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Tesla 1 million-mile battery in sight with new electrolyte solvent patent

(Credit: Tesla)

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A newly published patent from Tesla aims to bring the company’s idea for a one-million mile battery to life by using numerous electrolyte additives to increase the longevity and performance of its lithium-ion cells.

Tesla submitted the patent for “Dioxazolones and Nitrile Sulfites as Electrolyte Additives for Lithium-Ion Batteries” in August 2018. The patent is focused on improving the company’s rechargeable battery systems by adjusting the cells’ chemistry.

The patent claims that the addition of electrolyte additives, like lithium salt, can drastically improve the longevity and performance of battery systems when combined with a nonaqueous solution. A nonaqueous solution does not include water as the solvent, but rather another liquid.

The patent states:

Electrolyte additives have been shown to be operative and increase the lifetime and performance of Li-ion-based batteries… To further progress the adoption of electric vehicles and grid energy storage applications, it is desirable to develop lithium-ion cell chemistries that offer longer lifetimes at high temperatures and high cell voltages, without significantly increasing cost. The introduction of sacrificial electrolyte additives on the order of a few weight percent is a practical method to form protective solid-electrolyte interphase (SEI) layers that limit electrolyte decomposition during cell storage and operation. In recent years, significant efforts have yielded a large number of such additives that may be used to improve cell performance for various applications. Examples are vinylene carbonate (VC), fluoroethylene carbonate (FEC), prop-l-ene-l,3-sultone (PES), ethylene sulfate (1, 3, 2-dioxathiolane-2, 2-dioxide, DTD), and lithium difluorophosphate (LFO)

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Tesla recognizes that increased temperatures are detrimental to the lifespan of a battery system. In a previous patent, Tesla outlined a cooling system that could lead to longer-lasting energy storage systems. While heat is unavoidable as it is a key player in the use of lithium-ion batteries, especially when owners of Tesla vehicles are operating in performance modes, engineers realize the solvents and solutions could be a way to improve performance and lifespan without significantly increasing cost.

In a way, a good part of Tesla’s lead in the electric car industry lies in the company’s batteries, or more specifically, its cell chemistry. It is these factors that allow Tesla to maximize its vehicles’ battery packs, and a key reason why the Model S Long Range is able to travel 373 miles on one charge with a 100 kWh battery, and why the Porsche Taycan can only go 201 miles per charge on a pack that’s nearly as large. This patent confirms that Tesla continues to work on improving its batteries, allowing the company to maintain or even increase its lead in the EV segment.

At Tesla’s Autonomy Day in April 2019, Elon Musk promised owners that the company would soon power its vehicles for upwards of one million miles over the span of the vehicle’s life. While the claim seemed enthusiastic and somewhat unrealistic, critics soon realized Tesla may be closer to this than many think. In September, a team of researchers led by Jeff Dahn at Dalhousie University published a research paper that claimed they had developed a lithium-ion battery capable of one million miles of driving, or 20 years of use in an energy-storage system.

Tesla’s battery technology continues to advance thanks to developments from its engineers. It appears Tesla is aiming to create a line of products that will last decades. In terms of automobiles, it would be groundbreaking to have a car that could run for 20 or 30 years with relatively no annual maintenance. Convenience, performance, and longevity are three things Tesla’s products are aimed toward, and the patent for an advanced and more affordable battery system thanks to an electrolyte solvent could alleviate any concerns some owners may have.

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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 confirms massive hardware change for autonomy improvement

Tesla has confirmed that a recent change made to some of its recently refreshed vehicles is, in fact, a strategy it will use to improve its suite as it continues to work toward autonomy.

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Credit: Tesla

Tesla has confirmed that a recent change made to some of its recently refreshed vehicles is, in fact, a strategy it will use to improve its suite as it continues to work toward autonomy.

Tesla first introduced a front-facing camera on the front bumper with the Cybertruck and new Model 3 “Highland” over the past couple of years.

Then, the Model Y “Juniper” received the hardware update. The Model S and Model X both received the front-facing camera with its latest update, which was officially revealed last week.

Tesla used new language with the release of the front-facing cameras on the Model S and Model X, confirming they will assist with several things, including “using Autopilot and Actually Smart Summon capabilities”:

“Enhanced visibility when parking or using Autopilot and Actually Smart Summon capabilities.”

This tiny feature on the new Tesla Model Y is perhaps its biggest addition

This is the first time Tesla has used this sort of language, as it was a completely different description with the launch of the new Model Y in January.

When Tesla launched this vehicle, it said the front bumper camera “provides a wider field of view for automatic assisted driving and advanced Smart Summon.”

Tesla switched from using cameras and sensors to only cameras with the launch of Tesla Vision several years ago. The company’s utilization of cameras comes from Tesla’s belief that Ultrasonic Sensors (USS) are not needed for self-driving efforts:

“Along with the removal of USS, we simultaneously launched our vision-based occupancy network – currently used in Full Self-Driving (FSD) (Supervised) – to replace the inputs generated by USS. With today’s software, this approach gives Autopilot high-definition spatial positioning, longer range visibility and the ability to identify and differentiate between objects. As with many Tesla features, our occupancy network will continue to improve rapidly over time.”

CEO Elon Musk has said that sensors were only a crutch and that self-driving would be solved through the use of cameras:

“When your vision works, it works better than the best human because it’s like having eight cameras, it’s like having eyes in the back of your head, beside your head, and has three eyes of different focal distances looking forward. This is — and processing it at a speed that is superhuman. There’s no question in my mind that with a pure vision solution, we can make a car that is dramatically safer than the average person.”

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Tesla features used to flunk 16-year-old’s driver license test

A license examiner in New Jersey confused one standard feature of Teslas as a way a 16-year-old excelled through his driver’s test. He failed him because of it.

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Credit: @JasemAsh via Tesla Owners Wisconsin/Twitter

In what is becoming a more common occurrence, a few Tesla features were used to flunk a 16-year-old who took his driver’s license test in New Jersey.

It is not the first time this has happened, as we have reported on several instances of this in the past, both in the U.S. and other countries in the world.

It is evidence that some officials are not caught up in the technology and innovation occurring in the automotive market, some of which is not necessarily exclusive to Tesla, but is included in each of its models, unlike other companies.

Lochlan Keefer, a New Jersey resident, showed up to his driver’s test with his dad, James, in their 2022 Tesla Model Y. However, the test did not go according to plan, according to the examiner who rode along for the test with Lochlan. They accused him of using parking and “stopping assistance” to go through the test.

The examiner cited the following as the reason for failure:

“Had the parking and stopping assistance on never stepped on the brake to stop his self let the vehicle stop it self.”

James said to NJ.com that they do not subscribe to Tesla’s Full Self-Driving suite, which includes things like Autopark, Navigate on Autopilot, and Autosteer on City Streets. These are a few of the things that have been used as reasoning to fail drivers in tests. Lochlan’s was a case of regenerative braking, which is standard on all vehicles, and Autopark:

“The examiner accused my son of using driver assistance features simply because he parallel parked smoothly on the first try. He was specifically accused of using paid parking-assist and driving features, which we do not subscribe to.”

It sounds as if the examiner may have confused the braking mishap for Tesla’s regenerative braking, which slows the vehicle when the accelerator is not pressed. The energy is then stored back in the battery to help with range.

The examiner failed Lochlan, and James asked if he could take the test again if they disabled the regenerative braking for the exam. The examiner said Lochlan would have to wait two weeks. A supervisor came out and backed the examiner, but James said the policy the DMV claimed the Keefer’s violated was nowhere to be found:

“I asked them to show me the policy they claimed we were violating. They couldn’t find it and they couldn’t cite it. When I showed them the policy, they refused to read it.”

The report states that drivers in California and Arizona have also been subjected to failures on their driving tests due to confusion over Teslas and their driver assistance features.

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Tesla Robotaxi just got a big benefit from the U.S. government

The NHTSA is looking to help streamline the application process for companies developing driverless vehicles.

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Credit: Tesla

Tesla Robotaxi just got a big benefit from the U.S. Government, as the National Highway Traffic Safety Administration (NHTSA) is looking to ease some rules and streamline the application process that could hinder the development and licensing of autonomous vehicles.

Tesla is set to launch its Robotaxi platform in the coming days or weeks, but regulation on autonomous vehicles is incredibly slim, so automakers are left in a strange limbo as permissions to operate are usually up to local jurisdictions.

The NHTSA still has the ultimate say, but it is now adopting a new strategy that will see companies gain an exemption from federal safety standards and streamline the entire application process.

The agency is authorized to grant exemptions to permit manufacturers to produce vehicles over a two or three-year period that might not comply with certain Federal Motor Vehicle Safety Standards (FMVSS). Robotaxi, for example, will eventually not have a steering wheel or pedals, through the Cybercab that Tesla unveiled last October.

The exemption program the NHTSA announced today would be possible through Part 555 of the National Traffic and Motor Vehicle Safety Act:

“NHTSA may grant a Part 555 exemption if at least one of four bases listed in the statute is met and NHTSA determines that the exemption is consistent with the public interest and the Safety Act. The statute also authorizes NHTSA to subject an exemption to terms the agency deems appropriate and requires that NHTSA publish notice of the application and provide an opportunity to comment.”

The rapid and non-stop innovation that is being performed is tough to keep up with from a legal standpoint. The NHTSA recognizes this and says current legislation is appropriate for traditional vehicles, but not for the self-driving cars companies are producing now:

“The current Part 555 process was designed for traditional vehicles. As currently applied, this process is not well suited for processing exemptions involving ADS-equipped vehicles in a timely manner or overseeing the unique complexities involving their operations. This has resulted in long processing times for applications for ADS-equipped vehicles. NHTSA must improve its Part 555 processing times substantially to keep pace with the rapid innovation of the ADS industry and to ensure that exemptions remain effective tools for nurturing groundbreaking safety technologies.”

Now, the NHTSA will be “enhancing application instructions” to help manufacturers understand the requirements involved in the application process. This will streamline the entire process by “reducing the need for NHTSA to request additional information from the manufacturer,” the agency says.

First Tesla driverless robotaxi spotted in the wild in Austin, TX

Next, the NHTSA is going to have a more flexible approach to evaluating exemptions for ADS-equipped vehicles:

“To build flexibility into the Part 555 process while also accounting for the unique aspects of those exemptions, NHTSA intends to develop terms that could be included in Part 555 exemption grants, when appropriate, to condition operations of exempted ADS-equipped vehicles on enhanced and continuing oversight from NHTSA. NHTSA would expect to administer this enhanced oversight through letters, which could be updated over time, mirroring real-world ADS development. This will enable NHTSA to focus its initial review during the application stage and align the Part 555 oversight approach more closely to exemptions administered under NHTSA’s Automated Vehicle Exemption Program (AVEP), which have proven effective for ADS.”

This will benefit any company making autonomous vehicles, but it will especially benefit Tesla in the short-term as it is readying for the launch of Robotaxi.

Tesla is trading up 1.89 percent at the time of publication.

Part 555 Letter June 2025 by Joey Klender on Scribd

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