Effects of pressure, temperature, and plasticity on lithium dendrite growth in solid-state electrolytes.

The growth of lithium dendrite in solid electrolytes has become a major obstacle to the development of solid-state lithium batteries. Lithium dendrite can cause problems such as reduced Coulombic efficiency and shortened lifespan of the battery, and may even cause short circuits that lead to battery failure. The phase field method is used to establish a coupled electro-thermo-mechanical model to study the growth of lithium dendrite, and the plastic behavior of lithium dendrite is also considered. Based on the theory of heat transfer models, the influence of temperature changes on the morphology of lithium dendrite and von Mises stress are analyzed. Using the theory of plastic work, the influence of temperature changes and external pressure changes on the plastic strain of lithium dendrite are analyzed. The results show that the inhibition effect on lithium dendrite is more significant with increasing external pressure and temperature values, and von Mises stress also increases. Lithium dendrite may fracture due to excessive von Mises stress and form dead lithium. The equivalent plastic strain of lithium dendrite increases with the increase of temperature and external pressure values. [ABSTRACT FROM AUTHOR]