Surface treatment composition, electrode and preparation method thereof, secondary battery, and device
A surface treatment composition includes, expressed as parts by weight, a first ingredient of 1 to 30 parts and a second ingredient of 1 to 30 parts. The first ingredient is a polycaprolactone modified with an acidic group and/or a salt of the acidic group. The second ingredient is selected from polyether-modified polyolefin acid, polyether-modified polyalkenoate salt, polyether-modified polyalkenoate ester, or a combination thereof.
1. A surface treatment composition, comprising, expressed as parts by weight:
a first ingredient of 1 to 30 parts; and
a second ingredient of 1 to 30 parts;
wherein:
the first ingredient is a polycaprolactone modified with an acidic group and/or a salt of the acidic group; and
the second ingredient is selected from polyether-modified polyolefin acid, polyether-modified polyalkenoate salt, polyether-modified polyalkenoate ester, or a combination thereof.
2. The surface treatment composition according to claim 1 , wherein:
the acidic group and/or the salt of the acidic group is selected from an acidic group, an acidic salt group, or a combination thereof;
the acidic group is selected from a hydroxyl group, a carboxylic acid group, a sulfonic acid group, or phosphoric acid group; and
the acidic salt group is selected from a hydroxylate group, a carboxylate group, a sulfonate group, a phosphonate group, or a combination thereof.
3. The surface treatment composition according to claim 1 , wherein:
in the first ingredient, a weight percent of the acidic group and/or the salt of the acidic group is 10 wt % to 40 wt %; and/or
in the second ingredient, a weight percent of a polyether group is 20 wt % to 50 wt %.
4. The surface treatment composition according to claim 1 , wherein:
a number-average molecular weight of the first ingredient is 50,000 to 150,000; and/or
a number-average molecular weight of the second ingredient is 6,000,000 to 10,000,000.
5. The surface treatment composition according to claim 1 , wherein:
a solubility of the first ingredient in water at 25° C. is at least 40 g/100 ml; and/or
a solubility of the second ingredient in water at 25° C. is at least 40 g/100 ml.
6. The surface treatment composition according to claim 1 , wherein the first ingredient comprises a substance represented by following general formula:
in the general formula:
one or more of R 11 , R 12 , R 21 , R 22 , R 31 , R 32 , R 41 , R 42 , R 51 , or R 52 are the acidic group and/or the salt of the acidic group, and remaining groups are selected from hydrogen, C 1 to C 6 alkyl, C 1 to C 6 haloalkyl, and halogen; and
n 1 is an integer greater than or equal to 1.
7. The surface treatment composition according to claim 6 , wherein one or more of R 11 , R 12 , R 21 , R 22 , R 31 , R 32 , R 41 , R 42 , R 51 , or R 52 are selected from a carboxylic acid group, a sulfonic acid group, a phosphoric acid group, a carboxylate group, a sulfonate group, or a phosphonate group.
8. The surface treatment composition according to claim 6 , wherein, at least one of R 11 , R 12 , R 21 , R 22 , R 31 , R 32 , R 41 , R 42 , R 51 , or R 52 is —OH, and at least one of R 11 , R 12 , R 21 , R 22 , R 31 , R 32 , R 41 , R 42 , R 51 , or R 52 is —COOH.
9. The surface treatment composition according to claim 6 , wherein one of R 11 , R 12 , R 21 , R 22 , R 31 , R 32 , R 41 , R 42 , R 51 , or R 52 is —OH, and one of R 11 , R 12 , R 21 , R 22 , R 31 , R 32 , R 41 , R 42 , R 51 , or R 52 is —COOH.
10. The surface treatment composition according to claim 6 , wherein one of R 11 , R 12 , R 21 , R 22 , R 31 , R 32 , R 41 , R 42 , R 51 , or R 52 is —OH, one of R 11 , R 12 , R 21 , R 22 , R 31 , R 32 , R 41 , R 42 , R 51 , or R 52 is —COOH, and the —OH and the —COOH are linked to different carbon atoms.
11. The surface treatment composition according to claim 6 , wherein one of R 41 or R 42 is —OH, and one of R 21 or R 22 is —COOH.
12. The surface treatment composition according to claim 1 , wherein the second ingredient comprises a substance represented by following general formula:
in the general formula:
one or more of R 61 and R 62 are polyether groups;
R 71 is selected from a hydrogen atom, C 1 to C 10 alkyl, C 1 to C 10 haloalkyl, and halogen;
R 72 is selected from carboxyl, a carboxylate group, C 1 to C 3 alkyl carboxyl, a C 1 to C 3 alkyl carboxylate group, an ester group, and a C 1 to C 3 alkyl ester group; and
n 2 is an integer greater than or equal to 1.
13. The surface treatment composition according to claim 12 , wherein the polyether group is selected from a polyethylene glycol diglycidyl ether group, a polyether polyol group, and a combination thereof.
14. The surface treatment composition according to claim 12 , wherein:
R 61 is a hydrogen atom, and R 62 is a polyether polyol group; and/or
R 71 is a hydrogen atom, and R 72 is selected from a hydrogen atom, C 1 to C 10 alkyl, C 1 to C 10 haloalkyl, and halogen.
15. An electrode, comprising:
a current collector;
an active material layer, wherein the active material layer covers at least a part of a surface of the current collector; and
an intermediate layer, wherein the intermediate layer is located between the current collector and the active material layer;
wherein the intermediate layer comprises the surface treatment composition according to claim 1 .
16. The electrode according to claim 15 , wherein:
the electrode is a negative electrode; and/or
a material of the current collector comprises copper or a copper alloy.
17. A secondary battery, comprising the electrode according to claim 15 .
18. A device, comprising the secondary battery according to claim 17 , wherein the secondary battery is configured to provide electrical energy to the device.