China's space station completes lithium‑ion battery experiments for next‑generation power systems
China has successfully carried out a series of in‑orbit experiments on lithium‑ion batteries aboard its space station, aiming to advance the design of safer and more efficient power systems for future spacecraft. The project, officially titled "In‑situ Electrochemical Optical Research on Lithium‑ion Batteries for Space Applications," was jointly operated by the Shenzhou‑21 astronaut crew, with Chinese Academy of Sciences researcher Zhang Hongzhang serving as the payload expert.
Lithium‑ion batteries are widely used in modern space missions because of their high energy density, long cycle life, and strong reliability. However, ground‑based experiments are limited by Earth's gravity, which interferes with the electric field inside the battery and makes it difficult for scientists to isolate the effects of gravity on internal electrochemical processes. The microgravity environment in orbit removes this constraint, allowing researchers to observe ion transport, lithium embedding and release, and other key processes with far greater clarity.
Microgravity also introduces new challenges. Liquid behavior inside the battery changes significantly in space, which can reduce performance or increase safety risks. To address this, the experiment focused on real‑time optical observation of lithium‑ion cells, capturing the full growth process of lithium dendrites-structures that can compromise battery safety if left uncontrolled. The team also performed precision electrochemical adjustments, monitored experiment status live, and documented key scientific phenomena as they occurred.
Researchers expect the results to help break long‑standing scientific bottlenecks related to the interaction between gravitational and electric fields. The findings will support improvements to current in‑orbit battery systems and guide the development of next‑generation high‑energy, high‑safety batteries for future spacecraft.
The experiment is part of China's broader push to strengthen its space‑technology capabilities. The Chinese space station program is operated by the China Manned Space Agency (CMSA), which oversees spacecraft development, astronaut missions, and scientific payloads. CMSA has been expanding its research portfolio in recent years, focusing on materials science, life‑support systems, and advanced energy storage. The organization works closely with major Chinese research institutions, including the Chinese Academy of Sciences, to integrate scientific experiments into long‑duration missions and accelerate the development of technologies intended for deep‑space exploration.
