718results about How to "Reduce interface impedance" patented technology

The invention relates to organic-inorganic all-solid-state composite electrolyte as well as preparation and application methods thereof, belonging to the field of lithium ion batteries. According to the organic-inorganic all-solid-state composite electrolyte, a highly-ordered three-dimensional connection network skeleton is formed by an inorganic fast lithium ion conductor, and a three-dimensional connection network is filled with a polymer and lithium salt. The organic-inorganic all-solid-state composite electrolyte which is flexible and has a controllable three-dimensional connection network structure is prepared. The electrolyte is high in lithium ion conductivity, wide in electrochemical window, good in mechanical property and stable to lithium metal. A lithium ion secondary battery assembled by a composite electrolyte membrane prepared by the method is high in capacity, stable in cycle performance, low in interface impedance and good in interface stability.

The present invention relates generally to medical devices; in particular and without limitation, to unique electrodes and/or electrical lead assemblies for stimulating cardiac tissue, muscle tissue, neurological tissue, brain tissue and/or organ tissue; to electrophysiology mapping and ablation catheters for monitoring and selectively altering physiologic conduction pathways; and, wherein said electrodes, lead assemblies and catheters optionally include fluid irrigation conduit(s) for providing therapeutic and/or performance enhancing materials to adjacent biological tissue, and wherein each said device is coupled to or incorporates nanostructure or materials therein. The present invention also provides methods for fabricating, deploying, and operating such medical devices.

The invention provides a polymer porous membrane, a preparation method of the polymer porous membrane, a polymer electrolyte, a polymer battery and a preparation method of the polymer battery. A carbon material is dispersed in the polymer porous membrane, so that the degree of crystallization of a polymer which constitutes the polymer porous membrane is lowered and the liquid absorption of the polymer porous membrane is increased; the liquid absorption rate, liquid holding capability and ionic conductivity of the polymer porous membrane are increased; interface impedance is reduced, battery magnification discharging performance and the circulating performance of the battery are enhanced; simultaneously, the battery prepared by the method has excellent high temperature circulation and storage performance and low expansion ratio at a high temperature and further meets the development requirement of the polymer battery. Simultaneously, the preparation method is simple and is easy to implement and the prepared battery has high performance.

The invention discloses an all-solid-state lithium ion battery and a preparation method thereof. The all-solid-state lithium ion battery is prepared by an ink-jet printing technology; different components are dissolved into a solvent to prepare slurry; the slurry is put into different ink boxes; designing is carried out by computer program; electrodes and electrolyte are longitudinally printed in a stepwise gradient manner; the electrolyte longitudinally changes in electrode plates in a gradient manner; the interface impedance of an electrode active material/electrolyte can be reduced by the gradient structure distribution of the electrolyte in the electrode plates; deep conduction of lithium ions is facilitated; the capacity property of the active material is put into the greatest play; and other parts, except for a current collector, of the all-solid-state lithium ion battery structure prepared by ink-jet printing form an overall lamination structure. Various components in the lamination structure are in tight contact and regular arrangement, so that the interface impedance is much lower than that of the all-solid-state lithium ion battery which is prepared in a mechanical superposition manner; and the ink-jet printing mode is convenient, fast and suitable for large-scale production.

The invention discloses a composite lithium ion battery ceramic diaphragm, wherein single-face or double-face electrostatic spinning is carried out on a ceramic coating diaphragm. The preparation method comprises the following steps: step 1, preparing an electrostatic spinning solution; step 2, carrying out electrostatic spinning; and step 3, treating the composite diaphragm obtained by spinning. The electrostatic spinning is carried out on the surfaces of the existing polyolefin ceramic coating diaphragm and non-woven fabric ceramic coating diaphragm, the electrostatic spinning can be used for fastening and constraining ceramic granules to prevent the ceramic granules from dropping, and moreover, the electrostatic spinning is used as a soft buffering layer to perfect the contact of the diaphragm with the surface of an electrode, so as to reduce the interface impedance of the diaphragm and a battery pole piece and help to improve such properties of the battery as rate discharge and cycle life, etc.

The invention provides a lithium-ion battery electrolyte, which is composed of an organic solvent, lithium salt, a novel additive and other conventional additives. The novel additive is a dicyclophosphimide lithium salt or lithium dicyclothiophosphimide lithium salt compound shown in a structural formula 1. The compound shown in structural formula 1 of the invention has a high reduction potentialwhen used as an electrolyte additive, so that the novel additive can participate in the formation of a solid electrolyte film on the surface of a negative electrode in preference to the conventional additives and improve the composition of the interfacial film. Because the additive has a cyclic phosphate structure, the phosphorus-oxygen bond is easy to break under high voltage, and the additive can participate in the formation of a positive electrolyte film and improve the interface stability of the positive electrode material. Therefore, the introduction of the additive can improve the high temperature performance, low temperature performance and cycle performance of lithium-ion batteries.

The invention relates to the field of processing of lithium ion battery diaphragms, and discloses a lithium ion battery diaphragm with a polymer inorganic coating. The diaphragm comprises a macroporous polyolefin membrane and a coating layer on one side or two sides of the macroporous polyolefin membrane, wherein the coating layer consists of 20 to 60 weight percent of coating composition and 40 to 80 weight percent of water; the coating composition comprises 0.1 to 5 weight parts of water-soluble polymer thickener, 0.1 to 5 weight parts of water-based dispersing agent, 10 to 90 weight parts of polymer particles, 9.7 to 70 weight parts of ceramic particles and 0.1 to 10 weight parts of water-based latex. The invention also discloses a method for preparing the lithium ion battery diaphragm with the polymer inorganic coating. The lithium ion battery diaphragm has the advantages of low mechanical equipment friction loss, uniform and consistent coating thickness and favorability for large-scale continuous production.

The invention relates to the technical field of lithium batteries and in particular relates to a composite negative electrode of a solid-state lithium battery and a preparation method of the compositenegative electrode. The composite negative electrode of the solid-state lithium battery comprises a solid-state electrolyte thin film layer and a lithium negative electrode layer, wherein the lithiumnegative electrode layer comprises a lithium metal negative electrode material; the lithium metal negative electrode material is combined on the solid-state electrolyte thin film layer at a molten state to form the lithium negative electrode layer. The lithium metal negative electrode material is combined on the solid-state electrolyte thin film layer at the molten state to form the lithium negative electrode layer; the wetting performance between the lithium negative electrode layer and the solid-state electrolyte thin film layer can be improved very well and the formation of lithium dendritic crystals is inhibited very well; the safety performance of the lithium battery with a negative electrode structure is improved; meanwhile, the interface impedance between the lithium negative electrode layer and the solid-state electrolyte thin film layer is reduced very well, the migration rate of conductive ions between the lithium negative electrode layer and the solid-state electrolyte thinfilm layer is improved and the conductivity of the lithium negative electrode layer is improved.

The invention discloses high voltage electrolyte considering high and low temperature performance and a lithium ion battery using the electrolyte. The high voltage electrolyte comprises a non-aqueous organic solvent, an electrolyte lithium salt, an ether nitrile compound and a low impedance additive, wherein the non-aqueous organic solvent comprises a carbonate solvent and a linear carboxylic acid ester solvent with a wide liquid range; the electrolyte lithium salt is a combination of lithium hexafluorophate and lithium triflurosulfimide according to a molar ratio of 0.01-0.5; and the low impedance additive is a cyclic sulfate compound. The linear carboxylic acid ester solvent for perfecting the electrode/ electrolyte interface is contained in the high voltage electrolyte, by means of the optimized combination of the ether nitrile compound, the lithium triflurosulfimide and the cyclic sulfate compound and other additives, a high voltage battery can be guaranteed to have excellent circulation performance, and meanwhile, the excellent high and low temperature performance of the high voltage battery of storage for 18 h in a full charge state at 85 DEG C and no lithium separation in the full charge state at 0 DEG C is considered.

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 invention belongs to the technical field of batteries, and particularly relates to a composite solid-state electrolyte which comprises an organic polymer, a lithium salt, an ionic liquid and an inorganic solid electrolyte material, wherein the mass ratio of the polymer to the lithium salt to the ionic liquid to the inorganic solid electrolyte material is 1: (0.1-0.6): (0.1-1): (0.05-0.2). Thecomposite solid-state electrolyte disclosed by the invention is high in ionic conductivity, high in stability, good in compatibility with positive and negative electrodes and excellent in mechanical property, and the composite solid-state electrolyte has excellent mechanical property due to a polymer framework; the lithium salt provides lithium ions for the solid electrolyte; the ionic liquid improves the conductivity of the electrolyte; the inorganic solid electrolyte material can be crosslinked with the polymer to further improve the mechanical properties of the solid electrolyte and increase the strength.

The invention provides an electrolyte/electrode interface integrated construction technology of an all-solid-state lithium battery. According to the electrolyte/electrode interface integrated construction technology, a polymer electrolyte layer is prepared on a positive electrode material layer in situ; the interface contact between the positive electrode material layer and the electrolyte layer is improved and the interface impedance is reduced, so that the rate performance and the circulating performance of the battery are improved. A construction process of the all-solid-state lithium battery is extremely simplified, the cost is reduced and the interface contact is optimized; meanwhile, the electrical conductivity and the electrochemical stability of polymer electrolyte are improved.

The invention relates to the technical field of lithium secondary battery additives and particularly relates to a lithium secondary battery additive, a preparation method thereof and application thereof. The additive is LibMaXc, M is B, Al, Ga, In, Y, Sc, Sb, Bi, Nb, Ta, Ti, Zr, V, Cr, Mo, W, Mn, Tc, Re, Fe, Co, Ni, Cu, Ag, Zn, Cd, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb or Lu, X isF, Cl, Br or I, b is larger than or equal to 0.2 and smaller than or equal to 6, a is larger than or equal to 0.1 and smaller than or equal to 3, and c is larger than or equal to 1 and smaller than or equal to 9. The lithium secondary battery additive has the advantages of high ionic conductivity and air stability, the rapid transmission of electrode ions can be improved, the electrode loading capacity and thickness are improved, and the energy density of the battery is improved.

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 discloses an electrochemical sensor used for bisphenol A detection, which belongs to the technical field of electrochemical analysis detection. The invention also discloses a preparation method for the electrochemical sensor and an application of detecting bisphenol A in a single pattern. The preparation method for the electrochemical sensor comprises the following steps: grafting beta-cyclodextrin to the surface of a carbon nano tube, wherein the beta-cyclodextrin can be easily dispersed into secondary distilled water; dropwise adding a dispersion to a glassy carbon electrode; and evaporating to dry a solvent to obtain the electrochemical sensor constructed by a sensitive film and the glassy carbon electrode. The electrochemical sensor has high sensitivity on detecting the bisphenol A and high stability, and the detection lower limit reaches 1*10-9mol/L.

The invention discloses a composite solid electrolyte and a preparation method thereof. The composite solid electrolyte is at least prepared from a sulfide solid electrolyte layer and an amorphous oxide solid electrolyte layer. By adopting the composite solid electrolyte, the amorphous oxide solid electrode is compounded on the surface of the sulfide solid electrolyte layer, so that the interfaceproblem between the sulfide solid electrolyte and an electrode material is solved. Meanwhile, a hot-press molding manner is adopted to ensure a good compounding effect on an heterogeneous interface (oxide/sulfide interface).

The invention discloses a preparation method of a flower-like tin dioxide and graphene composite material, belonging to the technical field of functional composite materials. According to the preparation method disclosed by the invention, the flower-like tin dioxide and graphene composite material with controllable morphology is prepared from graphene oxide, tin chloride pentahydrate and sodium hydroxide as raw materials by adopting the steps of mixed stirring, hydro-thermal synthesis, solid-liquid separation, cleaning and drying. The method disclosed by the invention has the advantages of simpleness, convenience for operation, lower production cost, no influence on the environment and convenience for popularization and application; and in the method, water is used as solvent and no surfactant is used. The flower-like tin dioxide and graphene composite material prepared by adopting the method can be widely applied to new energy source devices such as a lithium ion battery, a solar cell, a super capacitor and the like, or can be applied to the fields of catalyst carriers, information materials and the like.