| abstract |
The invention discloses a preparation method and a purification method of a compound containing at least one cyclic ligand structure, wherein the compound of the cyclic ligand structure contains 1-2 cyclic ligands with different structures, namely L a And/or containing L b The cyclic ligand of (1), wherein L is a The cyclic ligand of (2) contains a sulfonyl group (-SO) 2 -), sulfinyl (-SO-), or carbonyl (C ═ O). The compound can be independently used as electrolyte lithium salt of a lithium ion battery and dissolved in an organic solvent to prepare an electrolyte solution of the lithium ion battery, or the compound and a lithium salt are dissolved in an organic solvent to prepare the electrolyte solution of the lithium ion battery, and the electrolyte solution can obviously improve the internal resistance of the lithium ion battery and has an effect on the cycle performance of the battery. |