Electron micrographs of Li-inserted MoS2 by the n-butyllithium method. (a) After 10 min, defects are created near the edges and in the steps of the specimen denoted by arrows. (b) After 2 h intercalation, superlattice spots appear (denoted by the letter s), which are indexed as (1/201/20). Notice also the splitting of the main spots (denoted by the letter m). (c) A micrograph taken from the same area reveals that the specimen is heavily defected owing to intercalation. (d) Distribution of lithium vs. distance from the edges of the specimen as revealed by SSNTD images. (e) Splitting of the () spots.