A bipolar lithium secondary battery having a bipolar unit that includes a current collector with positive and negative electrodes formed on opposite sides thereof. The bipolar lithium secondary battery may prevent self-discharging and the generation of bypass currents by separating the electrolyte solutions adjacent to the electrodes having different polarities by a polymer film attached to the edge of the current collector, and by preventing the movement of the separated electrolyte solutions.

A composite current collector includes a base body, a first connecting layer and a first conductive layer, the first connecting layer bonds the first conductive layer to a first surface of the base body; a first passivation layer is formed on one surface of the first conductive layer facing toward the first connecting layer. the first passivation layer may prevent an electrolyte from contacting the first conductive layer and causing the first conductive layer to be corroded and damaged when the electrolyte enters from one surface of the first connecting layer facing away from the first conductive layer, thereby improving the stability of the current collector; an electrode plate and an electrochemical device are provide.

A battery includes: an electrode body including a positive electrode having a positive electrode active material layer formed on a positive electrode collector and a negative electrode having a negative electrode active material layer formed on a negative electrode collector. At one end of the electrode body, a positive electrode collector laminated part, in which a positive electrode collector exposed part is stacked, is present. At another end thereof, a negative electrode collector laminated part, in which a negative electrode collector exposed part is stacked, is present. The positive electrode collector laminated part and the negative electrode collector laminated part are divided into groups while the groups being shifted in position so as not to overlap on a same line in the stacking direction in the electrode body. The groups are mutually independently integrated in one unit, and all tip parts of the groups are joined with one collector terminal.

A gas diffusion layer for a metal-air battery, the gas diffusion layer including: a porous layer including non-conductive fiber structures, a conductive carbon layer including a carbon material that is disposed on a surface of a non-conductive fiber structure of the plurality of non-conductive fiber structures.

The present disclosure relates to the field of battery and, in particular, relates to a current collector, an electrode plate including the current collector, and an electrochemical device. The current collector of the present disclosure includes an insulation layer and a conductive layer. The insulation layer is used to support the conductive layer. The conductive layer is used to support an electrode active material layer and is located on at least one surface of the insulation layer. The insulation layer has a density smaller than that of the conductive layer. The insulation layer has a thickness of D1 satisfying 1 μm≤D1≤10 μm. The conductive layer has a thickness of D2 satisfying 200 nm≤D2≤1.5 μm. The insulation layer has a tensile strength greater than or equal to 150 MPa.

A battery includes a first current collector, a first electrode layer, and a first counter electrode layer. The first counter electrode layer is a counter electrode of the first electrode layer, and the first current collector includes a first electroconductive portion, a second electroconductive portion, and a first insulating portion. The first electrode layer is disposed in contact with the first electroconductive portion, and the first counter electrode layer is disposed in contact with the second electroconductive portion. The first insulating portion links the first electroconductive portion and the second electroconductive portion, and the first current collector is folded at the first insulating portion, whereby the first electrode layer and the first counter electrode layer are positioned facing each other.

A composite cathode active material, a cathode including the composite cathode active material, and a lithium battery including the cathode are provided. The composite cathode active material includes a core including a lithium metal oxide and a coating layer on the core, wherein the lithium metal oxide includes two or more transition metals including nickel (Ni), an amount of Ni within one mole of the two or more transition metals included in the lithium metal oxide is about 0.65 mol or greater, the coating layer includes LiF, and a resistance of the composite cathode active material is lower than that of the core.

The present disclosure relates to a method of electrodeposition using pulsed currents to improve the uniformity of electrodeposited materials at solid-solid interfaces. It has been demonstrated that films of electrodeposited metals can be robustly deposited at a solid-solid interface without damage to the solid-electrolyte. Furthermore, the effects of the pulse parameters, including current density, pulse width, and duty cycle have shown to have dramatic effects on the spatial distribution of the electrodeposited metal. This methodology can aid in the manufacturing of thin films and microscopic structures for application in advanced functional materials and electrochemical devices. In one embodiment, the method provides for anode-free manufacturing in which a battery is fabricated in the discharged state, with a bare current collector replacing the conventional anode, and a metal anode is then formed electrochemically on the first charge cycle by electroplating a metal contained within the cathode.

A current collector, including an insulation layer and a conductive layer. The insulation layer is a hot melt adhesive layer or a composite film layer formed by laminating a polymer layer and a hot melt adhesive layer; and the conductive layer is disposed on at least one surface of the insulation layer and bonded with the hot melt adhesive layer. The conductive layer is bonded with the hot melt adhesive layer, achieving a relatively strong bonding force between the conductive layer and the insulation layer, so that the conductive layer does not easily peel off. This application further provides an electrode plate and an electrochemical apparatus that use the foregoing current collector.

An anode-less all-solid-state battery includes a porous layer that is able to occlude and release lithium, rather than a typical composite anode including an anode active material, thereby greatly improving the energy density thereof. The all-solid-state battery includes an anode current collector layer, a porous layer provided on at least one surface of the anode current collector layer and configured to include a three-dimensionally interconnected framework so as to form pores therein, a solid electrolyte layer provided on the porous layer, and a composite cathode layer provided on the solid electrolyte layer, in which a seed material is provided at an interface between the anode current collector layer and the porous layer and at an interface between the porous layer and the solid electrolyte layer.