Tesla battery researcher shows new test results indicating batteries lasting over 2 million miles

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A Tesla battery researcher has shown updated test results indicating batteries lasting over 15,000 cycles or the equivalent of over 3.5 million km in an electric car.Last year, we reported on Jeff Dahn and his lab, who are contracted to research batteries for Tesla, posting an interesting article that shows how the latest Li-ion battery technology can produce batteries. that would last 1 million kilometers in electric vehicles.

In a new presentation, Dahn discussed the updated test results of this new battery, which he hopes will become the new standard Li-ion battery against which new battery technologies compete.

The scientist, who is widely recognized as a pioneer of Li-ion batteries, referred to our article last year on their paper and said it has sparked massive interest in this new chemistry and battery longevity.

They continued to test these batteries, some of them doing 3 years of testing and over 10,000 cycles:

Dahn now concludes that these batteries of a mid-range electric car could last over 3.5 million km or over 2 million miles.

He also showed results based on different depths of discharge, which means what percentage of capacity they discharge batteries to before recharging them, and he showed that Li-ion batteries performed extremely well after up to 15,000 cycles up to ‘now:

Even more impressively, batteries show very little to no capacity degradation when discharged to between 25% and 50% of capacity, which is actually how most people use their cars.

On average, American drivers use their vehicles less than 30 miles per day.

For example, with this battery in a Tesla vehicle with over 300 miles of range, you could use it to go 30 miles a day and charging, on average, 70-80% every day, it would do very little. , if at all. degradation of the battery.

Considering that this would mean that these batteries could last virtually forever or much longer than the actual useful life of a car, Dahn asks the question: do we really need batteries this good?

Tesla CEO Elon Musk said he plans to have batteries that will last over a million miles for the automaker’s ‘robotaxis’, which will have a much higher rate of use than vehicles. General public.

Musk has also mentioned in the past how essential longer lasting batteries are for other Tesla programs, such as Powerwalls, Powerpacks, and Tesla Semi-Electric Trucks.

Dahn also points out that these new, very long-lasting batteries could be useful to activate vehicle-to-grid functionality.

In the past, Tesla was reluctant to allow owners to use the batteries inside their cars to discharge energy into the grid due to the impact on battery longevity, but these new batteries would solve these problems.

Interestingly, Drew Baglino, one of Tesla’s top engineering leaders, recently mentioned that future Tesla vehicles will have two-way chargers allowing either grid-vehicle or vehicle-to-all technologies.

Dahn touched on several other interesting potential uses for batteries with extreme longevity and briefly commented on Tesla’s “Battery Day” in the presentation:

“Tesla is moving at the speed of light. They expand their factory. They know they are going to need terawatt hours of batteries for energy storage and vehicles. It is an incredibly exciting time. “

Here is Jeff Dahn’s new presentation in its entirety:

Taking Electrek

Very interesting and impressive new test results here.

It’s all the more interesting considering that longevity isn’t something Tesla talked about a lot during the Battery Day presentation.

It mainly focused on cost and scale, but Tesla has been guiding them for some time now that they make big improvements in longevity and a lot of those improvements seem to come from Jeff Dahn’s lab.

Older Tesla vehicles have already shown only limited battery degradation, and in general, batteries in Tesla vehicles already seem to hold up quite well, but it’s fascinating to think that in the near future longevity could be so large that it allows for new features and different use cases.

As usual, Jeff Dahn isn’t revealing if or when Tesla implements these changes, but with the company now making its own cells, I wouldn’t be surprised if the Tesla 4680 cells exhibit insane longevity.

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