Synthesis And Properties Research On Complexes Of Rhodizonic Acid And Borate For Li-ion Battery Electrolytes

The lithium-ion battery R&D is one of the most active research fields in modern science, and lithium-ion battery electrolyte is the most important key.The carboxyl, the croconic acid, can form a big integration anion with Boron, assemble many lithium salts combining with the lithium ion which should have novel structure and a good electrochemical property.The thesis is totally divided into four chapters.In the first chapter, reviewed the characteristic, structure and application of lithium-ion battery. Based on the general investigation of literatures, many lithium borates with bigπkey are described in order to make up molecular designing, self-assembly more easily.In the second chapter, the two lithium borates are synthesized which including LBRB and LRBB, Their constitutes and structure have been characterized by IR, ICP, NMR analysis.In the third chapter, the data which include solubility, thermodynamics stability, the conductivity of the lithium borates and the oxidation potential by cyclic voltammetry (CV) in different organic solvents such as PC/PC+DME/EC+DME/DME etc of the lithium borates have been tested. As a result, two lithium borates have good thermodynamics stability and electrochemical property, generic conductivity and solubility.In the fourth chapter, passing a great deal of experiments and tests, I have succeeded to synthesize two kinds of lithium borates which have good thermodynamics stability, generic conductivity and solubility 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, two organic lithium borates with catechol, rhodizonic acid and boron acid are synthesized, their structures and properties have also been studied combining experimental results.