Electrochemical reactions in an all-solid-state Li-ion battery observed by ex situ and in situ spatially-resolved TEM EELS
Microscopy and Microanalysis
All-solid-state lithium-ion batteries (LIBs) with incombustible solid electrolytes have advantages of safety, reliability, lifetime, cost, and energy density. However, a serious problem is the large interfacial resistance of Li-ion transfer at the electrode/solid-electrolyte interfaces. One effective solution is an in situ formation of electrode active materials from parent solid electrolytes. Because the electrodes grow from the solid electrolytes with Li insertion reaction, both materials
... both materials become connected to each other at an atomic scale, leading to a low interfacial resistance. Such electrodes were discovered in Li 2 O-Al 2 O 3 -TiO 2 -P 2 O 5 -based solid electrolytes (LATP) . However, the electrochemical reactions, such as the structural growth mechanism and electronic structure changes, are still unclear. Here, we used ex situ and in situ spatially resolved TEM EELS (SR-TEM-EELS) to directly observe the nano-scale Li profiles and the influence on other elements, Ti and O .