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EPA could lock in emissions rules before Trump takes office

The EPA and the Obama administration set lofty goals for lowering vehicle greenhouse gas emissions back in 2012. Under those terms, US automakers would have until 2025 to double fuel efficiency to 54.5 MPG which would lead to well over $1 trillion is fuel savings over the life of new cars. Of course, the plan would cost manufacturers $200 billion to meet that goal before the end of the 13-year term.

Today, the EPA proposed leaving those rules in place without any updates, citing technical analysis that shows automakers will be able to meet the deadline. In fact, the agency says those companies will be able to comply with the guidelines for the same cost — that $200 billion figure — or less than was expected in 2012. While the review found cause to raise the efficiency numbers even further, EPA Administrator Gina McCarthy said leaving the standards as is to help the auto industry plan for the years ahead.

The EPA further explained that if the new standards are fully implemented, 2012-2025 model year vehicles would keep 6 billion metric tons of greenhouse gases out of the environment over the life of those cars. A Bloomberg study earlier this year determined that EVs will cost the same as their gas-powered counterparts by 2025 which will certainly help cut down on emissions.

“It’s clear from the extensive technical record that this program will remain affordable and effective,” said McCarthy. “This proposed decision reconfirms our confidence in the auto industry’s capacity to drive innovation and strengthen the American economy while saving drivers money at the pump and safeguarding our health, climate and environment.”

Under the terms of the emissions proposal, the EPA had a midterm deadline of April 2018 to modify the timefram or details of the rules. After conducting a review, the agency found that automakers are implementing fuel efficiency and emissions-reducing tech much faster than expected. The EPA will hold a public comment period on the matter until December 30th. When that time is up, the agency will decide whether or not to lock in the 2022-2025 model year standards. That move could happen before President Obama leaves office on January 20th.

Of course, President-elect Trump could reverse or modify the guidelines once he arrives in the White House. Trump has been critical of President Obama’s environmental policies, so it wouldn’t be a surprise to see changes from from the new administration. If the EPA locks in the standards for 2025 though, it could make the task of updating them a bit more difficult.

Via: Reuters

Source: EPA (1), (2)

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Existing EV batteries could be recharged five times faster

Lithium-ion batteries have massively improved in the last half-decade, but there are still issues. The biggest, especially for EVs, is that charging takes too long to make them as useful as regular cars for highway driving. Researchers from the University of Warwick (WMG) have discovered that we may not need to be so patient, though. They developed a new type of sensor that measures internal battery temperatures and discovered that we can probably recharge them up to five times quicker without overheating problems.

Overcharging a lithium-ion battery anode can lead to lithium buildup, which can break through a battery's separator, create a short-circuit and cause catastrophic failure. That can cause the electrolyte to emit gases and literally blow up the battery, so manufacturers impose strict charging power limits to prevent it.

Those limits are based on hard-to-measure internal temperatures, however, which is where the WMG probe comes in. It's a fiber optic sensor, protected by a chemical layer that can be directly inserted into a lithium-ion cell to give highly precise thermal measurements without affecting its performance.

The team tested the sensor on standard 18650 li-ion cells, used in Tesla's Model S and X, among other EVs. They discovered that they can be charged five times faster than previously thought without damage. Such speeds would reduce battery life, but if used judiciously, the impact would be minimized, said lead researcher Dr. Tazdin Amietszajew.

Faster charging as always comes at the expense of overall battery life but many consumers would welcome the ability to charge a vehicle battery quickly when short journey times are required and then to switch to standard charge periods at other times.

There's still some work to do. While the research showed the li-ion cells can support higher temperatures, EVs and charging systems would have to have "precisely tuned profiles/limits" to prevent problems. It's also not clear how battery makers would install the sensors in the cells.

Nevertheless, it shows a lot of promise for much faster charging speeds in the near future. Even if battery capacities stayed the same, charging in 5 minutes instead of 25 could flip a lot of drivers over to the green side.

Via: Clean Technica

Source: University of Warwick

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