41results about How to "High ion transfer number" patented technology

The invention discloses a biomass nanofiber membrane, its preparation method and application. The biomass nanofiber membrane includes a biomass nanofiber film layer with a dense structure, which is made of biomass nanofibers chemically modified with cyano groups. become. In the present invention, due to the modification of the cyano group, the surface of the biomass nanofiber membrane can combine with the liquid electrolyte to form a gel state, through which lithium ions can be transported, so that the transmission of lithium ions does not depend on the strength of the membrane. aperture. The biomass nanofiber separator provided by the invention has good compactness, high ion conductivity, good electrolyte wettability and high ion transfer number. The present invention avoids the complicated steps that the biomass nanofiber separator needs to achieve high porosity by forming pores to improve the lithium ion conductivity of the separator. The biomass nanofiber separator provided by the application has good mechanical properties and realizes a dense bio The material nanofiber separator also has a breakthrough in excellent electrochemical performance.

The invention discloses a preparation method of a solid polymer electrolyte and its application in a secondary battery, by injecting an ethylenic monomer containing a boron heterocycle and an ethylenic carbonate polymer monomer, a metal salt and After the precursor solution of the initiator is prepared, it is obtained by performing in-situ polymerization reaction by means of heat and microwave. The ester group, ether oxygen and boron-containing functional groups in the solid polymer electrolyte prepared by the present invention can have a strong interaction with the alkali metal salt, which improves the microscopic movement of the chain segment, the dissociation degree of the alkali metal salt and the incompatibility of ions in the electrolyte. Evenly distributed, high ionic conductivity and ion migration number are obtained. At the same time, the in-situ polymerization method improves the compatibility and stability of the electrolyte / electrode heterogeneous interface, and has a good protective effect on negative electrode materials. It can be applied to many Scale flexible energy storage devices and achieve superior cycle stability and high safety.

The invention relates to a lithium battery diaphragm and a preparation method thereof. The lithium battery diaphragm comprises a porous polyolefin-based film and a core-shell structure inorganic oxidecoating layer, wherein the battery diaphragm and preparation method thereof is arranged on a surface of the porous polyolefin-based film, a coating material of the battery diaphragm and preparation method thereof is core-shell structure inorganic oxide particle, and the core-shell structure inorganic oxide particle comprises submicron inorganic oxide core and a nanometer inorganic oxide shell layer.

The invention relates to preparation and application of an organic-inorganic composite solid-state electrolyte, and relates to the technical field of a lithium ion battery electrolyte. The organic-inorganic composite solid-state electrolyte is prepared by selecting an isocyanate compound having rigid characteristic, a flexible chain segment compound capable of complexing and dissociating with lithium ions, inorganic nanoparticles, a conductive lithium salt and an organic solvent and adding a tin catalyst for crosslinking and curing. With the isocyanate compound, the mechanical property and thethermal stability of the composite solid-state electrolyte can be improved; by the flexible chain segment compound and the inorganic nanoparticles, the ion conductivity, the ion transfer number and the wide electrochemical window of the composite solid-state electrolyte can be improved, the charge-discharge performance of the lithium ion battery is improved, and the interface contact of the solid-state lithium ion battery is improved; and the organic-inorganic composite solid-state electrolyte has the advantages of excellent interface stability, wide electrochemical window, wide working temperature range, high ion conductivity and versatile shapes and is applicable to a lithium ion polymer battery.

The invention belongs to the solid electrolyte field, and provides an all-solid electrolyte which includes a polycaprolactone-based block copolymer, a lithium salt and a porous rigid material membrane, and the mass ratio of the polycaprolactone-based block copolymer and the lithium salt is (50-90): (10-50). As can be seen from the result of the example, the ionic conductivity of the all-solid electrolyte is 1.2x10<-5>-4.3x10<-4>S / cm, the electrochemical window reaches 4.5 ~ 5V and the lithium ion migration number reaches 0.4 ~ 0.6. The invention also provides a preparation method of the all-solid electrolyte. The preparation method of the invention has the advantages of simple operation, strong practicability and easy implementation. The invention also provides a lithium battery comprisingthe all-solid electrolyte or the all-solid electrolyte obtained by the preparation method.

The invention discloses a polycaprolactone-based hyperbranched polymer and a preparation method thereof. The polycaprolactone-based hyperbranched polymer comprises a polycaprolactone base and a polycaprolactone base linked by a covalent bond. A branched segment, the branched segment includes at least one of polystyrene, polyvinylcyclohexane, polymethyl acrylate and polymethyl methacrylate. The invention also discloses an all-solid electrolyte containing the polycaprolactone-based hyperbranched polymer, a preparation method thereof and a lithium ion battery containing the all-solid electrolyte. The polycaprolactone-based hyperbranched polymer of the present invention has good mechanical strength, and has high ion conductivity, ion transfer number and wide electrochemical window as an electrolyte, and the all-solid electrolyte of the present invention prepared by it can be used at high temperature Under stable cycle, the corresponding lithium-ion battery can still achieve stable performance at high temperature, increasing the service temperature of lithium-ion battery products.

The invention discloses a lithium ion battery composite electrolyte and a lithium ion battery. The lithium ion battery composite electrolyte comprises 50-90 parts by mass of an ionic liquid, 1-10 parts of a film forming additive, and 5-20 parts of a lithium salt. The lithium ion battery prepared through using the lithium ion battery electrolyte has the advantages of high conductivity, good cycle performances, large rate charge and discharge specific capacity, wide use temperature range, and excellent safety.

The invention provides a polymer electrolyte membrane for lithium ion batteries, the electrolyte membrane is based on oligoether-grafted polyphosphazene polymer, and includes an appropriate amount of lithium salt and oligoether-grafted polyphosphazene Doped small-sized inorganic fillers introduced into polymers. The present invention also provides a method for preparing a polymer electrolyte membrane, the method comprising: dissolving an oligoether grafted polyphosphazene polymer (MEEEP) in a solvent, and preparing a base material with a concentration of 2% to 15% by mass solution; disperse the inorganic filler doped with lithium salt and fast ion conductor (Li1.3Al0.3Ti1.7(PO4)3) into the matrix material solution to obtain the dispersed solution; cast the dispersed solution on the diaphragm to form a film and vacuum drying to obtain the oligoether grafted polyphosphazene-based polymer electrolyte membrane. Using the method provided by the invention to prepare the polymer electrolyte membrane improves the lithium ion conductivity and lithium ion migration number of the polymer electrolyte membrane, and improves the electrochemical and safety performance of the lithium ion battery.

The invention relates to a solid electrolyte, a preparation method thereof and a lithium secondary solid state battery, belonging to the technical field of secondary batteries. The technical problem solved by the invention is to provide a low-cost solid electrolyte. The solid electrolyte includes a polymer substrate, a lithium salt and an additive, wherein the additive is Ta-doped β-LiAlSi 2 o 6 . The use of new inorganic solid electrolyte additives improves the ionic conductivity of the solid electrolyte, and at the same time inhibits the growth of lithium dendrites, increases the energy density of the battery, and ultimately improves the cycle and rate performance of the battery. The solid electrolyte also has excellent ionic conductivity, high ion transfer number, and good cycle performance and rate performance at room temperature. Moreover, the preparation process is simple, the solid electrolyte slurry can be well mixed in a short time, the production efficiency is high, and the production cost is low.

The invention relates to the technical field of high-molecular material, and particularly relates to a coordinated branched butadiene-acrylonitrile rubber polymer and a preparation method thereof; the polymer is obtained by carrying out a reaction of a boron based compound with butadiene-acrylonitrile rubber. Compared with the prior art, the coordinated branched butadiene-acrylonitrile rubber polymer can better promote migration of lithium ions and has relatively high ionic conductivity and ionic transference number, and thus the polymer can be used for preparation of solid polymer electrolytes of lithium ion batteries, and better meets use requirements of the lithium ion batteries.

The invention belongs to the technical field of electrolytes for alkali metal batteries, and specifically discloses a two-dimensional nanostructure electrolyte additive, a preparation method and an application. The two-dimensional nanostructure electrolyte additive is a two-dimensional structure organic or inorganic nanosheet, and the two-dimensional nanostructure material is boron nitride nanosheet, graphene oxide, transition metal sulfide nanosheet, two-dimensional metal organic framework material, One or more of two-dimensional covalent organic framework materials, the thickness of which is not greater than 10 nanometers. The method includes peeling organic or inorganic bulk materials into two-dimensional nanosheets with a thickness of less than 10 nanometers, adding them into deionized water to disperse evenly, and freeze-drying to obtain a two-dimensional nanostructure electrolyte additive. The electrolyte includes electrolyte salt, non-aqueous organic solvent, and the above-mentioned two-dimensional nanostructure electrolyte additive. The invention can improve the long-term cycle stability and safety of the battery.