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

The invention discloses a montmorillonite-based composite solid electrolyte and a solid-state lithium battery. The montmorillonite-based composite solid electrolyte comprises a lithium montmorilloniteinorganic single-ion conductor, a polymer with lithium ion transport ability, a lithium salt, a high-voltage-resistant organic additive and polytetrafluoroethylene with high adhesion property, The montmorillonite-based composite solid electrolyte takes lithium montmorillonite inorganic single ionic conductor as an electrolyte matrix, and the lithium montmorillonite inorganic single ionic conductor has high ion migration number, wide voltage window and high thermal stability. The montmorillonite-based composite solid electrolyte has high room temperature ionic conductivity () 10-4S cm-1), widevoltage window (4.2-5.5 V) and high ion migration numb () 0.5. That solid-state lithium battery assembled by the montmorillonite composite solid electrolyte of the invention has excellent cycle stability.

The invention provides a copper current collector for a lithium metal secondary battery, comprising a copper foil and a polymer layer introduced on the surface of the copper foil, wherein the polymerlayer is a functional polymer with one or several groups of cyan, hydroxyl, amino, aldehyde group and carboxyl; inorganic nanoparticles are dispersed in the polymer layer; the inorganic nanoparticlesare one or several of alkylated alumina nanoparticles, nano silica, nano calcium carbonate, nano calcium phosphate, and iron oxide nanoparticles; and the inorganic nanoparticles have a mass fraction in the polymer layer of 0-5 percent. The invention introduces a functional polymer layer on the surface of the copper current collector, and the polymer layer may change the current density and stabilize the deposition of the metal lithium, thereby inhibiting the generation of lithium dendrites, stabilizing the SEI film, and improving the efficiency and safety of the lithium metal battery. The invention also provides a method for preparing a copper current collector for a lithium metal secondary battery and the lithium metal secondary battery.

The present invention relates to the preparation process of electrolyte for polymer lithium ion cell. The present invention uses micron level TiO2 powder as stuffing for polymer electrolyte film, and prepares PVDF-HFP base polymer electrolyte film via phase transfer process. In the weight ratio of PVDF-HFP to TiO2 in 9-49, weight ratio of PVDF-HFP to deionized water to acetone in 1 to 0.25-1.25 to 5-15, the mixture of solvent and non-solvent is added into the mixture of polymer matrix PVDF-HFP and micron stuffing TiO2 to obtain while homogeneous porous polymer film, which is then soaked in electrolyte liquid for lithium ion cell to obtain electrolyte film with ionic conducting performance and finally heat treated. The present invention has improved and stabilized pore structure of polymer electrolyte film and raised electrochemical performance and mechanical performance of electrolyte film.

The invention relates to a solid electrolyte and a preparation method thereof, and a lithium secondary solid-state battery, belongs to the technical field of secondary batteries and solves a technicalproblem to provide a low-cost solid electrolyte. The solid electrolyte comprises a polymer base material, lithium salt and additive, wherein the additive is Ta-doped beta-LiAlSi2O6. By adopting the novel inorganic solid electrolyte additive, ionic conductivity of the solid electrolyte is improved, meanwhile, growth of lithium dendrites can be inhibited, energy density of the battery is improved,and finally, cycle performance and the rate capability of the battery are improved. The solid electrolyte further has ion conductivity, high ion mobility and good cycle performance and rate capabilityat room temperature. The preparation process is simple, the solid electrolyte slurry can be well mixed in a short time, production efficiency is high, and manufacturing cost is low.

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 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 provides a polymer electrolyte membrane for lithium ion batteries. The polymer electrolyte membrane adopts low-polyether-grafted polyphosphazene polymer as the base material and comprises appropriate amount of lithium salt and doping type small-size inorganic filler introduced to the low-polyether-grafted polyphosphazene polymer. The invention further provides a method for preparing the polymer electrolyte membrane. The method comprises the following steps: dissolving the poly[bis2-(2-(2-methoxyethoxy)ethoxy)ethoxyphosphazene] (MEEEP) into a solvent to prepare a base material solution with the mass percent concentration being 2-15%, dispersing the inorganic filler doped with the lithium salt and a fast ion conductor into the base material solution to obtain the dispersed solution, pouring the dispersed solution on the membrane to form a membrane in a curtain coating manner, and performing vacuum drying to obtain the MEEEP electrolyte membrane. With adoption of the method for preparing the MEEEP electrolyte membrane, the lithium-ion conductivity and the lithium-ion transference number of the MEEEP electrolyte membrane are improved, and the electrochemistry and safety performance of the lithium ion batteries are improved.

The invention discloses an in-situ polymerization polycaprolactone-based all-solid-state electrolyte as well as a preparation method and application thereof. The method comprises the following steps of adding lithium salt and inorganic additive particles into methoxy polycaprolactone acrylate to obtain a mixed solution; adding a photoinitiator into the mixed solution, and uniformly mixing to obtain a mixture; and coating a pole piece with the mixture in an inert atmosphere, and carrying out in-situ polymerization reaction under the irradiation of an ultraviolet lamp to obtain the in-situ polymerization polycaprolactone-based all-solid-state electrolyte. The branched structure of the all-solid-state electrolyte is compounded with the polymer material particles, so that the all-solid-state electrolyte has high mechanical strength, high ionic conductivity, high ionic migration number and wide electrochemical window, and has certain biodegradability. According to the all-solid-state electrolyte, an in-situ polymerization preparation method is adopted, the pole piece is directly coated with a precursor, and the free radical polymerization is carried out under the initiation of the ultraviolet light to obtain the solid-state electrolyte, so that the technological conditions are simple, the high efficiency and convenience are achieved, the solvation is avoided, and no pollution is caused to the environment.

The invention relates to a solid electrolyte as well as a preparation method and application thereof, and mainly solves the problems of low mechanical strength and low conductivity of the existing solid electrolyte and the problems of complexity, long time consumption and difficulty in large-scale production of the existing solid electrolyte preparation method. According to the solid-state electrolyte, nanoparticles grow on a substrate skeleton, and then the electrolyte is fixed, so that the interface contact between metal lithium and the electrolyte is effectively improved, the ionic conductivity and the ionic migration number are improved, the uniform deposition and separation of lithium ions on the metal lithium are promoted, and the solid-state electrolyte can be widely applied to solid-state batteries.

The invention relates to gel containing ester compounds and sulfides as well as preparation and application of the gel, and belongs to the technical field of gel electrolytes. The gel is prepared from, by mass, 50%-80% of ester compounds, 2%-40% of salt compounds, 2%-45% of sulfur and 1%-20% of metal sulfide, the room-temperature ionic conductivity of the gel is 1.0*10<2> S/cm or above, the room-temperature ionic migration number of the gel is 0.6 or above, and the gel further has a wide electrochemical window. The electrolyte can be applied to a secondary ion battery; the preparation method of the gel is simple, short in preparation period and easy for industrial production.

The invention discloses preparation and application of an ultrathin organic-inorganic composite solid electrolyte membrane, and belongs to the technical field of lithium ion battery electrolyte. The preparation method comprises the following steps: firstly, selecting a high-molecular polymer and highly dispersed inorganic nanoparticles, preparing a thickness-controllable ultrathin composite electrolyte self-supporting base membrane by a tape casting method, and then selecting a carbonate-based polymer electrolyte with high ionic conductivity, and preparing the ultrathin organic-inorganic composite electrolyte membrane by a solution pouring method. The thickness of the prepared ultrathin organic-inorganic composite electrolyte membrane can be reduced to be less than 10 microns, and meanwhile, the ultrathin organic-inorganic composite electrolyte membrane has high ionic conductivity, a wide electrochemical stable window and excellent mechanical properties. The preparation process is simple, is convenient for large-scale production, and is suitable for commercial lithium ion solid-state batteries.

The invention relates to a multi-component solid electrolyte and a preparation method and application thereof. The preparation method of the solid electrolyte comprises the following steps: 1) selecting at least two polymers and solvents matched with the polymers; 2) adding the polymers and an alkali metal salt into the solvent in the step 1), and performing uniformly mixing to obtain a mixed solution; and 3) drying the mixed solution in the step 2) to obtain a multi-component solid electrolyte. The multi-component solid electrolyte is used in a lithium ion battery or a sodium ion battery. Compared with the prior art, according to the invention, blending of two or more than two polymers which are incompatible originally can be realized, and uniform blending of any polymer can be realized by using the method disclosed by the invention, so that the function of the mixed polymer is designed through component design, and the prepared solid electrolyte simultaneously meets the requirementsof high ionic conductivity, high ionic migration number, high mechanical strength and high high-temperature resistance.

The invention belongs to the technical field of lithium ion battery electrolytes, and discloses a poly (1, 5-dioxepane-2-ketone)-based block polymer as well as a preparation method and application thereof. The poly (1, 5-dioxepane-2-ketone)-based block polymer is abbreviated as a PDXO-based block polymer, and the structure of the block polymer is shown as a formula (1), wherein R is shown in the specification, n = 1-500, m = 1-500, and x = 1-3. The synthesis process of the poly (1, 5-dioxepane-2-ketone)-based block polymer is convenient and feasible, and the prepared polymer has good interface stability, wide electrochemical window (greater than 4.5 V) and high room-temperature ionic conductivity (greater than 10 <-5 > Scm <-1 >) when being used as a lithium ion battery polyelectrolyte.