摘要
采用电导率和粘度测量的方法研究了锂电池LiClO4-PC-DMC电解液体系的离子迁移性质,以FTIR方法表征了电解液中离子与溶剂分子以及溶剂分子之间的相互作用。结果表明,LiClO4-PC-DMC电解液的电导率随LiClO4浓度的增大先增大后减小,随测量温度升高而增大;FTIR方法分析结果表明,随着PC浓度的增加混合溶剂的羰基峰紫移和DMC的醚氧不对称伸缩振动峰紫移,锂离子与溶剂分子的相互作用使羰基峰红移、醚氧不对称伸缩振动峰紫移,这种Li+与羰基氧及醚氧之间的相互作用引起了电解液的电导率随Li+浓度与混合溶剂浓度的变化而变化。当温度一定时,0.8 mol.L-1LiClO4PC-DMC(1∶1)具有较好的低温性能。
The ion transport properties of the lithium percb-lorate （LiClO4） in propylene carbonate（PC） -dimethyl carbonate （DMC） of lithium battery were characterized by conductivity, viscosity and FTIR. The results show that the conductivity of LiClO4 electrolyte firstly increases and then decreases with the increase of LiClO4 concentration. However, the conductivity of electrolytes always increases with the temperature. The FTIR results show that the peaks of υc = o andυas c - o move to higher wave numbers with the increase of the density of PC solvent. On the other hand, the peaks of υc = o andυas c - o in LiClO4 electrolyte move to lower wave numbers clue to the interaction between lithium ion and the carbonyl oxygen and the ester oxygen, which may be the reason of the conductivity of electrolyte changing with the concentration of Li ion and density of organic solvent. The electrolyte of 0.8 mol ·L^-1 LiClO4 PC-DMC（ 1： 1, mol） showed good performance at low temperature.
出处
《湖南人文科技学院学报》
2006年第6期27-30,共4页
Journal of Hunan University of Humanities,Science and Technology
关键词
锂电池
电解液
电导率
粘度
FHR
lithium battery, electrolyte, conductivity, viscosity, FTIR
