二甲基亚砜在锂二次电池中的应用

Application of Dimethyl Sulfoxide as Solvent of Electrolyte Solution in Rechargeable Lithium Metal Batteries

采用二甲基亚砜(DMSO)作为锂二次电池的电解液,研究了锂在DMSO中的沉积形貌和循环效率.比较了六氟磷酸锂(LiPF6)在DMSO、碳酸丙烯酯(PC)和1,3-二氧环戊烷(DOL)3种溶剂中的沉积形貌和循环效率,并研究了LiPF6、四氟硼酸锂(LiBF4)、高氯酸锂(LiClO4)和二(三氟甲基磺酰)亚胺锂(LiTFSI)4种锂盐在DMSO中的沉积形貌和循环效率.结果表明,锂在DMSO中沉积得到的表面光滑平整且致密均匀,循环效率在前10周要高于在PC中的,溶剂DMSO有望用于金属锂二次电池中.

Dimethyl sulfoxide（ DMSO） was used as the solvent of electrolyte in the rechargeable lithium metal batteries. The lithium deposition morphology and cycling efficiency in DMSO, propylene carbonate（ PC） and 1,3-dioxolane（ DOL） with lithium hexafluorophosphate （ LiPF6 ） as the solute and in DMSO with lithium hexafluorophosphate（ LiPF6 ） , lithium tetrafluoroborate （ LiBF4 ） , lithium perchlorate （ LiClO4 ） or lithium bis （ trifluoromethane sulfonimide） （ LiTFSI） ] as the solute respectively were investigated and compared. The re-suts show that Li surface deposited in the DMSO solution was smooth and uniform and the lithium cycling effi-ciency in the DMSO solvent was higher than that in PC solvent in the first ten cyclings.