STEM characterization for lithium-ion battery cathode materials

► Anti-site defects in LiFePO4 observed by HAADF-STEM. ► Oxygen vacancy ordering in LiMn2O4 revealed by ADF technique. ► Degradation mechanism of LiNi0.8Co0.15Al0.05O2 revealed by STEM and EELS. ► Direct observation of Li and H with atomic resolution by ABF imaging. ► Future opinions on the research field of lithium ion battery by STEM.