CATL Unveils Second-Generation Sodium-Ion Battery: Performs at -40°C, Set for Launch in 2025

At the World Youth Scientist Forum, Dr. Kai Wu, Chief Scientist at CATL, announced that the development of the second-generation sodium-ion battery has been completed. This new battery is capable of operating in extremely cold temperatures as low as -40°C, making it ideal for use in cold-climate regions. The battery is expected to be officially launched in 2025.

Sodium-ion batteries share a similar structure and working principle with lithium-ion batteries. Both consist of positive and negative electrodes, a separator, and an electrolyte, with energy being stored and released through the movement of ions between the electrodes. While sodium-ion batteries have a lower energy density compared to lithium-ion batteries, they excel in terms of safety and low-temperature performance, making them particularly suitable for harsh cold environments.

Back in 2021, CATL launched the first-generation sodium-ion battery, which gained significant market attention due to its high energy density (160 Wh/kg), fast charging capabilities (charging up to 80% in just 15 minutes), excellent low-temperature performance (over 90% discharge retention at -20°C), and strong thermal stability. The second-generation sodium-ion battery aims to achieve an energy density of 200 Wh/kg, further improving its performance.

Last year, CATL announced a collaboration with Chery to integrate sodium-ion batteries into Chery vehicles, and to launch the "ENER-Q" battery brand. This partnership will cover a wide range of battery types, including sodium-ion, lithium iron phosphate (LFP), AB, and M3P batteries. While sodium-ion batteries have a lower energy density compared to lithium-ion, they offer superior safety and better low-temperature performance.