34results about How to "Improve interface impedance" patented technology

The invention discloses a preparation method of a solid electrolyte with a surface coating. The preparation method comprises the steps of preparation of an LLZO ceramic chip, preparation of FS glue, formation of the solid electrolyte and the like. The invention further provides a solid-state electrolyte battery which comprises the solid electrolyte prepared by the preparation method of the solid electrolyte with the surface coating, and further comprises a positive electrode layer and a negative electrode layer which are arranged on the two sides of the solid electrolyte. The solid electrolyteprepared by the method has the advantages that firstly, an inorganic ceramic material is doped with Ga and Nb elements, so that the cubic phase structure of LLZO is stabilized, and the ionic conductivity is correspondingly improved; secondly, the two sides of the inorganic solid electrolyte are coated with the mixed fumed silica in the lithium ion electrolyte, so that the problem of interface contact is effectively solved, and the lithium ion conductivity of the lithium ion electrolyte is ensured; and the solid electrolyte of the solid electrolyte battery is prepared by the preparation methodof the solid electrolyte with the surface coating, and has the advantages of small interface impedance, high lithium ion conductivity and the like.

The invention discloses a preparation method and a battery of a solid electrolyte for controlling the orderly growth of lithium dendrites. Lamination with double-sided conductive adhesive, on the one hand, can control the growth direction of lithium dendrites in an orderly manner in the gap between the solid electrolyte and the metal lithium bonding surface, so that lithium dendrites can grow oppositely in the gap and avoid lithium dendrites. Piercing the solid electrolyte, on the other hand, the carbon coating can improve the interfacial impedance between the solid electrolyte and the cathode material and improve the conduction efficiency of lithium ions.

The invention discloses a gel composite positive pole plate. The gel composite positive pole plate is characterized by comprising a positive active substance, a conductive agent, a gel electrolyte, abinding agent and a current collector, wherein the binding agent, the conductive agent, the gel electrolyte and the positive active substance form a layered structure on a surface of the current collector, and the conductive agent and the gel electrolyte are uniformly dispersed in the positive active substrate and are associated via the binding agent. The invention also discloses a method for preparing the gel composite positive pole plate and a method for preparing an all-solid-state lithium battery.

The invention provides a solid electrolyte membrane, its preparation method and battery containing it. The solid electrolyte membrane includes a base film and a first polyethylene oxide film laminated on one surface of the base film, and only the surface of the first polyethylene oxide film towards the outside includes -C 2 h 4‑x f x O‑structure, where x is an integer from 1‑4. The present invention improves the oxidation resistance of the electrolyte membrane and improves the battery life by performing fluorination treatment on the surface of the PEO membrane on the premise that the overall influence on the lithium ion transmission performance of the membrane is minimal; at the same time, the fluorination layer has a strong The bonding effect can improve the interface impedance of the electrolyte membrane-electrode sheet and improve the cycle performance of the battery.

The invention provides a functionalized polyolefin composite diaphragm and its preparation method and application. The functionalized polyolefin composite diaphragm of the present invention is composed of carbon nanotubes, lithium salts, inorganic nano-silicon dioxide and polyolefin components. The invention provides The preparation method of the composite separator is as follows: the binder and the solution of functionalized carbon nanotubes are mixed with nano-silica to obtain a coating solution, and then the polyolefin separator is placed in an ethanol solution of lithium salt to obtain a lithium salt-modified polyolefin membrane. Olefin separator, and then the coating solution is evenly coated on the lithium salt modified polyolefin separator, and then after vacuum drying, functionalized carbon nanotubes and lithium salt coated polyolefin separator are obtained. The prepared separator has excellent mechanical properties Strength, high stability, high active surface area, good electrolyte wettability, excellent lithium ion conductivity and electrochemical performance, can be well used in the field of lithium ion batteries.

The application provides a method for preparing a solid electrolyte, comprising: dispersing a lithium precursor and a central atom ligand in an organic solvent to form a reaction mixture; dispersing a borate ester in an organic solvent to form a modified solution; The initial reaction mixture is mixed with the modified solution, and dried to obtain an initial product; the initial product is ground, cold-pressed, and heat-treated to obtain a solid electrolyte. In the preparation method provided in this application, the sulfide solid electrolyte is modified with boric acid ester as the doping raw material, and a B and O co-doped sulfide solid electrolyte can be obtained. During the doping modification process , to realize the sufficient mixing between the sulfide electrolyte raw material and the borate; and the borate is completely decomposed at the phase-forming temperature of the sulfide electrolyte, reducing the introduction of impurities or reactant residues, and the prepared sulfide solid electrolyte The ionic conductivity of the battery has been significantly improved, which is also conducive to the energy density of the all-solid-state battery.