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677 results about "Lithium dendrite" patented technology

Preparation method of composite lithium metal anode

The invention discloses a preparation method of a composite lithium metal anode and belongs to the technical field of lithium metal batteries. The preparation method of the composite lithium metal anode comprises steps as follows: firstly, the surface of a framework material is modified, the framework material with the lithiophilic surface is prepared, the framework material is contacted with liquid metal lithium, so that the liquid metal lithium is injected into the framework material with the lithiophilic surface, and the composite lithium metal anode is prepared after cooling. The lithiophilic surface can be obtained through modification of various framework materials (including a conductive framework material and an insulated framework material), the framework materials are efficientlycomposited with the liquid metal lithium, and the composite lithium metal anode material is obtained. When the obtained composite lithium metal anode material is assembled in a total battery, growthof lithium dendrites can be effectively inhibited, the volume expansion effect of the anode is relieved, the pulverization phenomenon of the lithium metal anode is reduced, and the cycling stability and the safety of the lithium metal battery are substantially improved, and the cycle life of the lithium metal battery is substantially prolonged.
Owner:TSINGHUA UNIV

Composite quasi-solid-state electrolyte and preparation method thereof, and lithium battery or lithium ion battery containing composite quasi-solid-state electrolyte

The present invention provides a composite quasi-solid-state electrolyte, a composite quasi-solid-state electrolyte membrane, preparation methods of composite quasi-solid-state electrolyte and the composite quasi-solid-state electrolyte membrane, and a lithium battery or a lithium ion battery containing the composite quasi-solid-state electrolyte membrane. The composite quasi-solid-state electrolyte comprises a solid electrolyte, a lithium salt-containing liquid electrolyte, inorganic nanoparticles and a binder, wherein the static electricity or functional groups on the surface of the inorganic nanoparticles can adsorb the electrolyte so as to make the composite quasi-solid-state electrolyte have strong adsorption capacity and strong liquid retention ability, and the inorganic nanoparticles can adsorb the lithium salt so as to change the lithium ion conduction mechanism, reduce the interfacial resistance between the liquid electrolyte and the solid-state electrolyte, change the deposition morphology of lithium, hinder the formation of lithium dendrite, and reduce the pulverization of lithium. In addition, by adding the solid electrolyte, the composite quasi-solid-state electrolyteof the present invention can maintain the high conductivity and can effectively reduce the content of the liquid electrolyte so as to improve the safety of the battery.
Owner:BEIJING WELION NEW ENERGY TECH CO LTD

Metal lithium negative electrode with organic and inorganic dual protection layers

The invention relates to a metal lithium negative electrode with organic and inorganic dual protection layers. The invention belongs to the technical field of electrochemistry, and relates to the metal lithium negative electrode with the organic and inorganic dual protection layers and application of the metal lithium negative electrode in a secondary lithium battery. The protection layers are characterized in that an organic protection layer is built on a surface of the metal lithium negative electrode from one or more of acrylate containing amino, cyan, nitro or nitroso, one or more of acrylic organic matters except several types of the acrylates and one or more of small molecule compounds containing nitrogen, meanwhile, a nitrogen-containing part in the organic layer reacts with metal lithium to form an inorganic protection layer at an interface in an in-situ way, so that the organic and inorganic dual protection layers are formed. When the metal lithium negative electrode with the protection layers is applied to a lithium battery, the coulombic efficiency of the battery can be effectively improved by a synergistic effect of the organic layer and the inorganic layer, the growth of lithium dendrites is prevented, the safety problem is improved, and the cycle lifetime is prolonged.
Owner:QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI

Inorganic-organic nano composite solid electrolyte membrane and preparation method and application thereof

The present invention discloses an inorganic-organic nano composite solid electrolyte membrane and a preparation method and application thereof. The composite solid electrolyte is a novel inorganic-organic nanocomposite combining the respective advantages of inorganic ceramic solid electrolyte and organic polymer electrolyte and is composed of a negative electrode protective layer, a support layerand a positive electrode interface layer. The support layer plays a supporting role, and the main component of the negative electrode protective layer is the inorganic solid electrolyte with good mechanical properties, which can effectively inhibit the growth of lithium dendrite; and the positive electrode interface layer is mainly composed of organic polymer electrolyte with good flexibility, ensures good contact with active materials and provides a continuous ion transport channel. In the present invention, the composite solid electrolyte with good interface compatibility is prepared by coating on both sides of the support layer, and the process is simple and efficient. The composite solid electrolyte can effectively inhibit dendritic crystal and reduces interface resistance so that a solid lithium metal battery has higher energy density and longer cycle life.
Owner:SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI

Lithium ion power cell with high power

The invention discloses a high-power lithium ion power battery, comprising a plurality of single electrical cores connected in parallel. Each single electrical core consists of an anode plate, a cathode plate, a separator film, and two to eight anode tabs and cathode tabs. The anode tabs and the anode plate are integrated as a whole which is punched on the aluminum foil of the current collector of the anode; the cathode tabs and the cathode plate are integrated as a whole which is punched on the copper foil of the current collector of the cathode. All the tabs of the anodes of the single electrical cores are welded on a positive pole, while all the tabs of the cathodes are welded on a negative pole. By the structure of a variety of single electrical cores connected in parallel and a plurality of tabs integrated as a whole, the high-power lithium ion power battery leads the total essential resistances of the batteries to be further reduced and the currents of the anode and cathode plates to be distributed more uniformly, as a result, the high-power lithium ion power battery has the advantages of small essential resistances in total, high discharge rate, lower possibility of forming lithium dendrites, long cycle life and high specific power etc., and is widely used in electric vehicles, electric tools and other equipment in need of high-power batteries.
Owner:TSINGHUA UNIV

Battery diaphragm with high-temperature-resistant metal-organic frame material coating, and preparation method and application thereof

The invention discloses a battery diaphragm with high-temperature-resistant metal-organic frame material coating, and a preparation method and application thereof. The battery diaphragm takes a commercial diaphragm as the substrate, and the single surface or double surface is coated with the metal-organic frame material. Compared with the prior art, the battery diaphragm disclosed by the inventionhas the following advantages: the metal-organic frame material coating is high in porosity and large in specific area, and the electrolyte wetting property of the diaphragm can be improved; the metalorganic frame material coating can effectively improve the heat-insulating property of the diaphragm, and improve the safety performance of the battery in the high-temperature environment; the metal-organic frame material coating can effectively control the shuttle of the electrolyte ion, improve the ion transport number, restrain the bad and side effect, improve the battery capacity, and prolongthe circulating life; the uniform duct structure enables the lithium ions to be uniformly deposited/peeled, thereby fundamentally restraining the growth of the lithium dendrites; the battery diaphragm disclosed by the invention has good flexibility and mechanical performance, and can be used for assembling a practical soft-package battery.
Owner:NANJING UNIV

Preparation and application of lithium metal anode with composite film

The invention belongs to the field of lithium batteries, and discloses preparation and application of a lithium metal anode with a composite film. The preparation method comprises the following stepsof: (1) performing matching and composite load of an organic component and an inorganic lithium compound component according to the mass ratio of 1:1-98:1 on a current collector; and (2) assembling the obtained current collector with the surface coated with a composite film with a lithium sheet into a battery for electrochemical deposition to deposit the metal lithium on the current collector withthe surface coated with the composite film so as to obtain a lithium metal anode material with a composite film. According to the invention, the lithium metal anode material with the composite film is obtained by improving the overall design of the flow process of the anode material preparation method, the phenomenon of lithium dendrite caused by uneven deposition in the circulation process of the conventional lithium metal anode and the phenomenon of reduced circulation performance caused by dead lithium generated by the reaction of the lithium metal anode and electrolyte can be solved, andthe lithium metal anode material can be used as the anode in a lithium metal battery, so that the circulation life of the lithium metal battery is prolonged.
Owner:HUAZHONG UNIV OF SCI & TECH

Negative pole piece as well as preparation method thereof, and lithium ion battery

InactiveCN108258193AThe total capacity per unit area increasesReduced risk of short circuitsCell electrodesSecondary cellsPole pieceLithium-ion battery
The invention belongs to the field of lithium ion batteries and relates to a negative pole piece. The negative pole piece comprises a negative current collector and a negative material layer adhered onto the surface of the negative current collector; the negative material layer comprises a first negative material layer and a second negative material layer; the first negative material layer comprises a first material area and a second material area positioned on the edge of the first material area and is adhered onto the surface of the negative current collector; the thickness of the first material area is greater than that of the second material area; the second negative material layer is adhered onto the surface of the second material area and is positioned on the edge of the first negative material layer. The negative pole piece provided by the invention has the benefits that the risk of battery short-circuit caused by potential production of lithium dendrites due to relatively low edge coating weight of a conventional negative sheet is reduced, the occurrence probability of safety accidents of the lithium ion battery is reduced, and the safety performance of the lithium ion battery is improved.
Owner:湖南三迅新能源科技有限公司

Dopamine-modifying ceramic composite separator and application thereof

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.
Owner:XIAMEN UNIV

Lithium metal negative electrode dual protection method and application

The invention discloses a lithium metal negative electrode dual protection method and application. The method comprises the steps of: infiltrating a lithium metal negative electrode in a mixture of ametal halide and an additive, and forming a composite protective layer in situ on the surface of the lithium metal negative electrode, wherein the composite protective layer comprises combination of an alloy and an inorganic salt; and coating the surface of a membrane with an organic polymer solution to obtain a membrane having an inner surface coated with an elastic organic modifying layer. The lithium metal negative electrode dual protection method and application are simple to operate, high in controllability, low in raw material cost, easy to obtain the raw materials and low in cost, and can form a layer of stable composite protective layer at the surface of the lithium metal negative electrode. The protective layer can effectively inhibit the growth of the lithium dendrites and can reduce the side reaction generated by contact of the lithium metal negative electrode and the electrolyte, and the obtained modified lithium metal negative electrode is stable in cycle performance to effectively inhibit the generation of the dendrites of the lithium metal negative electrode and can be widely applied to the novel high specific energy electrochemical energy storage device, such as a lithium ion battery and a lithium-sulfur battery.
Owner:安徽盟维新能源科技有限公司

Passivated lithium metal-carbon skeleton composite material and preparation method and application thereof

The invention discloses a passivated lithium metal-skeleton carbon composite material and a preparation method and application thereof. The composite material is prepared from a lithium metal-skeleton carbon composite material and a passivated layer, wherein the lithium metal-skeleton carbon composite material is prepared from a porous carbon material carrier and lithium metal which is at least distributed in holes of the porous carbon material carrier, and the passivated layer is at least used for stopping the lithium metal in the lithium metal-skeleton carbon composite material from directly contacting the outside world. As the artificial passivated layer is formed on the particle surface of the lithium metal-carbon skeleton composite material, the phenomenon that lithium metal is corroded by electrolyte in a circulating process is effectively reduced, and lithium dendrites are prevented from forming; thus, the obtained passivated lithium metal-carbon skeleton composite material has the advantages of good circulating stability, high coulombic efficiency and the like in electrochemical circulation, can be widely applied to chemical energy storing devices of rechargeable lithium batteries, rechargeable lithium ion batteries and the like, can effectively improve coulombic efficiency, circulating stability and energy density of batteries.
Owner:SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI

Lithium cathode used for lithium battery and provided with sandwich structure and preparation method thereof

The invention discloses a lithium cathode used for a lithium battery and provided with a sandwich structure and a preparation method thereof. The lithium cathode is provided with the sandwich structure formed by a conductive current collector, a metal lithium layer and a high polymer material layer. The method for preparing the lithium cathode comprises a first step of preparing an electrode precursor by compounding a high polymer material and the conductive current collector; and a second step of causing metal lithium to enter an intermediate layer of the electrode precursor to form the lithium cathode with the sandwich structure. By introduction of the high polymer material as a protective layer, growth of metal lithium dendrites can be inhibited, the safety of the lithium battery is improved, the volume expansion in the lithium battery cyclic process can be adapted, and an effect of stabilizing an interface is achieved. In addition, the conductive high polymer material can form a conductive network on the surface of the lithium cathode, lithium ions are induced to be deposited evenly, and a buffer effect on the lithium ions can also be achieved under the conditions of high-current charging and discharging. The method is simple to operate, low in cost, has easiness in large-scale production and has great potential application values in the lithium battery.
Owner:SHANGHAI INST OF SPACE POWER SOURCES

Composite negative electrode, preparation method of negative electrode and lithium-sulfur secondary battery with negative electrode

The invention discloses a composite negative electrode, a preparation method of the negative electrode and a lithium-sulfur secondary battery with the negative electrode. The composite negative electrode comprises copper foil and a solid lithium ion conductive diaphragm tape, wherein one end of the copper foil is provided with a tab for conducting current, at least one side of the copper foil is closely provided with metal lithium foil or alloy lithium foil which is used as a battery negative electrode, and the solid lithium ion conductive diaphragm tape covers the battery negative electrode, so that the accumulation of lithium ions on a negative electrode lithium alloy surface and the short circuit, caused by lithium dendrites, between a positive electrode and the negative electrode of the battery can be prevented. In the manner, on the premise of maintaining high energy density, the safety performance of the lithium-sulfur battery can be improved. In addition, multi-element compound electrolyte is used for substituting for organic electrolyte, so that the dissolving and diffusion of sulfur in the electrolyte can be effectively prevented, and the cycling life of the battery can be greatly prolonged.
Owner:GENERAL ELECTRONICS BATTERY CO LTD

Lithium negative electrode protective film, preparation method and lithium metal secondary battery

The invention relates to a lithium negative electrode protection film, a preparation method and a lithium metal secondary battery, belonging to the field of lithium metal secondary batteries. The lithium anode protective film is composed of lithium salt, ionic liquid, inorganic nanoparticles and lithium-treated Nafion polymer. Ionic liquids containing lithium salts are adsorbed on the surface of inorganic nanoparticles and uniformly dispersed in lithium-treated Nafion polymers. By arranging a mixed solution of lithium salts and ionic liquids; Mixing the mixed solution and the inorganic nanoparticles by sealed ball milling to obtain a quasi-solid electrolyte; The quasi-solid electrolyte is mixed with a lithium-treated Nafion polymer solution, coated on the surface of lithium or copper foil,and the protective film is prepared after the solvent is completely volatilized. As that lithium negative electrode protective film can inhibit the generation of lithium dendrite, the lithium negative electrode protective film has good mechanical properties and chemical stability, high lithium ionic conductivity and good film for performance; A lithium metal secondary battery provide with that lithium anode protective film has excellent electrochemical performance.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
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