39results about How to "High ion conductivity" patented technology

The invention discloses a composite modification film, a lithium metal negative electrode and a preparation method of the lithium metal negative electrode. The composite modified film comprises an organic polymer solid electrolyte, an inorganic solid electrolyte and a film-forming agent, and the mass ratio of the organic polymer solid electrolyte to the inorganic solid electrolyte to the film-forming agent is (10%-35%): (10%-35%): (30%-80%). The composite modified film effectively buffers cyclic stress, prevents early mechanical failure of the protective layer, and realizes mechanical durability of the interface protective layer; the immobilized film-forming agent can be slowly released, so that the continuous and stable repair of SEI is realized, the dynamic repair capability of the whole life cycle is provided, and the efficient cycle life of the battery is greatly prolonged; and the electrolyte does not need to depend on a high-concentration liquid additive, dramatic change of electrolyte components in circulation is avoided, the overall chemical stability of the battery is improved, and the stability of an electrolyte system is guaranteed.

The application provides a high-nickel ternary material modification method and a high-nickel positive electrode material with a nitrogen-oxygen coating layer, and relates to the field of lithium ion batteries. In the high-nickel ternary material, surface lattice oxygen is gradually replaced by nitrogen atoms in a high-temperature long-time calcination process in a nitrogen-oxygen mixed atmosphere, so that a nitrogen-oxygen layer is formed on the surface, which is beneficial to the delocalization of electrons, thereby endowing the material with excellent electronic conductivity; meanwhile, the presence of the nitrogen-oxygen layer inhibits the transformation of the surface layer structure into a rock salt phase structure, which is beneficial to realizing efficient ion transport. The formation of the nitrogen-oxygen layer on the surface of the high-nickel ternary material can simultaneously improve the electronic and ionic conduction of the surface of the high-nickel positive electrode material, inhibit the interface side reaction, relieve the volume change, and thereby improve the cycle stability of the battery.

The application discloses a manganese iron lithium phosphate composite positive electrode material with Mn ion self-compensation and multiple interception functions and a preparation method thereof. The manganese iron lithium phosphate composite positive electrode material is composed of a manganese iron lithium phosphate positive electrode material and functional composite film micro-powder loaded on the surface and between the particles of the manganese iron lithium phosphate positive electrode material. The functional composite film of the functional composite film micro-powder is prepared from Na-merolite powder through Mn ion exchange, grafting and copolymerization, lithiumation and PVA composite film preparation. The manganese iron lithium phosphate composite positive electrode material is prepared from the manganese iron lithium phosphate positive electrode material and the functional composite film through mixing, crushing and freeze-drying. The manganese iron lithium phosphate composite positive electrode material realizes the inhibition of the dissolution of Mn 2+ in the manganese iron lithium phosphate positive electrode material from the source, improves the ion conduction performance and the cycle stability of the manganese iron lithium phosphate positive electrode material, and has the advantages of high capacity, long cycle life, high safety and the like.

The invention discloses a silicon negative electrode active material which sequentially comprises a silicon-based material inner core, a flexible solid electrolyte or gel electrolyte middle layer and a carbon-coated outer layer from inside to outside, the flexible solid electrolyte or gel electrolyte middle layer comprises a conductive agent, and the conductive agent comprises a carbon nanotube. According to the silicon negative electrode active material, the surface of the silicon-based material is coated with the flexible solid-state or gel-state electrolyte, so that the volume change of the negative electrode active material in the charging and discharging process is effectively relieved, the electrolyte is isolated, the stability of the negative electrode active material is improved, and the negative electrode active material has relatively high reversible specific capacity and relatively high specific surface area; and excellent long cycle performance is shown.

The invention belongs to the technical field of solid-state batteries, and discloses an alloy ion / electron mixed conductor and application thereof. The mixed conductor is prepared by taking antimony powder, lithium powder or sodium powder and at least one metal powder of lanthanum, scandium, yttrium, aluminum, gallium and indium as raw materials through ball-milling mixing, tube sealing annealing and quenching treatment. When the mixed conductor is used as an interlayer of a lithium / sodium metal negative electrode and an electrolyte in the solid-state battery, the growth of lithium / sodium dendrites can be effectively inhibited through a specific nucleation mechanism, and the utilization rate of the metal negative electrode is improved; when the conductive additive is used as a conductive additive of a silicon, red phosphorus or graphite / hard carbon negative electrode material, by virtue of high ion / electron conductivity and good potential stability, the interface side reaction is reduced, and the rate capability and the cycling stability of the negative electrode material are remarkably improved.

The invention belongs to the technical field of batteries, and particularly relates to a battery cell and a formation method thereof, an energy storage device and a power utilization device. The battery cell formation method comprises the following steps: executing multi-stage charging formation operation at a preset temperature: charging a to-be-charged battery cell with a first charging current until the to-be-charged battery cell increases a first charge state; charging with the second charging current to the Nth charging current in sequence until the state of charge reaches the target state of charge; the first charging current to the Nth charging current are gradually increased in sequence, and at least one of the second charging current to the Nth charging current is not less than 0.5 C. The formation time of the battery is obviously shortened, the production efficiency is improved, and the manufacturing cost is reduced; meanwhile, through the stepped current design and the temperature and pressure synergistic effect, the technical problems that electrolyte infiltration in a large-size battery cell is uneven and gas is difficult to discharge can be effectively solved, a more uniform and compact SEI film is formed, the consistency of the battery cell is improved, the cycle life of the battery cell is prolonged, and the safety performance of the battery cell is improved.

The application relates to the technical field of all-solid-state batteries, and particularly relates to a high-pressure-resistant solid electrolyte film, a preparation method thereof and an all-solid-state battery. The high-pressure-resistant solid electrolyte film comprises a modified porous non-woven fabric skeleton layer and halide-based solid electrolyte layers and sulfide electrolyte layers arranged on the two sides of the modified porous non-woven fabric skeleton layer respectively; the modified porous non-woven fabric skeleton layer comprises a porous non-woven fabric substrate and a polymer coated on the fiber surface; the halide-based solid electrolyte layer comprises a halide electrolyte and / or an oxyhalide electrolyte. The sandwich structure can improve the overall electrochemical stability window of the high-pressure-resistant solid electrolyte film, inhibit the electrolyte oxidation decomposition and interface side reaction under high pressure, improve the cycle life of the battery and the high-pressure working condition adaptability; and the modified porous non-woven fabric skeleton layer contains a polymer which has good interface compatibility with the halide-based solid electrolyte layer and the sulfide electrolyte layer and is easy to be hot-melt, thereby forming a composite electrolyte film with an integrated structure and greatly reducing the interface contact impedance.

The present invention relates to a sulfide solid electrolyte containing a sulfide-based glass phase, the sulfide-based glass phase having an exothermic peak at which a highly ion-conductive crystal is precipitated when subjected to differential scanning calorimetry at a temperature increase rate of 5 DEG C / min, the exothermic peak being separable into two or more peaks, and the number of the exothermic peaks being two or more. Among the two or more peaks obtained by peak separation, the temperature difference between the peak top of the highest-temperature-side peak and the peak top of the lowest-temperature-side peak is 0.5 DEG C or more.

The application provides a sodium ion battery positive electrode material and a preparation method and application thereof, the sodium ion battery positive electrode material comprises an active material and a hydrophobic coating layer, and a coating source of the hydrophobic coating layer comprises a siloxane-based compound; the siloxane-based compound is used as the coating source of the hydrophobic coating layer, a compound containing -Si-O-Na is generated on the surface of the active material, the hydrophobic property and the environmental stability can be ensured at the same time, and the sodium ion battery obtained has high ion conduction capacity, so that the sodium ion battery has good cycle performance; meanwhile, the application is coated by using a molecular self-assembly method, the thickness does not change due to the change of the morphology of the material, the process requirement is low, and the cost is low.

The invention discloses a high-voltage-resistant gel polymer electrolyte for a supercapacitor and a preparation method and application thereof, and belongs to the technical field of supercapacitors. In the electrolyte, the high-pressure-resistant additive, the auxiliary additive, the lithium salt and the mixed solvent are reasonably matched. The high-pressure-resistant additive contains two key functional groups, namely trifluorosulfonyloxy and cyano, so that a stable multifunctional protective layer can be constructed on the interface of the positive electrode and the negative electrode, and the problem of interface degradation is solved. According to the preparation method, additives and lithium salt are added step by step, a cross-linked structure is finally formed on the surface of the electrode in situ, the binding force of the electrolyte and the electrode is enhanced, and smooth ion transmission is guaranteed. When the composite material is applied to preparation of a supercapacitor, the performance and stability of the supercapacitor under a high-voltage working condition can be improved, the energy density and the power density are improved, the service life is prolonged, the requirement of the market for the high-performance supercapacitor is met, and technical development and application of the supercapacitor are promoted.

The application belongs to the technical field of hydrogen energy conversion by electrolysis of water, and particularly relates to a doped nickel oxide modified polysulfone composite diaphragm material and a preparation method thereof, which comprises uniformly dispersing polysulfone in N-methyl pyrrolidone to obtain a polysulfone solution, adding PVP or PEG to the polysulfone solution, stirring until complete dissolution to obtain a mixed solution, adding a doped nickel oxide material to the mixed solution, stirring until complete uniform dispersion to obtain a casting solution, degassing the casting solution by stirring, laying the casting solution on the front end of a doctor blade, sliding the doctor blade at a uniform speed to uniformly spread the casting solution on the surface of a glass film to obtain a liquid membrane, pre-evaporating the liquid membrane in air, immersing the pre-evaporated liquid membrane in deionized water to solidify into a film, peeling off the film and cleaning to obtain the doped nickel oxide modified polysulfone composite diaphragm material. By introducing the doped nickel oxide as a functional modification material, the hydrophilicity and conductivity of the diaphragm are effectively improved.

This application provides a lithium-rich manganese-based cathode material, its preparation method, and an electrochemical device. The lithium-rich manganese-based cathode material includes a substrate material and a coating layer. The coating layer includes a lithium hexafluorozirconate coating layer located on the surface of the substrate material and a fluoride coating layer located on the side of the lithium hexafluorozirconate coating layer away from the substrate material. The chemical formula of the substrate material is Li(Li₂)₃. x Mn a Ni 1‑a‑ b Al b )O 2‑δ Where 0.05≤x≤0.33, 0

The invention discloses a lithium ion halide solid electrolyte material as well as a preparation method and application thereof. The chemical general formula of a halide solid electrolyte is Li < x > MC < 4-y > F < x + y >, wherein 0 < x < = 2; x is greater than or equal to-x and less than or equal to y, and M is selected from one or two of transition metal elements Hf and Zr. The invention discloses a preparation method of a lithium ion halide solid electrolyte material. The halide solid electrolyte is used for preparing a solid electrolyte or a composite positive electrode of a lithium ion all-solid-state battery. By introducing F, on one hand, non-crystallization of the electrolyte is promoted, which is a reason for remarkably improving the conductivity of the electrolyte, and on the other hand, as the electronegativity of F is large, the high-voltage stability of the electrolyte is enhanced, so that the lithium ion halide solid electrolyte provided by the invention can be used for improving the conductivity of the electrolyte. And in a solid-state battery system, the material has relatively high ion conduction capability and good high-voltage stability and mechanical stability.

The invention belongs to the technical field of lithium ion battery positive electrode materials, and discloses a lithium manganese iron phosphate material with a solid-hollow composite structure and a preparation method thereof.The preparation method adopts a step-by-step reaction and co-sintering method, and comprises the steps that firstly, heterogeneous nucleation is achieved through the solubility product difference of manganese phosphate to form a hollow lithium manganese phosphate precursor; subsequently adding an iron source, a titanium source and other raw materials, and performing spray drying and inert atmosphere sintering to construct a composite structure of solid particles and hollow particles; the lithium manganese iron phosphate material with the solid-hollow composite structure has the characteristics that solid particles provide mechanical support, hollow microspheres increase ion conduction channels and a compact structure formed by a three-dimensional network, and the compaction density gt of a pole piece is realized; 2.5 g / cm < 3 > and 2C rate capacity retention rate gt; and the method has important new energy automobile and large-scale energy storage industrialization application value.

The application relates to the technical field of high-molecular functional materials, and discloses a polyaralkyl polymer and a preparation method thereof, a polyaralkyl polymer flat film and a preparation method thereof, an anion exchange film and a preparation method and application thereof. The polyaralkyl polymer has a structural unit shown in formula (I-1) or formula (I-2). The polyaralkyl polymer flat film provided by the application has the advantages of thin thickness, high mechanical strength, good stability and excellent ion conduction performance; and the anion exchange film provided by the application has excellent mechanical strength, electric conductivity and alkali stability. Formula (I-1); formula (I-2).

The application relates to the technical field of electrochemical energy storage, and discloses a low-negative-pressure sodium battery which comprises a negative electrode material, a positive electrode material, an electrolyte and a diaphragm, wherein the negative electrode material is hard carbon particles which are pre-lithiated and have a particle size of 5-10 mu m and are coated with a polyvinylidene fluoride-hexafluoropropylene functional layer; and a preparation method of the low-negative-pressure sodium battery is also disclosed, and the method comprises the following steps: S1, negative electrode material preparation: hard carbon particles and lithium metal sheets are mixed at a mass ratio of 1:0.4-0.6, and are heat-treated at 400-450 DEG C for 2-3 h. By adopting the pre-lithiated hard carbon negative electrode material, the stability of the battery under high-rate and long-cycle conditions is remarkably improved; by adopting the core-shell structure positive electrode material design, the structural stability and capacity retention rate of the battery in a high-temperature environment are enhanced; and by optimizing the electrolyte formula, the ion conductivity and decomposition resistance of the battery are improved.

This invention provides a method for preparing a magnesium-lithium separation composite membrane, comprising: fibrillating powder A and powder B to obtain mixture C; dry-forming mixture C to obtain a self-supporting dry-forming base membrane; adding PVDF and organic matter D to solvent E to obtain an impregnation solution; immersing the self-supporting dry-forming base membrane in the impregnation solution, and subjecting it to impregnation and drying to obtain the magnesium-lithium separation composite membrane. This invention utilizes a step-by-step synergistic process of fibrillation pretreatment – ​​dry-forming – impregnation composite, combined with multi-component coupling of inorganic powder A – organic framework – impregnated functional layer, to both fully preserve the fibrillated structure and enhance membrane toughness, while achieving a seamless and robust bond between the base membrane and the functional layer. The synergistic effect of PVDF and sulfonated ion-conductive polymers suppresses swelling while constructing a high conductivity pathway. The dry-forming base membrane physically confines and activates the intrinsic sieving ability of powder A, resulting in a membrane with high strength, low swelling, and high magnesium-lithium selectivity, exhibiting excellent overall performance.

The invention discloses a garnet type composite oxide solid-state electrolyte, a solid-state battery and a preparation method of the garnet type composite oxide solid-state electrolyte, the chemical general formula of the electrolyte is Li < 7 > La < 3-x > Zr < 2-y > M < z > O < 12 > awt% Al < 2 > O < 3 >, 0 < = x < = 3, 0 < = y < = 0.5, z = x + y, and 1.5 < = a < = 22. Through specific multi-element doping and component regulation, the ionic conductivity of the prepared solid electrolyte is improved to 1.95 * 10 <-2.74 > * 10 < S > / cm and is far higher than that of a traditional LLZO-based electrolyte on the premise that the pure LLZO crystal phase structure is kept stable and the ceramic density is kept at the excellent level of 85.4%-98.6%; and meanwhile, the ion transmission impedance of the electrolyte is reduced to 48.5-97.3 omega.cm, and the ionic conduction dynamic characteristic is remarkably improved. The technical problems that a traditional LLZO-based electrolyte is low in ionic conductivity and an impure phase is easy to generate are solved, and the prepared solid electrolyte has structural stability and excellent ionic conduction performance and has important application value in the field of solid lithium ion batteries.

The invention relates to a gel electrolyte material based on a zwitter-ion covalent organic framework and a preparation method of the gel electrolyte material. The invention discloses a preparation method of a gel electrolyte material based on a zwitter-ion covalent organic framework. The preparation method comprises the following steps: (1) preparing a nanoscale film substrate from a chain alkane polymer by adopting electrostatic spinning; (2) immersing the nanoscale film substrate into a reaction solution containing a COF precursor, and carrying out an in-situ polymerization reaction to obtain a composite film material; (3) dispersing the composite film material in acetonitrile, adding sultone monomers in the presence of argon at room temperature, and carrying out nucleophilic ring-opening reaction to obtain a functional film material; and (4) placing the functionalized film material in an organic electrolyte solution containing lithium salt, and obtaining the gel electrolyte material through physical swelling action. According to the zwitter-ion covalent organic framework-based gel electrolyte material and the preparation method thereof disclosed by the invention, the problems of low ion conduction efficiency, poor interface stability and the like of the existing electrolyte are solved.

The application relates to a negative electrode sheet, a battery and an electric device. The negative electrode sheet comprises a negative electrode current collector layer and a negative electrode material layer which are arranged in a stack, the negative electrode material layer comprises a carbon-based negative electrode material, a negative electrode binder and a first additive, the negative electrode binder comprises lithium polyacrylate, and the structural formula of the first additive is

The application provides a vacuum drying method of a sodium ion battery cell, and belongs to the technical field of sodium ion battery manufacturing; the technical problem to be solved is that existing sodium ion battery pole pieces are prone to water absorption, and electrolyte is prone to hydrolysis; the technical solution for solving the technical problem is that: step 1: pretreating the cell; step 2: placing the cell into an oven, starting a vacuum system and a heating system in the oven; step 3.1: preheating the oven; step 3.2: starting an inert gas supply system, introducing inert gas into the oven for pulse purging, and controlling the heating system to perform vacuum pulse baking, the purging period of pulse purging is consistent with the baking period of vacuum pulse baking; step 4: turning off the heating system, and taking out the cell after the temperature in the oven is naturally cooled; wherein, one baking period comprises a temperature rising stage, a constant temperature stage and a temperature falling stage; the application is applied to the production of sodium ion battery energy storage and power batteries.

The invention discloses a polymer film as well as a preparation method and application thereof. The polymer film has a spongy porous structure; the pore size of the polymer film is 0.05 to 150nm; the porosity of the polymer film is 1-200%; and the thickness of the polymer film is 10-500 [mu] m. According to the membrane prepared by the invention, the cyclohexane structure with good toughness and adjustable substituent groups is combined with the spongy pore structure obtained by the steam-induced phase separation method, so that the ionic conduction membrane with good mechanical property, good ion selectivity and good ionic conductivity is obtained. When the material is applied to a flow battery, good flow battery performance is obtained through multiple regulation and control of a cyclohexane structure, an organic solvent, a volatile solvent and a poor solvent steam atmosphere.

The invention discloses a positive electrode material as well as a preparation method and application thereof. The positive electrode material is obtained by carrying out anion doping on LiFeCl. The preparation method comprises the following steps: 1, weighing the raw materials LiCl, FeCl3 and the anionic dopant; and 2, carrying out ball milling on the weighed raw materials at 200 rpm for 2 hours by adopting a high-energy mechanical ball milling method, and then carrying out ball milling at 500 rpm for 10 hours to obtain uniform powder, namely a finished product of the positive electrode material. The positive electrode material is used for preparing a positive electrode for an all-solid-state battery. According to the invention, the intrinsic ionic conductivity of LiFeCl is improved through anion doping, so that the addition amount of the solid electrolyte in the positive electrode can be greatly reduced, thereby ensuring ion transmission, realizing higher active substance proportion and energy density, and reducing the cost and interface complexity.

This invention relates to an adhesive that can be used in lithium secondary batteries, particularly lithium-sulfur batteries, wherein the adhesive is manufactured via a reversible addition-fragmentation chain transfer (RAFT) polymerization reaction and has a structure comprising polymethyl methacrylate-derived blocks and polyacrylic acid-derived blocks centered on a thiocarbonyl sulfur functional group, and an aliphatic functional group at the outermost end. Therefore, it has the effect of improving the conductivity of the electrode using the adhesive and suppressing the dissolution of lithium polysulfides.

A solid electrolyte comprising a molecular crystal and an inorganic filler.

This invention belongs to the field of ion exchange membranes, and discloses an anion exchange membrane, its preparation method, and its application in flow batteries and hydrogen electrolyzers. The preparation method involves first copolymerizing tetraphenylethylene-vinyl monomers with styrene monomers via solution polymerization to obtain copolymer A; then, copolymer A undergoes a chloromethylation reaction to obtain copolymer B; finally, copolymer B reacts with trimethylamine to obtain polymer C. This polymer C can be used to fabricate anion exchange membrane using common polar, high-boiling-point solvents such as N,N-dimethylformamide via solution casting. This anion exchange membrane can be applied to flow batteries, improving coulombic efficiency and energy efficiency in vanadium redox flow battery systems and ensuring cycle stability; it is particularly suitable for use in AEM hydrogen electrolyzers, exhibiting excellent durability, high ionic conductivity, and mechanical properties.

This invention relates to the field of battery technology, specifically to a battery. The battery includes a positive electrode, a negative electrode, and a separator. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer includes a three-dimensional network framework and positive active material located within the three-dimensional network framework. The three-dimensional network framework is formed by a conductive binder, which includes carbon nanotubes and an adhesive layer. Along the thickness direction of the positive active material layer, the positive active material layer includes a first surface away from the positive current collector, and the conductive binder is distributed on the surface of the first surface. The separator includes a carrier layer and a coating layer. The coating layer adjacent to the first surface of the positive electrode is a first coating layer. The proportion W of the projected area of ​​the first coating layer on the surface of the carrier layer in the surface area of ​​the carrier layer is 5%-65%. The battery of this invention has high interfacial adhesion between the separator and the positive electrode, which can maintain good adhesion during cycling, improving the cycle performance of the battery.

The application discloses a lithium ion negative electrode sheet and a preparation method thereof. A surface of the negative electrode sheet is formed with an artificial solid-state electrolyte film. The artificial solid-state electrolyte film is converted from PTFE through an in-situ electrochemical reduction reaction. The artificial solid-state electrolyte film is a composite structure of amorphous carbon and LiF. Through the in-situ electrochemical reaction of PTFE and solid lithium amalgam, a composite solid-state electrolyte film of amorphous carbon and LiF is generated on the surface of the negative electrode, and the synergistic improvement of high ionic conductivity, high mechanical strength, good flexibility and excellent cycle stability is realized.

The present invention relates to a cathode for an all-solid-state battery, and an all-solid-state battery including the same, the cathode including: a current collector; and a cathode active material layer disposed on the current collector, wherein the cathode active material layer includes a cathode active material, a binder, and a solid electrolyte represented by Formula 1: and the cathode active material has an effect of reducing the porosity of the cathode and improving ion conductivity and electrical conductivity.[Formula 1] Li a P b S c Cl d X e In Formula 1, 4 ≤ a ≤ 7, 0 ≤ b ≤ 1, 3 ≤ c ≤ 5, 0 ≤ d < 0.3, and d

The invention discloses a nanoparticle-doped polybenzimidazole ion solvated membrane and a preparation method and application thereof.The preparation method of the ion solvated membrane comprises the steps that under nitrogen protection, a 3, 3-diaminobenzidine monomer and a terephthalic acid monomer are subjected to a condensation polymerization reaction in polyphosphoric acid, and a viscous solution containing a benzimidazole polymer is obtained; dispersing inorganic nanoparticles in a phosphoric acid solution, then adding into the obtained polymer solution, continuously stirring, and then carrying out vacuum degassing, so as to obtain a membrane casting solution; and pouring the obtained membrane casting solution on a glass plate, carrying out blade coating by using a coater, carrying out hydrolysis at room temperature, taking down the membrane from the glass plate, soaking the membrane in a carbonate solution to wash away residual phosphoric acid, and soaking the membrane in an alkaline solution for storage to obtain the doped polybenzimidazole ion solvated membrane. The obtained composite membrane shows more excellent ionic conductivity, structural stability and electrolysis performance in alkaline electrolyzed water, and an ionic solvation membrane material with more excellent performance is provided for hydrogen production by alkaline electrolyzed water.