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In‐situ imaging of Li‐ion migration at interfaces in an all solid Li‐ion battery
Author(s) -
Takata Keiji,
Osaka Ryuma,
Matsushita Yuki,
Nakanishi Taiki
Publication year - 2020
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6839
Subject(s) - materials science , ion , electrolyte , spinel , substrate (aquarium) , analytical chemistry (journal) , chemistry , electrode , metallurgy , organic chemistry , oceanography , chromatography , geology
We investigated the migration of Li ions at an interface between a Li x Ti 5 O 12 (LTO) and a solid electrolyte in an all‐solid Li‐ion battery. The optical reflection of LTO changes with variations in the Li content because the band structures of LTO vary with the changes in the Li content. This enables us to observe Li‐ion migration in the interface between the LTO and the solid electrolyte using an optical microscope. To observe the LTO particles optically, they were coated on an indium tin oxide on a glass substrate. Variations in Li migration caused by charging/discharging were clearly observed through the changes in the reflection of the LTO. LTO changed between an insulator Li 4 Ti 5 O 12 of the spinel structure and a conductor Li 7 Ti 5 O 12 of the rock‐salt structure according to the changes in the Li content. The spinel LTO has a bandgap energy of approximately 2 eV. When electron–hole pairs were generated, electric strains were produced. Surface force microscopy detected the strains and imaged the distribution of lithiation/delithiation of LTO. Interfacial conduction between a sputtered LTO and Li 3 PO 4 particles was imaged with high spatial resolution.