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 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 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.