Lithium metal surface protection layer and preparation method thereof, lithium ion battery and vehicle

• Main Author: KANG DANMIAO
• Format: Patent
• Language: Chinese; English
• Published: 19.12.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a lithium metal surface protection layer which is characterized in that a Li-M lithium metal alloy layer, an RO-M metal alkoxide layer and a solid polymer electrolyte layer are sequentially arranged on a lithium metal negative electrode, M is selected from at least one of Ga, Sn, Co, Al and Zn, and R is alkyl with the carbon atom number of 1-15. And the solid polymer electrolyte layer also comprises an M metal oxide. According to the lithium metal surface protection layer, the matching performance between the protection layer and a lithium metal negative electrode and between the protection layer and a solid electrolyte layer is effectively improved, the physical and chemical characteristics of the whole structure are kept continuous through the transition change of a crystal coherent structure, so that the component structure continuity of the protection layer is improved, rapid transmission of lithium ions is ensured, and the service life of the lithium metal is prolonged. And the co