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Australian university develops a new type of large capacity silicon negative material
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Recently, the Australian University of Wollongong Du Yi group by molecular beam epitaxy prepared Single-layer / multi-layer silicon oxide samples and microscope a detailed study of the atomic and electronic structures of silylenes with scanning tunneling.
Silicon is a kind of layered silicon material with honeycomb structure, which can be prepared by molecular beam epitaxy and solid phase reaction. Since the bond lengths between silicon atoms in graphene are much higher than the bonds between carbon atoms in graphene, the arrangement of the atoms in the middle of the graphene is arranged in a warped arrangement. Compared to the traditional silicon material with diamond structure, coupling effect of silylenes interlayer is a fan of Edward force, which can be used for lithium ion insertion space is provided between the layers, make sure not to be damaged in the process of charge and discharge in the graphene structure, so as to avoid the traditional silicon electrode material in the charge discharge electrode volume expansion problem in the process of. The stability and the number of cycles can be greatly improved by using graphene. Compared with graphite, the lattice constant of multilayer silicon is larger, and its theoretical capacity can reach about three times of that of graphite.
A layered structure with a honeycomb structure
Figure 1. A layered structure with a honeycomb structure
The results clearly show the olefinic ABA? Structure. The Dirac fermion characteristics of silicon have been determined by angle resolved photoemission spectrometer. This study shows that electrons in graphene have a very fast transmission rate and solve the problem of poor conductivity in conventional silicon materials. In addition, the study shows that the stability of silicon in the atmosphere is much higher than that of traditional silicon materials, and the structure and electronic properties of silicon are maintained. The results were recently published on Advanced Materials and ACS Central Science. The first author of this article is Dr. Zhuang Jincheng and Dr. Li Zhi of the University of Wollongong.
Silicon atoms and calcium atoms are alternately arranged in a layered structure prepared by solid phase method. The calcium is removed by chemical intercalation, and then the independent amorphous silicon is obtained. The use of this chemical silylenes cathode prepared as lithium batteries, high capacity with silicon based materials and graphite materials with good cycle performance has become a very promising anode material for lithium ion batteries.
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