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Preparation and properties of electrolyte material of the lithium-ion battery , lithium hexafluorophosphate

Author: ShaShunPing
Tutor: MaPeiHua
School: Institute of Qinghai Salt Lake
Course: Inorganic Chemistry
Keywords: A lithium ion secondary battery Lithium hexafluorophosphate Solvent Preparation Characterization
CLC: TM912
Type: Master's thesis
Year: 2005
Downloads: 838
Quote: 9
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Abstract


Lithium ion secondary battery is the nickel-cadmium batteries, nickel metal hydride batteries after the third generation of compact, high energy density batteries, which are environmentally friendly battery, on behalf of the advanced level of the battery technology. The research and development of high-performance electrolyte materials is one of the key technologies of the lithium ion secondary battery. LiPF 6 for its excellent performance has been recognized is the best lithium-ion battery electrolyte material. This paper analyzes the domestic and foreign LiPF 6 Research, found that although many researchers have done a lot of research, and the development of the traditional methods, complexation, the solution method and other methods to prepare LiPF 6 electrolyte material, and the material properties in a certain extent, improved, but because these methods is not a complex process, that is, the higher cost, the equipment requirements, there are still certain drawbacks in the large-scale production. Research and development can not only be applied to large-scale production, it also enabled the LiPF prepared 6 with excellent electrochemical properties of simple, environmentally friendly process route remains is the weight of the lithium-ion battery electrolyte materials research in the weight. To solve this problem, this paper carried the the lithium hexafluorophosphate laboratory synthesis and electrochemical performance studies, for preliminary studies for the establishment of the binding characteristics of salt lake resources development Production of lithium hexafluorophosphate. In order to play a role in promoting the development of the domestic production of lithium hexafluorophosphate and lithium industry. The main research contents are as follows: (1) summarizes the superiority of the the solvent prepared LiPF 6 , and on this basis, the improved method, simplified procedure, developed rich salt lake primary lithium carbonate The raw material, low toxicity, low corrosion acetonitrile as the method and conditions of the solvent-free synthesis of high purity lithium ion secondary battery electrolyte of lithium hexafluorophosphate. (2) the use of infrared spectroscopy for structural identification, qualitative X-ray diffraction method. The results showed that domestic product has reached the standard of similar products. (3) preliminarily determined by thermal analysis of the process of thermal decomposition of the sample. thermal homemade LiPF - differential thermal analysis showed: the lithium hexafluorophosphate's decomposition is a complex process, in the ordinary laboratory conditions should be two-step decomposition, the specific decomposition mechanism needs further research. (4) the LiPF homemade 6 dubbed lithium ion battery electrolyte, measured for the experimental battery electrochemical performance with high ionic conductivity, excellent electrochemical intercalation delithiation performance and good cycling performance. The findings of this paper, the development of industrial applications of synthetic method extended LiPF 6 preparation, in-depth understanding of the basic theory of the electrolyte material prepared further understanding the LiPF 6 of nature and electrochemical properties, have a certain referential significance.

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