Summary:

The invention belongs to the technical field of lithium battery, and specifically discloses a composite metal lithium anode and its preparation method and application, which comprises a three-dimensional carbon-based current collector of porous structure, a lithium metal attached to the surface and internal pores of the three-dimensional carbon-based current collector, and a protective film covering lithium metal; the protective film comprises a liviophilic metal and a lithium salt, and the liviophilic metal is a metal that can be replaced by lithium metal reduction; The composite lithium metal anode reacts with the electrolyte to form a stable solid electrolyte phase interface during the first charge and discharge, and the solid electrolyte phase interface will not decompose in the subsequent charge and discharge process. The three-dimensional carbon-based current collector, lithium-philic metal and lithium salt in the composite metal lithium anode of the present invention respectively play the role of alleviating the volume strain of the anode, inducing the uniform deposition of lithium and forming a stable SEI film on the surface of the anode, and its preparation method is simple, practical, low cost, and it is used for the lithium metal secondary battery, which can greatly improve the cycle life of the battery and improve the battery performance.

Link: http://epub.cnipa.gov.cn/patent/CN113629236A?8kt2YOWWXQBD=1667820660296