Current Collector
A current collector is disclosed in the present invention. The current collector comprises a conductive substrate and a plurality of isolation regions. The conductive substrate has a plurality of holes. Each hole has two openings. The isolation regions, which only partially cover the surface of the conductive substrate, are disposed at least on the areas nearby the peripheral surface of the openings. Due to the electrical insulation of the isolation regions formed nearby the peripheral surface of the openings, the lithium ions would not deposit centrally close to the openings of the holes during the electrical-chemical reaction of the battery. Accordingly, only few lithium dendrites are formed inside the holes and grow towards the separator so that the position and the amount of the formation of the lithium dendrite can be effectively controlled. Thus, the safety of the battery can be greatly improved.
1 . An current collector, comprising:
a conductive substrate, having a plurality of holes, and each of the hole has two openings; and
a plurality of isolation regions, forming at least partially on a peripheral surface of each of the openings and at least parts of a surface of the conductive substrate are exposed.
2 . The current collector of claim 1 , wherein at least one of the isolation regions further extend outward the peripheral surface of the opening and partially cover the surface of the conductive substrate.
3 . The current collector of claim 1 , wherein at least one of the isolation regions further extend inward the peripheral surface of the opening and partially cover an inner surface of the hole.
4 . The current collector of claim 1 , wherein the isolation regions are electrical insulated.
5 . The current collector of claim 1 , wherein the isolation region comprises at least one electrical insulation material.
6 . The current collector of claim 1 , wherein the isolation region is an electrical insulation layer, or an electrical-insulation-treated surface.
7 . The current collector of claim 1 , wherein an active material layer is further disposed adjacent to the conductive substrate and the isolation regions.
8 . The current collector of claim 7 , wherein the active material layer is a lithium metal layer.
9 . The current collector of claim 1 , further comprising:
at least a ionic conductive region, being lithium-unalloyable and disposed on at least one of a surface of the conductive substrate.
10 . The current collector of claim 9 , wherein the ionic conductive region is further electrical conductive.
11 . The current collector of claim 9 , wherein the ionic conductive region is porous.
12 . The current collector of claim 9 , wherein the ionic conductive region is in a shape of layer shape, grid shape, cylindrical shape and a combination thereof.
13 . The current collector of claim 9 , wherein the ion conductive region is further made of materials selected from the group consisting of a ceramic insulating material, a polymer, a liquid electrolyte, a gel electrolyte, a solid electrolyte, a liquid ion, a conductive material and a combination thereof.
14 . The current collector of claim 13 , wherein the ceramic insulating material is made of materials selected from the group consisting of oxidized metal, sulfurized metal, nitride metal, phosphorylated metal, acidified metal and a combination thereof.
15 . The current collector of claim 13 , wherein the conductive material is made of materials selected from the group consisting of a metal, an alloy, a conductive carbon material and any combination thereof.
16 . The current collector of claim 13 , wherein the conductive carbon material comprises of carbon black, hard carbon, carbon nanotube, graphite, graphene or any other conductive carbons.