A lithium-ion battery experiment has been completed aboard China’s Tiangong space station, focusing on fundamental electrochemical processes that determine performance and longevity. Researchers from the Dalian Institute of Chemical Physics under the Chinese Academy of Sciences reported the work, which was carried out by the three astronauts of the Shenzhou XXI crew.
The experiment aims to clarify how internal battery processes behave when gravity is removed from the system. According to the institute, the goal is to separate the effects of gravity from electric fields in the cells so that their individual roles in shaping battery behavior can be identified.
Lithium-ion batteries are widely used in spacecraft because they provide high energy density and stable operation. The institute noted that on Earth it remains difficult to determine how active species and other chemicals are distributed in the electrolyte, even though this distribution has a strong influence on the power and cycle life.
“The fundamental challenge on the ground lies in gravity,” the institute said. “Gravity is constantly intertwined with electric fields, making it difficult to isolate gravity’s influence on internal battery processes.”
In orbit, the microgravity conditions at Tiangong provide an environment in which battery operation can be observed without the normal influence of weight-driven currents. The research team expects that this environment will reveal how electrochemical and transport phenomena respond when gravitational effects are minimized.
According to the institute, understanding these mechanisms in microgravity will help solve current limits in models coupling gravitational and electric fields in batteries. The findings are expected to support improvements to power systems already deployed in space and guide the development of safer, higher energy density batteries for future missions.
