Lithium ion battery electrolyte additive, lithium ion battery electrolyte and preparation method of lithium ion battery electrolyte additive

• Main Authors: SONG DAIHENG, ZHANG BOWEN, LIU YUANPENG, HAN YUZHENG, DONG LIWEI, YUAN BOTAO, HE NIANDONG
• Format: Patent
• Language: Chinese; English
• Published: 15.12.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

According to the lithium ion battery electrolyte additive, the lithium ion battery electrolyte and the preparation method of the lithium ion battery electrolyte, the lithium salt, the fluorinated solvent and the electrolyte additive are utilized to form the composite electrolyte, and the additive in the electrolyte can promote the formation of a layer of compact and passivated protective LiF film on the surfaces of a positive electrode and a negative electrode; the LiF film effectively inhibits the irreversible parasitic reaction between the lithium metal and the fluorinated solvent and the irreversible parasitic reaction among the lithium metal, the fluorinated solvent and the transition metal dissolved in the electrolyte, so that the growth of the lithium dendrites of the negative electrode is inhibited, the problem of cracking of the surface of the positive electrode under long-time cycle operation is solved, and the service life of the positive electrode is prolonged. And the lithium battery system can re