Mamoru Senna

Faculty of Science and Technology, Keio University

During charging and discharging of lithium ion battery (LIB), Li-ions are always forced to move downwards or upwards as quickly as possible. This is particularly important, when we are dealing with all-solid LIB. For one of the most promising solid state electrolytes, garnet type cubic Li7La3Zr2O12 (c-LLZO), efforts were paid to increase their ionic conductivity, mainly by replacing some of the cationic species, instead of improving their solid state preparative processes (SSPP). Similar is true for anode materials, e.g. spinel Li4Ti5O12 (LTO). SSPP will improve the Li-ion traffic throughout LIB.

The present talk starts with solid state processes for c-LLZO and LTO at lowest possible temperature to suppress their grain growth. Their electrochemical behaviors in conjunction with their overall Li-ion battery properties are then discussed. Emphasis is laid on the relationship between the chemical and structural states of c-LLZO and LTO and their overall electrochemical performances in some prototypic LIB.