公开(公告)号：US20220021027A1

公开(公告)日：2022-01-20

申请号：US17105517

申请日：2020-11-26

Applicant: XIAMEN UNIVERSITY

Inventor： LING HUANG ,  QIONG WANG ,  YING LEI ,  CHENGUANG SHI ,  SHIGANG SUN

IPC: H01M10/0567 ,  H01M10/0525 ,  H01M4/134 ,  H01M4/136 ,  H01M4/04 ,  H01M4/66 ,  H01M10/0568 ,  H01M10/0569

Abstract: The invention discloses a lithium metal negative electrode protection method improving lithium utilization efficiency, and relates to the field of lithium batteries. In a lithium battery, lithium metal is deposited on a current collector as a battery negative electrode, and a high molecular polymer is added as an additive to an ester electrolyte. In the present application, the high molecular polymer is prepared by a polymerization reaction of monomer A being acrylonitrile or derivatives thereof, monomer B being perfluoroalkyl ethyl methacrylate or derivatives thereof, and monomer C being alkyl alcohol diacrylate or derivatives thereof. Due to the negative charge on the surface of lithium metal, the —CN and —CF3 in the polymer are strong electron-withdrawing groups, which promote the preferential adsorption of electrolyte additives on the surface of lithium metal and reduce the contact of other components in the electrolyte with lithium metal.