Experimental Research On Synthesis And Chemical Properties Of Lithium Borate Electrolyte Of Li-ion Batteries

The lithium-ion battery is one of the most active research fields in modern science. Because the alkane oxygen group, the carboxyl, the hydroxyl, the oxalic can form a big integration anion with B, assemble many lithium salts combining with the lithium ion which should have novel structure and a good electrichemical property.The thesis is totally divided into four chapters.In the first chapter, the based on the general investigation of literatures, the many lithium borates with big π key are described in order to make up molecular designer, self-assembly more easily.In the second chapter, the lithium salts which including oxalic/salicylic acid croconate acid and boron acid are synthesized, All of them were obtained, which have been characterized by IR, ICP, NMR analysis.In the third chapter, experiment data which include the conductivity and the oxidation potential of the lithium borates by cyclic voltammetry (CV) in different organic solvents such as PC/ DMC/DEC/ EC etc has been tested. As a result, these lithium salts have good conductivity and electrochemical property.In the fourth chapter, by a great deal of experiments and tests, three kinds of lithium salts and three lithium borates have been succeeded to synthesize, which have higher conductivity and higher oxidized potential; perhaps they are better Electrolytes and have a great deal of uses in the field of lithium-ion batteries.In summary, some Lithium salts and organic borate lithium salts with oxalic, salicylic acid, croconate acid and boron acid are synthesized throng many times,their structures and properties have also been studied combining experimental results .