The insight of micro-short circuits caused by electrochemo-mechanical stress crosstalk in all-solid-state Li metal batteries

Recently, Professor Yang Yong’s team investigated three cathode materials (sulfur, NCM811, and LiCoO₂) with varying volume changes and compared the short-circuit behavior when paired with the LMAs under identical conditions. Operando pressure measurements and cohesive zone model-based finite element analysis indicate that sulfur and NCM811 materials undergo opposite directions of volume changes compared to Li metal anodes during cycling. In this case, the resultant force caused by stress crosstalk between electrodes will lead to more severe damage to SSE grain boundaries. In contrast, LiCoO₂ material exhibits consistent volume change direction with the Li metal anode during cycling, resulting in relatively weak mechanical damage to SSEs. Finally, an active pressure control system is proposed to help alleviate stress crosstalk and enhance cycling life. This study offers new insights into the stress crosstalk between electrodes in full cells, which is essential for developing high-performance ASSLMBs. The research, titled “The insight of micro-short circuits caused by electrochemo-mechanical stress crosstalk in all-solid-state Li metal batteries,” has been published in the Energy Storage Materials journal. The first authors are Gu Jiabao and Chen Xiaoxuan.