144 results about "Interfacial impedance" patented technology

The application relates to the technical field of battery materials, and particularly discloses a silicon-oxygen negative electrode material, a preparation method and application thereof. The silicon-oxygen material is coated by adopting a'secondary ethyne carbon coating' process, the deposition conditions of ethyne cracking are accurately controlled, the fluorides remaining on the surface of the active substance are fully coated by the secondary carbon layer, direct contact between the fluorides and the electrolyte is isolated, and the high-temperature storage stability of the material is significantly improved. The battery prepared by adopting the material provided by the application has a highest high-temperature storage initial efficiency of 71%, and the high-temperature storage capacity retention rate of a comparative sample (fluoride exposure) without secondary ethyne carbon coating treatment is only 61%. It is shown that the growth range of the interface impedance of the material provided by the application is significantly reduced after high-temperature storage, and it is shown that the interface side reaction is effectively inhibited.

This invention belongs to the field of solid-state electrolyte technology, specifically providing a method for in-situ construction of polymer salt / inorganic filler heterogeneous interfaces in composite solid-state electrolytes and its application. This invention utilizes single-ion polymer side-chain anionic groups to simultaneously achieve in-situ sol-gel catalysis and lithium salt anion anchoring, generating a molecularly uniform composite polymer salt / inorganic filler heterogeneous interface in the electrolyte matrix. This solves key problems such as filler agglomeration, high interfacial impedance, and significant space charge layer in traditional mechanical blending, significantly improving lithium-ion transport efficiency and overall electrolyte performance. This method is simple, environmentally friendly, and suitable for the preparation of high-performance composite solid-state electrolytes.

The application provides a preparation method of a full-solid-state lithium battery electrolyte and an integrated battery for energy storage, and belongs to the technical field of lithium ion secondary batteries, and can at least partially solve the problems of insufficient comprehensive performance of solid-state electrolyte, large solid-solid interface impedance, poor cycle stability, poor high-voltage adaptability and high safety risk of existing full-solid-state lithium batteries, and the application comprises the following steps: preparing a polydopamine functionalized graphene oxide aqueous solution, preparing a lithiated polyionic liquid ethanol aqueous solution, preparing a Co-N-C dispersion, preparing an electrolyte film based on the above-mentioned solutions, then preparing a positive electrode and a negative electrode, sequentially stacking the positive electrode, the electrolyte film and the negative electrode, realizing close adhesion of the solid-solid interface through hot pressing, performing gradient heat curing treatment after assembly, finally adopting aluminum plastic film packaging to obtain an integrated battery. The integrated battery prepared in the application can effectively reduce the interface impedance, improve the cycle stability and high-voltage adaptability, reduce the safety risk, and optimize the comprehensive performance.

This invention provides a separator and a base membrane, the base membrane comprising a central region and a peripheral region adjacent to the central region, the peripheral region comprising a first region located above the central region and a second region located below the central region; a first coating coated on the central region of the base membrane; and a second coating coated on the first and second regions of the base membrane; the first coating comprising first ceramic particles, a first binder, and a wetting agent; the second coating comprising a fast ion conductor material, second ceramic particles, and a second binder; wherein the ceramic particles in the first coating constitute 80%~95% by mass in the second coating, the fast ion conductor material in the second coating constitutes 10%~30% by mass, and the thickness T2 of the second coating is greater than the thickness T1 of the first coating. The separator of this invention can significantly improve interfacial contact performance, reduce interfacial impedance, and avoid puncture damage to the separator from the electrode edges; it also solves the problem of insufficient electrolyte wetting in the central region.

This invention provides an anode material, its preparation method, and its application. The anode material includes a silicon-carbon material and a modified coating layer covering the surface of the silicon-carbon material. The silicon-carbon material includes a core and a carbon layer covering the surface of the core. The core includes porous carbon and silicon deposited in the pores of the porous carbon. The modified coating layer, in the direction away from the silicon-carbon material, sequentially includes a first coating layer and a second coating layer. The first coating layer is made of tin and tin sulfide, and the second coating layer is made of a tin-modified sulfide solid electrolyte. Tin compensates for irreversible capacity loss and improves first-time efficiency. Tin and tin sulfide have high ionic conductivity, and the "point-to-surface" conductive network formed by tin and the carbon layer can significantly reduce interfacial resistance. The plasticity of the tin-modified sulfide solid electrolyte itself can optimize the interfacial contact between the anode and the electrolyte, reduce interfacial impedance, and buffer the volume expansion stress of the silicon material during charging and discharging. The synergistic effect of the above structures can effectively suppress the volume expansion of the silicon material.

The application relates to the technical field of batteries, in particular to a pole piece, a battery containing the pole piece, a battery preparation method and electronic equipment. The pole piece comprises a current collector and an electrode active material layer arranged on at least one surface of the current collector, the electrode active material layer has a porous structure, the electrode active material layer comprises an electrode active material, a binder and an interface modifier, the interface modifier comprises a fluorine-containing chain segment and an anchoring group used for anchoring on the surface of the electrode active material. The pole piece can improve electrode-electrolyte interface wettability and reduce interface impedance.

The application discloses a high-ionic-conductivity sulfide solid electrolyte, a preparation method and application thereof, and relates to the following steps: performing pressure treatment on LPSCI raw material powder, maintaining a certain pressure and pressure time, and obtaining the high-ionic-conductivity sulfide solid electrolyte. The high-ionic-conductivity sulfide solid electrolyte is prepared through high pressure, the improved dislocation density and reduced interface impedance in the high-ionic-conductivity sulfide solid electrolyte can be maintained at normal temperature and normal pressure, and the preparation process does not need heating and pressure transmission substances, and the method is simple, safe and reliable.

This invention discloses a method for preparing a polymer solid electrolyte with positively charged groups, comprising: S1. mixing polymer monomers, initiators, polymerizable ionic liquids, and lithium salts, and stirring to obtain a uniform solution; the lithium salt concentration in the solution is in the range of 0.1–10 M, and the mass percentage of the polymerizable ionic liquid is 0.01%–20%; S2. casting the solution onto a foil and solidifying it to form a solid electrolyte, or directly assembling it in situ into a battery in the solution state, and finally heating it at high temperature to solidify it to form a solid electrolyte. This invention utilizes the excellent wettability of the polymer monomers and the precursor liquid of the cationic polymerizable ionic liquid, combined with in-situ polymerization technology, to deeply penetrate into the pores of the high-load positive electrode, thereby constructing a continuous and efficient ion transport network, significantly reducing interfacial impedance, and improving the coulombic efficiency and cycle life of the solid-state battery. The overall process is simple, easy to operate, and highly compatible with existing processes.

This invention discloses a solid-state battery and its fabrication method, as well as a battery module. The solid-state battery includes several stacked battery cells connected by a shared bipolar current collector. The bipolar current collector includes a three-dimensional cross-linked carbon fiber film, which has a first surface and a second surface arranged opposite to each other. A composite positive electrode layer is formed on the first surface, comprising a positive electrode active material layer and a positive electrode protective layer. A composite negative electrode layer is formed on the second surface, comprising a negative electrode active material layer and a conductive buffer layer. The positive electrode protective layer comprises Li3PO4, and the conductive buffer layer comprises PEDOT-PSS. By using the three-dimensional cross-linked carbon fiber film as the bipolar current collector and setting the positive electrode protective layer and conductive buffer layer on the positive and negative electrode active material layers respectively, the energy density of the solid-state battery can be improved while reducing the interface impedance, thereby improving safety performance and extending cycle life.

This invention discloses a high-performance, safe solid-state battery based on a three-dimensional metal mesh framework and a negative electrode coupler, belonging to the field of solid-state battery technology. The invention employs a three-dimensional metal mesh conductive framework with a thin insulating ion-conducting interface coated on its surface. A four-layer integrated negative electrode coupler is disposed on the negative electrode side, consisting of a metal current collector layer, a negative electrode active layer, a critical thin film layer, and an electrolyte connection layer, from the inside out. The three-dimensional framework and the current collector layer constitute an integrated large current collector system, achieving spatial decoupling of electron and ion pathways. The three-dimensional metal framework possesses an ultra-large specific surface area, which, combined with the ultra-thin interface layer, forms a short ion transport path, achieving high ion conductivity, low interface impedance, and forming a complete logical closed loop with high energy density. The critical thin film layer uses a formulation below the percolation threshold to achieve ion conduction and electron blocking, suppressing lithium dendrites and internal short circuits. The positive electrode uses a high-nickel ternary material and can be modified with graphene and carbon nanotubes. This invention exhibits outstanding safety performance, strong process robustness, and suitability for mass production, and can be widely used in automotive, energy storage, and special power supplies.

This application relates to a composite solid-state electrolyte and an all-solid-state lithium-ion battery. The composite solid-state electrolyte comprises a polymer matrix, a sulfide inorganic filler, a lithium salt, and an interface modifier in a mass ratio of (40~50):(30~40):(15~20):(1~3). The solution provided in this application can simultaneously solve the technical problems of limited energy density, low ionic conductivity, high interfacial impedance between the positive and negative electrodes and the electrolyte, and short cycle life.

This invention belongs to the field of new energy batteries and relates to a method for protecting lithium metal anodes. It utilizes a chemical etchant to etch lithium metal or lithium alloys through a mild chemical reaction, generating a highly stable, tightly bonded solid electrolyte interface layer containing borides, fluorides, sulfides, etc., on the surface of the lithium metal or lithium alloy. This effectively suppresses side reactions between the electrode and the electrolyte, reduces interface impedance, and improves interface stability. The chemical etching strategy employed preferentially etches the high-chemical-energy crystal faces of lithium while retaining crystal faces with high electrochemical activity and low chemical energy, thus improving the reaction kinetics of the lithium metal anode. The resulting three-dimensional surface structure effectively buffers volume changes during metal deposition and stripping, avoiding surface fractures, trenches, pulverization, dendrite formation, and other problems that occur during long-term cycling, ensuring the integrity of the anode structure and cycle stability, thereby improving the cycle performance of lithium metal batteries and extending their service life.

The application provides a sodium ion battery negative electrode slurry which can be coated on an aluminum foil with a low dyne value, a preparation method of the sodium ion battery negative electrode slurry, a negative electrode sheet and a sodium ion battery, and relates to the field of sodium ion battery preparation. The sodium ion battery negative electrode slurry comprises, calculated based on the total mass of solid raw materials of the sodium ion battery negative electrode slurry being 100%, hard carbon 90-96%, a first conductive agent 0.5-3%, a second conductive agent 0.5-3%, modified butadiene styrene rubber 1.2-3.5%, and sodium carboxymethyl cellulose 0.5-1.8%; wherein the substituent group of the modified butadiene styrene rubber comprises a carboxyl group. In the coating and drying process of the negative electrode slurry provided by the application, the SBR floating problem can be effectively inhibited, the interface impedance caused by the SBR negative electrode on the surface of the negative electrode coating is prevented from being increased, and the rate capability of the battery cell is reduced.

The application relates to a battery and a preparation method thereof. The battery comprises a shell and an electrode assembly located in the shell, the electrode assembly comprises a positive electrode sheet and a negative electrode sheet, the surface layer of the negative electrode sheet on the side facing the positive electrode sheet is an artificial solid electrolyte film, the artificial solid electrolyte film comprises a solid electrolyte and a film-forming agent, the film-forming agent can react with lithium ions to generate the solid electrolyte, and the residual mass ratio of the film-forming agent in the artificial solid electrolyte film is 1.1%-5%. In this way, the lithium ion migration dynamics of the whole region of the negative electrode can be optimized through the artificial solid electrolyte film, the lithium ion deintercalation rate of different regions of the negative electrode sheet is balanced, and the problem of lithium precipitation in the local region of the negative electrode is reduced. Meanwhile, the residual small amount of the film-forming agent is uniformly distributed in the artificial solid electrolyte film, the interface impedance of the negative electrode active material layer in the negative electrode sheet is reduced, the migration of lithium ions is further promoted, the internal resistance of the battery is preferably reduced, and the cycle performance of the battery is improved.

This application discloses an in-situ polymerized amide-based polymer with polysulfide anionic terminal groups, its preparation method, and its application. Using DMAA as the monomer and NaOTF as the sodium salt source, anionic polymerization is carried out under the initiation of polysulfide anions to obtain PDMAA oligomers with terminal polysulfide anionic groups. After battery assembly, in-situ polymerization is used to construct a continuous organic sulfur amorphous phase and a flexible polymer network in the electrode and separator regions, achieving the fixation of polysulfide terminal groups and NaOTF. + The electrolyte primarily utilizes single-ion conduction; a sulfur-containing SEI protective layer is formed on the sodium metal surface to inhibit dendrite growth and reduce interfacial impedance. After 500 cycles at 0.2 C rate, the coulombic efficiency of the full cell is greater than 99.9%. The ion conduction efficiency and interfacial stability of the solid electrolyte are synergistically improved through the design of polysulfide anion end groups and in-situ polymerization strategy. The process is simple and low-cost, making it suitable for the large-scale application of high-safety, long-life solid sodium metal batteries.

The invention discloses a battery fiber of an ultraviolet curing electrolyte as well as a preparation method and application of the battery fiber. The battery fiber comprises an electrode fiber core, a gel electrolyte layer and a polymer encapsulation layer from inside to outside. The electrode fiber core is formed by twisting and compounding a positive electrode fiber and a negative electrode fiber; the gel electrolyte layer is formed by curing a precursor containing a photocuring monomer, a photoinitiator, a linear polymer and a lithium salt through ultraviolet irradiation. According to the preparation method, a stable gel electrolyte layer is rapidly constructed on the surface of the fiber at normal temperature through an ultraviolet curing technology, so that the potential safety hazard that a traditional liquid electrolyte is easy to leak is solved, an electrode-electrolyte interface is also remarkably optimized, and the interface impedance is reduced. The obtained battery fiber has excellent flexibility, high safety and good electrochemical performance, the slender one-dimensional form of the battery fiber can be directly woven into an intelligent fabric through a textile technology, and an ideal flexible embedded power supply solution is provided for wearable electronic equipment.

This application relates to the technical field of sulfide solid electrolyte membranes, their preparation methods, and solid-state batteries. The sulfide solid electrolyte membrane includes a composite support and a gradient-doped electrolyte layer for forming at least one surface of the composite support. The composite support includes boron-doped cellulose nanofibers and boron nitride nanosheets dispersed in the boron-doped cellulose nanofibers. The gradient-doped electrolyte layer is a sulfide solid electrolyte layer with a doping concentration varying along the direction away from the composite support. This application achieves a balance between high ionic conductivity and interfacial stability through a gradient-doped structure, enhances the mechanical strength of the electrolyte membrane and reduces interfacial impedance using in-situ crosslinking technology, and ensures good mechanical and thermal properties while achieving ultra-thinness through the use of a functionalized composite support.

A method for improving the Li / LATP interface stability in LATP-based solid-state lithium metal batteries belongs to the field of electrolyte interface modification for solid-state lithium metal batteries. This includes: 1) preparing NASICON-type Li using a cold-pressing sintering method. 1.3 Al 0.3 Ti 1.7 1) A (PO4)3 (LATP) solid electrolyte ceramic sheet was prepared; 2) A PVDF-HFP / LiTFSI / GaF3 (PVGa) composite modified layer precursor solution was prepared; 3) The precursor solution was uniformly coated on both sides of the LATP ceramic sheet using a solution drop coating method, and after vacuum drying, a LATP@PVGa modified electrolyte with a PVGa composite intermediate layer on the surface was obtained; 4) A solid lithium metal battery was assembled using a high-purity lithium sheet as the negative electrode and LATP@PVGa as the electrolyte, matched with a positive electrode. By constructing a flexible multifunctional PVGa composite intermediate layer on the LATP surface, the synergistic optimization of physical contact, chemical stability and electrochemical deposition behavior of the Li / LATP interface was achieved, solving the problems of poor compatibility between LATP and lithium metal negative electrode, high interface impedance and easy formation of Ti. 4+ The core bottlenecks of reduction side reactions and lithium dendrite growth have been overcome, improving interfacial cycle stability and battery electrochemical performance. The process is simple and can be scaled up.

This invention relates to a high-interfacial-wetting cathode material and its preparation method in the field of thermal battery technology. The material comprises a cathode active material and a halide cathode additive, wherein the halide cathode additive accounts for 5% to 20% by mass. The cathode active material is a sulfide cathode, including one or more of FeS2, CoS2, and NiS2. The halide cathode additive is a metal halide, including one or more of nickel chloride, cobalt chloride, nickel fluoride, and copper fluoride. This solution significantly reduces the interfacial impedance between the cathode and the electrolyte, improving power performance and discharge capacity.

This invention provides a coated and modified ultra-high nickel cathode material and its preparation method, belonging to the technical field of lithium-ion battery cathode materials. The coated and modified cathode material includes ultra-high nickel cathode material particles and a composite coating layer covering its surface. The coating layer consists of a Mg and F dual-doped sulfur chloride solid electrolyte, Li. 4.3 AlS 3.3 Cl 0.7 It is composed of Mg and conductive carbon black (CB). 2+ The introduction of Mg and F can regulate the lattice structure and enhance the lithium-ion migration rate. F⁻ doping can improve the Al-S bond energy and chemical stability, thereby forming a highly stable ion conduction network. The introduction of conductive carbon black constructs a continuous electronic conduction pathway, realizing the synergistic transport of ions and electrons. Through the above composite coating, the interfacial side reactions between the ultra-high nickel cathode and the electrolyte can be significantly suppressed, while reducing the growth of interfacial impedance, suppressing oxygen release and lattice collapse under high temperature and high pressure, thereby improving the cycle stability of the material. The Mg and F dual-doped Li₂ provided by this invention 4.3 AlS 3.3 Cl 0.7 The / CB coating modification scheme provides an efficient and feasible new approach for high-energy-density lithium-ion battery cathode interface engineering.

The application discloses an iridium oxide modified fluorine-doped tin oxide electrode and a preparation method and application thereof. The electrode comprises a light-transmitting fluorine-doped tin oxide conductive glass substrate and an in-situ attached iridium oxide nano-modified layer. The preparation method comprises the following steps: preparation and aging of a precursor solution, alternating current electrochemical deposition, annealing and cleaning, and laser patterning treatment. The application further discloses a cell impedance sensor organ chip system comprising the electrode and application of the system in in-vitro drug screening. The application utilizes the low cost and light-transmitting property of the fluorine-doped tin oxide and the excellent charge injection capacity of the alternating current deposited iridium oxide nano layer to greatly reduce the interface impedance. The scheme meets the in-situ optical observation, realizes the high-sensitivity biological impedance monitoring comparable to gold electrodes, effectively solves the problems of high cost and complex process of the existing organ chip electrode, and is very suitable for popularization and application as a disposable high-throughput consumable.

This application relates to a negative electrode sheet, a battery cell, and a negative electrode sheet fabrication process, belonging to the field of battery manufacturing technology. The negative electrode sheet includes a current collector and an active material layer. The current collector is used to collect and conduct charge. The active material layer includes at least two active layers, which are sequentially stacked and adhered to the current collector. Specifically, towards the side away from the current collector, the proportion of secondary particles in the active material of the active layers sequentially increases, the content of binder in the active layers sequentially decreases, and the proportion of high-modulus binder in the binder sequentially decreases. The negative electrode sheet provided by this application can improve problems such as wrinkles that occur in the negative electrode sheet due to increases in battery energy density and rate performance, thereby avoiding problems such as increased interfacial impedance and lithium plating caused by wrinkles, and extending the battery's lifespan.

This invention discloses a solid electrolyte, its preparation method, and its application, relating to the field of battery technology. The raw material components of the solid electrolyte include comonomers, lithium salts, and initiators. The comonomers include chain acrylate monomers containing ether bonds and cyclic carbonate monomers. The solid electrolyte provided in this application can solve the technical problems of existing technologies, such as the flammability and leakage hazards of traditional liquid electrolytes, the difficulty in balancing ionic conductivity and flexibility with high interfacial impedance in existing polymer electrolytes, and the complex and inefficient preparation processes.

This invention relates to the field of solid-state electrolyte battery technology, specifically to a 4D-printed gel solid-state electrolyte, a printing method, and a solid-state battery. This application utilizes 3D printing technology to pre-construct a solid-state electrolyte composed of an insoluble polymer framework and a soluble polymer functional phase. When a trace amount of electrolyte is introduced, this structure undergoes a predetermined, controllable evolution over time—the soluble components rapidly dissolve and gel in situ, dynamically coating the surface and pores of the insoluble framework, thereby forming a gel electrolyte that combines a stable three-dimensional framework with a high ionic conductivity gel interface layer. This achieves a 4D-printed gel solid-state electrolyte. This 4D-printed gel solid-state electrolyte effectively buffers volume changes and significantly reduces interfacial impedance. Simultaneously, its insoluble framework ensures mechanical strength and dimensional stability, while the extremely low electrolyte usage fundamentally improves battery safety and cycle performance.

The application discloses a kind of double-layer solid electrolyte membrane for solid-state lithium battery and preparation method thereof, belong to solid-state lithium ion battery technical field. Including coating on the surface of battery positive pole piece solid electrolyte film A and coating on the surface of battery negative pole piece solid electrolyte film B, the solid electrolyte film A is composed of polymer solid electrolyte A, inorganic solid electrolyte and lithium salt, the solid electrolyte film B is composed of polymer solid electrolyte B, inorganic solid electrolyte, lithium salt and conductive agent. The application effectively improves the ion conductivity of solid electrolyte membrane, reduces the interface impedance of solid electrolyte membrane / electrode piece, adjusts current density, prevents lithium dendrite, improves the electrical performance and safety performance of solid-state lithium battery, and is convenient for use.

This invention provides a concrete composite electrode and a continuous-interface all-solid-state cement-based supercapacitor, along with their fabrication method. The method includes preparing a conductive cement-based electrode slurry, preparing an ion-transporting cement-based membrane slurry, placing a current collector within the conductive cement-based electrode slurry to form two concrete composite electrodes, and then placing and in-situ curing a cement-based membrane layer between the two concrete composite electrodes. After curing, a continuous-interface all-solid-state cement-based supercapacitor is obtained. This supercapacitor can operate directly after curing without further soaking, enabling the integral construction of the electrode layer, membrane layer, and current collector, reducing interlayer impedance, and improving the overall integrity and structural continuity of the device.

This invention belongs to the field of solid polymer electrolyte technology, specifically relating to a conductive and flame-retardant polymer solid electrolyte, its preparation method, and its application. The preparation method involves first dissolving chopped aramid fibers in an organic solvent and then leaching them to obtain an ANF membrane; then coating the surface of the ANF membrane with an EG / PEO / LiTFSI electrolyte solution and vacuum drying to obtain an EG / PEO@ANF composite solid electrolyte. ANF can reduce the crystallinity of PEO and improve the crystallinity of Li... + Migration behavior in solid electrolytes; as a reinforcing framework, it effectively improves the mechanical strength and thermal stability of solid electrolytes and inhibits the growth of lithium dendrites; the introduction of EG as a flame-retardant filler significantly improves the thermal safety performance of solid electrolytes under high temperature or combustion conditions; it can also distribute charges uniformly in the electrolyte through its conductivity, suppress the phenomenon of excessively high local current density, improve the contact of the electrode / electrolyte interface, reduce the interface impedance, and effectively improve the ionic conductivity of the battery.

The application relates to the technical field of battery materials, and discloses a lithium secondary battery positive electrode coating material as well as a preparation method and application thereof. 3+z Nb 1‑ x M x O 4‑y R y wherein M is selected from one of Fe, Ti, Mn, Mo, W, V, Ta and Cr; R is selected from one of F, Cl, Br and I; 0<=x<1, 0<=y<=4, and the values of x, y and z satisfy the charge balance of the positive electrode coating material. The application integrates the triple functions of thermodynamic interface protection, fast ion conduction and charge compensation in a single material through cation, anion or anion-cation co-doping design based on Li3NbO4 as a matrix; the positive electrode coating material can significantly reduce the solid-solid interface impedance in a full solid-state battery, improve the first circle coulomb efficiency, and greatly improve the long cycle stability of an electrode; meanwhile, the positive electrode coating material can effectively inhibit the decomposition of high-voltage electrolyte in a traditional liquid battery, and improve the cycle life of a positive electrode material.