4results about How to "Guaranteed ionic conductivity" patented technology

The application relates to the technical field of lithium battery diaphragm, in particular to a high-stability lithium battery diaphragm and a preparation method thereof. The high-stability lithium battery diaphragm is prepared by the following steps: after a polypropylene film is irradiated by ozone and ultraviolet light in sequence, pre-deposition and pre-grafting are carried out on the surface of the polypropylene film, and then ultraviolet radiation treatment is carried out. The application realizes synergistic effect of nano-enhancement and self-repairing, solves the stability problem of traditional PP diaphragms in long-term cycles, and provides a reliable diaphragm solution for high-energy-density lithium batteries.

The invention provides a preparation method of a solid electrolyte membrane. The preparation method of the solid electrolyte membrane comprises the following steps: crushing and screening electrolyte raw materials to obtain electrolyte particles; dissolving the electrolyte particles into a solvent, and uniformly mixing to obtain electrolyte slurry; carrying out refining treatment on the electrolyte slurry to obtain refined powder; and carrying out rolling treatment on the refined powder to obtain the solid electrolyte membrane. According to the preparation method of the solid electrolyte membrane, the preparation process is simplified, the production cost is reduced, and the production efficiency is improved. The electrolyte slurry is refined by optimizing the process conditions for preparing the electrolyte powder, so that the ionic conduction performance and the stability of the electrolyte membrane are ensured; and meanwhile, the preparation process is green and environment-friendly and has huge industrial application potential.

The invention discloses a fluorine-rich acrylate polymer material as well as a preparation method and application thereof, and relates to the technical field of new energy. According to the invention, methyl methacrylate is used as a skeleton, a fluorine-containing polymer monomer is used as a functional monomer, and a fluorine-rich acrylate polymer material is generated through a copolymerization reaction. While the characteristic that methyl methacrylate can be dissolved in an electrolyte is reserved, the hydrophobicity of a polymer is improved by introducing a fluorine-containing monomer, and the polymer is loaded on the surface of a pre-lithiated electrode through a spraying means, so that the environmental stability of the pre-lithiated electrode is improved. Compared with other conventional pre-lithiation electrode protection work, the polymer design scheme for pre-lithiation electrode protection has the advantages that lithium ion transmission and pre-lithiation performance are not affected, excellent environmental stability can be realized, the polymer design scheme is adaptive to an industrial production process, and meanwhile, the cost is reduced.

The invention discloses an in-situ cured solid electrolyte, a lithium ion battery and a preparation method thereof, the in-situ cured solid electrolyte is prepared by curing the following raw materials: a polymer monomer, a lithium salt, a deep eutectic electrolyte and an initiator, and the mass ratio of the polymer monomer to the lithium salt to the deep eutectic electrolyte to the initiator is 1000: (5000-10): (9000-10): (1000-0.001); the polymer monomer is selected from one or more of acrylic acid, methacrylic acid, methyl methacrylate, pentaerythritol tetraacrylate, pentaerythritol triacrylate, acrylonitrile, ethylene carbonate, vinylene carbonate, ethylene oxide and 1, 3-dioxocyclopentane; the deep eutectic electrolyte comprises a deep eutectic lithium salt and a deep eutectic solvent. The high-safety deep eutectic electrolyte is used, the ionic conductivity and safety of the solid electrolyte are effectively guaranteed, in-situ curing and good interface contact between the positive electrode and the negative electrode are achieved, and the finally obtained lithium ion battery shows high capacity and excellent room-temperature cycling stability.