48results about How to "Inhibition of lithium dendrites" patented technology

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.

The invention belongs to the related field of polymer electrolyte systems. The invention discloses a single-ion polymer electrolyte system as well as a preparation method and application thereof. Thesingle-ion polymer electrolyte system is composed of a single-ion polymer electrolyte and a metal salt, wherein the single-ion polymer electrolyte is obtained by carrying out reversible addition-fragmentation chain transfer polymerization reaction on three monomers including a single-ion conductor lithium salt containing a p-styrenesulfonyl group, UPyMA containing quadruple hydrogen bonds and methoxypolyethylene glycol methacrylate. According to the invention, the key structure and related composition in the single-ion polymer electrolyte system, the overall process flow of the preparation method and other aspects are optimally designed; and, compared with the prior art, the invention is advantageous in that not only can the phenomenon that a polymer electrolyte system is easy to crack bebetter solved, but also the metal ion transference number and the ionic conductivity can be remarkably improved, and meanwhile, the growth of metal dendrites is effectively inhibited, so that the polymer electrolyte is particularly suitable for the field of metal ion batteries such as lithium ion batteries.

The invention provides a lithium-supplementing negative electrode and application thereof. The lithium-supplementing negative electrode comprises a negative electrode current collector, a negative electrode active layer arranged on at least one functional surface of the negative electrode current collector and a lithium-supplementing layer arranged on the surface of the negative electrode active layer, wherein the lithium-supplementing layer comprises lithium powder and a lithium ion conductive agent. The lithium-supplementing negative electrode not only can efficiently supplement the active lithium loss of the lithium ion battery, but also can greatly reduce the lithium precipitation risk caused by lithium supplementation, thereby ensuring the cycle performance and safety of the lithium ion battery in the long-term application process.

The invention discloses an all-solid-state lithium battery and a preparation method thereof. The all-solid-state lithium battery comprises a positive electrode, a negative electrode, a ceramic electrolyte layer and polymer solid electrolyte dispersed on the surfaces and gaps of the positive electrode, the negative electrode and the ceramic electrolyte layer, wherein the positive electrode comprises a positive electrode collector and a positive electrode layer attached to the surface of the positive electrode collector, the positive electrode layer comprises a positive electrode active material, and the surface of the positive electrode active material is coated with a high-voltage-resistant ceramic electrolyte; the negative electrode comprises a negative electrode collector and a surface modification layer attached to the surface of the negative electrode collector, and the surface modification layer comprises a carbon material and a binder. The ceramic electrolyte layer comprises a low-voltage-resistant ceramic electrolyte and a polymer binder; the coating can be independently layered or attached to the surface of a positive electrode; the polymer solid electrolyte comprises a polymer phase and a lithium salt dispersed in the polymer phase. The all-solid-state lithium battery disclosed by the invention has excellent safety performance, high energy density and excellent cycle stability.

The invention provides a lithium bis(fluorosufonyl)imide/1, 3-dioxolane lithium battery gel electrolyte, a preparation method thereof and a battery and belongs to the technical field of lithium batteries. The preparation method comprises taking lithium bis(fluorosufonyl)imide and 1, 3-dioxolane as precursors to dissolve and uniformly mix the lithium bis(fluorosufonyl)imide inside the 1, 3-dioxolane, and ensuring the concentration of the lithium bis(fluorosulfonyl)imide in the mixed solution is 3-4 molL<-1>; standing the mixed solution in a sealed state so that the 1, 3-dioxolane can be gradually polymerized under the catalytic effects of the lithium bis(fluorosulfonyl)imide to form the lithium bis(fluorosufonyl)imide/1, 3-dioxolane lithium battery gel electrolyte. The lithium bis(fluorosufonyl)imide/1, 3-dioxolane lithium battery gel electrolyte has the advantages of being wide in electrochemical window, stable in effects on lithium negative electrodes, good in lithium dendrite growthinhibiting effects and the like, and can greatly improve the circulating efficiency of the lithium negative electrodes. Meanwhile, the lithium bis(fluorosufonyl)imide/1, 3-dioxolane lithium battery gel electrolyte is simple in preparation, low in price of raw materials and energy and applicable to large-scale industrialized production as well as to lithium batteries with various positive electrodematerials such as lithium-sulfur batteries, lithium-lithium ion phosphate batteries, lithium-lithium cobalt oxide batteries and lithium-air batteries.

The invention discloses a composite electrolyte and application thereof, the composite electrolyte comprises a gel electrolyte coated on a lithium negative electrode and a quasi-solid electrolyte coated on a positive electrode, and the gel electrolyte is in contact with the quasi-solid electrolyte; electrolyte is adsorbed in the quasi-solid electrolyte; both the gel electrolyte and the quasi-solidelectrolyte contain the same conductive lithium salt; the invention also discloses application of the composite electrolyte to a lithium ion battery. According to the invention, through cooperation of the two electrolytes, lithium dendrites are inhibited, and the composite electrolyte is ensured to have good conductivity.

The invention relates to a lithium metal interface modification method for a room-temperature solid-state battery, which comprises the steps of S1, adding PEO, LLZTO and a lithium salt into an organicsolvent in an oxygen-free atmosphere to assemble a battery with a negative electrode and a composite electrolyte; and S2, adding an LITFSI/AN solution between the negative electrode of the battery and the composite electrolyte, modifying lithium by using LITFSI, and drying. By adopting the method provided by the invention, the lithium metal interface modification method for the solid-state battery can be provided, lithium dendrites can be inhibited according to the method, the interface impedance can be effectively reduced, and the solid-state battery can work at room temperature. The methodhas the beneficial details that solid-state battery configuration design is performed on a solid-state battery which is high in interface impedance and cannot work at room temperature, so that the electrochemical performance of the solid-state battery is effectively improved.

The invention discloses an ionic plastic crystal-polymer-inorganic composite electrolyte membrane and a preparation method and application thereof. The ionic plastic crystal-polymer-inorganic composite electrolyte membrane comprises a porous organic-inorganic composite membrane and an ionic plastic crystal electrolyte composite material, the porous organic-inorganic composite membrane has a continuous three-dimensional network structure, the ionic plastic crystal electrolyte composite material is distributed on the surface of the three-dimensional network structure and/or in contained holes, and the ionic plastic crystal electrolyte composite material comprises an ionic plastic crystal compound and a lithium salt. The ionic plastic crystal-polymer-inorganic composite electrolyte membrane disclosed by the invention has the advantages of simple preparation process, excellent mechanical strength, high ionic conductivity, wide electrochemical stability window, lithium dendritic crystal inhibition, high temperature resistance, flame retardance and the like.

The invention discloses a lithium air battery based on a lithium alloy negative electrode. The lithium air battery using lithium alloy as a negative electrode is placed in an anhydrous gas atmospherefor at least one cycle of high current pretreatment, wherein the current density of the high current pretreatment is not less than 0.8 mAh.cm<-2>. An oxide film composite SEI protective film containing heterogeneous metal is formed on the surface of the battery through high current pretreatment before normal cycle test, so that the erosion of the electrolyte, water, dissolved oxygen and carbon dioxide in the lithium air battery on the negative electrode can be blocked, the lithium ions can be guided to be uniformly deposited on the surface of the negative electrode, the occurrence of lithium dendrites can be inhibited, and the cycle stability and safety of the battery are greatly improved.

The invention relates to the field of lithium metal air batteries, in particular to a copper magnetic current collector, a preparation process thereof and a magnetic lithium air battery containing thesame. Surface modification is performed on a material with the permanent magnetic property to obtain a negative electrode material of a lithium air battery with large specific surface and high catalytic activity. According to the invention, the mass transfer process of oxygen is enhanced through the micro magnetic field, the concentration of active oxygen on the positive electrode surface is improved by the paramagnetic property of oxygen, the magnetohydrodynamics effect, the magnetization force effect and the like produce disturbance on the electrolyte, so that the reaction activity of the gas-liquid-solid three-phase interface is increased, the polarization is reduced, non-uniform deposition of the negative electrode metal lithium is improved, and the lithium dendrites are inhibited; the catalytic activity of the bifunctional catalyst is increased and the over-potential is reduced by the electric field generated by the copper layer structure; by the structure field energy, the volume change stress is released, the expansion space is provided, a uniform reaction active site and the like are provided, and the overall electrochemical performance is fully improved.

The invention provides a solid-state lithium air battery. The battery comprises a lithium negative electrode, an electrolyte, an air positive electrode and a packaging shell with an opening and closing function, wherein the electrolyte comprises an electrolyte with a curing function and a diaphragm, the lithium negative electrode, the diaphragm, the air positive electrode and the packaging shell form an accommodating cavity for accommodating the electrolyte, the air positive electrode is connected with the diaphragm, and the diaphragm is a porous film; the electrolyte at least comprises a polymeric monomer and a lithium salt, and the concentration of the lithium salt in the electrolyte is 0.2-7 mol/L. The battery is advantaged in that a polymer or a protective layer can be formed on the surface of the lithium negative electrode through in-situ solidification of the electrolyte, the protective layer can inhibit lithium dendrites, uniform deposition of lithium ions on the negative electrode is achieved, meanwhile, the effect of a gas protective layer is achieved, and direct reaction of oxygen, water, carbon dioxide and other gases with the lithium negative electrode is isolated; besides, after the electrolyte is subjected to in-situ polymerization to form a polymer, a problem of electrolyte volatilization of a liquid system of a traditional lithium-air battery can be solved, so the service life of the lithium-air battery is prolonged, and use safety of the lithium-air battery is improved.

The invention relates to the technical field of electrode materials, and in particular, relates to a lithium metal electrode and a preparation method and application thereof. A three-dimensional network structure in the lithium metal electrode provided by the invention can effectively accelerate charge transfer and reduce interface resistance; compared with a pure lithium electrode, the specific surface area is large, relatively low local current density can be generated, charge distribution is uniformized, when Li is deposited, a smooth effect is achieved and the growth rate is reduced, an Al2O3 layer and a Li3PO4 layer can accommodate the volume expansion of a battery in the cycle process, the preferential deposition of lithium ions is reduced and the uniform deposition of the lithium metal surface is promoted, so that lithium dendrites are effectively inhibited, the stability of the battery is improved, and the cycle life of the battery is prolonged; the structural characteristics of the lithium metal electrode provided by the invention can reduce the internal stress and interface fluctuation of the material, thereby improving the overall mechanical stability and integrity of the battery.

The invention relates to a preparation technology of lithium ion battery electrolytes, and aims to provide a preparation and application method of a composite single-ion solid electrolyte. The methodcomprises the steps of: taking p-styryl fluoro alkyl sulfimide lithium, acrylate polyether, nitrile imidazole type ionic liquid and a silane coupling agent KH-570, and performing free radical polymerization under the stirring condition and the initiation of ultraviolet light to prepare a copolymer; uniformly dispersing the copolymer and an inorganic nano material in a solvent to prepare a castingsolution; pouring the casting solution on a clean membrane-making glass mould uniformly, and transferring the membrane-making glass mould to a vacuum drying oven; and performing heating to completelyvolatilize the solvent, dehydrating, condensing and crosslinking the polymer to obtain a membranous composite single-ion solid electrolyte. The composite single-ion solid electrolyte obtained by the invention has the higher ionic conductivity and lithium ion transference number and good thermal stability and electrochemical stability, and has the excellent long-cycle performance and high-voltage resistance when used in a lithium ion battery; and moreover, the preparation method is simple and mild in condition and is capable of achieving large-scale production.

The invention discloses an electrolyte containing a positive electrode protecting agent and a lithium sulfur battery containing the electrolyte. The purpose of the positive electrode protecting agentused in the lithium sulfur battery is to solve the problems of poor cycle stability, poor discharge rate and poor safety performance existing in the prior lithium sulfur battery. The technical schemeis that a positive electrode protecting agent is added into the traditional electrolyte of the lithium-sulfur battery as the electrolyte of the lithium-sulfur battery. In the charge and discharge process of the battery, the protectant is combined with S-S bond bonding, which lowers the activation energy of S-S bond cleavage/binding, accelerates the rate of redox reaction, thus alleviating the shuttle effect of lithium polysulfide and improving the reversibility and cycling stability of active sulfur.

The invention discloses an organic-inorganic composite solid electrolyte film and a preparation method thereof, and a solid lithium metal battery based on the solid electrolyte film. The electrolyte film takes a polymer as a matrix skeleton, the matrix skeleton is filled with an ionic liquid and an inorganic ionic conductor, and the ionic liquid contains a lithium salt. The solid electrolyte filmis obtained by adopting a solution casting method; the preparation method is simple, and the solid electrolyte film has relatively high ionic conductivity (greater than 10<-4> S cm<-1>). Under the condition of room temperature, the current density is controlled to be 0.1 mA cm <-2>, the assembled symmetrical metal lithium battery can stably circulate for 1,350 circles, and the operation time is aslong as 2,700 hours; the assembled Li|LiFePO4 battery has good cycle performance, can stably circulate for 100 circles at 1C, and has specific capacity maintained at 110mAh g <-1> or above.

Disclosed is a solid polymer electrolyte comprising an amorphous polymer, the amorphous polymer is of a comb-like structure formed by copolymerizing monomer units; the monomer unit comprises a monomerunit with a polar group and a polyethylene glycol acrylate monomer unit. The invention also discloses a solid-state battery containing the solid-state polymer electrolyte and a preparation method ofthe solid-state battery. According to the solid polymer electrolyte disclosed by the invention, the amorphous polymer can improve the conduction speed of lithium ions and greatly improve the conductivity of the lithium ions. The high-dielectric structural unit (polar group) contained in the solid polymer electrolyte greatly enhances the oxidation resistance of the polymer electrolyte, widens the electrochemical window of the polymer electrolyte, and promotes the enhancement of chemical stability and electrochemical stability. Meanwhile, lithium dendrites can be inhibited, and oxygenolysis of the electrolyte is inhibited. The in-situ copolymerization of the solid polymer electrolyte and the high-dielectric structure unit can improve the interface performance of the electrode and the electrolyte.

The invention provides a five-block polymer, a preparation method and application thereof, and a five-block polymer electrolyte, and belongs to the technical field of polymer electrolytes. The five-block polymer provided by the invention contains a polypropylene oxide (PPO) block, so that ordered arrangement of the polyethylene oxide (PEO) block can be disrupted, and the crystallinity of the PEO block is reduced; meanwhile, the styrene block can inhibit lithium dendrites and improve the mechanical strength of the polymer electrolyte. Meanwhile, the five-block polymer provided by the invention also has the advantages of good film-forming property and high thermal stability. The result of the embodiment shows that when the penta-block polymer provided by the invention is used as the electrolyte of the lithium ion battery, the conductivity at 70 DEG C is 2.87 * 10 <-4 > S/cm, and the penta-block polymer has excellent rate capability; and the lithium ion transference number can reach 0.31 and is higher than 0.2 of the pure polyoxyethylene-based polymer electrolyte.