An investigation on strength distribution, subcritical crack growth and lifetime of the lithium-ion conductor Li7La3Zr2O12

摘要: Due to the good chemical stability regarding lithium and cathode materials under high voltage, Li7La3Zr2O12 (LLZO) is considered as a promising electrolyte in all-solid-state Li-ion batteries. However, enable stable long-term operation, knowledge of mechanical boundary conditions required. Since properties components cells depend on microstructure, micro- macro-mechanical LLZO were investigated systemically via indentation tests ring-on-ring bending (ROR) tests. Hence, fracture stress, elastic modulus, hardness toughness material characterized different applied loads. Additionally, room-temperature subcritical crack growth effects studied basis loading rate-dependent ROR test derived data order assess potential reliability issues application-relevant conditions. A strength–probability–lifetime plot these stress data. Complementary optical electron microscopic investigations carried out. The Weibull modulus 6, should not exceed 21 MPa for lifetime 3 years warrant failure probability 1%.