A positive electrode current collector, a positive electrode piece, an electrochemical device and an apparatus, where the positive electrode current collector includes a support layer and a conductive layer provided on the support layer, where a material of the conductive layer is aluminum or aluminum alloy, and a thickness Di of the conductive layer is 300 nm≤D.sub.1≤2 μm; an elongation at break B of the support layer is 10000%≥B≥12%, and a volume resistivity of the support layer is greater than or equal to 1.0×10.sup.−5 Ω.Math.m; when a tensile strain of the positive electrode current collector is 2%, a square resistance growth rate Ti of the conductive layer is T.sub.1≤10%. The positive electrode current collector provided in the present application can simultaneously take into account both high safety performance and electrical performance.

This application discloses a positive current collector, a positive electrode plate, an electrochemical apparatus, a battery module, a battery pack, and a device. The positive current collector includes a support layer, having two opposite surfaces in a thickness direction of the support layer; and an aluminum-based conductive layer, disposed on at least one of the two surfaces of the support layer. A thickness D.sub.1 of the aluminum-based conductive layer is 300 nm≤D.sub.1≤2 μm; a density of the aluminum-based conductive layer is 2.5 g/cm.sup.3 to 2.8 g/cm.sup.3; and when a tensile strain of the positive current collector is 2.5%, a sheet resistance growth rate T of the aluminum-based conductive layer is T≤10%. The positive current collector provided in this application has a relatively small weight and higher electrical performance, so that the electrochemical apparatus provides a higher weight energy density and higher electrochemical performance.

An electrochemical cell including a positive electrode (e.g., a cathode) and a negative electrode (e.g., an anode), at least one of which includes an integrated ceramic separator. An integrated ceramic separator may include a plurality of ceramic particles. In some examples, an interlocking region may be disposed between the integrated ceramic separator layer and a corresponding electrode layer, the region including a non-planar boundary between the two layers. In some examples, the electrochemical cell includes a polyolefin separator disposed between the positive electrode and the negative electrode. In some examples, both the positive electrode and the negative electrode include an integrated ceramic separator. In these examples, the positive electrode and the negative electrode may be calendered together such that the integrated separator layers merge and become indistinguishable from each other.

A monolithic ceramic electrochemical cell housing is provided. The housing includes two or more electrochemical sub cell housings. Each of the electrochemical sub cell housing includes an anode receptive space, a cathode receptive space, a separator between the anode receptive space and the cathode receptive space, and integrated electron conductive circuits. A first integrated electron conductive circuit is configured as an anode current collector within the anode receptive space. A second integrated electron conductive circuit is disposed as a cathode current collector within the cathode receptive space.

An electrochemical cell including a positive electrode (e.g., a cathode) and a negative electrode (e.g., an anode), at least one of which includes an integrated ceramic separator. An integrated ceramic separator may include a plurality of ceramic particles. In some examples, an interlocking region may be disposed between the integrated ceramic separator layer and a corresponding electrode layer, the region including a non-planar boundary between the two layers. In some examples, the electrochemical cell includes a polyolefin separator disposed between the positive electrode and the negative electrode. In some examples, both the positive electrode and the negative electrode include an integrated ceramic separator. In these examples, the positive electrode and the negative electrode may be calendered together such that the integrated separator layers merge and become indistinguishable from each other.

An electrochemical cell including a positive electrode (e.g., a cathode) and a negative electrode (e.g., an anode), at least one of which includes an integrated ceramic separator. An integrated ceramic separator may include a plurality of ceramic particles. In some examples, an interlocking region may be disposed between the integrated ceramic separator layer and a corresponding electrode layer, the region including a non-planar boundary between the two layers. In some examples, the electrochemical cell includes a polyolefin separator disposed between the positive electrode and the negative electrode. In some examples, both the positive electrode and the negative electrode include an integrated ceramic separator. In these examples, the positive electrode and the negative electrode may be calendered together such that the integrated separator layers merge and become indistinguishable from each other.

A composite layer for use in a lithium-based battery is disclosed. The composite layer comprises a fibrous film and an inorganic additive, wherein there is a weight ratio of the fibrous film to the inorganic additive, and the weight ratio is in a range between 5:95 and 20:80. It is worth explaining that, by letting a lithium-based battery like Li metal battery be integrated with the proposed composite layer, not only does the formation of lithium dendrite be significantly suppressed, but the decomposition of electrolyte is also effectively inhibited. Moreover, the most important thing is that, by letting the lithium-based battery be integrated with the proposed composite layer, capacity retention and coulombic efficiency of the lithium-based battery are both significantly enhanced.

Disclosed are an electrolytic copper foil the fold and/or wrinkle of which can be avoided or minimized during a roll-to-roll process, a method for manufacturing the same, and an electrode and a secondary battery which are produced with such electrolytic copper foil so that high productivity can be guaranteed. An electrolytic copper foil of the disclosure has a longitudinal rising of 30 mm or less and a transverse rising of 25 mm or less, and the transverse rising is 8.5 times the longitudinal rising or less.

Provided is a method for easily producing a thin-membrane solid electrolyte body. A molded body (11) of a first ceramic is prepared, and the molded body (11) is fired in a first temperature range to prepare a porous body (110). A thin membrane-shaped molded body (12) composed of a second ceramic containing a solid electrolyte is prepared on at least a part of a surface of the porous body (110). A dense body (120) is prepared by firing the thin membrane-shaped molded body (12). As a result, a solid electrolyte body (1) including the porous body (110) as a support and the dense body (120) of a thin membrane-shaped electrolyte integrally formed with at least a part of the surface of the porous body (110), is produced.

The present disclosure relates to a current collector production apparatus for producing a current collector. The current collector includes a current collector substrate, a conductive layer disposed on at least one surface of the current collector substrate. The current collector production apparatus includes an oven having a space where the current collector is to be heated, and a passivation ozone knife having a current collector injection port. The current collector injection port is configured to release ozone in such a manner that the ozone reacts with a surface material of the conductive layer, so as to form a passivation layer. The passivation ozone knife is disposed inside the oven. The current collector produced in the present disclosure can prevent HF in electrolyte from reacting with Al, so as to solve a problem of detachment of active material from the current collector and maintain the performance of lithium-ion battery.