3results about How to "Improve interface impedance" patented technology

The invention relates to the technical field of batteries, in particular to a positive electrode material, a preparation method and application thereof and an all-solid-state battery. The positive electrode material comprises an inner core and an outer core, wherein the inner core contains a nickel-rich ternary material; the interface modification layer is coated on at least part of the surface of the inner core, and the interface modification layer comprises lithium phosphorus oxide and metal sulfide. According to the positive electrode material, the interface impedance of the battery can be better reduced, the critical current density is improved, and the cycle life is prolonged.

This invention discloses a high-strength, heat-resistant lithium-ion battery separator and its preparation method, belonging to the field of lithium-ion battery technology. The separator is a multilayer composite structure, comprising: a rigid porous framework membrane prepared from a rigid polymer material via thermally induced phase separation as a support layer; and a functional layer composited on the surface of the support layer. The functional layer is a gel electrolyte separator formed from a covalent organic framework material via electrospinning, containing a hierarchical porous network of micropores, mesopores, and macropores, and a flame retardant dispersed in the pores of the separator. The preparation method includes: thermally induced phase separation after melt blending, biaxial stretching and extraction, electrospinning surface deposition, flame retardant introduction, and hot pressing. The separator of this invention, through the synergistic effect of the rigid framework and the COFs gel layer, possesses high mechanical strength, high heat resistance, high ionic conductivity, and thermal runaway management functions, effectively improving the safety and cycle stability of semi-solid-state lithium-ion batteries.

The invention discloses an interface coated solid-state electrolyte and a lithium ion solid-state battery, the interface coated solid-state electrolyte comprises a solid-state electrolyte and an LMF interface modification layer arranged on the surface of the solid-state electrolyte; the thickness of the LMF interface modification layer is smaller than or equal to 60 nm. Through the arrangement of the LMF interface modification layer with the thickness of less than or equal to 60nm, under the synergistic effect of Li-Mg alloy and LiF in the LMF interface modification layer, the contact resistance between lithium metal and the electrolyte is effectively improved, the impedance of the interface-coated solid electrolyte can be effectively reduced by adopting simple and low-cost raw materials and a preparation process, and the interface-coated solid electrolyte has the advantages of low cost and high efficiency. Further, the electrochemical performance of the prepared lithium ion solid-state battery is effectively improved.