Polymer-modified porous material, membrane electrode, secondary battery, and electric device
A polymer-modified porous material, a membrane electrode, and applications thereof are disclosed. The polymer-modified porous material includes a porous material and a plurality of surface groups attached to the porous material; each of the surface groups includes a linking group and an adhesive group that are attached in sequence; the linking group has a structure represented by a structural unit I, wherein represents that O is linked to the porous material; the number of the structural units I in each of the surface groups is independent from each other; the total number n of moles of the structural units I in the polymer-modified porous material is 1,000-10,000; and the total number m of moles of the adhesive groups is 10-1,000, and n/m=10-1,000. The problem of serious self-discharge of existing membrane electrodes is alleviated.
1. A polymer-modified porous material, wherein the polymer-modified porous material comprises a porous material and a plurality of surface groups attached to the porous material, each of the plurality of surface groups comprising a linking group and an adhesive group that are attached in sequence, the linking group having a structure represented by a structural unit I,
wherein represents that O is linked to the porous material; the number of the structural units I in each of the plurality of surface groups is independent from each other; and the total number n of moles of the structural units I in the polymer-modified porous material ranges from 1,000 to 10,000;
a monomer forming the adhesive group is selected from any one or more of the group consisting of acrylic acid, ethylene, vinyl alcohol, ethylene imine, propylene, acrylonitrile, vinylidene fluoride, and tetrafluoroethylene; the number of the adhesive groups in each of the plurality of surface groups is independent from each other; the total number m of moles of the adhesive groups in the polymer-modified porous material ranges from 10 to 1,000, and n/m=10-1,000.
2. The polymer-modified porous material according to claim 1 , wherein m=50-500.
3. The polymer-modified porous material according to claim 1 , wherein the porous material is selected from any one or more of the group consisting of diatomite, zeolite, montmorillonite, kaolin, and a metal-organic framework material.
4. The polymer-modified porous material according to claim 1 , wherein the polymer-modified porous material has a D V50 of 2 μm-15 μm.
5. A membrane electrode, comprising a pole plate and a separator, the pole plate comprising a current collector and an active material layer disposed on at least one surface of the current collector, the separator being disposed on a surface of the active material layer facing away from the current collector, wherein the separator comprises the polymer-modified porous material according to claim 1 .
6. The membrane electrode according to claim 5 , wherein the separator has a thickness ranging from 2 μm to 80 μm.
7. The membrane electrode according to claim 5 , wherein the pole plate is a negative pole plate.
8. The membrane electrode according to claim 5 , wherein a peel strength between the separator and the active material layer ranges from 5.5 N/m to 15 N/m.
9. A secondary battery, comprising a membrane electrode, wherein the membrane electrode is the membrane electrode according to claim 5 .
10. An electrical device, comprising a secondary battery or a battery module or a battery pack comprising the secondary battery, wherein the secondary battery is the secondary battery according to claim 9 .
11. The polymer-modified porous material according to claim 1 , wherein n=5,000-10,000.
12. The polymer-modified porous material according to claim 1 , wherein n/m=50-500.
13. The polymer-modified porous material according to claim 1 , wherein m=50-500, n=5,000-10,000 and n/m=10-1,000.
14. The polymer-modified porous material according to claim 1 wherein n=1,000-10,000, m=10-1,000 and n/m=50-500.
15. The polymer-modified porous material according to claim 1 , wherein the polymer-modified porous material has a BET specific surface area of 10 g/m 2 to 80 g/m 2 .
16. The membrane electrode according to claim 5 , wherein the separator has a thickness ranging from 5 μm to 50 μm.
17. The membrane electrode according to claim 5 , wherein a peel strength between the separator and the active material layer ranges from 6 N/m to 14 N/m.