High Power and Safe Li-metal Batteries Part Ⅰ: The Mechanism of Li Metal Growth in Porous Structures

摘要

Dendrite growth should mechanically suppressed by the rigidity of solid electrolytes. Solid Polymer Electrolytes - Dendrite preventionBut at T > 80 °C (operating T of SPE cells) elastic stiffness of polymeric electrolytesdecreases=> Dendrite growth possible. Additions of inorganic oxides (AI_2O_3, SiO_2) increase stiffness.Solid Inorganic Electrolytes - Dendrite prevention more likely caused by a high shearmoduleBut dendrite growth is observed as well, e.g. at Iow material density (high porosity), large grain boundaries, Iow shear modulus, Iow fracture toughness, and surfaces with defects.