That’s good news when you consider that some estimates put the average life expectancy of a new car at about eight years.”

Cugnet explained that the lifespan depends mainly on a few variables:

  • Battery temperature
  • State of charge
  • Charge protocol

Cugnet continued by explaining how battery life and performance suffers as the mercury rises.   According to Cugnet, as temperatures exceed 86 degrees Fahrenheit, lithium-ion batteries begin to suffer ill effects.

Cugnet stated:

“The higher the temperature, the lower the battery service life.  A temperature above 86 degrees F affects the battery pack performance instantly and even permanently if it lasts many months like in Middle East countries.”

Cugnet further suggested that battery charge plays a big role in determining longevity in warm climates.   As Cugnet stated, a fully-charged battery is more vulnerable at temperatures above 86 degrees F.

Cugnet’s findings come from data gleaned from real-world use of an electric vehicle and simulated lifetime cycles of draining and recharging. The research team considered a battery to be beyond its useful life when its capacity had fallen by 20 percent.

Of course, we’d prefer to have several studies on this matter before we present a grand conclusion, but the findings here suggest that heat is definitely not friendly to lithium-ion batteries.

via ACS

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4 responses to "Scientists Confirm High Temperatures Permanently Shorten Life of Lithium-Ion Batteries"

  1. Mark H says:

    Stuff we already know but always worth repeating.
    1) Thermal management systems are not overkill.
    2) A well designed battery does not charge to full range at least at temps over 85 degrees F
    3) Parking in a garage, awning, carport, parking deck, or even under a tree is good for your battery
    4) Keep your battery plugged in so your thermal management system can protect your battery.
    5) Until the technology advances, see number 1.

  2. Randy says:

    Is there anymore information available on how the study was conducted? I would be interested to see the actual procedures and how the tests were set up. There have been some other studies that suggest the higher temperatures are not that bad for the batteries but I believe they were only charging the battery to half capacity.

  3. Dave R says:

    Duh?

    It is well known that lithium batteries degrade faster at higher temperatures, it’s effects can be approximated by using the arrhenius equation which states that for every increase in temperature of 10C, the battery will degrade about twice as fast.

    Now at some temperature different chemical reactions may occur which speeds up the rate of degradation faster than the arrhenius equation predicts, but this temperature varies depending on the specific lithium chemistry in question.

    BTW – the link/source/reference is broken.

  4. MrEnergyCzar says:

    Drive a Volt…

    MrEnergyCzar