The Research Of Anode Materials For Lithium Ion Battery And Catalyst For ORR

Due to the low conversion efficiency, low reservation, and serious pollution problem of the traditional fossil fuels, researchers are forced to seek new clean energy with high efficiency. Energy conversion and storage devices such as fuel cells, supercapacitors and lithium ion batteries have been intensively studied.. The conversion and storage of energy are two main aspects of the efficient use of energy. The self-charging cell is a novel concept which combines the conversion and storage of energy. Both in energy conversion and storage technology, the electrode materials is vital. In this paper, we prepared a variety of nano materials and studied their structural and electrochemical properties. The main content of this work are as follows: 1. Hydrothermal synthesis method was used to prepare a large number of different morphology of tin sulfide（SnS₂） nano-materials. Different surfactants and synthetic temperature are important factors influencing the nano-structure of tin sulfide. The electrochemical test results show that the SnS₂ balls assembled by SnS₂ nanorods has better charge/discharge cycling performance compare with SnS₂ nanoplates.. This is due to the rod-like structures have high specific surface area and short ion transfer paths. Together with the simplicity, low cost, and high yield synthesis methods, the self-assembled by SnS₂ nanorods with spherical structure are promising anode materials for lithium-ion batteries. 2. Cation exchange resin was used as carbon source, Sn2+ ion was exchanged into the resin. After pyrolysis at high temperatures under inert gas atmosphere, a nano-scale Sn/C composite material was prepared. The Sn nano particles distribution uniformly on the graphitized carbon material, which will suppress the volume expansion of Sn during the charge and discharge process and increase the conductivity. This structure can significantly increase the transfer of lithium-ion and electron, promoting the electrochemical properties of lithium ion batteries. The synergistic effect of carbon and Sn nano particles brings high performance as anode materials for lithium-ion batteries. 3. The cation exchange resin was pyrolyzed at high temperature to get a honeycomb like carbon material and then doped with NH3 or glycine at high temperature. The carbon materials doped with different nitrogen source exhibit different electrochemical properties. It is found that the nitrogen content has great influence on the electrochemical properties. Glycine is proved to be able to introduce more nitrogen atoms and thereby promotes the oxygen reduction reaction.