3results about How to "Reduce interfacial internal resistance" patented technology

The present application relates to the technical field of conductive foil, specifically to a multilayer composite conductive foil and its preparation method and application, specifically comprising the following steps: S1. aluminum foil is immersed in NaOH solution and then cleaned with deionized water, dried to obtain pretreated aluminum foil; S2. using a magnetron sputtering instrument, using a Ti-Zn-C-Ni composite target material to sputter the pretreated aluminum foil, and obtaining a transition layer conductive foil after deposition; S3. the modified functional slurry is coated on the surface of the transition layer conductive foil by a doctor blade coater, then added to an oven for segmented curing, and then annealed, and after cooling to room temperature, a multilayer composite conductive foil is obtained. The present application forms a strong adhesion bottom layer with the substrate through the composite process design of sputtering and coating, blocks the corrosion of electrolyte to the substrate, and also bears the conductive and catalytic functions. The two functional layers obtained by the two processes are further fused through annealing treatment, forming a gradient interface, eliminating interlayer stress, and improving the overall structural stability.

This invention provides a bipolar electrode and a bipolar all-solid-state battery. The bipolar electrode comprises a positive electrode film, a current collector, a bulk material layer, and a carbon material layer. Through the design of the carbonaceous framework and nucleating agent in the bulk material layer, efficient and dense lithium metal deposition is achieved under high voltage conditions. The carbon material layer significantly improves the interfacial contact between the bulk material layer and the all-solid-state electrolyte, reduces interfacial resistance, and improves the deposition and extraction efficiency of lithium metal in the bulk material layer. Furthermore, the carbon material layer provides storage space for lithium metal deposited from the positive electrode, mitigating volume changes during lithium metal deposition in the bulk material layer and improving the stability of the bipolar electrode. The bipolar all-solid-state battery fabricated using the bipolar electrode exhibits high rate capability and long lifespan.

This application provides an electrolyte, a secondary battery, and an electrical device. The electrolyte includes a lithium salt, a non-aqueous solvent, a first additive, and a second additive. The first additive is a compound having a structure as shown in Formula I: Formula I, where n is a natural number, 1 ≤ n ≤ 8. The second additive includes at least one of lithium difluorooxalatoborate, lithium difluorodioxalatophosphate, and lithium fluorosulfonate. Adding a trithiocarbonate additive containing cyano and trimethoxysilane substituents, as well as a lithium salt-based second additive, to the electrolyte can significantly improve the interfacial stability and reduce the interfacial internal resistance of the secondary battery, thereby enhancing the electrochemical performance of the secondary battery at high voltages.