6 results about "Ionic conductance" patented technology

The present application relates to a kind of porous gel electrolyte membrane based on polyvinylidene fluoride and its preparation method, belong to polymer gel electrolyte field.The porous gel electrolyte membrane includes gel electrolyte matrix, inorganic ceramic nano filler, lithium salt electrolyte and lithium salt auxiliary agent.Using phase inversion solidification method, the uniform porous structure is obtained, the adsorption and storage capacity of porous gel electrolyte membrane to electrolyte are improved;Using inorganic ceramic nano filler with high ionic conductance, the ionic conductance and mechanical strength of porous gel electrolyte membrane are enhanced;Using lithium salt added during preparation, the dehydrofluorination reaction of PVdF is inhibited, the stability of slurry is ensured, and by inducing the transition of PVdF matrix from alpha phase to beta phase, the uniform deposition of Li ion is promoted, so as to improve the cycle stability of battery.The preparation method of the present application is simple, easy to control, green and environmentally friendly, can significantly improve the ion transport kinetics and electrochemical stability of lithium ion battery.

This invention discloses a composite solid-state electrolyte, its preparation method, and a battery. The composite solid-state electrolyte comprises a polymer matrix, a sulfide ceramic filler, a main lithium salt, and a nitrile-based lithium salt additive. The nitrile-based lithium salt additive forms an interfacial passivation layer on the surface of the sulfide ceramic filler to suppress interfacial side reactions between the sulfide ceramic filler and the polymer matrix and / or the main lithium salt. This invention maintains the structural integrity of the sulfide ceramic filler, preserving its inherent high ionic conductivity channels, while reducing the interfacial impedance between the organic and inorganic phases, thereby improving the ionic conductivity and interfacial stability of the composite solid-state electrolyte.

This invention provides a multifunctional halide material, its preparation method, and its application; the multifunctional halide material includes at least one of the following: (I) Li 2‑x M 1‑x A x Cl4;(II) Li 2‑x M' 1‑ x A x Cl4;(II)Li 2‑x M'' 1‑x A x Cl 4‑3x E 3x The multifunctional halide material of this invention possesses both high ionic conductivity and partially reversible delithiation capability, providing additional lithium ions to achieve a lithium replenishment effect.

This invention discloses a method for preparing a surface-passivated, highly stable sulfide electrolyte, comprising the following steps: S1: depositing an ion-conductive seed layer on the surface of sulfide electrolyte particles in an inert atmosphere; S2: coating the surface of the sulfide electrolyte particles with a dynamic passivation layer to obtain coated particles; the dynamic passivation layer forms an ion-conductive polymer layer with a gradient concentration by in-situ initiating a polymerization reaction of monomers containing reversible cross-linked structures on the seed layer, wherein the gradient concentration refers to the continuous increase of the molar fraction of ion-conductive groups along the layer thickness direction; S3: obtaining a surface-passivated, highly stable sulfide electrolyte through spheroidization post-treatment. The preparation method of this invention not only achieves physical-chemical dual shielding against moisture / air erosion, but also endows the particles with self-healing capabilities while simultaneously ensuring high ion conductivity and high mechanical toughness, meeting the stringent requirements of high energy density and long-life all-solid-state batteries.

The application discloses a kind of electrolyte preparation methods suitable for manganese zinc secondary battery, comprising the following steps: solvent premixing, deionized water, ACN, Py, DTA, EG are sequentially added and stirred;Batch dissolving salt, Zn (OTF) 2 is added in batches into reaction kettle, and clear transparent solution is obtained after dissolving;Surfactant cooperation, CTAB suspension is added into solution and stirred;Vacuum degassing, dissolved oxygen and trace volatile components in solution are removed by vacuum;Impurity is removed by filtering, the solution is filtered to meet metal ion impurities≤1ppm, and high reversibility electrolyte is obtained.The electrolyte can realize nearly 100% Zn plating / stripping coulomb efficiency without sacrificing safety and cost, and has no dendritic deposition, MnO2 positive electrode 1500 cycles or more high reversible capacity, effectively inhibits hydrogen evolution reaction and electrolyte dry, maintains low temperature long-term stable operation, and has low viscosity, high ionic conductivity and non-flammable characteristics.

This application provides a negative electrode sheet, its preparation method, and its application. The negative electrode sheet includes a current collector and a negative electrode active layer disposed on the surface of the current collector. The negative electrode active layer includes negative electrode active material particles and a modified inorganic ionic conductor. The modified inorganic ionic conductor includes an inorganic ionic conductor body and a carbon coating layer covering the surface of the inorganic ionic conductor body. The modified inorganic ionic conductor includes one or more of one-dimensional modified inorganic ionic conductor nanowires and two-dimensional modified inorganic ionic conductor nanosheets. The ionic conductivity of the negative electrode active layer gradually increases along the direction from the current collector to the negative electrode active layer. This negative electrode sheet possesses excellent ionic conductivity, electronic conductivity, and high energy density.