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An ultra-thin smart filter can significantly extend EV battery lifespan

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An ultra-thin smart filter can significantly extend EV battery lifespan


Car manufacturers and others are working intensively to develop lightweight, safe, and powerful batteries. The photo is from Volkswagen’s battery company PowerCo, which has built large factories in Germany, Spain, and Canada to produce high-quality battery cells. Credit: Volkswagen AG

Car manufacturers and others who need light, safe, powerful batteries are eager to adopt lithium-sulfur (Li-S) batteries. Not only do they store more energy, and are safer and faster to charge than today’s lithium-ion batteries—they’re cheaper to make, too.

It’s just that these next-generation wonder batteries have one big problem: They wear out very quickly. The reason is that they suffer from what is called the shuttle effect.

“It’s about chemical substances, lithium polysulfides (LPS), that are formed when the is in operation. The substances move between the electrodes, the positive anode and the negative cathode, in the battery. It is these substances that cause LiS batteries to degrade quickly, lose capacity and have a short lifespan,” said Önder Tekinalp, a postdoctoral fellow at NTNU’s Department of Chemical Engineering.

This also explains why this type of battery has not yet moved into our electric cars.

New, thin, smart filter

Tekinalp and his colleagues have developed a super-thin coating with very special properties that can change this. They have patented the coating via a project called HiSep-II. The coating has been given the same name as the project.

Inside a battery is also a separator. There is a partition between the electrodes, which makes it work effectively and prevents short circuits. When the HiSep II coating is placed on the outside of the wall, it acts as a smart filter.

This could make today’s heavy electric vehicle batteries lighter, safer and increase their range. The researchers behind the technology believe it is also ideal for use in aviation, space travel, drones and shipping.

Many people working to improve lithium-sulfur batteries concentrate on pure chemistry in cathode and electrolytes. The NTNU researchers have thus focused on the partition instead.

“The coating blocks the harmful chemical substances and allows useful lithium ions to pass freely,” Tekinalp said.

Slimmer, lighter battery pack

The lifespan of a battery is often measured in charge cycles. One cycle is the same as one full charge and one full discharge. The tests from the lab at Gløshaugen show that lithium-sulfur batteries equipped with HiSep-II can increase the number of charging cycles from 200 to 1,000. That lengthens the battery life by a factor of five.

The battery pack in an electric car consists of many parts. The researchers say the can slim down an 800-volt battery pack by more than 200 kilograms. That, in turn, means significantly better efficiency and a much longer range. The fact that this next generation of electric car batteries are made from sulfur, of which there is a lot, also makes them cheap to produce.

‘Real alternative for electric cars’

Tekinalp believes their research is a breakthrough, which will contribute to making lithium-sulfur batteries a real alternative for electric cars.

“Although HiSep-II has not yet been used in electric cars, we have shown that it can handle the shuttle effect. It has been the major brake on commercial exploitation—until now,” says the researcher.

HiSep-II patented the separator in 2023, and is working with NTNU Technology Transfer (TTO) to get it to the market.

“The goal is to scale up the technology and license it to an industrial partner so that it can be used in everything from electric cars to storage of green energy,” says Kristina Nydal, a business developer at TTO.

She believes Hi-Sep II can contribute to increased battery safety, and says that the technology is ideal for use in areas such as aviation, aerospace, , drones and maritime transport.

“It is also an attractive and cost-effective alternative for storing energy. Especially where longevity and stability are crucial factors,” she said.

The production process is environmentally friendly, the technology is designed to be easily scaled up, and it can work with today’s lithium-based batteries.

Scaling up and testing

Before they are ready for the market, external players must test the technology. The filter must be built into Li-S batteries, and its performance must be checked and confirmed by an independent third party. Documenting that the technology is reliable and stable in the long term is crucial. They must also ensure that the new smart filter can be produced safely, economically profitably and with consistent quality.

Patent processes cost a lot and should be adapted to the industrial use of the technology. TTO is now looking for an interested licensee who can finance further patenting and commercialization and participate in the planned tests.

When asked how the technology stands apart from sulfur batteries, Tekinalp replied, “Many Li-S breakthroughs focus on improving cathode materials or electrolytes. The HiSep-II targets the separator, or filter, alone. It is a simpler, more scalable solution without the use of complex materials. The is environmentally friendly, the technology is designed to be easily scaled up, and it can work together with today’s lithium-based batteries.”

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This Jammer Wants to Block Always-Listening AI Wearables. It Probably Won’t Work

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This Jammer Wants to Block Always-Listening AI Wearables. It Probably Won’t Work


Deveillance also claims the Spectre can find nearby microphones by detecting radio frequencies (RF), but critics say finding a microphone via RF emissions is not effective unless the sensor is immediately beside it.

“If you could detect and recognize components via RF the way Spectre claims to, it would literally be transformative to technology,” Jordan wrote in a text to WIRED after he built a device to test detecting RF signatures in microphones. “You’d be able to do radio astronomy in Manhattan.”

Deveillance is also looking at ways to integrate nonlinear junction detection (NLJD), a very high-frequency radio signal used by security professionals to find hidden mics and bugs. NLJD detectors are expensive and used primarily in professional contexts like military operations.

Even if a device could detect a microphone’s exact location, objects around a room can change how the frequencies spread and interact. The emitted frequencies could also be a problem. There haven’t been adequate studies to show what effects ultrasonic frequencies have on the human ear, but some people and many pets can hear them and find them obnoxious or even painful. Baradari acknowledges that her team needs to do more testing to see how pets are affected.

“They simply cannot do this,” engineer and YouTuber Dave Jones (who runs the channel EEVblog) wrote in an email to WIRED. “They are using the classic trick of using wording to imply that it will detect every type of microphone, when all they are probably doing is scanning for Bluetooth audio devices. It’s totally lame.” Baradari reiterates that the Spectre uses a combination of RF and Bluetooth low energy to detect microphones.

WIRED asked Baradari to share any evidence of the Spectre’s effectiveness at identifying and blocking microphones in a person’s vicinity. Baradari shared a few short videoclips of people putting their phones to their ears listening to audioclips—which were presumably jammed by the Spectre—but these videos do little to prove that the device works.

Future Imperfect

Baradari has taken the critiques in stride, acknowledging that the tech is still in development. “I actually appreciate those comments, because they’re making me think and see more things as well,” Baradari says. “I do believe that with the ideas that we’re having and integrating into one device, these concerns can be addressed.”

People were quick to poke fun at the Spectre I online, calling the technology the cone of silence from Dune. Now, the Deveillance website reads, “Our goal is to make the cone of silence become reality.”

John Scott-Railton, a cybersecurity researcher at Citizen Lab, who is critical of the Spectre I, lauded the device’s virality as an indication of the real hunger for these kinds of gadgets to win back our privacy.

“The silver lining of this blowing up is that it is a Ring-like moment that highlights how quickly and intensely consumer attitudes have shifted around pervasive recording devices,” says Scott-Railton. “We need to be building products that do all the cool things that people want but that don’t have the massive privacy- and consent-violation undertow. You need device-level controls, and you need regulations of the companies that are doing this.”

Cooper Quintin, a senior staff technologist at the Electronic Frontier Foundation, echoed those sentiments, even if critics believe Deveillance’s efforts to be flawed.

“If this technology works, it could be a boon for many,” Quintin wrote in an email to WIRED. “It is nice to see a company creating something to protect privacy instead of working on new and creative ways to extract data from us.”



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I’ve Tried Every Pixel Phone Ever Made—Here Are the Best to Buy Right Now

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Portrait Light: You can change up the lighting in your portrait selfies after you take them by opening them up in Google Photos, tapping the Edit button, and heading to Actions > Portrait Light. This adds an artificial light you can place anywhere in the photo to brighten up your face and erase that 5 o’clock shadow. Use the slider at the bottom to tweak the strength of the light. It also works on older Portrait mode photos you may have captured. It works only on faces.

Health and Accessibility Features

Cough & Snore Detection (Tensor G2 and newer): On the Pixel 7 and newer, you can have your Pixel detect if you cough and snore when sleeping, provided you place your Pixel near your bed before you nod off. This will work only if you use Google’s Bedtime mode function, which you can turn on by heading to Settings > Digital Wellbeing & Parental Controls > Bedtime Mode.

Guided Frame (Tensor G2 and newer): For blind or low-vision people, the camera app can now help take a selfie with audio cues (it works with the front and rear cameras). You’ll need to enable TalkBack for this to work (Settings > Accessibility > TalkBack). Then open the camera app. It will automatically help you frame the shot.

Simple View: This mode makes the font size bigger, along with other elements on the screen, like widgets and quick-settings tiles. It also increases touch sensitivity, all of which hopefully makes it easier to see and use the screen. You can enable it by heading to Settings > Accessibility > Simple View.

Safety and Security Features

Theft Protection: This is a broader Android 15 feature, but essentially, Google’s algorithms can figure out if someone snatches your Pixel out of your hands. If they’re trying to get away, the device automatically locks. Additionally, with another device, you can use Remote Lock to lock your stolen Pixel with your phone number and a security answer. To toggle these features on, go to Settings > Security & privacy > Device unlock > Theft protection.

Identity Check: If your Pixel detects you’re in a new location, Identity Check will require your fingerprint or face authentication before you can make any changes to sensitive settings, offering extra peace of mind in case you lose your phone or if it’s stolen. You can enable this in Settings > Security & privacy > Device unlock > Theft protection > Identity Check.

Courtesy of Google

Private Space: Another Android 15 addition, Pixel phones finally have a feature that lets you hide and lock select apps. You can use a separate Google account, set a lock, and install any app to hide away. To set it all up, head to Settings > Security & privacy > Private space.

Satellite eSOS (Pixel 9 and Pixel 10 series, excluding Pixel 9a): Like Apple’s SOS feature on iPhones, you can now reach emergency contacts or emergency services even when you don’t have cell service or Wi-Fi connectivity. It’s not just available in the continental US, but also in Hawaii, Alaska, Canada, and even Europe.



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I’ve Tried Every Pixel Phone Ever Made—Here Are the Best to Buy Right Now

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I’ve Tried Every Pixel Phone Ever Made—Here Are the Best to Buy Right Now


Portrait Light: You can change up the lighting in your portrait selfies after you take them by opening them up in Google Photos, tapping the Edit button, and heading to Actions > Portrait Light. This adds an artificial light you can place anywhere in the photo to brighten up your face and erase that 5 o’clock shadow. Use the slider at the bottom to tweak the strength of the light. It also works on older Portrait mode photos you may have captured. It works only on faces.

Health and Accessibility Features

Cough & Snore Detection (Tensor G2 and newer): On the Pixel 7 and newer, you can have your Pixel detect if you cough and snore when sleeping, provided you place your Pixel near your bed before you nod off. This will work only if you use Google’s Bedtime mode function, which you can turn on by heading to Settings > Digital Wellbeing & Parental Controls > Bedtime Mode.

Guided Frame (Tensor G2 and newer): For blind or low-vision people, the camera app can now help take a selfie with audio cues (it works with the front and rear cameras). You’ll need to enable TalkBack for this to work (Settings > Accessibility > TalkBack). Then open the camera app. It will automatically help you frame the shot.

Simple View: This mode makes the font size bigger, along with other elements on the screen, like widgets and quick-settings tiles. It also increases touch sensitivity, all of which hopefully makes it easier to see and use the screen. You can enable it by heading to Settings > Accessibility > Simple View.

Safety and Security Features

Theft Protection: This is a broader Android 15 feature, but essentially, Google’s algorithms can figure out if someone snatches your Pixel out of your hands. If they’re trying to get away, the device automatically locks. Additionally, with another device, you can use Remote Lock to lock your stolen Pixel with your phone number and a security answer. To toggle these features on, go to Settings > Security & privacy > Device unlock > Theft protection.

Identity Check: If your Pixel detects you’re in a new location, Identity Check will require your fingerprint or face authentication before you can make any changes to sensitive settings, offering extra peace of mind in case you lose your phone or if it’s stolen. You can enable this in Settings > Security & privacy > Device unlock > Theft protection > Identity Check.

Courtesy of Google

Private Space: Another Android 15 addition, Pixel phones finally have a feature that lets you hide and lock select apps. You can use a separate Google account, set a lock, and install any app to hide away. To set it all up, head to Settings > Security & privacy > Private space.

Satellite eSOS (Pixel 9 and Pixel 10 series, excluding Pixel 9a): Like Apple’s SOS feature on iPhones, you can now reach emergency contacts or emergency services even when you don’t have cell service or Wi-Fi connectivity. It’s not just available in the continental US, but also in Hawaii, Alaska, Canada, and even Europe.



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