LITHIUM METAL NEGATIVE ELECTRODE, SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK, AND ELECTRIC APPARATUS

1 . A lithium metal negative electrode, comprising:

a substrate;

lithium metal; and

a fiber layer;

wherein:

the substrate comprises a copper mesh;

the copper mesh is plated with the lithium metal; and

the copper mesh and the fiber layer are composited.

2 . The lithium metal negative electrode according to claim 1 , wherein the copper mesh has a pore area of 1×10 −4 mm 2 to 4×10 −4 mm 2 .

3 . The lithium metal negative electrode according to claim 1 , wherein a single copper wire in the copper mesh has a diameter of 1 mm to 2 mm.

4 . The lithium metal negative electrode according to claim 1 , wherein the substrate further comprises copper foils, the copper foils being connected to two sides of the copper mesh.

5 . The lithium metal negative electrode according to claim 1 , wherein the fiber layer has a thickness of 1 mm to 2 mm.

6 . A preparation method of lithium metal negative electrode, comprising:

preparing a copper mesh;

performing surface treatment on the copper mesh to remove a surface oxide layer, and then plating the copper mesh with lithium metal; and

compositing a fiber layer and the copper mesh plated with the lithium metal to obtain a lithium metal negative electrode.

7 . The preparation method according to claim 6 , wherein the copper mesh is plated with the lithium metal at a speed of 20 μA to 40 μA for 4 h to 8 h.

8 . The preparation method according to claim 6 , wherein the fiber layer is a glass fiber layer, a polypropylene fiber layer, a polyacrylonitrile fiber layer, or a polyester fiber layer.

9 . The preparation method according to claim 6 , wherein the compositing is implemented through a rolling method or a chemical crosslinking method.

10 . The preparation method according to claim 9 , wherein the chemical crosslinking method comprises:

dispersing an initiator and polymer monomers in an organic solvent to produce a mixed solution; and

applying the mixed solution onto the copper mesh plated with the lithium metal;

wherein under the action of the initiator, a polymerization reaction takes place, forming the fiber layer on the copper mesh.

11 . The preparation method according to claim 10 , wherein:

the polymer monomer is one of methyl methacrylate, styrene, acrylonitrile, and 1,3-dioxocyclopentane;

the initiator is lithium difluorosulfonimide;

the polymerization reaction takes place under protection of an inert gas atmosphere;

a temperature of the polymerization reaction is 50° ° C. to 60° C.; and

a time of the polymerization reaction is 20 min to 40 min.

12 . A secondary battery, comprising the lithium metal negative electrode prepared using the preparation method according to claim 6 .