16results about How to "Improve Lithophilicity" patented technology

The invention discloses a composite current collector, a preparation method thereof and a battery. The composite current collector comprises a base film and a copper layer, wherein the copper layer is positioned on at least one surface of the base film; holes are formed in the surface of the copper layer; the carbon nano tube array is positioned on the surface of the hole; and a Cu2Se nano array, wherein the Cu2Se nano array is located on the surface of the carbon nano tube array. And meanwhile, the composite current collector with the hole structure, the carbon nanotube array and the Cu2Se nano array can remarkably reduce the internal resistance of the battery after circulation, and the lithium precipitation behavior on the surface of the negative electrode is inhibited while the quick charging capacity of the battery is improved.

The invention belongs to the technical field of lithium ion battery negative electrode materials, and particularly relates to a high-temperature self-healing composite silicon carbon electrode and a preparation method thereof.The high-temperature self-healing composite silicon carbon electrode comprises a copper foil, the two faces of the copper foil are coated with negative electrode active layers, and liquid metal layers are applied to the negative electrode active layers through supersonic spraying; the liquid metal is condensed and rolled in a gap of the negative electrode active layer; the negative electrode active layer is prepared by coating negative electrode slurry, the negative electrode slurry is prepared by mixing small-particle-size graphite, graphite, a silicon material, a binder and deionized water, the mass ratio of the small-particle-size graphite to the graphite to the silicon material is (0.5-1): (1.5-3): (6-8), and the viscosity of the negative electrode slurry is 3000-6000 mPa.s. Graphite with different particle sizes and a silicon material are used as negative electrode active substances for mixing, so that the compaction of an electrode material is effectively improved, the specific surface area of an electrode is reduced, and the first coulombic efficiency of a negative plate is facilitated.

The invention discloses a micro-texture porous multilayer structure composite current collector and a preparation method thereof. The composite current collector comprises a porous polymer film located in the middle, chemical plating metal layers located on the two sides of the porous polymer film, micro-texture metal copper layers located on the outer sides of the two chemical plating metal layers, and corrosion-resistant lithium-loving layers located on the outer sides of the two micro-texture metal copper layers. The surface area of the current collector is increased by arranging the porous polymer film and the micro-texture metal copper layer, so that the charging and discharging current is increased, and the effect of inhibiting the abnormal growth of lithium dendrites is achieved; metallization of the outer surface of the porous polymer film is realized by arranging the chemical plating metal layer, so that low-cost and high-yield metallization is realized; by arranging the corrosion-resistant lithium-loving layer, the corrosion resistance and the lithium-loving property of the current collector are improved, the corrosion-resistant requirement of a sulfide solid-state battery as a representative lithium ion battery is met, and the effects of promoting nucleation of lithium dendrites and inhibiting abnormal growth of the lithium dendrites are achieved.

The application discloses a composite lithium-magnesium alloy negative electrode and a preparation and application thereof. After a fluorinated copolymer solution is uniformly loaded on the surface of a three-dimensional conductive framework, the three-dimensional conductive framework is combined with a lithium-magnesium alloy foil in a sandwich arrangement mode, and then the combination is obtained through mechanical rolling. The three-dimensional conductive framework material effectively reduces the size of the local current density, and can also provide sufficient accommodation space for the deposition of metal lithium. The elastic self-adaptive interface rich in LiF formed by using the fluorinated copolymer can accelerate the ion transmission at the interface and maintain the stability in a long cycle process. The lithium-magnesium alloy with the lithium affinity induces the uniform deposition of lithium ions, and the growth of dendrites is inhibited, so that the composite lithium-magnesium alloy negative electrode material with the fluorine-rich lithium elastic self-adaptive interface is constructed.

The invention belongs to the field of lithium metal batteries, and particularly discloses a polymer solid electrolyte film containing an inorganic functional filler and a preparation method of the polymer solid electrolyte film. The thin film comprises a porous diaphragm, electrolyte slurry and inorganic filler, the electrolyte slurry and the inorganic filler are distributed on two sides of the porous diaphragm, the electrolyte slurry comprises a polymer capable of transmitting lithium ions, a lithium salt compound and an organic additive, and the surface of the inorganic filler is coated with metal fluoride with a certain thickness through an atomic layer deposition technology. And the thickness of the electrolyte layer on the two sides of the porous diaphragm is 20 microns. According to the polymer solid electrolyte (PPLS) film with the uniformly and compactly cured surface, the nanofiber diaphragm with excellent porosity and high mechanical strength is used as a skeleton support, the nanofiber diaphragm is coated with the solid electrolyte layer with relatively low crystallinity, so that the Li < + > ion conductivity of the polymer solid electrolyte (PPLS) is remarkably improved, and the polymer solid electrolyte (PPLS) film is simple in preparation process and low in cost. The large-scale continuous production is easy.

The invention relates to a lithium metal composite negative electrode and a preparation method and application thereof.The lithium metal composite negative electrode comprises a polymer substrate layer, a composite layer and a lithium metal layer which are sequentially arranged from inside to outside, the composite layer comprises a second polymer and lithium alloy, the lithium alloy is LiMx, and M is selected from one or more of Ag, Al, Ba, Bi, Ga, Ge, Ni, P, Pb, Sb, Si, Sn, Sr, Zn, Ti, Mg and Mn. The lithium metal composite negative electrode can be prepared through simple melting, tape casting and hot rolling, and is suitable for industrial production; the lithium metal composite negative electrode prepared by the preparation method has a conductive and lithium-loving double-gradient composite layer, and lithium deposition at the interface of the negative electrode and a diaphragm can be effectively inhibited. When the lithium metal composite negative electrode is used in the lithium metal battery, the energy density of the battery can be improved, the problem of negative electrode lithium dendrites can be effectively inhibited, and the long-acting stable circulation of the high-energy-density lithium battery can be realized.

The present invention relates to the technical field of lithium batteries, and in particular to a three-dimensional current collector, a preparation method thereof, and a lithium battery. The three-dimensional current collector comprises: a metal current collector substrate; a porous alloy layer located on the surface of the metal current collector substrate; the alloy layer comprises an M-X alloy component, where M is a metal element in the metal current collector substrate, and X is selected from elements that can react with lithium to form an alloy; a porous carbon layer located on the surface of the alloy layer; and the porous carbon layer is doped with C 3 N 4 The current collector of the present invention has a multiple three-dimensional porous structure, which provides a large amount of space for accommodating lithium deposition, can inhibit dendrite growth and alleviate volume expansion; and has good lithium affinity, can reduce the nucleation barrier and reduce the generation of dendrites; at the same time, the carbon layer on the surface of the current collector can improve the conductivity and reduce polarization on the one hand, and can avoid direct contact between lithium and electrolyte on the other hand, thereby improving the cycle stability of the current collector and the battery using the current collector and extending the service life.

The invention relates to the technical field of nanocarbon composite materials, and discloses a composite material and a preparation method and application thereof.The composite material comprises a carrier and Fe2O3 nanoparticles filled in the carrier, and the carrier is a nitrogen-oxygen co-doped carbon nanocage; wherein in the composite material measured by X-ray photoelectron spectroscopy, the molar content of carbon element is 75-98%, the molar content of oxygen element is 1-10%, the molar content of nitrogen is 0.5-5%, and the molar content of iron is 0.5-10%. The material has good lithium affinity and relatively low lithium deposition overpotential, and is beneficial to inducing metal lithium to enter a cage cavity for deposition. Precious metal or polymer materials are not needed, and the cost is low.

The invention discloses a lithium metal negative electrode and a preparation method thereof, and aims to solve the problems of performance degradation and safety of a lithium metal battery. The lithium metal negative electrode comprises a lithium metal strip and an artificial protection layer coating one side or two sides of the lithium metal strip; the artificial protective layer has a multi-layer structure and comprises a fluorinated polymer, a polyether polymer and a lithium salt layer, and the preparation method for the lithium metal negative electrode comprises the following steps and conditions: dissolving the polyether polymer in a solvent, stirring until the polyether polymer is completely dissolved, then adding a lithium salt, and uniformly stirring to obtain a precursor solution; adding the fluorinated polymer into a precursor solution, and heating and stirring until the polymer is completely dissolved and the solution is transparent to obtain a polymer solution; the lithium metal negative electrode has the advantages that the air stability is good, the lithium metal is uniformly deposited, the corrosion of the electrolyte to the lithium metal is thoroughly eliminated, and the lithium metal negative electrode is suitable for batch preparation of an existing lithium battery production line.

The invention relates to the technical field of metal lithium batteries, and discloses a metal lithium negative electrode active material and a preparation method thereof, a metal lithium negative electrode and a metal lithium battery, the negative electrode active material comprises metal lithium and a Fe2O3-carbon composite material; wherein the Fe2O3-carbon composite material comprises a nitrogen and oxygen co-doped carbon nano cage and Fe2O3 nano particles, and the nitrogen and oxygen co-doped carbon nano cage is filled with the Fe2O3 nano particles; wherein in the Fe2O3-carbon composite material measured by X-ray photoelectron spectroscopy, the molar content of a carbon element is 75-98%, the molar content of an oxygen element is 1-10%, the molar content of nitrogen is 0.5-5%, and the molar content of iron is 0.5-10%. The metal lithium negative electrode active material is applied to a metal lithium battery, and has relatively high specific capacity, good cycling stability and high coulombic efficiency.

The present invention provides a method for preparing a self-supporting porous nitrogen-doped graphene network lithium metal main material, comprising the following steps: step 1: dispersing graphene oxide in deionized water, ultrasonically dispersing to form a suspension, and obtaining a graphene oxide suspension; step 2: adding reduced red F3B dye to the suspension obtained in step 1, ultrasonically and uniformly stirring to obtain a mixed solution; step 3: pouring the mixed solution of step 2 into a template, putting it into an oven to self-assemble into a film through a liquid-gas interface, and obtaining a self-supporting composite film; step 4: heat-treating the composite film of step 3 under a protective atmosphere to obtain a self-supporting porous nitrogen-doped graphene network lithium metal main material. The present invention realizes the high rate performance of lithium metal batteries, promotes the development of lithium metal batteries, and provides a new self-supporting lithium metal main material for rapid charging and discharging, which is simple to operate and can be prepared on a large scale.

The invention discloses a preparation method and application of a ferromagnetic high-entropy alloy / carbon sphere composite material modified metal lithium negative electrode current collector, and relates to a preparation method and application of a metal lithium negative electrode current collector. The method comprises the following steps: 1, preparing hollow carbon spheres; 2, preparing a high-magnetism high-entropy alloy / carbon sphere composite material; and 3, modifying the metal lithium negative electrode current collector. The invention relates to application of a ferromagnetic high-entropy alloy / carbon sphere composite material modified lithium metal negative electrode current collector in a lithium metal battery. The obtained ferromagnetic high-entropy alloy / carbon sphere composite material modified metal lithium negative electrode current collector has a unique three-dimensional structure and has a relatively high electroactive specific surface area, so that impressed current can be uniformly distributed on a whole porous framework, and the effective current density is reduced, so that the distribution of an electric field around the framework is homogenized, and uniform deposition of lithium is facilitated; when the ferromagnetic high-entropy alloy / carbon sphere composite material obtained by the invention is used for modifying a metal lithium negative electrode current collector, the coulombic efficiency of a lithium negative electrode can reach 99.43%.

The application belongs to the technical field of lithium ion battery materials, and discloses a modified three-dimensional copper framework lithium battery negative electrode material combined with lithium metal and a preparation method thereof.The preparation method specifically comprises the following steps: (1) placing a copper mesh in a solution of citric acid and a lithium salt, heating and evaporating to dryness, and calcining under a protective atmosphere to obtain a pretreated current collector; (2) mixing the pretreated current collector with sulfur, selenium and a reducing agent in an organic solvent to perform a solvothermal reaction; and (3) immersing the electrode sheet after the solvothermal reaction in molten lithium metal in an argon glove box, and cooling, to obtain the modified three-dimensional copper framework lithium battery negative electrode material combined with lithium metal.The material prepared by the application has high structural stability, and the process is simple and easy to operate.The pretreatment of the copper mesh current collector increases the flatness of the deposited lithium, and improves the structural stability and electrochemical performance of the material.

The present application provides a negative electrode plate, a secondary battery, a battery module, a battery pack and an electric device. The negative electrode plate includes a coating layer and a current collector, the coating layer is located on at least one surface of the current collector, the coating layer includes a first coating layer and a second coating layer, the first coating layer is coated on the surface of the current collector, and the second coating layer is coated on the surface of the first coating layer, wherein the first coating layer includes nitrogen-doped graphite, the second coating layer includes at least one of nitrogen-doped graphite and non-nitrogen-doped graphite, and the total nitrogen content of the first coating layer is greater than the total nitrogen content of the second coating layer.

The invention provides a current collector with a three-dimensional porous structure on the surface, a preparation method and a battery. The preparation method comprises the following steps: firstly, obtaining a tin / copper foil with a three-dimensional structure on the surface through constant-current electrodeposition tin; then coating an indium tin seed layer on the tin surface of the three-dimensional structure through co-electrodeposition of indium tin, and on the basis, continuously performing constant-current electrodeposition of indium to obtain indium / indium tin / tin / copper foil with a three-dimensional porous structure on the surface; and finally, enabling the indium / indium tin / tin / copper foil to form an alloy by adopting a heat treatment technology so as to obtain the current collector with a walnut-shaped three-dimensional porous structure on the surface. Therefore, the lithium nucleation overpotential can be reduced, and the uniform deposition of lithium is guided, so that the growth of lithium dendrites and the volume expansion of lithium metal are effectively inhibited.

This application provides a negative electrode current collector, comprising a substrate and a lithium alloy, wherein the lithium alloy is disposed on the surface of the substrate, the lithium alloy comprising lithium and a matrix material, wherein the atomic ratio of lithium in the lithium alloy is 30%-50%, and the plating weight of the lithium alloy is 2-3 g / m. 2 This application also provides a method for preparing the above-mentioned negative electrode current collector, a positive electrode sheet, a secondary battery, and an electrical device. The negative electrode current collector provided in this application is prepared by depositing the lithium alloy on the surface of the negative electrode current collector. In the lithium alloy, the atomic ratio of lithium is 30%-50%, and the plating weight of the lithium alloy is 2-3 g / m². 2 During the charging process of a secondary battery, lithium atoms can be oxidized into lithium ions and enter the electrolyte to replenish the lithium consumed by the formation of the solid electrolyte interphase (SEI) at the negative electrode of the lithium-ion battery. This helps to improve the quality of the SEI and thus improves the initial coulombic efficiency of the secondary battery.