BINDER AND APPLICATION THEREOF
A binder includes a polymer obtained by polymerizing at least a first component, a second component, and a third component. The first component includes a flexible monomer selected from C 4-18 alkene. The second component includes a rigid monomer including at least one of an alkene having a rigid group or a polymerized monomer having a strong polar group. The rigid group is selected from C 5-20 aryl, C 4-8 saturated or unsaturated ring group, and C 5-30 heterocyclyl. The third component includes a hydrophilic monomer containing a hydrophilic group selected from carboxyl, hydroxyl, amine, aldehyde, alcohol, amino, and amido.
1 . A binder, comprising a polymer obtained by polymerizing at least following components:
a first component comprising a flexible monomer selected from C 4-18 alkene;
a second component comprising a rigid monomer, the rigid monomer comprising at least one of:
an alkene having a rigid group, wherein the rigid group is selected from C 5-20 aryl, C 4-8 saturated or unsaturated ring group, and C 5-30 heterocyclyl; or
a polymerized monomer having a strong polar group; and
a third component comprising a hydrophilic monomer, wherein the hydrophilic monomer contains a hydrophilic group, and the hydrophilic group is selected from carboxyl, hydroxyl, amine, aldehyde, alcohol, amino, and amido.
2 . The binder according to claim 1 , wherein based on a total molar amount of the first component, the second component, and the third component, a molar proportion of the first component is in a range of 30%-55%, a molar proportion of the second component is in a range of 15%-45%, and a molar proportion of the third component is in a range of 15%-30%.
3 . The binder according to claim 1 , wherein the binder is a gel polymer.
4 . The binder according to claim 1 , wherein a viscosity of the binder is in a range of 70000 to 500000 mPa·s.
5 . The binder according to claim 1 , wherein a weight average molecular weight of the binder is in a range of 300000 to 1000000.
6 . The binder according to claim 1 , wherein a solid content of the binder is in a range of 4% to 10%.
7 . The binder according to claim 1 , wherein a glass transition temperature Tg of the binder is in a range of 60-200° C.
8 . The binder according to claim 1 , wherein a pH value of the binder is in a range of 5.0-8.0.
9 . A negative electrode sheet, comprising:
a negative electrode current collector; and
a negative electrode diaphragm, wherein the negative electrode diaphragm comprises the binder according to claim 1 .
10 . The negative electrode sheet according to claim 9 , wherein the negative electrode sheet is configured such that when the negative electrode sheet is wound on an object with a diameter of 32 mm, 25 mm, or 16 mm, there is no crack on a surface of the negative electrode sheet.
11 . A secondary battery, comprising the binder according to claim 1 .
12 . A battery module, comprising the secondary battery according to claim 11 .
13 . A battery pack, comprising the battery module according to claim 12 .
14 . A power consumption device, comprising the second battery according to claim 11 .