Preparation method and application method of lithium battery negative electrode current collector surface modifier for preventing lithium dendrite deposition

The invention provides a preparation method and an application method of a lithium battery negative electrode current collector surface modifier for preventing lithium dendrite deposition. The lithiumbattery negative electrode current collector surface modifier for preventing lithium dendrite deposition provided by the invention is a chain polymer solution containing a large number of lithium-philic group amido bonds; and under the action of an initiator solution and a catalyst, based on an atom transfer radical reaction principle, a surface of the copper foil is modified with a ''brush-shaped'' polymer layer, the polymer layer can help homogenize nucleation of lithium metal and flattening growth of lithium metal, and lithium affinity of amido bonds is beneficial to homogenized mass transfer of lithium ions so that nucleation sites of lithium metal are uniformly distributed, and lithium metal dendrites are prevented from being generated. A modification method disclosed by the invention is simple and feasible,