LITHIUM COATING COMPOSITION, NEGATIVE ELECTRODE PLATE, SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK, ELECTRICAL APPARATUS, METHOD AND APPLICATION

1 . A lithium coating composition, comprising a lithium-containing metal and a polymer chemically connected to a lithium surface in the lithium-containing metal, the polymer having a structure shown in Formula I:

wherein:

each occurrence of Rf independently represents a fluorine-substituted aliphatic group;

each occurrence of X independently represents H or an electron-withdrawing group;

each occurrence of Z independently represents O, S, or NR 11 , wherein R 11 is H or C 1-3 alkyl;

* indicates a site connecting a terminal group;

n is an integer ≥10; and

at least one cyano group in the polymer forms a chemical connection with lithium in the lithium-containing metal.

2 . The lithium coating composition according to claim 1 , wherein for each occurrence of Rf, a fluorine substitution rate in Rf independently satisfies >50%.

3 . The lithium coating composition according to claim 1 , wherein for each occurrence of Rf, a number of fluorine atoms in Rf is independently an integer ≥4.

4 . The lithium coating composition according to claim 1 , wherein a mass proportion of fluorine element in the polymer is selected from 30% to 55%.

5 . The lithium coating composition according to claim 1 , wherein for each occurrence of Rf, Rf contains 2 to 10 main chain carbon atoms.

6 . The lithium coating composition according to claim 1 , wherein each occurrence of the fluorine-substituted aliphatic group independently represents a straight chain structure or a branched chain structure.

7 . The lithium coating composition according to claim 1 , wherein for each occurrence of Rf, a structure of Rf is independently shown in Formula III-1, Formula III-2, or Formula III-3:

wherein:

each occurrence of R 31 , R 32 , and R 3 independently represents H or F, each occurrence of m 3 independently represents an integer selected from 2 to 10, and Formula III-1 contains at least 4 F atoms;

each occurrence of R 41a , R 42a , R 4a , R 41b , R 42b , and R 4b independently represents H or F, each occurrence of m 4a and m 4b independently represents an integer selected from 1 to 9, and Formula III-2 contains at least 4 F atoms;

each occurrence of R 51 and R 52 independently represents H or F, each occurrence of m 5 independently represents an integer selected from 2 to 10, and Formula III-3 contains at least 4 F atoms.

8 . The lithium coating composition according to claim 1 , wherein a content of lithium in the lithium-containing metal relative to the polymer is greater than a catalyst dosage, measured in a molar ratio.

9 . A negative electrode plate, comprising:

a negative electrode plate substrate and a polymer layer which are stacked; and

wherein the negative electrode plate substrate comprises a lithium-containing layer in contact with the polymer layer, the lithium-containing layer contains lithium, and the polymer layer is chemically connected to at least a portion of lithium in the lithium-containing layer; and

wherein the polymer layer comprises a polymer having a structure shown in Formula I:

where:

each occurrence of Rf independently represents a fluorine-substituted aliphatic group;

each occurrence of X independently represents H or an electron-withdrawing group;

each occurrence of Z independently represents O, S, or NR 11 , wherein R 11 is H or C 1-3 alkyl;

* indicates a site connecting a terminal group;

n is an integer ≥10; and

at least one cyano group in the polymer forms a chemical connection with lithium in the lithium-containing layer.

10 . The negative electrode plate according to claim 9 , wherein the polymer layer further contains an electrolyte.

11 . The negative electrode plate according to claim 10 , wherein a concentration of a lithium salt in the electrolyte is selected from 0.5 mol/L to 10 mol/L.

12 . The negative electrode plate according to claim 10 , wherein a mass ratio of the polymer to the electrolyte is selected from 199:1 to 1:1.

13 . The negative electrode plate according to claim 10 , wherein a mass proportion of the electrolyte in the polymer layer is selected from 0.5% to 50%.

14 . The negative electrode plate according to claim 9 , wherein the polymer layer has an elastic modulus of 0.1 MPa to 80 MPa.

15 . The negative electrode plate according to claim 9 , wherein the polymer layer has an elastic deformation range of 20% to 500%.

16 . The negative electrode plate according to claim 9 , wherein based on the electrolyte, a swelling rate of the polymer layer is selected from 5% to 50%.

17 . The negative electrode plate according to claim 16 , wherein based on the electrolyte, an ion conductivity of the swollen polymer layer is selected from 5×10 −3 S/cm to 1×10 −6 S/cm.

18 . A secondary battery, comprising:

an electrode assembly comprising a positive electrode plate, a separator, and the negative electrode plate according to claim 9 , wherein the separator is disposed between the negative electrode plate and the positive electrode plate, and the polymer layer is at least disposed on a surface of the negative electrode plate substrate on a side close to the separator; and

a battery cell electrolyte disposed between the polymer layer and the positive electrode plate.

19 . An electrical apparatus, comprising the secondary battery according to claim 18 .

20 . A preparation method of a negative electrode plate, comprising:

providing a negative electrode plate substrate, an outermost layer on at least one side of the negative electrode plate substrate being a lithium-containing layer, and the lithium-containing layer comprising a lithium-containing metal;

providing a reaction mixture containing a monomer compound having a structure shown in Formula II and an electrolyte; and

coating the reaction mixture on the surface of the lithium-containing layer on the at least one side of the negative electrode plate substrate, and polymerizing the monomer compound in situ to form a polymer layer, wherein a reaction temperature of the in-situ polymerization is selected from 30° C. to 100° C.;

wherein:

each occurrence of Rf independently represents a fluorine-substituted aliphatic group;

each occurrence of X independently represents H or an electron-withdrawing group;

each occurrence of Z independently represents O, S, or NR 11 , wherein R 11 is H or C 1-3 alkyl.