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What kills EV battery range? Real-time images pinpoint lithium metal weak spots

While it's true that, just like their petrol and diesel counterparts, electric vehicles may not always match their advertised range in day-to-day conditions, the great news is that there is plenty you can do to maximise your EV’s range. 

You’re not alone if you’ve wondered about how far your electric vehicle can really go. We’re here to clear up the myths and focus on the facts – and put the power back in your hands. By understanding the ins and outs of EV range, you’ll be set to boost your car’s performance and make the most of every charge.

Let’s take a look at the top factors that can influence the range of your EV, so you can hit the road worry-free.

A crucial clue to simultaneously increasing electric vehicle (EV) driving range and battery lifespan has been discovered. A research team at KAIST has observed the exact moment of degradation in lithium metal batteries at the nanoscale (approximately 1/100,000th the thickness of a human hair) and identified the fundamental cause of performance decline. This is evaluated as a significant turning point in accelerating the commercialization of next-generation batteries.

                1 / 1Overview of the EC-AFM measurement process. Credit: ACS Energy Letters (2026)

The research team, led by Professor Seungbum Hong from the Department of Materials Science and Engineering, identified the degradation mechanism of the lithium metal anode, a core component of next-generation batteries. The research is published in the journal ACS Energy Letters.

Lithium metal is dubbed a "dream battery material" due to its significantly higher energy density compared to conventional batteries. However, the rapid decline in performance after repeated charge and discharge cycles has been the biggest obstacle to commercialization. In particular, when lithium is deposited or stripped irregularly, it can form "dead lithium"—lithium that is electrically disconnected—which leads to performance degradation and poses safety risks.

Height maps and surface slope maps during the first-third plating/stripping processes. Credit: ACS Energy Letters (2026

The research team utilized in situ electrochemical atomic force microscopy (EC-AFM), which allows for real-time observation of the battery interior, to track the entire process of lithium deposition (plating) and removal (stripping). As a result, they confirmed that the lithium reaction does not occur uniformly across the entire surface but occurs selectively at specific locations.

Specifically, in porous regions with rough surfaces, voids were easily formed when lithium was stripped away, leading to the creation of "dead lithium" that becomes electrically isolated. This phenomenon acts as a direct cause of the sudden decline in battery performance.

The significance of this study lies in experimentally identifying where and how lithium metal batteries are damaged. Furthermore, it proved that the "initial morphology," where lithium is first formed, is a key variable that determines the long-term lifespan of the battery.

Accordingly, it is expected that if the surface where lithium forms is controlled uniformly and precisely in the future, battery life and stability can be dramatically improved. This suggests a design direction that can simultaneously achieve increased EV driving range and the development of long-life batteries.

Professor Seungbum Hong stated, "This research is highly significant as it directly confirmed the cause of battery performance degradation at the nanoscale. It will serve as an important foundation for developing safer and longer-lasting next-generation batteries."

The biggest everyday drains on EV battery range are highway speeds, extreme temperatures (both hot and cold), and heavy climate control use. Unlike gas cars, EVs use significantly more power overcoming aerodynamic drag at high speeds and rely on battery energy to heat or cool the cabin.

Specific factors that reduce your driving range include:

-High speeds & aggressive driving: Aerodynamic drag increases exponentially with speed. Rapid acceleration and hard braking drain the battery far faster than smooth, steady driving.

-Extreme weather: Frigid winter temperatures (freezing or below) thicken battery fluids, reducing efficiency and capacity. Similarly, extreme summer heat can cause the car to use energy to cool the battery.

-Heating and air donditioning: Turning on the cabin heater or air conditioner creates an auxiliary load that diverts power from the drivetrain. The Department of Energy notes that range can drop by up to 32% in sub-zero temperatures.

-Heavy loads & inefficient tires: Extra weight, roof racks, and trailers reduce efficiency. Using winter tires, having low tire pressure, or incorrect wheel alignment also increases rolling resistance.

Poor charging habits (long-term degradation): Over time, consistently charging the battery to 100% or letting it drop to 0% accelerates natural battery degradation.

Provided by The Korea Advanced Institute of Science and Technology (KAIST)