532results about How to "Improve Interface Stability" patented technology

The invention relates to solid-state electrolytes, in particular to a polycarbonate all-solid-state polymer electrolyte, an all-solid-state secondary lithium battery made of the same and preparation and application thereof. The all-solid-state polymer electrolyte is prepared from polycarbonate macromolecules, lithium salt and a porous supporting material; the thickness is 20-800 micrometers, the mechanical strength is 10-80 MPa, the room temperature ion conductivity is 2*10<-5>S/cm-1*10<-3>S/cm, and the electrochemical window is higher than 4V. The all-solid-state polymer electrolyte is easy to prepare and form, good in mechanical property, high in ion conductivity and wide in electrochemical window; meanwhile, the solid-state electrolyte effectively inhibits growth of negative electrode lithium dendrites and improves interface stability and long circulation performance.

A gas-detecting element comprising an oxygen-ion-conductive solid electrolyte substrate, a sensing electrode fixed onto said solid electrolyte substrate and active with a detection object gas and oxygen, and a reference electrode fixed onto said solid electrolyte substrate and active with at least oxygen, for detecting potential difference between the sensing electrode and the reference electrode to determine the concentration of the detection object gas, the sensing electrode and/or the reference electrode being covered by an electrode-coating layer made of an oxygen-ion-conductive solid electrolyte, and the electrode-coating layer having a portion bonded to the solid electrolyte substrate directly or via an electrode underlayer made of an oxygen-ion-conductive solid electrolyte.

The invention belongs to the field of electrochemistry and in particular relates to a ceramic membrane. Particularly, the invention also relates to a ceramic membrane with a core-shell structure and prepared by substituting an organic-inorganic composite for ceramic powder. The invention further relates to application of the ceramic membrane to a chemical power supply system such as a lithium ion battery and a battery comprising the ceramic membrane. The ceramic powder with the core-shell composite structure is favorable for improvement of the electrolyte adsorbing and maintaining ability of the ceramic membrane. The ceramic membrane can serve as a high-safety membrane material of secondary batteries such as a lithium ion battery, and has excellent electrochemical performance and heat stability. According to the invention, the operability is high; the cost is low compared with that of other methods; the reproducibility is high; and the obtained product quality is stable.

A semiconductor device has an MIS (metal-insulating film-semiconductor) structure, and a film mainly containing Al, O, and N atoms is used on a semiconductor. Alternatively, a semiconductor device has an MIS structure, and a film mainly containing Al, O, and N atoms is provided as a gate insulating film on a channel region between a source and a drain. Characteristics required of a gate insulating film of a 0.05 μm-gate-length-generation semiconductor transistor are satisfied. In particular, no fixed charge is included in the film, and impurity diffusion is reduced.

The invention discloses a dopamine-modifying ceramic composite separator and an application thereof. The dopamine-modifying ceramic composite separator comprises an organic separator base material and a ceramic layer arranged on the surface of the separator base material in a coated mode, wherein the thickness of the ceramic layer ranges from 0.1 micrometer to 20 micrometers. The dopamine-modifying ceramic composite separator further comprises dopamine polymers grown on the surfaces and the interiors of the separator base material and the ceramic layer in an in-situ mode. The dopamine polymers are copolymers of polydopamine or 5-hydroxy- polydopamine or polydopamine acrylamide and polydopamine acrylamide. The particle size of inorganic powder in the ceramic layer ranges from 5 nanometers to 10 micrometers. The molecular weight of materials of the organic separator base material ranges from 1,000 to 100,000,000. According to the dopamine-modifying ceramic composite separator, due to the dopamine polymers, potential safety hazards caused by powder falling and liquid leaking of the ceramic layer can be effectively reduced, and the physical performance and the electrochemical performance of the separator are effectively improved; meanwhile, due to the dopamine polymers, the stability of an interface between separator electrolysis and an electrode can be improved, lithium dendrites can be effectively suppressed through the improvement of the stability of the interface, and therefore the capacity holding capacity of a battery can be easily improved.

The invention relates to a method and system for preparing a particle-reinforced metal-based composite material through injection molding. Ceramic reinforced particles and high-pressure inert gas are uniformly mixed in an acceleration nozzle to be used as an atomizing medium, thereby improving the density, momentum and impact force of the atomizing medium, obviously enhancing the atomization effect and reducing the inert gas consumption as compared with the atomization based on the single use of inert gas. After atomization is completed, the ceramic particles are uniformly dispersed in atomized molten drops, and the molten metal drops doped with the reinforced particles are gradually solidified in the flying process and are ultimately deposited, solidified and molded on a receiver, thus obtaining the high-performance metal-based composite material of which the ceramic reinforced particles are uniformly distributed. In addition, the ceramic reinforcements used in the invention are prepared by a reaction and ball milling method, thereby ensuring that the reinforced particles better in strength, interface stability, high-temperature performance and other aspects can be prepared at a low cost.

The invention discloses an organic-inorganic composite solid electrolyte. The solid electrolyte is characterized by being prepared from an acrylate material, lithium salt, a crosslinking agent, an initiator, a plasticizer, a fast ionic conductor and a porous rigid support material. The preparation method of the inorganic composite solid electrolyte is characterized by comprising steps as follows:mixing the acrylate material with the lithium salt to completely dissolve the lithium salt in acrylate; adding the crosslinking agent and the plasticizer to the mixed solution, and stirring the mixture evenly; adding the fast ionic conductor to the mixed solution, and performing ultrasonic treatment or stirring to disperse the conductor uniformly; adding the initiator to the mixed solution, and performing stirring uniformly; uniformly pouring the mixed solution on the porous rigid support material; performing heating initiation at 60-100 DEG C to enable the acrylate material to be copolymerized with the crosslinking agent to obtain the organic-inorganic composite solid electrolyte. The solid electrolyte has the advantages that the preparation method is simple, the production efficiency ishigh, and the assembled solid lithium battery has lower impedance and higher capacity.

The invention discloses a lithium ion battery composite negative electrode material and a preparation method thereof. The surface of nanometer silicon is subjected to oxidization treatment to obtain nanometer silicon coated with silicon dioxide on the surface; the nanometer silicon coated with silicon dioxide on the surface is mixed with a lithium source uniformly to obtain a precursor; and the obtained precursor is placed into inert gas to be heated to obtain a nanometer silicon material coated with lithium silicate, and the product is subjected to washing, centrifugal separating and drying to obtain the lithium ion battery composite negative electrode material. By taking a uniform primary oxide layer on the surface of the nanometer silicon material as the substrate, an in-situ chemical reaction is performed to realize uniform coating of lithium silicate, so that stability between nanometer silicon and air or an electrolyte interface is improved effectively, thereby greatly improvingelectrochemical performance of the nanometer silicon material.

The invention discloses a composite solid-state polymer electrolyte and an all-solid-state lithium battery. The composite solid-state polymer electrolyte comprises organic micro-nano porous granules, a polymer having lithium ion conducting capability and a lithium salt; the composite solid-state polymer electrolyte takes the organic micro-nano porous granules as filler; and natural compatibility exists between the organic filler and the polymer matrix. The composite solid-state polymer electrolyte disclosed by the invention has high electrochemical window (4.2-5V), excellent interface stability with a lithium-based negative electrode material, and low interface impedance. The all-solid-state lithium battery, assembled by the composite solid-state polymer electrolyte disclosed by the invention, is high in cycling performance and rate capability.

The present invention provides a high-voltage lithium cobaltate positive electrode material, which is a compound structure of a doped lithium cobaltate substrate and a surface coating layer, wherein the general formula of the doped lithium cobaltate substrate is Li1+zCo1-x-yMaxMbyO2, x is more than or equal to 0 and is less than or equal to 0.01, y is more than or equal to 0 and is less than or equal to 0.01, z is more than or equal to -0.05 and is less than or equal to 0.08, Ma is a doped element with unchanged valence, and is at least one selected from Al, Ga, Hf, Mg, Sn, Zn and Zr, Mb is adoped valence-changing element, and is at least one selected from Ni, Mn, V, Mo, Nb, Cu, Fe, In, W and Cr, and the surface coating layer is a high-voltage (more than 4.5 V) positive electrode material. According to the present invention, the element with unchanged valence is doped through substitution, such that the layered structure distortion caused by lithium removing can be minimized; the valence-changing element is subjected to gap doping, such that the Co<3+> oxidation is blended and delayed during the charging; and the surface coating layer has the stable structure at the voltage of more than 4.5 V, can separate the electrolytic solution from the lithium cobaltate substrate, can reduce the side reaction between the electrolytic solution and the lithium cobaltate substrate, can suppress the dissolution of the transition metal, and further can provide electrochemical energy.

The invention discloses an inorganic filler composite PEO solid electrolyte material, a preparation method thereof, and an all-solid-state battery. The all-solid-state battery includes a positive electrode layer, a negative electrode layer and a composite solid electrolyte layer, and the composite solid electrolyte layer is positioned between the positive electrode layer and the negative electrodelayer, and adopts the inorganic filler composite PEO solid electrolyte material. The inorganic filler composite PEO solid electrolyte material includes polyoxyethylene, an inorganic powder having a high ionic conductivity, and a lithium salt. The preparation method comprises the following steps: A, adding the lithium salt to an organic solvent, and performing stirring until the lithium salt is completely dissolved; B, adding the inorganic powder to the above obtained solution, and performing uniform stirring; C, adding the polyoxyethylene to the above obtained mixed solution, and performing stirring to obtain a suspension; and D, pouring the suspension into a mold, and drying the suspension to obtain the solid electrolyte material. The inorganic filler composite PEO solid electrolyte material has a high ionic conductivity and good mechanical performances, the assembled all-solid-state battery can effectively improve the interface stability between the electrolyte and negative electrode metal lithium, and has high rate performances.

The invention provides a modified lithium nickel cobalt manganese oxide cathode material which comprises a lithium nickel cobalt manganese oxide material, LiMnPO4 combined on the surface of the lithium nickel cobalt manganese oxide material, and graphene combined on the surface of LiMnPO4. According to the invention, the lithium nickel cobalt manganese oxide material is modified through double combination, wherein a layer of LiMnPO4 coating the surfaces of particles can improve the interface stability of the material under a high cut-off voltage, and graphene coating at the outer layer can improve the electronic conductivity of the material and weak the polarization effect.

The invention provides an amphiphilic Janus nano particle and a preparation method and application thereof. The preparation method comprises the following steps: dispersing silicon dioxide nanoparticles in water to obtain a dispersion liquid, mixing the dispersion liquid and liquid paraffin, heating and stirring in a water bath to form a Pickering emulsion, cooling to obtain small wax balls, adding a silane coupling agent into the small wax balls for modification to obtain modified small wax balls, mixing the modified small wax balls, an amidation catalyst and C12-C18 saturated fatty acid, andcarrying out an amidation reaction process to obtain organic hydrophobic chain grafted oil-water amphiphilic nanoparticles, and removing paraffin in the organic hydrophobic chain grafted oil-water amphiphilic nanoparticles to obtain the amphiphilic Janus nano particles. When the surfactant is used as an oil-displacing agent, oil-water interfacial tension can be effectively reduced at low concentration, rock wettability is changed, oil-displacing efficiency of nanofluid is remarkably improved, economic cost is reduced, and the surfactant has a wide application prospect.

The present invention discloses a hollow structure lithium-ion battery positive electrode material and a preparation method thereof. The preparation method comprises: preparing a metal salt solution, adding the metal salt solution, a precipitation agent and a complexing agent into a reaction kettle, carrying out co-precipitation to prepare a precursor, uniformly mixing the precursor and a lithium source, and carrying out sectional temperature control calcination to obtain the positive electrode material. According to the present invention, the preparation process is simple, the cost is low, the application prospects are broad, and the prepared positive electrode material has characteristics of substantially-improved electrochemical performance, good rate performance, and good cycle performance.

Belonging to the technical field of lithium ion batteries, the invention discloses a lithium ion battery cathode material and a preparation method thereof. The chemical molecular formula of the cathode material is Lix(NiaCobMnc)1-yMyO2, wherein x is greater than or equal to 0.96 and smaller than or equal to 1.04, y is greater than or equal to 0.01 and smaller than or equal to 0.06, a is greater than or equal to 0.8 and smaller than or equal to 0.9, and a+b+c=1, M has a general formula of BzM'1-z, M' is composed of one or several of the following elements: Al, Mg, Ti and Zr, and z is greater than or equal to 0.1 and smaller than or equal to 0.5. The cathode material is coated by a layer of compound containing L, B, Ni, Co and Mn, the content of B in the outermost surface of the coating layer is at least two times that of the B in the innermost layer of the coating layer. According to the invention, the high capacity cathode material is acquired from a high nickel content ternary system, additionally multielement doping is employed to stabilize the crystal structure of the material, and then by means of washing, boron element surface modification and two-step sintering process, the material surface structure can be improved, and the surface residual alkali content can be reduced to improve the interface stability. The whole technological process of the invention is simple, and is easy for large scale production.

The invention belongs to the field of all-solid-state lithium batteries, and discloses a lithium lanthanum zirconium oxide solid electrolyte. The lithium lanthanum zirconium oxide solid electrolyte comprises 60-75wt% of a polymer, 8-15wt% of a lithium salt and 15-30wt% of a lithium lanthanum zirconium oxide three-dimensional porous inorganic network, wherein the polymer is compounded in the lithium lanthanum zirconium oxide three-dimensional porous inorganic network in situ. The invention also discloses a preparation method of the lithium lanthanum zirconium oxide solid electrolyte and application of the lithium lanthanum zirconium oxide solid electrolyte in the field of lithium ion batteries. The lithium lanthanum zirconium oxide three-dimensional porous network provides a continuous lithium ion transmission channel, so that the ionic conductivity is higher. Meanwhile, due to the existence of the lithium lanthanum zirconium oxide three-dimensional porous network, certain mechanical properties are provided for the composite solid electrolyte, the growth of lithium dendrites can be inhibited, and the high-temperature performance and safety of the battery are improved. Therefore, theinterfacial compatibility and stability between the solid electrolyte and the electrode are optimized and improved, and the formed all-solid-state lithium battery has the advantages of being stable in cycle performance, high in rate capability, low in interfacial impedance and good in stability.

The invention relates to the field of lithium ion batteries, and discloses a lithium ion battery cathode material precursor, a lithium ion battery cathode material, preparations methods of the lithiumion battery cathode material precursor and the lithium ion battery cathode material, and a lithium ion battery. The structural formula of the precursor is z[(Ni<x1>Co<y1>Mn<1-x1-y1-eta1>D<eta1>)(OH)2].(1-z)[(Ni<x2>Co<y2>Mn<1-x2-y2-eta2>G<eta2>)(OH)2], wherein x1 is greater than or equal to 0.6 and less than 1, x2 is greater than or equal to 0.6 and less than 1, y1 is greater than 0 and less thanor equal to 0.4, y2 is greater than 0 and less than or equal to 0.4, eta1 is greater than 0 and less than or equal to 0.1, eta2 is greater than 0 and less than or equal to 0.1, and z is greater than 0and less than 1. By controlling the gradient change of the doping element D and G at the inner core part and the outer core part of the precursor, a material with a stable crystal phase structure isobtained, and the cycle life of the lithium ion battery cathode material can be effectively prolonged and the stability of the lithium ion battery cathode material can be effectively improved on the basis of maintaining the high capacity characteristic and rate performance.

The polymer lithium ion cell includes anode plate, cathode plate and electrolyte. At least one of the anode plate and the cathode plate has polymer substrate material film comprising polymer A and polymer B, the polymer A is poly(methyl methacrylate-acrylonitrile-lithium methacrylate) and the polymer B is poly(vinylidene difluoride) or poly(vinylidene difluoride-hexafluoropropylene). During the preparation of the cell, the polymer substrate material is painted directly onto anode plate and/or the cathode plate to form cell diaphragm, and electrolyte liquid is filled to form polymer electrolyte. The polymer lithium ion cell has simple preparation process and no need of addition diaphragm.

The invention discloses surface-modified inorganic nanoparticles as well as a preparation method and application thereof. The surface-modified inorganic nanoparticles are composed of a core of inorganic metal oxide nanoparticles and amphipathic organic segments grafted on the surface of the particles, wherein the amphipathic organic segments grafted on the surface of the particles account for 0.1-50% of total mass of the surface-modified inorganic nanoparticles; the inorganic metal oxide nanoparticles refer to one or several in aluminum oxide, silicon dioxide, titanium dioxide, zirconium dioxide and zinc oxide inorganic nanoparticles; and the amphipathic organic segments are produced from a vinyl silicane coupling agent and 2-acrylamido--methylpropane sulfonic acid through solution polymerization. The surface-modified inorganic nanoparticles can be used for preparing polymer electrolyte. Therefore, the inorganic nanoparticles are high in dispersity in a polymer matrix, and the prepared polymer electrolyte is high in lyotropic property, high in ionic conductivity and stable in electrochemical performance.