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University of Michigan uses recycled Kevlar fiber to solve lithium-sulfur battery life cycle issues

(Credit: University of Michigan)

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The University of Michigan Chemical Sciences and Engineering team, led by Professor Nicholas Kotov, has developed a “new biologically inspired battery membrane” with recycled Kevlar fibers that could quintuple electric vehicle ranges and have a lifespan of 1,000 cycles.

The Ann Arbor, Michigan research facility is one of the best in the world, and Kotov, whose research focuses on the development of biomimetic nanocomposites, the self-assembly of nanoparticles, and chiral nanostructures, has worked to change the narrative on lithium-sulfur cells. “There are a number of reports claiming several hundred cycles for lithium-sulfur batteries, but it is achieved at the expense of other parameters—capacity, charging rate, resilience, and safety,” Kotov said in a press release from the University. “The challenge nowadays is to make a battery that increases the cycling rate from the former 10 cycles to hundreds of cycles and satisfies multiple other requirements including cost.”

Lithium-sulfur batteries can enable five times the capacity of standard lithium-ion cells, which are used in electric vehicles. However, as Professor Kotov mentioned in his quote, the lifespan is significantly decreased due to chemical reactions between molecules. The most common reason for reduced life cycles in lithium-sulfur batteries is dendrites, which are appendages that are designed to receive communications from other cells. These can pierce the membrane of cells, reducing the life span and thus the life cycle of a battery cell.

Another problem is polysulfides, or small molecules of lithium and sulfur, can form and flow to the lithium. They bond and cause blockages, reducing the effectiveness of the membrane. “The membrane is needed to allow lithium ions to flow from the lithium to the sulfur and back—and to block the lithium and sulfur particles, known as lithium polysulfides.”

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However, Kevlar, the same material used in bulletproof vests, can stop dendrites from penetrating the membrane using dense aramid fibers found in the material. The cells that Kotov and his team developed use recycled Kevlar fibers. The Kevlar “can enable lithium-sulfur batteries to overcome their Achilles heel of cycle life,” caused by the two previously mentioned reactions between molecules.

An example of the Kevlar system is shown in the images below, as the typical Celgard membrane on the left allows lithium polysulfides to flow through. The Kevlar membrane (right) blocked the polysulfides from traveling through.

“Just half an hour on, the Celgard membrane (left) leaks lithium polysulfides. However, the U-M membrane (right) completely blocks the lithium polysulfides 96 hours later. Image credit: Ahmet Emre, Kotov Lab.” Credit: University of Michigan

“Achieving record levels for multiple parameters for multiple materials properties is what is needed now for car batteries,” Kotov stated. Kotov added that the design of the lithium-sulfur batteries is “nearly perfect” due to its capacity and efficiency reaching theoretical limits. It can also behave more resiliently than lithium-ion cells in warm and cold weather climates, which both have effects on range and efficiency. However, fast charging could reduce the number of lifespans, Kotov added.

Lithium-sulfur batteries could be a good alternative as sulfur is more readily available and abundant than cobalt, which is controversial due to its mining practices. However, automakers like Tesla are reducing cobalt in their batteries vying for other metals, like nickel, instead. Sulfur’s low lifespan and instability, as it changes in size by 78 percent during charging, reduced the possibility of automakers using it in the past, The Independent reported.

The research was funded by the National Science Foundation and the Department of Defense.

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I’d love to hear from you! If you have any comments, concerns, or questions, please email me at joey@teslarati.com. You can also reach me on Twitter @KlenderJoey, or if you have news tips, you can email us at tips@teslarati.com.

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

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Tesla Full Self-Driving v14.3 rolls out: here’s what’s new

We are in EAP and will be on the road with v14.3 in the coming hours, so we’ll have a lot of things to discuss over the next few days, especially coming from v14.2.2.5, which I called the most “confusing” FSD release of all time.

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Tesla has officially started rolling out Full Self-Driving v14.3 to Early Access Program (EAP) members, and there are a lot of new improvements.

We are in EAP and will be on the road with v14.3 in the coming hours, so we’ll have a lot of things to discuss over the next few days, especially coming from v14.2.2.5, which I called the most “confusing” FSD release of all time.

Tesla brought out a lot of improvements, according to the v14.3 release notes, which list a vast number of fixes, new features, and new capabilities.

Here’s what Tesla’s release notes for the v14.3 release state:

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  • Improved parking location pin prediction, now shown on a map with a P icon.
  •  Increased decisiveness of parking spot selection and maneuvering.
  • Rewrote the Al compiler and runtime from the ground up with MLIR, resulting in 20% faster reaction time and improving model iteration speed.
  • Enhanced response to emergency vehicles, school buses, right-of-way violators, and other rare vehicles.
  • Mitigated unnecessary lane biasing and minor tailgating behaviors.
  • Improved handling of small animals by focusing RL training on harder examples and adding rewards for better proactive safety.
  • Improved traffic light handling at complex intersections with compound lights, curved roads, and yellow light stopping – driven by training on hard RL examples sourced from the Tesla fleet.
  • Upgraded the Reinforcement Learning (RL) stage of training the FSD neural network, resulting in improvements in a wide variety of driving scenarios.
  • Upgraded the neural network vision encoder, improving understanding in rare and low-visibility scenarios, strengthening 3D geometry understanding, and expanding traffic sign understanding.
  • Improved handling for rare and unusual objects extending, hanging, or leaning into the vehicle path by sourcing infrequent events from the fleet.
  • Improved handling of temporary system degradations by maintaining control and automatically recovering without driver intervention, reducing unnecessary disengagements.

Tesla also listed a handful of future improvements as well:

  • Expand reasoning to all behaviors beyond destination handling
  • Add pothole avoidance
  • Improve driver monitoring system sensitivity with better eye gaze tracking, eye wear handling, and higher accuracy in variable lighting situations

CEO Elon Musk has said that v14.3 could be “where the last big piece of the puzzle finally lands.” We have high expectations for this release because, in a lot of ways, v14.2’s final version was extremely disappointing and seemed to be a regression more than anything.

Nevertheless, Full Self-Driving v14.3 is going to be quite an interesting test, considering this is also the first time Musk has stated it will feel like the car will be “sentient.”

Reasoning will be a bigger piece of the puzzle with this release, although there were some elements of it in v14.2.

Tesla AI Head says future FSD feature has already partially shipped

We plan to travel plenty of miles with it over the next few days, so we’ll keep you posted on what our thoughts are.

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Tesla Model Y ownership review after six months: What I love and what I don’t

I pay about $25 more a month than I did for my Bronco Sport for my Tesla. It was a no-brainer to switch. Like any car, it isn’t perfect, but my Tesla has more things right than any other car I’ve owned, and that makes it truly incredible.

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Credit: Joey Klender

It has been just over six months since I took delivery of my Diamond Black Tesla Model Y Premium Long Range (at that time, it was called the Tesla Model Y Long Range All-Wheel-Drive).

In those six months, I have had the opportunity to experience true and pure electric vehicle ownership, what comes with it after driving a gas vehicle for my entire life, and, to be completely frank, there are not many things I would change.

Owning a Tesla was something I never thought I’d do until I owned a house, simply to take advantage of the advantage of home charging. However, I had to take the chance last year with the elimination of the $7,500 electric vehicle tax credit, as well as to avoid the mountainous stack of repair bills that were presenting themselves with my Ford Bronco Sport.

There are a lot of things I love about my Model Y, and there are a handful of things I wish I could change. In this piece, I plan to break down the ownership experience through about six months with my Tesla Model Y, hoping to provide you with enough insight to potentially make a change — or stick with what you have.

Things I Love About My Tesla Model Y

Driving Experience

Tesla really pushes Full Self-Driving and autonomy, but there are times that, as an owner, I feel I need to drive this car manually. Tesla put so much effort into the Model Y’s engineering and driving experience that it feels like a bit of a disservice to have it drive itself around all the time.

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The suspension in this vehicle, as well as its ability to handle sharp corners, its quick acceleration, and its ability to hug the road at spirited speeds, is truly something you need to feel for yourself. I personally have never had a car that was truly geared toward driving this way. Other than a short-lived ownership experience with a Honda Civic a few years back (something I won’t ever do again), all of my vehicles have been SUVs or compact crossovers.

Credit: Joey Klender

Having a car that offers both a fun driving experience and cargo space is what the Model Y truly is all about. It’s a fun car to drive, but it also has a lot of functionality.

It is always a treat when it’s a little warmer out, I can roll the windows down, and take my Model Y to a tight back road in Pennsylvania to have some fun. I have never loved driving in the traditional sense. I don’t hate it, but it’s not necessarily “fun” to me, but that’s probably because I never had a car that was engineered to make the driving experience enjoyable.

This has truly changed my perspective on driving, and the Model Y is probably the second-most-fun car I’ve ever had the pleasure of driving. The first? The Tesla Model S.

Home Charging and Supercharging

Now, Home Charging is relatively new to me, and I covered my process for figuring that out in another article, which is linked here.

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Waking up in the morning and having some additional range is really a great feeling — and with gas prices going through the stratosphere, the money I’m saving on gas is something quite special.

Supercharging is also a fun experience for me. Do I wish it were a faster experience? Sure. But there’s plenty to do in the car: Netflix, Hulu, Tesla Arcade, or head into whatever convenience store is nearby, use the restroom, and grab a bite to eat.

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I have come to enjoy the evenings that I’ll head over to the Supercharger and plug my car in for half an hour before a longer drive the next day (if I didn’t plug in soon enough at home and need some fast-charging).

Tesla also added a new Supercharging “Wrapped” feature at the end of the year, gamifying the entire Supercharging experience. I’m excited to see all the places I’ve charged at the end of 2026.

Sporty, Clean, and Fun Interior

The interior of my Tesla is probably one of the most underrated features of my car, but it’s definitely my favorite. With vehicles I’ve purchased in the past, the big selling point is the inside for me, not the outside. Of course, I want my car to look good to others, but ultimately, I’m paying the payment and I’m spending 100% of the time I’m using the car on the inside of it.

This highlights the need for a comfy, cozy, and capable cabin that has all the features I could want. In Pennsylvania, we have cold winters and hot and humid summers. The Model Y has heated seats and a steering wheel, as well as A/C seats. The HVAC is incredibly capable, customizable, and comfortable for all passengers, allowing them to make adjustments wherever needed.

At night, the black interior coupled with the accent lighting makes for one of the coolest, spaceship-like interiors on the market. Tesla always called it a “Rave Cave,” and it truly feels like it.

Tech: From Full Self-Driving to Other Features

Tech is really the biggest part of owning a Tesla; it is so advanced that it almost feels like it’s not even a car. Full Self-Driving is obviously such a huge advantage, and I’ve talked about it in great detail, both positively and negatively.

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I could write 1,000 words on FSD, but I don’t want to focus on it solely, because there are so many other things that need to be highlighted.

One thing Tesla really has over others is the ability to improve its cars continually. Simple features like a charging adjustment, new modes, or activating features that weren’t quite ready previously are all things Tesla has added through Over-the-Air updates.

I don’t know if I could pick just one as a favorite, but in the six months I’ve had my car, the most useful thing I’ve come across outside of FSD is Summon. While it is hit or miss a lot of the time, there are little features, like moving the car forward or back from the Tesla App, that are incredibly useful. Adjusting a park job, making snow shoveling around the car easier, or even moving the car slightly when I’m taking photos or video is incredibly seamless with this functionality.

Cargo and Interior Space

One of my big concerns when going from a Bronco Sport to a Model Y was cargo space, only to find out the Model Y has more space than the Bronco Sport. I always have something in the trunk, whether it is luggage, my golf bag, shoes, or groceries. I’ve never felt like I’ve needed more space in this car, although I’m sure that day will come when I get the boys together for a golf trip and I am driving.

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I’ve packed luggage for my Fiancèe and a few of her friends on a trip to Disney with no issues. Four girls going to Disney for five days is a challenge that will frighten even the most capable vehicles. I had no issues.

But what is also great about the Model Y is that it has the room to do other things, like fit an entire mattress for camping. SNUUZU makes an amazing Tesla mattress that I have thrown in the car to watch sunsets. This Summer, I’ll do some camping with it.

It’s one of the many things about this car that I really love.

Things About My Tesla Model Y I Do Not Love

Winter Range

There’s no getting around the fact that owning this car without a faster charging option at home in the winter is truly frustrating. I was charging much more frequently in January and February than in any other month.

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I took a 40-mile round-trip drive to grab some hot wings with friends in January. It took about 105 miles of range.

The cold weather was truly a frustrating time to own an EV, and my problems would have been solved with a Level 2 charger at home. Even still, the drives that were a few hours long were going to be fit with 10-15 minute stops to grab some range at a Supercharger.

Navigation

I really think that Tesla could have the best navigation out there. They always talk about licensing FSD, but if they were to license their Navigation software, I think it could overtake Apple Maps, Waze, and others. With a weather radar, live traffic updates, satellite imagery, and more, the Navigation system is truly the best around.

However, the Navigation itself, meaning the routing, is absolutely abysmal. It doesn’t learn from mistakes, it doesn’t learn more ideal routing, and it doesn’t seem to improve at any point. It still tries to leave my neighborhood by turning left out of a right-turn-only exit. It routinely takes some of the most head-scratching routes to local destinations.

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Consistently using the FSD disengage feature to report the problems to Tesla’s AI Team doesn’t seem to yield much of a result. It would be great if there were a “Learn” mode so that it could be less on Tesla to refine things, and the car would just learn automatically.

Cup Holders

This is a really trivial and nitpicky point of criticism, but boy, do these cupholders need to be larger. Many of my reusable water bottles do not fit in them, so I had to grab a $25 cup holder “adapter” from Amazon. It obstructs the center console from opening comfortably, but it is what it is. It fits standard cups, soft drink containers from fast food restaurants, and bottles of water, at least for the most part.

It would be nice if Tesla could think about something for the next Model Y refresh here, although I may be the only one to really complain about them.

Final Thoughts

I pay about $25 more a month than I did for my Bronco Sport for my Tesla. It was a no-brainer to switch. Like any car, it isn’t perfect, but my Tesla has more things right than any other car I’ve owned, and that makes it truly incredible.

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Sometimes I am still baffled that this is my car. It feels crazy to drive something that is so far ahead of any other car I’ve driven. Three of my friends own Teslas now, all of us bought them at the same time last year, and all four of us don’t know if we’d ever consider going back.

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Elon Musk’s Terafab project locks up massive new partner

Terafab, first revealed by Musk in March, is a massive joint-venture semiconductor complex planned for the North Campus of Giga Texas in Austin.

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Credit: SpaceX

Elon Musk’s Terafab project just locked up a massive new partner, just weeks after the new project was announced by Tesla, SpaceX, and xAI, the three companies that will be direct benefactors from it.

In a landmark announcement on April 7, Intel joined Elon Musk’s Terafab project as a key partner alongside Tesla, SpaceX, and xAI. The collaboration focuses on refactoring silicon fabrication technology to deliver ultra-high-performance chips at unprecedented scale.

Intel CEO Lip-Bu Tan hosted Musk at Intel facilities the prior weekend, underscoring the partnership’s momentum with a public handshake.

Terafab, first revealed by Musk in March, is a massive joint-venture semiconductor complex planned for the North Campus of Giga Texas in Austin. Valued at $20–25 billion, it aims to consolidate the entire chip-making pipeline, design, fabrication, memory production, and advanced packaging in a single location. It should eliminate a majority of Tesla’s dependence on third-party chip fab companies.

The facility will manufacture two primary chip types: energy-efficient edge-inference processors optimized for Tesla’s Full Self-Driving (FSD) systems, Cybercab and Robotaxi, and Optimus humanoid robots, and high-power, radiation-hardened variants for SpaceX satellites and xAI’s orbital data centers.

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Elon Musk launches TERAFAB: The $25B Tesla-SpaceXAI chip factory that will rewire the AI industry

The project’s audacious goal is to produce 1 terawatt (TW) of annual compute capacity, roughly 50 times current global AI chip output.

Production is expected to begin modestly and scale rapidly, addressing Musk’s warning that chip supply could soon become the biggest constraint on Tesla, SpaceX, and xAI growth. By vertically integrating manufacturing tailored to their exact needs, Terafab eliminates supply-chain bottlenecks and accelerates iteration for AI training, inference at the edge, and space-based computing.

Intel’s participation is strategically vital. The company will contribute expertise in advanced process technology, high-volume fabrication, and packaging to help Terafab achieve its aggressive targets. For Intel, the deal strengthens its foundry business and positions it as a critical U.S. player in the AI hardware race.

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For Musk’s ecosystem, it secures domestic, purpose-built silicon at a time when global capacity meets only a fraction of projected demand for hundreds of millions of robots and orbital AI infrastructure.

This is the latest chapter in Intel-Tesla ties. In November 2025, Musk publicly stated at Tesla’s shareholder meeting that partnering with Intel on AI5 chips was “worth having discussions,” amid concerns about TSMC and Samsung capacity.

Exploratory talks followed, with Intel eyeing custom-AI opportunities. The Terafab integration transforms those conversations into concrete collaboration.

The Intel-Terafab alliance carries broader implications. It bolsters U.S. semiconductor sovereignty, drives innovation in cost- and power-efficient AI silicon, and supports Musk’s vision of exponential progress in autonomy, robotics, and space.

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As AI compute demand surges, this partnership could reshape the industry, delivering the silicon backbone for a new era of intelligent machines on Earth and beyond.

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