A current collector may comprise a strength enhancement layer and a current collecting layer, wherein the current collecting layer may be stacked and bonded with the strength enhancement layer, and the current collecting layer may comprise a foam metal portion and a solid metal portion.

The present application provides a current collector and a preparation method therefor, a secondary battery, a battery module, a battery pack and a power consuming device. The current collector may comprise a strength enhancement layer and a current collecting layer. The current collecting layer may comprise a first foam metal layer that may be stacked and bonded with the strength enhancement layer and a second foam metal layer that may be provided on the side of the first foam metal layer away from the strength enhancement layer and may be stacked with the first foam metal layer, the second foam metal layer having a porosity greater than that of the first foam metal layer.

The present application provides a current collector and a preparation method therefor, a secondary battery, a battery module, a battery pack and a power consuming device. The current collector may comprise a strength enhancement layer and a current collecting layer. The current collecting layer may comprise a first foam metal layer that may be stacked and bonded with the strength enhancement layer and a second foam metal layer that may be provided on the side of the first foam metal layer away from the strength enhancement layer and may be stacked with the first foam metal layer, the second foam metal layer having a porosity greater than that of the first foam metal layer.

A secondary battery negative electrode according to the invention includes: a three-dimensional current collector formed of a self-supporting sponge-like structure of carbon nanotubes; a metal active material contained inside the three-dimensional current collector; and a plurality of seed particles contained inside the three-dimensional current collector and made of a material different from the metal active material, in which the secondary battery negative electrode does not include a foil of the metal active material.

Provided is an air electrode/LDH separator assembly including: a rigid porous layer having rigidity and air permeability, wherein the rigidity is defined as a proportion of displacement in a compression direction of less than 3% when pressurized at 0.1 MPa; an air electrode layer that covers both sides of the rigid porous layer, or both sides and end faces of the rigid porous layer provided that at least one end face is excluded; and a layered double hydroxide (LDH) separator that covers an outside of the air electrode layer; wherein i) the rigid porous layer is made of a metal or an electrically conductive ceramic, whereby the rigid porous layer itself functions as a positive electrode current collector, or ii) the rigid porous layer is made of an insulating material and is covered with a porous metal layer, whereby the porous metal layer functions as a positive electrode current collector.

Provided is an air electrode/LDH separator assembly including: a rigid porous layer having rigidity and air permeability, wherein the rigidity is defined as a proportion of displacement in a compression direction of less than 3% when pressurized at 0.1 MPa; an air electrode layer that covers both sides of the rigid porous layer, or both sides and end faces of the rigid porous layer provided that at least one end face is excluded; and a layered double hydroxide (LDH) separator that covers an outside of the air electrode layer; wherein i) the rigid porous layer is made of a metal or an electrically conductive ceramic, whereby the rigid porous layer itself functions as a positive electrode current collector, or ii) the rigid porous layer is made of an insulating material and is covered with a porous metal layer, whereby the porous metal layer functions as a positive electrode current collector.

The present invention provides a secondary battery having a novel structure in which unit cells which become thinner in one direction are radially assembled, and a device comprising same, and when a collector having a through-hole in the thickness direction is to be applied, the variation range of the concentration of the electrolyte in the battery is reduced, helping to improve the performance of the battery.

An air electrode including a multi-layer structure with an extended three-phase boundary for a lithium-air secondary battery composed of a lithium anode, a separator, and the air electrode includes an electrode current collector having a shape of a metal foam, and conductor layers disposed on top of and beneath the electrode current collector to form a multi-layer structure together with the electrode current collector.

The present invention aims to provide an electrode for lithium ion batteries which exhibits excellent electrical conductivity even if its thickness is large. The electrode for lithium ion batteries of the present invention includes a first main surface to be located adjacent to a separator of a lithium ion battery and a second main surface to be located adjacent to a current collector of the lithium ion battery. The electrode has a thickness of 150 to 5000 μm. The electrode contains, between the first main surface and the second main surface, a conductive member (A) made of an electronically conductive material and a large number of active material particles (B). At least part of the conductive member (A) forms a conductive path that electrically connects the first main surface to the second main surface. The conductive path is in contact with the active material particles (B) around the conductive path.

An anode for batteries having a columnar nanostructured porous germanium for its active material. This nanostructured porous germanium can be produced with the novel etching method disclosed herein. Such anode can be easily mass-produced with the presented method that requires pre-existing, affordable and easy to integrate equipment. In some embodiments, the produced columnar porous germanium can be directly used as a monolithic anode after its etching nanostructuration for on-chip anodes for example, where the anisotropic nanostructured germanium acts as the active material and where the remaining bulk germanium layer act as the current collector. This can be easily implemented in lithium batteries. The cycle life of such anodes could be extended by a factor of 26 and 1.8 for high rate and high energy applications, respectively.