Intercalation mechanism of two dimensional battery materials studied by advanced TEMs

在过去的一年里，我们的研究主要集中在两个方向上。首先，我们利用先进的扫描电子显微镜(STEM)中的电子束实现了五种碱金属在单层MoS_2上的原位掺杂。此外，我们还利用先进的电子能谱系统获得了不同物相的MoS_2的电子结构指纹图谱。这些光谱包括激子光谱、Mo-L边(代表钼的价态)和S-L边光谱。其次，我们的研究包括对插入双层石墨烯的氯化钼(原料为MoCl5)的结构进行了研究。利用扫描电子显微镜，我们发现插层材料由MoCl3网络、MoCl2链和Mo5Cl10环组成。这些观察揭示了二维MoClx中显著的晶格扭曲和频繁的结构转变，这是在其他金属氯化物系统中没有观察到的。

In the past year, our research focused on two main directions. Firstly, we achieved in-situ doping of five types of alkali metals on monolayer MoS2 using an electron beam in an advanced scanning electron microscope (STEM). Additionally, we obtained electronic structure fingerprint spectra of MoS2 with different phases using an advanced EELS system. These spectra included exciton spectra, Mo-L edge (representing the valence state of Mo), and S-L edge spectra.Secondly, our research involved studying the structure of molybdenum chlorides (starting material: MoCl5) intercalated into bilayer graphene (BLG). Using STEM, we discovered that the intercalated material consists of MoCl3 networks, MoCl2 chains, and Mo5Cl10 rings. These observations revealed significant lattice distortions and frequent structural transitions in the 2D MoClx, which have not been observed in other metal chloride systems.