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，我们利用电子束在先进扫描电子显微镜（STEM）上实现了五种碱金属在单层二硫化钼上的原位掺杂。此外，我们还利用先进的EELS系统获得了不同相MoS2的电子结构指纹图谱。这些谱包括激子谱、Mo- l边谱（代表Mo的价态）和S-L边谱。其次，我们的研究涉及到嵌入双层石墨烯（BLG）的氯化钼（起始材料：MoCl5）的结构。利用STEM技术，我们发现嵌入材料由MoCl3网络、MoCl2链和Mo5Cl10环组成。这些观察结果揭示了二维MoClx中显著的晶格畸变和频繁的结构转变，这在其他金属氯化物体系中尚未观察到。

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.