Binder and rechargeable battery containing same
A rechargeable battery and binder technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as pole piece fracture and active material falling off, and achieve high adhesion, low crystallinity, and high flexibility. Effect
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Embodiment 1-4
[0066] Examples 1-4 are respectively a kind of binder, which are all formed by copolymerization of isobutyl vinyl ether, 2,2,2 trifluoroethyl methacrylate, acrylamide and hydroxyethyl acrylate. Specifically, the composition of the binder in Example 1 is listed in Table 1.
[0067] Table 1
[0068]
[0069]Wherein, the binders in Examples 1-4 are all prepared by emulsion polymerization. Specifically, the process steps of the preparation method are: add deionized water and emulsifier in a three-necked flask, and then feed nitrogen to remove oxygen. Add a certain amount of monomers in Table 1, then add an initiator, raise the temperature, control the temperature, and start the polymerization reaction. After a period of reaction, add the remaining monomers and initiators. After the polymerization is completed, the obtained solid content is 20%~ The 30% stable emulsion has a number average molecular weight of 300,000 to 1,000,000.
Embodiment 5-8
[0138] Embodiments 5-8 are respectively a kind of binder, and its difference from Example 1 is that the monomer composition of the binder in Examples 5-8 is different from that of Example 1, and the specific components are listed in Table 8 .
[0139] Table 8
[0140]
[0141] Wherein, the vinyl ether monomer, fluorine-containing acrylate monomer, acrylamide monomer and acrylate monomer used in Examples 5-8 are the same as those in Example 1.
Embodiment 9-13
[0143] Examples 9-13 are respectively a kind of binder, and its chemical formula can be represented by formula V, and the difference between them and Example 1 lies in the specific composition.
[0144]
[0145] Among them, R 1 ~R 9 The substituents are shown in Table 4, a, b, c, and d are mole percentages, and their values are shown in Table 9 and Table 10.
[0146] Table 9
[0147] serial number R 1
R 2
R 3
R 4
R 5
R 6
R 7
R 8
R 9
Example 9 -H -H -H -H -H -H -CF 3
-H -H Example 10 -CH 3
-H -H -H -H -H -CF 3
-H -H Example 11 -CH 3
-CH 3
-CH 3
-H -H -H -H -H -CH 3
Example 12 -H -H -CH 3
-H -H -H -H -H -CH 3
Example 13 -H -H -CH 3
-H -H -H -CF 3
-H -CH 3
[0148] Table 10
[0149]
[0150]
[0151] After testing, the Raman shifts of the binders in Examples 5-13 are shown in Table 11.
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