CATL is exploring an air-breathing battery. Could it give EVs 2,000 km of range?
By Google News Motors ·
A report by Chinese technology outlet IT Home has revived claims that lithium-air batteries could deliver electric vehicle ranges of up to 2,000 km and achieve five times the energy density of solid-state batteries. The chemistry’s theoretical specific energy is often cited at around 3,505 Wh/kg. However, this figure describes electrochemical potential, not the performance of a complete automotive battery.
The CATL connection comes from Chief Scientist Wu Kai, who identified lithium-air technology as a long-term research direction at the 2026 Equipment Powerhouse Forum. As we previously reported, CATL’s broader battery roadmap places sodium-ion and all-solid-state technologies closer to commercialisation, while lithium-air remains a longer-term research prospect.
CATL has not announced a 2,000 km production-car target or a commercial launch schedule for the technology.
The gap between theoretical energy density and automotive performance remains substantial. Oxygen management, chemical stability, rechargeability and the supporting equipment all present significant engineering challenges.
Conventional lithium-ion batteries store lithium within two electrodes, with lithium ions moving between the anode and cathode during charging and discharging. Lithium-air batteries instead use metallic lithium as the negative electrode and oxygen from the surrounding environment as the positive reactant.
During discharge, lithium reacts with oxygen to form lithium peroxide (Li₂O₂) inside a porous cathode. Charging reverses the reaction, releasing oxygen and returning lithium ions to the anode. Drawing oxygen from outside the cell rather than storing the positive reactant in a conventional cathode material gives the chemistry high theoretical specific energy.
The frequently cited 3,505 Wh/kg figure relates to the theoretical lithium-peroxide reaction and includes the oxygen reactant mass. Higher figures approaching 12,000 Wh/kg use a different calculation boundary that excludes oxygen mass. Neither represents the energy density of a complete automotive battery. Electrolytes, electrodes, protective components and air-management equipment all add weight and volume.
Automotive interest in lithium-air batteries predates CATL’s research. IBM launched its Battery 500 project in 2009, targeting a metal-air battery capable of powering an electric car for 500 miles (805 km) on a charge. The multinational research programme involved academic and industry partners but did not produce a commercially available automotive battery.
More recent research has addressed lithium-air batteries’ chemical limitations, particularly the accumulation of discharge products inside porous cathodes. A 2025 study by researchers at the University of Science and Technology of China, including Professor Peng Tan, examined how electrolyte oxygen-transport properties influence reaction mechanisms in lithium-oxygen batteries.
Using thick electrodes, the researchers showed how mass-transfer resistance can change reaction pathways at different positions within an electrode. The work provides insight into electrode design but does not establish an automotive solution to cathode blockage.
A separate result came from researchers associated with Jilin University and the Chinese Academy of Sciences. A 2024 study published in Advanced Energy Materials reported an optimised lithium-air pouch-cell configuration achieving 757.5 Wh/kg with an in-situ gelled polymer electrolyte. The…
Originally published by Google News Motors
