30results about How to "Improve ion conduction ability" patented technology

The invention relates to a multi-element gradient composite high-first-effect lithium battery negative electrode material and a preparation method thereof. The negative electrode material is of a multi-layer core-shell structure, and comprises an inner core, a buffer layer and an outer layer. The inner core and the buffer layer of the negative electrode material are silicon-oxygen compounds, and the outer layer is a carbon coating layer. The inner core and the buffer layer further contain lithium salt and magnesium salt, and the concentration of the magnesium salt is increased progressively from the inner core to the buffer layer to form gradient distribution. There is more lithium salt in the core of the negative electrode material, so that a large amount of active oxygen can be consumed,the initial coulombic efficiency of the material is effectively improved, and meanwhile, the ion conductivity of the material is improved. There is more magnesium silicate in the buffer layer, so that the initial charge-discharge efficiency of the material is further improved, meanwhile, the magnesium silicate forms a high-strength protective layer, the structural stability of the material is enhanced, and the cycle performance of the material is improved.

The invention relates to a preparation method of a high-stability artificial solid electrolyte interface film material, belonging to the technical field of lithium batteries. The technical scheme of the present invention adopts the ion beam deposition method to improve the problems of large leakage current, large dielectric loss and easy breakdown during pulse polarization when the traditional sol-gel is used to prepare lithium tantalate composite thin film materials. In order to reduce the dielectric loss and Leakage current, enhance the ability to resist breakdown, through the ion beam enhanced deposition method lithium tantalate thin film, form a complex film structure with lithium ions, prevent its precipitation, and slow down the "shuttle effect", while the deposited thin film composite prepared by the present invention It is non-corrosive and compatible with all battery components. The purification film is formed by depositing the dense structure of the film itself. This compound has high ion conductivity, which improves the cycle performance of lithium batteries and improves the use of materials. life.

The invention discloses a conductive composite material, a preparation method thereof and application of the conductive composite material in a lithium ion battery electrode. The composite material comprises a hollow conductive polymer tube and a conductive agent, the conductive agent is uniformly dispersed in the conductive polymer tube in an incomplete filling manner, and the inner diameter of the conductive polymer tube is 100-4000 nm. The preparation method comprises the following steps: carrying out electrostatic spinning on an electrostatic spinning solution containing a high-molecular polymer and a conductive agent to obtain nanofibers, dispersing the nanofibers into a hydrochloric acid solution containing a conductive polymer monomer, adding an initiator to carry out polymerization reaction to obtain the nanofibers coated with the conductive polymer on the surface, finally adding the nanofibers into an organic solvent, and fully dissolving the high-molecular polymer in the nanofibers to obtain the conductive composite material. The conductive composite material has good conductivity and ion conductivity at the same time, and when the conductive composite material is used as a conductive agent in an electrode, the polarization phenomenon under the large-current charging and discharging condition can be effectively eliminated, battery expansion is relieved, and the rate performance and the cycle performance are improved.

The invention relates to the technical field of lithium ion batteries, and discloses a conductive agent, a preparation method thereof, an electrode material and a secondary battery. The conductive agent provided by the invention includes: sulfonated graphene metal salt and carbon nanotubes, and the sulfonated graphene metal salt and carbon nanotubes are combined to form a line-plane conductive network. The conductive agent has dual effects of electron conduction and ion conduction. When it is applied to the preparation of batteries, it can optimize the electron conduction and ion conduction in the battery, and improve the rate performance, cycle performance and low temperature performance of the secondary battery.

The invention provides an electrode material of a nanometer porous film capacitor and a preparation method thereof. The method comprises the following steps of: taking nanometer porous gold as a substrate material, putting the nanometer porous gold into a plating solution with nickel nitrate as a main component, and loading nickel on a nanometer porous gold surface by using a chemical plating method; and keeping the nanometer porous gold loaded with the nickel in the air for a certain time. The nanometer porous gold is taken as a substrate, and the metal Ni is modified on the surface of the nanometer porous gold by the interface chemical plating method. The Ni is contacted with oxygen in the air to form NiO, and a nanometer porous nickel oxide film material is obtained. SEM and EDS tests show that the prepared NiO material keeps the porous structure of the substrate and improves the electrical conductivity and ion conductivity of the electrode material. The prepared porous nickel oxide is good super capacitor electrode material with exploitation potential.

The present application provides a Prussian blue cathode material, a preparation method thereof, and an electrochemical energy storage device. The molecular formula of the Prussian blue cathode material is A x M c [M'(CN) 6 ] y , where A is H + , Li + , Na + , K + , NH 4 + One or more of them, M is a transition metal, M' is a transition metal, 0

The invention belongs to the technical field of lithium ion secondary batteries and particularly relates to a preparation method of a lithium ion secondary battery anode material. The preparation method of the lithium ion secondary battery anode material comprises the following steps of: firstly dissolving a non-stoichiometric anode active substance and a graphenization catalyst into water, then carrying out spray drying so as to obtain mixture granules; placing the mixture granules and an organic solvent into a reaction container, scattering, filtering, washing, and drying in vacuum, thus obtaining carburization anode active substance powder; sintering the anode active substance powder in an inert gas or reducing gas atmosphere so that the graphenization catalyst and the non-stoichiometric anode active substance are melted into crystals so as to coat a graphene layer on the surface of the anode active substance. Compared with the prior art, the preparation method has the advantages that the electron conduction property of the anode material is improved since the graphene layer with a high electron conduction property is coated on the surface of the anode active substance and further a battery made of the material has a excellent multiplying power performance and circulation performance and higher capacity.

The invention discloses a conductive composite material, a preparation method thereof and an application in a lithium ion battery electrode. The composite material includes a hollow conductive polymer tube and a conductive material, the conductive material is uniformly dispersed inside the conductive polymer tube in an incomplete filling manner, and the inner diameter of the conductive polymer tube is 100-4000 nm. Its preparation: electrospinning an electrospinning solution containing a high molecular polymer and a conductive material to obtain nanofibers, then dispersing into a hydrochloric acid solution containing a conductive polymer monomer, adding an initiator to carry out a polymerization reaction, and obtaining a surface coating The nanofibers coated with the conductive polymer are finally added into an organic solvent to fully dissolve the high molecular polymers in the nanofibers, so as to obtain a conductive composite material. The conductive composite material has good electrical conductivity and ion-conducting properties at the same time. When used as a conductive agent in electrodes, it can effectively eliminate the polarization phenomenon under high current charge and discharge conditions, relieve battery swelling, and improve rate performance and cycle performance.

The invention relates to a nickel-cobalt-lithium-aluminate cathode material coated with lanthanum lithium titanate-lithium titanate and a preparation method thereof. The preparation method includes the following steps: S1: dissolving the organic titanium source and the lanthanum source in an organic solvent, and stirring to obtain a mixed solution; S2: adding nickel-cobalt lithium aluminate and a surfactant to the mixed solution, and stirring at 60-80°C to obtain a suspension; S3: add water drop by drop under stirring conditions, continue to stir until the organic solvent is completely volatilized, and dry to obtain the coating material; S4: calcining the coating material at 450-650 °C for 5-10 h to obtain Nickel-cobalt-lithium-aluminate cathode material coated with lanthanum lithium titanate-lithium titanate. The preparation method provided by the present invention is simple to operate, easy to industrialize, and is suitable for popularization and use in this field; the prepared nickel-cobalt-lithium-aluminate cathode material coated with lithium titanate-lanthanum titanate has excellent electrochemical performance and cycle stability.

The invention provides a gel polymer electrolyte diaphragm, a lithium ion battery and a preparation method thereof. The preparation method of the diaphragm comprises the following steps: dissolving apolymer micro powder in a first solvent to obtain a polymer solution; dissolving the stabilizer in the second solvent to obtain a stabilizer solution; Mixing the high molecular polymer solution and the stabilizer solution and diluting to prepare polymer electrolyte slurry; The polymer electrolyte slurry is coated on at least one surface of a diaphragm substrate, and dried to form a polymer electrolyte coating to obtain a gel polymer electrolyte diaphragm. The gel polymer electrolyte diaphragm made of the aqueous polymer has the characteristics of high adhesion, environmental protection, strongliquid absorption and high ionic conductivity, and can greatly save cost. The lithium ion battery is prepared by utilizing the separator of the invention, and polymer gel is formed through a gelatinization process, and the electrolyte is tightly locked in the polymer gel, and the lithium ion is used as a channel for directional movement.

The invention provides a binder for a lithium-ion battery separator coating and a preparation method thereof. The binder for a lithium-ion battery separator coating mainly includes the following components in parts by weight: 6-33 parts of acrylonitrile 16-30 parts of acrylic acid; 1-5 parts of soft monomer; 0.1-5 parts of emulsifier, 0.1-2 parts of initiator, 0.1-5 parts of lithium salt, 30-70 parts of ultrapure water; its preparation method is in emulsification Add ultrapure water and emulsifier into the tank, stir evenly, add all the monomers, and get a pre-emulsion after stirring; add the remaining ultrapure water and pre-emulsion into the reaction kettle, stir and heat up to 60-100°C, add dropwise Initiator aqueous solution, react, keep constant temperature for 4-8h, cool to normal temperature, adjust pH value. The application solves the problem that the diaphragm coating of the lithium-ion battery is not resistant to high temperature and the water content is too high, improves the conductivity of ions, and improves the safety performance of the battery.

The invention discloses a ternary positive electrode material coated with lithium phosphate and a conductive carbon material, comprising a ternary positive electrode material, a conductive carbon material adsorbed and inserted into the surface of the ternary positive electrode material, and lithium phosphate coated on the surface of the ternary positive electrode material layer, the preparation method of which is: dissolving phosphoric acid in a solvent, ultrasonic dispersion at room temperature and continuous stirring, then adding the mixed powder of ternary positive electrode material and conductive carbon material to the solution being stirred, and continuously stirring and reacting; finally, the above-mentioned The mixed solution is heated to remove the solvent, and a ternary positive electrode material coated with lithium phosphate and conductive carbon material is obtained. The present invention covers the surface layer of the conductive carbon material to form a uniform and continuous complete coating layer, which can effectively reduce the internal resistance at the interface of the material and improve the electronic conductivity of the material to a certain extent; at the same time, phosphoric acid is generated by chemical method Lithium provides lithium ion channels for the transmission of lithium ions, thereby improving the ionic conductivity of the material; moreover, the coating layer can effectively prevent the electrolyte from corroding the material, thereby greatly improving the cycle stability of the material.

The invention discloses a boron nitride nanotube / silicon / carbon nanotube composite material, which comprises a silicon material, a boron nitride nanotube and a carbon nanotube, wherein the content of the silicon material is 10-90 wt%, and the boron nitride nanotube The sum of the content of carbon nanotubes and carbon nanotubes is 10-90wt%; the invention also discloses the preparation method of the boron nitride nanotube / silicon / carbon nanotube composite material and its application in the preparation of negative electrode materials for lithium-ion batteries; the invention Among them, due to the good high temperature resistance and oxidation resistance of boron nitride nanotubes, it can be used as a structural support and part of the nano-silicon can be embedded in the modified boron nitride nanotubes to alleviate the volume change of silicon particles during charging and discharging. , while carbon nanotubes have good electronic conductivity and ionic conductivity, the boron nitride nanotube / silicon / carbon nanotube composite material can exert the excellent electrochemical performance of silicon-based negative electrode while overcoming the shortcomings of silicon-based negative electrode materials, It can be widely used in negative electrode materials of lithium ion batteries.

The invention relates to a multi-component composite high-first-efficiency lithium battery negative electrode material and a preparation method thereof. The negative electrode material is co-doped with Li and Mg to form SiO x ‑Lithium silicate‑magnesium silicate multiple composite system. The negative electrode material includes silicon compound particles and a conductive layer coated on the surface of the silicon compound particles, the negative electrode material also includes lithium silicate, magnesium silicate, lithium atoms in the lithium silicate and the magnesium silicon The molar ratio of magnesium atoms in the acid salt is 0.01:1~100:1. The invention combines the characteristics of the high ion conductivity of the lithium silicate and the high bonding strength of the magnesium silicate, further improves the first coulombic efficiency of the material and improves the cycle life at the same time.

The invention provides a ternary positive electrode material for a lithium ion secondary battery and a preparation method thereof. The method of the invention can improve the electronic conductivity and ionic conductivity of the ternary positive electrode material for a lithium ion secondary battery under low temperature conditions, thereby improving the ternary positive electrode material. Low temperature output characteristics of cathode materials. The preparation method includes the following steps: 1) adding a metal oxide to a ternary precursor A with a median particle size of 3-5 μm and adding a lithium source to obtain a material A; adding a ternary precursor A with a median particle size of 8-12 μm Add a metal oxide to the precursor B and add a lithium source to obtain a material B; sinter to obtain a calcined material A and B; 2) respectively add it to the gelatin aqueous solution, stir and dry to obtain a gel A and a gel B; 3) freeze the The dried gels A and B are calcined to obtain secondary sintered materials A and B coated with conductive carbons of different coating amounts; 4) batch mixing of secondary sintered materials A and B to obtain lithium ion secondary battery III Element cathode material.

The invention provides a battery separator, a preparation method thereof, and a lithium ion battery containing the battery separator. The material of the battery separator includes at least one ionic liquid polymer shown in formula (1)-formula (3), and the separator is easily The preparation and strong Li+ ion conductivity can improve the rate performance and cycle performance of the battery, and at the same time improve the safety performance of the battery.