Tesla’s New Battery could Roll up a Million Miles

Earlier this year, Musk said that they built Model 3 to last as long as a commercial truck, a million miles, and the battery modules should last between 300,000 miles and 500,000 miles.

However, the CEO claims that Tesla has a new battery coming up next year that will last a million miles.
Jeff Dahn and his lab, who are doing battery research for Tesla, have released test results for an impressive new battery cell that is going to be Tesla’s new million-mile battery, according to a source familiar with the matter.

The new battery tested is a Li-Ion battery cell with a next-generation “single crystal” NMC cathode and a new advanced electrolyte.

Dahn’s team have been extensively testing these cells and based on the results, they think that the battery could power an electric car “for over 1.6 million kilometers (1 million miles).”

We are talking about battery cells that last two to three times longer than Tesla’s current battery cells.
They have tested the battery cells under different conditions and cycles. Even at the extreme temperature of 40’C, these cells were lasting 4000 cycles.

With an active cooling system, like in Tesla’s battery pack, it was pushing the battery cells to over 6,000 cycles, which would easily mean over 1 million miles in a good battery pack.

Controlling the charge to less than 100% state-of-charge also helps push the longevity.
In the research paper, Dahn’s team especially reference that this new longevity potential would be particularly good for ‘robo taxis’:

“This situation may change with the proposed introduction of “robo taxis”, long haul electric trucks and vehicle-to-grid applications. In the former, vehicles will be driving all day, much like a conventional taxi and undergoing nearly 100% DOD cycling. Long haul trucks will almost certainly run in near 100% DOD situations.

Cells in vehicles tethered to the grid will be racking up charge-discharge cycles even when the vehicle is not moving. Clearly EVs destined for vehicle-to-grid applications, robo taxis or long haul trucking, would favor a lithium-ion chemistry that could deliver many more charge-discharge cycles in a decade than an EV that was destined for typical commuter driving where high energy density to give the longest driving range for weekend trips might be emphasized.

Electric buses represent another application where duty cycles approaching 100% DOD are used on a daily basis.”

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