Electrochemical Properties Research On Squaric Acid Electrolyte Of Li-ion Batteries With Liquid States And Polymer Electrolyte Films

The lithium-ion battery possess high operating voltage, high specific capacity and energy density were compared to other secondary batteries. The lithium-ion battery is one of the most active research fields in modern science. Electrolyte is a blood of battery, transimiting electric charge function as a lithium-ion battery tache. So it is very sense of researching the electrolyte.The squaric acid, croconate acid, salicylic acid which contain hydroxy 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 five chapters.In the first chapter, reviewed the characteristic, structure of lithium-ion battery. Based on the general analysis of summarizations, many lithium borates are described in order to make up molecular designing, self-assembly more easily.In the second chapter, a series of lithium borates are synthesized by literatures which including LBSQ, LBCB, LSCB and LBSB. Their constitution and structure have been characterized by ICP analysis.In the third chapter, according to solubility, we choose lithium borates were examined by conductivity and cyclic voltammetry (CV) measurements in PC, PC+DME, EC+DME, PC+THF, EC+THF, (molar ratio 1:1) solutions.In the fourth chapter, as LBSQ, LBCB have not good solubility, we use polymer electrolyte films to measure.In the fifth chapter, gives a general overview on the achievements and the deficiency during study of this thesis. Some prospects and suggestions of the possible future research directions are pointed out.In summary, a series of lithium borates are selected, their electrochemical properties have also been studied. Comparing to traditional lithium borate LBSB, a good conclusion can be got in this work.