Connect with us

News

Tesla battery researchers open path to all-electric range extender concept

Published

on

Tesla has solidified itself as an industry leader when it comes to electric vehicles and their range. However, an EV’s range could always be improved, and the company has taken great efforts to make this possible. One of these was outlined by Tesla’s battery researchers, who recently published the results of a test that cycles lithium metal on graphite to form hybrid lithium-ion/lithium metal cells. This particular innovation could open the door to an all-electric range extender.

Other automakers have used range extenders in the past, but they’ve been comprised of small petrol-powered engines that are used as a generator to recharge the vehicle’s battery pack when it is low on range. The process of cycling lithium metal on graphite, on the other hand, could lead to a 20% higher energy density than the traditional lithium-ion cells that power the Tesla’s vehicles.

Tesla’s battery research team, led by Jeff Dahn of Dalhousie University, has found a way to create a range extender of sorts without having to keep a small gas engine in the vehicle. Tesla detailed its findings in a research paper that was published to ScienceDirect on April 30. Titled “Cycling Lithium Metal on Graphite to Form Hybrid Lithium-Ion/Lithium Metal Cells,” Dahn and his researchers outlined the testing process.

The findings proved a possible 20% increase in range when using the range extender, which is comprised of “hybrid cells” that use Lithium-Ion and Lithium Metal. The cells also used an optimized electrolyte, and pressure enabled reversible plating on graphite.

The paper states:

Advertisement

“A hybrid anode cell design is proposed involving lithium metal plating on top of graphite that provides a 20% increase in energy density over conventional lithium-ion cells. Pouch cells with hybrid graphite-lithium metal anodes cycled with conventional electrolytes fell below 80% capacity in under 15 cycles. However, with a dual-salt electrolyte and applied mechanical pressure optimized for lithium metal cycling, hybrid cells achieved over 150 full (100% utilization) cycles before falling below 80% capacity with a CE of 99.6% for lithium metal plating on graphite.

“We also found that intermittent high energy (100% utilization) cycles utilizing lithium metal can be dispersed among hundreds of conventional lithium-ion cycles where only the graphite is utilized. Operating the cell with this intermittent protocol shows minimal impact to the underlying graphite capacity. Therefore, these hybrid cells can operate well in “lithium-ion mode” with periodic high energy full cycles accessing the lithium metal capacity.”

Tesla’s new findings show that increased energy density is made possible with the hybrid concept. When combining lithium-ion cells with lithium metal, energy density improves as the graphite anode utilized in traditional lithium-ion cells is not capable of handling the increased energy. The utilization of a dual-salt electrolyte also increases density and decreases battery cell degradation.

Tesla’s battery researchers described the advantages of the hybrid lithium-ion/lithium metal cells in the discussion below.

“If an electric vehicle with a conventional lithium-ion battery can deliver a range of 400 km, then hybrid cells could enable a range of 480 km. By capping the upper cut-off voltage of hybrid cells to operate in lithium-ion mode, the average cell voltage and delivered capacity will decrease. As a result, operating a hybrid cell in lithium-ion mode delivers an energy density of 530Wh/L, about 25% less than a conventional lithium-ion cell.

Advertisement

“This would result in a range of 300 km. In a study of driving behavior for EVs, Smart et al.34 showed that only 1% of daily trips are longer than 325 km on average. Therefore, operating hybrid cells most of the time in lithium-ion mode enabling a range of 300 km, while periodically using the lithium metal portion for long > 400 km trips, as mimicked by this testing protocol, should be viable for most drivers.”

It should be noted that the Tesla battery researchers’ study is only in their initial stages. Thus, it may take some time before the technology gets rolled out to Tesla’s fleet. The wait would likely be worth it though, as the hybrid cells could open the door to all-electric vehicles with range extender features. This would be incredibly useful for electric vehicle owners who take long road trips with family, and it could also be a notable step towards EVs gaining range parity with their petrol-powered counterparts.

Joey has been a journalist covering electric mobility at TESLARATI since August 2019. In his spare time, Joey is playing golf, watching MMA, or cheering on any of his favorite sports teams, including the Baltimore Ravens and Orioles, Miami Heat, Washington Capitals, and Penn State Nittany Lions. You can get in touch with joey at joey@teslarati.com. He is also on X @KlenderJoey. If you're looking for great Tesla accessories, check out shop.teslarati.com

Advertisement
Comments

News

Robotaxis are already making roads safer, Waymo report reveals

Waymo Driver is already reducing severe crashes and enhancing the safety of vulnerable road users.

Published

on

Waymo hires former Tesla Executive 
(Credit: Waymo)

Industry leaders such as Elon Musk have always maintained that autonomous robotaxis will make roads safer. A recent blog post from Waymo about the safety of its self-driving cars suggests that Musk’s sentiments are on point.

Way More Safety

Waymo Driver is already reducing severe crashes and enhancing the safety of vulnerable road users. As per a new research paper set for publication in the Traffic Injury Prevention Journal, Waymo Driver had outperformed human drivers in safety, particularly for vulnerable road users (VRUs).

Over 56.7 million miles, compared to human drivers, Waymo Driver achieved a 92% reduction in pedestrian injury crashes. It also saw 82% fewer crashes with injuries with cyclists and 82% fewer crashes with injuries with motorcyclists. Waymo Driver also slashed injury-involving intersection crashes by 96%, which are a leading cause of severe road harm for human drivers. Waymo Driver saw 85% fewer crashes with suspected serious or worse injuries as well.

What They Are Saying

Mauricio Peña, Waymo’s Chief Safety Officer, was optimistic about Waymo Driver’s results so far. “It’s exciting to see the real positive impact that Waymo is making on the streets of America as we continue to expand. This research reinforces the growing evidence that the Waymo Driver is playing a crucial role in reducing serious crashes and protecting all road users,” the Chief Safety Officer noted.

Jonathan Adkins, Chief Executive Officer at Governors Highway Safety Association, also noted that Waymo’s results are very encouraging. “It’s encouraging to see real-world data showing Waymo outperforming human drivers when it comes to safety. Fewer crashes and fewer injuries — especially for people walking and biking — is exactly the kind of progress we want to see from autonomous vehicles,” Adkins stated.

Advertisement
Continue Reading

Elon Musk

Tesla hints at June 1 launch of Robotaxi platform in Austin

Tesla has hinted at a potential launch date for the Robotaxi service in Austin, Texas.

Published

on

tesla robotaxi app on phone
Credit: Tesla

Tesla just dropped its biggest hint yet about the potential launch date of its Robotaxi ride-hailing platform in Austin, Texas, shedding more light on when to expect it to take off.

In preparation for the ride-hailing service to launch, Tesla has been in talks with the City of Austin for months. It has also spent recent months bolstering its Full Self-Driving suite, aiming for it to handle initially supervised rides with the use of teleoperators to keep things safe and dependable, at least early on.

The company has also said that it expects the Robotaxi service, which will drive passengers in Tesla Model Y vehicles to start, to launch in Austin in June. However, Tesla has not given an exact date.

Now, Tesla is hinting that Robotaxi could launch on June 1, based on a very vague X post it published on May 1:

Of course, this is extremely speculative. However, it’s the first time Tesla has made any suggestions about a potential launch date, so it’s worth taking it seriously.

While the automaker has often missed timelines in the past, most notably the launch of a “feature-complete” Full Self-Driving platform, this is the first time we’ve seen Tesla be so adamant and truly reiterate a target date.

Tesla has not shied away from this June date for the Robotaxi launch yet, something that is worth noting as we move closer to June. All signs point toward Tesla being able to come through on this timeline, and it could be one of its biggest accomplishments yet on the grand scheme of things. The Robotaxi rollout will be controlled and small to start, the company noted on its most recent Earnings Call.

CEO Elon Musk said:

“The team and I are laser-focused on bringing robotaxi to Austin in June. Unsupervised autonomy will first be solved for the Model Y in Austin.”

At first, it also seems as if the first Robotaxi rides will be available to a select group, as Musk said the ability to order one will not be available to the general public until later in the month. He also said the initial fleet will be between 10 and 20 vehicles:

“Yeah. We’re still debating the exact number to start off on day one, but it’s, like, I don’t know, maybe 10 or 20 vehicles on day one. And watch it carefully. They scale it up rapidly after that. So, we want to make sure that you’re paying very close attention the first time this happens. But, yeah, you will be able to — end of end of June or July, just go to Austin and order a Tesla for autonomous drive.”

While the June 1st date of the Robotaxi launch is extremely speculative, Tesla seems convinced that its vehicles could already handle this task. It would be something to see them come through on this date, especially on the first day of the month.

Continue Reading

News

Is the affordable Tesla Model Y’s features hiding in plain sight?

Variants of the Model Y that could bring down the vehicle’s price would likely be appreciated by consumers.

Published

on

Credit: Joey Klender/Teslarati

Just recently, rumors emerged in China suggesting that a more affordable Tesla Model Y variant internally dubbed the ”E80” would be produced in Giga Shanghai this May. A look at Tesla’s current affordable vehicles suggests that the features of the upcoming Model Y variant may be hiding in plain sight.

Model Y “E80” Rumors

Reports from Chinese publications suggested that the affordable Model Y “E80” will be a stripped down version of the new Model Y. Thus, the vehicle may be equipped with smaller wheels, single-layer windows on its sides, no rear display, half the number of speakers, single-color ambient interior lighting, fabric seats with no heating or ventilation functions, and a manual trunk.

These reductions, the rumors suggested, would allow Tesla China to offer the Model Y “E80” at an affordable price of 190,000–210,000 ($26,000–$28,800). Other rumors suggested that the vehicle will be priced even more aggressively, at around 150,000-170,000 yuan ($20,500-$23,300). 

Hiding in Plain Sight

What is quite interesting about the Model Y “E80” rumors is the fact that Tesla has actually released stripped-down versions of its vehicles to make them more affordable. Based on the features that were bundled in these vehicles, one could make an inference about the features that the Model Y “E80” will have, at least considering its rumored aggressive pricing.

In August last year, Tesla Mexico launched a variant of the Model 3 sedan that is quite unlike the vehicle’s base variant in the United States. The vehicle was priced at MXD 749,000 (USD 40,000), which was MXD 50,000 (USD 2,670) lower than the Model 3 RWD’s previous price in Mexico, which stood at MXD 799,000 (USD42,730).

Advertisement

With its more affordable price, Tesla Mexico’s base Model 3 featured textile seats instead of vegan leather, acoustic glass only on its front windows, and no secondary display for rear passengers. Its ambient lights were also limited to just white. Lastly, the vehicle did not have heated or cooled seats or a heated steering wheel. These reductions are very similar to the rumored feature set of the Model Y “E80” in China.

The Tesla Cybertruck Long Range Rear Wheel Drive is another base variant that could provide hints at the affordable Model Y’s features. Similar to Tesla Mexico’s base Model 3, the Cybertruck LR RWD features textile seats and no second-row display. Interestingly enough, the Cybertruck LR RWD is $10,000 cheaper than the Cybertruck. That’s similar to the rumored price difference between the new Model Y in China and the vehicle’s supposed affordable “E80” variant.

Still Compelling Enough?

Perhaps the biggest question at this point would be if the rumored Model Y “E80,” even with its stripped-out features, will be compelling enough for consumers. While such concerns are valid, one must not forget that the Model Y is still a premium vehicle.

Thus, variants of the Model Y that could bring down the vehicle’s price would likely be appreciated by consumers. The fact that the rumored “E80” will be produced in Giga Shanghai speaks volumes as well, especially since China is home to the most competitive EV market in the world. Giga Shanghai also exports vehicles to several territories worldwide.

Advertisement
Continue Reading

Trending