The key challenge of all-solid-state lithium batteries has been overcome.

China National Nuclear Corporation's Institute of Nuclear Energy Science and Technology recently collaborated with the Graduate School at Tsinghua University in Shenzhen. With the support of China's advanced research reactor and using neutron depth profiling analysis technology, they accurately revealed the key defects of traditional single-layer cathodes in all-solid-state lithium batteries. This research, for the first time, experimentally observed and quantitatively confirmed significant longitudinal lithium concentration gradients, achieving uniform distribution of lithium concentration in the electrode thickness direction. This provides strong experimental evidence for the core design of gradient electrodes and is of great significance in advancing the fundamental scientific understanding and engineering applications of all-solid-state lithium batteries. The related research results were published in the international academic journal "Energy and Environmental Science."