Al2O3/P2O5摩尔比对动力锂电池封接玻璃结构与性能的影响OA

This study presents a new kind of sealing glass based on P2O5-Al2O3-B2O3-R2O-NaF system,which exhibits a high coefficient of thermal expansion(CTE)suitable for sealing power lithium batteries.The effects of Al2O3/P2O5 molar ratio on the structure,thermal properties,sealing performance and chemical stability of the sealing glass were characterized.The results show that as the Al2O3/P2O5 molar ratio increases from 0.35 to 0.76,the number of P-O-P bridge oxygen bonds within the glass structure gradually decreases,and the content of[AlO4]tetrahedra initially increases and then decreases,leading to an initial increase in the compactness of the phosphate glass network structure,followed by a decrease.Correspondingly,the CTE of the glass firstly decreases from 164.5×10-7℃-1 to 160.0×10-7℃-1,and then gradually increases to 175.9×10-7℃-1,while the sealing temperature initially rises to 588℃and subsequently falls to 549℃.The acid resistance of the glass also follows this trend,initially improving and then deteriorating.The phosphate sealing glass prepared in this study displays proper balance among high CTE,low sealing temperature and excellent chemical stability,providing theoretical and technical support for the development of a low-temperature sealing process for the electrodes of power lithium batteries.