The Lithium-Ion Battery Is Overdue for Retirement. An MIT Professor Explains What Comes Next.

Batteries are everywhere. They power the devices in your pocket, the laptop on your desk, and increasingly, the vehicle in your driveway. But while the products running on batteries have evolved dramatically over the past two decades, the battery itself has remained surprisingly static.

The lithium-ion battery has been the dominant technology for decades. And according to Donald Sadoway, Professor Emeritus at MIT and a co-founder of numerous battery companies, that's a problem the industry can no longer afford to ignore.

What's Wrong with Lithium-Ion

The lithium-ion battery works. That much is not in dispute. But "works" is not the same as "optimal," and for the demands being placed on EV batteries in particular, lithium-ion has real and meaningful limitations.

It's heavy. Battery weight is a significant factor in EV range calculations. Heavier batteries mean more energy required to move the vehicle, which reduces efficiency and drives up cost.

It's expensive. The materials and manufacturing processes involved in lithium-ion production contribute to high per-kWh costs that still represent one of the largest components of an EV's sticker price.

It depends on a limited resource. Lithium is a finite material with a geographically concentrated supply chain. As EV demand scales to hundreds of millions of vehicles globally, the strain on lithium supply becomes a structural constraint on the entire transition.

It raises safety concerns. Lithium-ion batteries can experience thermal runaway under certain conditions, which is a primary driver of EV fire incidents and imposes engineering constraints on battery pack design.

None of these are insurmountable problems. But they collectively represent a ceiling on what lithium-ion can accomplish as the foundation of mass-market electrification.

What Sadoway Is Building Instead

Sadoway's career has been defined by a simple but radical framing: design batteries using earth-abundant materials, at low cost, at high performance. His work has produced technologies that challenge the assumption that the lithium-ion battery is the end of the story rather than an early chapter.

His most prominent breakthrough is the liquid metal battery, which uses low-cost, widely available materials and operates at high temperatures to deliver a fundamentally different approach to energy storage. Rather than the solid electrodes and liquid electrolyte of lithium-ion, liquid metal batteries use all-liquid internal components that self-segregate by density, eliminating the degradation mechanisms that limit conventional battery lifespan.

The implications for grid-scale storage are significant. For EV applications, the work is part of a broader landscape of next-generation battery research that Sadoway has spent decades advancing.

The Road to Affordable EVs Runs Through Better Batteries

Sadoway's argument is ultimately an economic one as much as a technical one. The path to truly mass-market EV adoption depends on getting vehicle costs down to a level where the decision to go electric is financially obvious, not just environmentally motivated.

Battery cost is the single largest lever available. And while lithium-ion costs have fallen substantially over the past decade, the trajectory has limits. The fundamental materials constraints of the technology create a floor below which costs cannot fall without changing the chemistry.

New battery technologies, designed around abundant materials with simpler manufacturing processes, have the potential to push through that floor. That's the bet Sadoway and other battery researchers are making, and it's one the EV industry needs to pay attention to.

What "Science in Service of Society" Actually Means

Sadoway describes himself as "a firm believer in science in service of society." That phrase is more than a tagline. It reflects a deliberate orientation in his research: the measure of a breakthrough isn't whether it's technically elegant, but whether it can be manufactured at scale and deployed at a cost that serves real people.

That constraint shapes his research priorities. A battery technology that requires exotic materials or complex manufacturing is interesting. A battery technology that can be built cheaply, from materials available everywhere, at a scale that can actually power the global vehicle fleet, is transformative.

The distinction matters enormously for the EV transition. The industry doesn't need batteries that are marginally better than lithium-ion. It needs batteries that are categorically more affordable, more accessible, and more sustainable.

The Bottom Line

The EV industry's long-term success depends on a technology that doesn't yet dominate the market: the post-lithium battery. Researchers like Sadoway are building the foundation for what that looks like.

The timeline for commercial deployment at scale is a matter of ongoing research and manufacturing development. But the direction is clear, and the urgency is real.

Listen to the full episode of the Driving Mobility podcast to hear Donald Sadoway explain the science behind next-generation batteries, the specific limitations of lithium-ion technology, and his vision for what affordable, scalable energy storage looks like.

Driving Mobility is ParkMyFleet's podcast covering the trends, technologies, and leaders shaping the future of mobility.