WHY THIS MATTERS IN BRIEF
Petrol-density batteries would end range anxiety and make combustion cars obsolete, if lithium-air chemistry can finally be tamed.
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The batteries powering the electric cars and trucks, as well as airplanes and ships of the future, are in laboratories today. The internal combustion engine has been smoothed and polished into the docile, reliable power source we take for granted today, but it was not always so.
Early automobiles were snorting, cantankerous beasts that tended to shake themselves to pieces after a few thousand miles. That’s the reason so many manufacturers only offered a 12 month, 12,000 mile warranty — they knew the limitations of their products. Today, a quarter of a million miles of faithful service is not uncommon.
Now that CATL, the largest battery manufacturer in the world, has begun mass production of Sodium-Ion batteries, it is turning its attention to the batteries it will manufacture in the future. According to , Wu Kai, the chief scientist at CATL, told the 2026 Powering The Nation forum in China that the company’s long-term focus is on Lithium-Air battery technology.
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Why is that big news? Because the theoretical density of lithium-air batteries is 12,000 Wh/kg. That is roughly the same energy density as gasoline. Take a moment to ask yourself what having batteries that can hold has much energy per pound as gasoline would do to the Electric Vehicle (EV) revolution. Assuming they are not OMG expensive, they would obliterate conventional cars and trucks like ocean waves washing away a sandcastle.
Unlike traditional Lithium-Ion batteries, which rely on heavy metal compounds like nickel, cobalt, and manganese to store lithium ions, Lithium-Air batteries utilise lithium metal as the anode and oxygen from the air as the cathode reactant. This design significantly reduces weight and complexity, earning the new technology the nickname “breathable batteries.”
Current Lithium-Air prototype batteries have reached an energy density of more than 1,200 Wh/kg, which is four times as much as most batteries in commercial use today and significantly higher than the 500 Wh/kg expected from solid-state batteries. For the record, CATL is pursuing solid-state battery development as its middle range objective, with Lithium-Air on the far horizon.
So what’s the projected timeline for these wondrous batteries of the future that could power a car for a thousand miles or more on a single charge? has some insights on that question. It notes that the concept of lithium-air batteries dates back to the 1970s but practical applications have faced a number of hurdles. Sensitivity to moisture and carbon dioxide in the air, as well as issues with catalyst stability and cycle life, are the primary concerns.
However, recent breakthroughs have breathed new life into this nascent technology. In 2024, a joint research team from the University of Illinois Chicago, Argonne National Laboratory, and California State University, Northridge, successfully demonstrated a Lithium-Air battery capable of over 700 cycles in an air-like environment. Then, in 2025, Argonne National Laboratory and the Illinois Institute of Technology developed a prototype that achieved 1,200 Wh/kg with a 1,000 cycle lifespan at room temperature.
Early prototypes of Lithium-Air batteries had a limited lifespan because chemical reactions generated lithium super-oxide or lithium peroxide, compounds that restricted total energy efficiency. In 2025, the researchers were able to successfully create a four-electron chemical reaction pathway at room temperature. That advance allowed the prototype batteries to form and decompose lithium oxide, which expanded the available energy storage significantly.
To address safety and longevity, the researchers replaced flammable liquid electrolytes with a solid-state composite matrix made of ceramic-polyethylene oxide polymer infused with lithium-rich nanoparticles. The solid layer isolated the reactive processes, stopped leaks, and stabilised the cells during high-energy cycles.
If and when Lithium-Air batteries become available, it seems highly likely that it will be China that reaps the rewards.
Why are lithium-air batteries such a big deal?
Their theoretical energy density rivals petrol, so a single charge could last a thousand miles or more, but moisture sensitivity and short cycle life have kept them in the lab for decades.
