This caught my eye
https://www.designnews.com/materials/wi ... 0601859495
Will Future EVs Only Have a Five-Year Battery Life?
Fast-charging and nickel-rich chemistries will accelerate degradation of future EV batteries, expert says
According to Asad Farid of Berenberg Bank, future EV batteries are likely to need replacement after just five years of use. “People believe their battery degradation will be similar to that of the Tesla,” he said (see graph on left). “But we think battery degradation will remain similar to the case of the Leaf going forward” (see graph on right). (Image source: Berenberg Bank)
•First, he said, there’s a shift toward high-nickel cell chemistries in NMC (lithium nickel manganese cobalt oxide) and NCA (lithium nickel cobalt aluminum oxide) batteries. Those nickel-rich chemistries have shown a lower cycle life of 2,000 charges (for NMC) and 1,000 charges (for NCA). In contrast, the lithium iron phosphate batteries commonly used in China typically hit more than 3,000 cycles. In a paper published earlier this year, Farid contended that the move to high-nickel chemistries is caused by the growing desire for greater driving range. Unfortunately, the move to higher energy density (greater range) comes at the expense of longevity, he wrote.
•Second, a shift toward faster charging speeds will reduce life expectancy, he said. Today, many utilities are installing DC fast-charge stations rated at 50 kW, 150 kW, and even 350 kW. And while such stations can charge big batteries in as little as 20 minutes, they also generate heat that can lead to decomposition of the battery’s anode and cathode. “When you triple the speed of charging, your battery degradation will also increase,” Farid said.
•Third, the use of air-cooling leads to faster battery degradation, he said. Today, some OEMs are choosing to use passive air-cooled systems instead of more expensive liquid cooling, but such systems trap more heat in the cells. Farid said that the degradation rate with air cooling is more than double that of dynamic, liquid-cooled batteries.