Use of PicoFemto®In situ sample rod published research results continue to update, the future small series will continue to update product application cases. Teachers who missed the previous report can also click "previous articles" on the front page of the public number to read. You are also welcome to pay attention to the public number. Here are the cutting-edge information in the field of electron microscopy, special experimental schemes and high-level research results. Come and open your brains with your friends. This issue of

brings an application case of PicoFemto in-situ sample rod in the field of electrochemistry. For lithium-ion batteries, the charge-discharge efficiency and energy efficiency are mainly determined by the transport mechanism and phase transition path of lithium ions in the electrode material. Therefore, understanding the insertion and extraction of lithium ions in situ and on the atomic scale is very important for understanding the working mechanism and failure mechanism of lithium batteries. In this paper, the charging and discharging process of SnS2 was observed in situ by using high resolution TEM combined with scanning probe in situ sample stage. Studies have shown that the charging process of lithium-ion batteries is a two-phase reaction that occurs rapidly. After energization, SnS2 and Li ions rapidly form LiSnS2. However, during discharge, an intermediate phase structure of Li0.5SnS2 is produced. This mesophase structure is distributed in the cell with sizes ranging from 1-4 nm. The discovery of this asymmetric reaction path is of great significance to the understanding of the charge and discharge process of layered electrode materials, and also helps to understand the nature of voltage hysteresis in electrode materials. Relevant research results were jointly completed by Peking University, Quantum Matter Collaborative Innovation Center, Chengdu University of Electronic Science and Technology, Institute of Physics, Brookhaven National Laboratory, Wuhan University and Nebraska-Lincoln University, and published on Nano Letters (Nano Letters,2016,16(9): 5582-5588).

PicoFemto series in-situ sample rods of Zeryou Technology are used as the carrier of the battery model in this study, which stably and accurately completes the tasks of sample area selection and electric field application.

SnS2 sheet was fixed on the copper electrode and placed on one end of the in situ sample rod. Metal lithium (surface passivated) coated the W probe of the sample rod, contacted with SnS2 and formed a loop. The phase transition boundary can be clearly seen after applying a voltage to the sample. The implantation process of

Li is very rapid, and the LiSnS2 structure is directly formed. However, the extraction process of Li is accompanied by the production and disappearance of the Li0.5SnS2 intermediate phase. This mesophase structure tends to exist as a 1-4 nm nuclear structure.

diffraction map further confirms the existence of intermediate phase

theoretical calculation supports the experimental results