Organic Electrolyte Lithium Ion Secondary Battery

With the rapid development of lithium batteries as well as energy and environmental concerns, people have being high demands on lithium ion secondary batteries. Electrolyte, one of the most important parts of lithium ion secondary batteries, has many merits such as large specific capacity, long cycling life, low cost, and easy recycle. Compared to polymer electrolytes and inorganic electrolytes, organic electrolytes were used widely because of its low price, easy synthesis, convenient operation and high voltage. The common compatibility of organic electrolyte with both positive and negative electrode materials were investigated via SEM, EDAX and FTIR to solve the battery-swell by additives injection, and improves performance of solid electrolyte interface (SEI) of negative electrodes. But it also has several disadvantages, such as low safety and low over-charge performance. The paper researches the common compatibility of organic electrolyte with both positive and negative electrode materials, solves the battery-swell by additives injection, and improves performance of Solid Electrolyte Interface of negative electrode.The solid electrolyte interface (SEI) is formatted on the surface of negative electrode during the initial several cycles deriving from theformation of LiPF6, CH2OCO2Li, Li2CO3 and EC with FTIR spectra. The LB-321B has the better compatibility with LiCoO2, and so do the TC-E102 with LiMn2O4. By injecting VB and VD, we solve the battery-swell and improve performance of solid electrolyte interface of negative electrode.Based on research the application of organic electrolyte in lithium ion batteries, we also discussed the corelation between conductivity and organic solvent, and then made quantitative analysis on chemical melting of spinel LiMn2O4 in various organic electrolytes.