LITHIUM METAL NEGATIVE ELECTRODE PLATE, ELECTROCHEMICAL APPARATUS, AND ELECTRONIC DEVICE

1 . A lithium metal negative electrode plate, comprising:

a copper foil;

an active substance layer formed on at least part of a surface of the copper foil, wherein the active substance layer comprises a lithium metal alloy; and

a composite protection layer formed on at least part of a surface of the active substance layer, wherein thickness of the composite protection layer is less than or equal to 10 μm, and the composite protection layer comprises a lithium fluoride inorganic layer and a polymer organic layer.

2 . The negative electrode plate according to claim 1 , satisfying at least one of the following conditions:

the thickness of the composite protection layer is 0.3 μm to 10 μm; or

the thickness of the composite protection layer is 1 μm to 7 μm.

3 . The negative electrode plate according to claim 1 , satisfying at least one of the following conditions:

a mass ratio of the lithium fluoride inorganic layer and the polymer organic layer is 1:10 to 10:1; or

a mass ratio of the lithium fluoride inorganic layer and the polymer organic layer is 1:5 to 5:1.

4 . The negative electrode plate according to claim 1 , wherein the polymer organic layer comprises at least one of polydimethylsiloxane, polyacrylonitrile, polypyrrole, polyimide, polyacrylic acid, or polymethyl methacrylate.

5 . The negative electrode plate according to claim 1 , wherein the lithium fluoride inorganic layer is formed through in-situ reaction between polyvinylidene fluoride and the lithium metal alloy.

6 . The negative electrode plate according to claim 5 , satisfying at least one of the following conditions:

a chemical formula of the lithium metal alloy is LiR, wherein metal R is selected from at least one of Ag, Mo, In, Ge, Bi, or Zn;

a chemical formula of the lithium metal alloy is LiR, wherein a mass percentage of element R in the lithium metal alloy is 1% to 10%; or

the lithium metal alloy is a solid solution alloy.

7 . An electrochemical apparatus, comprising a positive electrode plate, a negative electrode plate, a separator, and an electrolyte, wherein the negative electrode plate is the negative electrode plate according to claim 1 .

8 . The electrochemical apparatus according to claim 7 , wherein the electrolyte comprises a solvent and a lithium salt, and satisfies at least one of the following conditions:

the lithium salt comprises at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium difluorophosphate, lithium bis(trifluoromethanesulfonyl)imide, lithium bis(fluorosulfonyl)imide, lithium bis(oxalato)borate, or lithium difluoro(oxalato)borate;

the solvent comprises ethylene glycol dimethyl ether and 1,3-dioxolane;

the solvent comprises ethylene glycol dimethyl ether and 1,3-dioxolane, wherein a volume ratio of the dimethyl ether and the 1,3-dioxolane is (0.5-10):1; or

a concentration of the electrolyte is 0.5 mol/L to 7 mol/L.

9 . The electrochemical apparatus according to claim 8 , wherein the electrolyte satisfies at least one of the following conditions:

the electrolyte further comprises an additive, wherein the additive comprises at least one of trioxymethylene, lithium nitrate, dioxane, lithium fluorosulfonate, or fluoroethylene carbonate; or

the electrolyte further comprises an additive, wherein a mass percentage of the additive in the electrolyte is 0.1% to 10%.

10 . An electronic device, comprising the electrochemical apparatus according to claim 7 .