Grid current collector and associated devices and methods
The present invention relates to a current collector comprising: a substrate, the substrate being made of a first material, the first material comprising a polymer, and a grid in contact with the substrate, the grid being made of a second material, the second material comprising metal particles.
1. Current collector comprising:
a substrate, the substrate being made of a first material, the first material comprising a polymer, and
a grid deposited on the substrate, the grid being made of a second material, the second material comprising metal particles.
2. Current collector according to claim 1 , wherein the second material comprises at least one element selected from the list consisting of:
electrically conductive metals and alloys; and
metal oxides.
3. Current collector according to claim 1 , wherein the grid is the repetition of a pattern.
4. Current collector according to claim 1 , wherein the current collector further comprises a coating layer, the coating layer being in contact with the grid and forming a stack of layers superposed with the substrate along a stacking direction.
5. Current collector according to claim 4 , wherein the coating layer is made according to a second composition, the second composition comprising of a conductive material and a binder material, the conductive material comprising at least one element selected from the list consisting of:
carbon,
carbon black,
graphite,
graphene,
a carbon nanotube,
an activated carbon fiber,
a non-activated carbon nanofiber,
a metal flake,
a metal powder,
a metal fiber, and
an electrically conductive polymer.
6. Current collector according to claim 5 , wherein the content by weight of binder material is greater than or equal to 30%.
7. Current collector according to claim 5 , wherein the content by weight of conductive material is greater than or equal to 20%.
8. Current collector according to claim 5 , wherein the binder material consists of one or more polymers.
9. Current collector according to claim 5 , wherein either the entire assembly of the coating layer and the grid has a thickness that is less than or equal to 15 micrometers or the stack constituted by the grid and the coating layer has a thickness that is less than or equal to 15 micrometers.
10. Current collector according to claim 1 , wherein the first material (M 1 ) is selected from the group consisting of:
a polymer comprising at least one amide functional group;
a polymer comprising at least one imide functional group;
a polymer comprising at least one imide functional group and one amide functional group;
poly(phenylene ether ether ketone); and
poly(ethylene naphthalate).
11. Assembly forming an anode or a cathode comprising:
an electrode, and
a current collector according to claim 1 .
12. Electrical energy storage device, electrochemical accumulator or supercapacitor, comprising an assembly according to claim 11 .
13. Method for manufacturing a current collector including;
a step of providing a substrate, the substrate being made of a first material, the first material comprising a polymer, and
a step of depositing a grid deposited on the substrate, the grid being made of a second material, the second material comprising metal particles.
14. Method for manufacturing a current collector according to claim 13 comprising an additional step for depositing a coating layer in contact with the grid, the coating layer being produced by depositing a composition comprising a conductive material and a binder material.
15. Method for manufacturing a current collector according to claim 13 , wherein at least one of the depositing steps is carried out by a printing technique.