CATL Explores Lithium-Air Batteries as 2,000 Km EV Range Remains a Research Goal

A longer range starts with a difficult chemistry problem

CATL is exploring lithium-air batteries with a theoretical specific energy of about 3,505 watt-hours per kilogram, a figure behind projections of electric cars travelling 2,000 kilometres on one charge. Chief scientist Wu Kai identified the technology as a future research direction at the 2026 Equipment Powerhouse Forum in Beijing. The immediate task is making the chemistry rechargeable, durable and practical enough for a vehicle.

Contemporary Amperex Technology Co. Limited, the Chinese battery manufacturer known as CATL, has announced neither a production vehicle capable of that range nor a commercial launch date for lithium-air batteries. The 2,000 km figure is a projection based on the chemistry's potential to store large amounts of energy for its weight.

Wu's research roadmap places the technology more than a decade into the company's longer term work. Accounts of his remarks also credit CATL's laboratory programme with specific energy above 1,000 Wh/kg and a life of 500 charging and discharging cycles. Turning such laboratory progress into a complete battery requires equipment to control incoming air, protect reactive materials and keep performance stable through repeated use.

Research in China and the United States helps explain both the attraction and the difficulty. Scientists have demonstrated hundreds of cycles in some designs and at least 1,000 in another. They are also studying why solid reaction products obstruct electrodes and why oxygen struggles to reach the places where electricity is generated.

How a battery uses oxygen from the air

A conventional lithium-ion battery moves lithium ions between two electrodes containing materials that hold them. A lithium-air battery instead uses metallic lithium at the negative electrode and oxygen as a reactant at the positive electrode. An electrode is the part of a battery where an electricity producing or electricity storing reaction takes place.

In a common lithium-air design, lithium and oxygen react during discharge to form lithium peroxide inside a porous positive electrode. Electrons flow through the external circuit, supplying electricity. Charging is intended to reverse that process, breaking down the lithium peroxide, releasing oxygen and restoring lithium metal.

Oxygen arriving from outside the cell reduces the need to carry a conventional positive electrode material containing all the reactants from the start. That gives lithium-air chemistry its unusually high theoretical specific energy. The trade is that a battery drawing in air must also manage gases and moisture that a sealed conventional cell keeps outside.

Researchers are investigating several versions of this chemistry. Some use liquid electrolytes, the materials that carry ions between electrodes. Others use gels or solids. Their reaction products and operating conditions can differ, which matters when comparing their performance.

Why 3,505 and 12,000 Wh/kg both appear

The commonly cited 3,505 Wh/kg figure comes from the theoretical lithium-peroxide reaction and includes the mass of the oxygen reactant. Figures approaching 12,000 Wh/kg leave oxygen out of the mass calculation. The higher number therefore uses a different accounting boundary.

A complete battery adds electrolyte, electrode structures, separators, protective parts and equipment for controlling air. A vehicle battery also needs connections, a casing and temperature control. Each component adds weight or occupies space, lowering the energy stored per kilogram of the finished system.

For scale, conventional lithium-ion cells are commonly described in the research coverage at roughly 200 to 300 Wh/kg, with some advanced designs around 350 Wh/kg. Dividing 3,505 by 350 gives about ten. The practical challenge is retaining enough of the chemical advantage after building all the necessary hardware around it.

The claim that lithium-air offers five times the specific energy of solid-state batteries comes from comparing about 3,500 Wh/kg with a theoretical solid-state figure of 700 Wh/kg. A useful comparison for drivers would require complete batteries measured under comparable conditions, including usable capacity, power and durability.

What the laboratory results actually measure

Researchers associated with Jilin University and the Chinese Academy of Sciences reported a lithium-air pouch cell reaching 757.5 Wh/kg in a 2024 study published in Advanced Energy Materials. Their design used a polymer electrolyte formed into a gel inside the cell. They also demonstrated 241 laboratory cycles under specified conditions of 500 milliamperes per gram and a capacity limit of 1,000 milliampere-hours per gram.

Those operating conditions matter because a cycle can use only part of a cell's potential capacity. A cycle count becomes more useful when readers also know how deeply the cell was discharged, how quickly it operated and how much capacity it retained.

Illinois Institute of Technology and Argonne National Laboratory researchers described another approach in Science in 2023. Their solid-state lithium-air design completed at least 1,000 cycles at room temperature. It used a reaction forming lithium oxide rather than the lithium peroxide found in the more familiar design.

Some descriptions place an Argonne and Illinois Tech result in 2025 and present 1,200 Wh/kg as achieved prototype performance. The 2023 Science study described that figure as theoretical potential. Its demonstrated result was the cycling performance of the experimental architecture.

CATL's reported laboratory figures, the pouch cell result and the American solid-state experiment therefore answer different questions. Together, they show researchers pursuing lighter storage while working on the separate problem of keeping a battery functioning through repeated charging.

A research timeline stretching back to 2009

Automotive interest in lithium-air batteries long predates CATL's latest remarks. The research history includes ambitious vehicle targets, experiments with solid electrolytes and detailed investigations of reactions inside electrodes.

• 2009: IBM launched its Battery 500 project, aiming for an electric vehicle battery capable of 500 miles, about 805 km, per charge.
• 2023: Illinois Tech and Argonne researchers published their solid-state lithium-air study in Science, reporting at least 1,000 cycles at room temperature.
• 2024: A study in Advanced Energy Materials reported a lithium-air pouch cell at 757.5 Wh/kg and 241 cycles under specified laboratory conditions.
• 2025: University of Science and Technology of China researchers examined oxygen transport and reaction pathways in thick electrodes.
• 2026: Wu identified lithium-air batteries as a long term direction for CATL at the Equipment Powerhouse Forum.

IBM's programme did not lead to a commercially available automotive battery. The subsequent studies have concentrated on particular obstacles within the chemistry, including electrolyte stability, oxygen delivery and the formation of solid reaction products.

The air supply becomes part of the battery

Outside air contains water vapour and carbon dioxide as well as oxygen. Moisture can react with lithium metal, while carbon dioxide can produce lithium carbonate. Unwanted reactions consume useful materials and leave deposits that reduce performance.

A practical lithium-air system would therefore need controlled air intake, filtration and humidity management. Depending on its design, it could also require pumps, fans or other equipment to move gases through the battery. Those components take up room and consume some of the electricity the battery produces.

A 2023 study in the Journal of Energy Storage estimated that supporting equipment would consume 5.4% of battery power in its proposed vehicle configuration. At a battery output of 100 units of power, that would mean 5.4 units serving the supporting system. The estimate applies to that proposed design; other arrangements would have different requirements.

Inside the positive electrode, lithium peroxide can gradually fill pores needed for oxygen to move through. The process resembles a porous sponge filling with solid material: less open space means fewer routes for oxygen and less room for further reaction products.

Professor Peng Tan and colleagues at the University of Science and Technology of China have studied how oxygen transport affects reactions within thick electrodes. Their 2025 work examined how resistance to material movement changes reaction pathways at different positions. Related work described in the research coverage investigated how adjusting lithium-ion concentration can improve discharge capacity by changing where lithium peroxide forms.

Recharging must restore the chemistry repeatedly

Charging requires the battery to remove discharge products from the positive electrode and rebuild the lithium negative electrode. Side reactions can damage the electrolyte and other components, gradually reducing how much energy the cell can store.

Lithium metal presents another difficulty. Repeated deposition during charging can form uneven structures, including needlelike growths called dendrites. If these grow through the separator between electrodes, they can cause a short circuit. Researchers must control that process while maintaining useful charging speeds and capacity.

Energy efficiency also affects daily use. Round-trip efficiency means the share of electricity put into a battery that can later be recovered. Some lithium-air designs have been described as operating below 70%, compared with above 95% for lithium-ion batteries. Those figures vary with design and conditions, but they explain why storing more energy per kilogram is only part of the engineering task.

At 70% efficiency, recovering 70 units of electrical energy requires an input of 100 units. Energy lost during charging and discharging can become heat, adding to cooling needs and electricity consumption. Improving reversibility would therefore help durability, charging costs and temperature control at the same time.

What a 2,000 km car would need

A vehicle's range depends on usable battery energy and the electricity it consumes per kilometre. Battery weight matters, but so do vehicle size, speed, aerodynamics, temperature and the power used by cooling, heating and air management.

Specific energy describes storage per kilogram. Volumetric energy density describes storage within a given space. Power describes how quickly the battery can supply electricity. A passenger car needs enough of all three to fit its battery enclosure, travel a useful distance and provide acceleration or sustained driving power.

A lithium-air cell could offer an advantage in weight while requiring extra space for gas channels and treatment equipment. Engineers must also keep oxygen flowing when electricity demand rises. A range projection therefore needs a defined vehicle, a complete battery design and a driving test before buyers can judge it against existing cars.

Battery swapping would change how packs are charged, serviced and moved between vehicles. Restoring capacity lost to electrolyte breakdown or irreversible deposits would still require solving the underlying chemistry. A fleet of exchangeable packs would face those same durability costs.

Where CATL places the technology

CATL's nearer priorities are sodium-ion batteries and all-solid-state batteries. Accounts of Wu's 2026 remarks point to large scale sodium-ion production during 2026 and possible small production runs of solid-state batteries in 2027, while placing lithium-air research on a horizon beyond ten years.

Solid-state and lithium-air describe different aspects of a battery. Solid-state refers to the electrolyte. Lithium-air refers to the reaction involving lithium and oxygen. Researchers can combine the two, as the Argonne and Illinois Tech experiment did with a composite solid electrolyte containing lithium based nanoparticles in a polymer.

Heavy vehicles and storage for solar and wind electricity have also been identified as possible applications. Each would need a different balance of weight, space, efficiency, cost and operating life. Small applications in specialised settings could arrive earlier than mass adoption in passenger cars, although estimates of five to ten years remain forecasts.

For drivers, the concrete development is a major battery producer directing long term research toward a chemistry with substantial potential to reduce storage weight. The work now centres on making oxygen delivery, charging efficiency and material stability function together in a complete system.

Key Points

• CATL chief scientist Wu Kai identified lithium-air batteries as a long term research direction at a Beijing forum in 2026.
• The projected 2,000 km range comes from energy storage potential rather than a production vehicle test.
• The theoretical figures of 3,505 and nearly 12,000 Wh/kg use different assumptions about whether oxygen mass is counted.
• Laboratory studies have demonstrated progress in specific energy and cycling, using different designs and test conditions.
• Air filtration, electrode deposits, lithium stability and energy losses remain major engineering challenges.
• CATL has announced no commercial launch date for a lithium-air vehicle battery.