202results about How to "High ion conductivity" patented technology

The invention belongs to but not limited to the technical field of electrode materials, and particularly relates to a high-tap-density lithium nickel manganese oxide positive electrode material, a preparation method and a lithium ion battery, the chemical general formula of the high-tap-density lithium nickel manganese oxide positive electrode material is LiNi < 0.5-x > Mn < 1.5-y > M < x > N < y > O < 4 >, 0.1, 0 < = y < lt >; 0.1, M and N are doping elements and comprise one or more of Mg, Co, Al, Zr, W, Sb, Ta and Ti; the material is micron-sized spherical secondary particles formed by stacking and aggregating nano-sized octahedral primary particles, and is uniformly dispersed without agglomeration; the spherical secondary particles are formed by mixing spherical secondary particles with large and small particle size distribution, and the average particle size range of the large particles is 3lt; d < 50lt >; the average particle size range of the small particles is 1lt; d < 50lt >; 2 [mu] m.

This solid electrolyte (10) contains LiaAbEc (SO4) dJeXfHh... (1), in formula (1), A is at least one element selected from the group consisting of alkali metals other than Li and alkaline earth metals, E is at least one element selected from the group consisting of Al, Ga, In, Sc, Y, Ti, Zr, Hf and lanthanide elements, and J is selected from the group consisting of OH, BO2, BO3, BO4, B3O6, B4O7, CO3, NO3, AlO2, SiO3, SiO4, Si2O7, Si3O9, Si4O11, Si6O18, PO3, PO4, P2O7, P3O10, SO3, SO5, S2O3, S2O4, S2O5, S2O6, S2O7, S2O8, BF4, 0.5 < = a < 6, 0 < = b < 6, 0 < c < 2, 0.1 < d < = 6.0, 0 < e < = 6.0, 0 < f < = 6.1, and 0 < = h < = 0.2 are satisfied, and a peak is confirmed at a diffraction angle 2 [theta] = 22.3 DEG + / -1.0 DEG in an X-ray diffraction pattern using Cu-K [alpha] as a radiation source.

The invention discloses a natural polysaccharide assisted MXene porous membrane electrode and a preparation method thereof, and relates to the technical field of electrodes. According to the technical scheme, hydrochloric acid and lithium fluoride are used for carrying out etching and intercalation on an MAX raw material, and MXene dispersion liquid is obtained; mixing the MXene dispersion liquid with a metal ion solution to obtain a metal ion doped MXene solution; mixing the metal ion doped MXene solution with a natural polysaccharide dispersion liquid to obtain a natural polysaccharide modified MXene dispersion liquid; mixing the natural polysaccharide modified MXene dispersion liquid with a template substance, performing vacuum filtration, and performing vacuum drying to obtain a flexible MXene film; and carrying out template substance removal treatment on the flexible MXene film to obtain the natural polysaccharide-assisted MXene porous film electrode. According to the invention, the stacking problem of the MXene material is solved, and the electrochemical performance of the natural polysaccharide-assisted MXene porous membrane electrode is obviously improved.

The invention discloses a battery using an adhesive for improving the first effect and circulation of a silicon negative electrode system cell, the adhesive is formed by polymerizing acrylic acid, quasi-acrylic acid and hydroxyethyl acrylate monomer, the hydroxyethyl acrylate monomer accounts for 1.5-3% of the total mass of the monomer, the acrylic acid monomer accounts for 16-58% of the total mass of the monomer, and the acrylic acid monomer accounts for 0.5-1.5% of the total mass of the monomer. The content of the acrylic monomer is 40-82%, the hydroxyethyl acrylate monomer is located in the middle of the polymer, the structural formula of the acrylic monomer is as follows: # imgabs 0 # R1 and R2 are independently selected from any one of H, carboxyl, hydroxyl, methoxyl and phenyl, R3 is selected from any one of cyano and # imgabs 1 #, R4 is selected from one or more of C1-C6 alkoxy, hydroxyl, amino, ester group, acylamino, chloroformyl and acyloxy, and n is 1-3. And R5 is selected from any one of H, carboxyl, hydroxyl, methoxyl and phenyl. The adhesive provided by the invention is strong in adhesive capacity, good in adaptability to volume expansion of a silicon negative electrode, and capable of effectively improving the cycle and the first effect of the battery, and is applied to the battery.

The invention discloses a large-particle emulsion type binder and a preparation method thereof, a battery diaphragm and a lithium ion battery, the large-particle emulsion type binder comprises particles, D10 of the particles is greater than or equal to 1.2 [mu] m, D50 is 1.5-2.5 [mu] m, D90 is less than or equal to 4 [mu] m, D99 is less than or equal to 6 [mu] m, and the particles comprise microsphere seeds, a core layer coating the outer surface of the microsphere seeds and a shell layer coating the outer surface of the core layer. According to the large-particle emulsion type binder provided by the invention, the stability of the binder is improved through a three-layer coating structure, and the viscosity of the large-particle emulsion type binder is favorably changed through the outermost shell layer structure, so that the emulsion type binder with proper viscosity is obtained; the reactive emulsifier containing a sulfonic acid group is adopted, and the sulfonic acid group has good compatibility with Ca < 2 + >, Mg < 2 + > or other heavy metal ions, so that the ionic conductivity of the binder can be enhanced, the interface stability of the electrode material can be improved, the overall performance of the battery can be improved, and the cycle life of the battery can be prolonged.

The invention provides a halide solid-state electrolyte and a preparation method and application thereof. The halide solid-state electrolyte comprises a halide solid-state electrolyte inner core and a halide solid-state electrolyte outer core, and the hydrophobic layer is uniformly coated on the halide solid electrolyte core, and the hydrophobic layer comprises bis-hexadecyl phosphate. According to the halide solid electrolyte as well as the preparation method and the application thereof, the air stability of the halide solid electrolyte can be remarkably improved, the cycle performance of an all-solid-state lithium ion battery is improved, the manufacturing process is simple, and the cost is relatively low.

The invention discloses a silicon active material for an ultrahigh-capacity secondary battery, which is characterized in that nano-sized silicon dioxide particles are used as a matrix, the surfaces of the silicon dioxide particles are directionally coated with a mixed solution, and silicon nano-particles with a three-dimensional structure are formed after high-temperature reduction reaction in a hydrogen environment. And coating the obtained nanoparticles with a surface conductive layer to obtain the silicon active material with a mechanical and electrochemical stable three-dimensional structure. The invention also provides a preparation method and application of the silicon active material for the ultrahigh-capacity secondary battery. The silicon active material has the characteristics of ultrahigh specific capacity, stable cycle performance, low cost and the like, the raw materials are high in selection flexibility, the price is low, and the preparation process is simple.

The present invention relates to a composite electrolyte exhibiting improved mechanical properties and ion conductivity while preventing liquid leakage, a method for preparing the same, and a lithium secondary battery comprising the same. The composite electrolyte may include: a liquid electrolyte; a cross-linked polymer of monomers having curable functional groups; and oxide-based solid electrolyte particles dispersed on the cross-linked polymer and having a particle diameter of greater than 300 nm.

The invention relates to a composite lithium supplementing material, a preparation method thereof and a secondary battery. The composite lithium supplementing material comprises secondary particles, the secondary particles comprise a plurality of primary particles and a functional additive, at least part of the functional additive is distributed among the primary particles, the primary particles are lithium-rich particles, and the functional additive comprises one or more of a conductive agent, a dispersing agent and a catalyst. The composite lithium supplementing material has relatively good conductivity, ion conductivity and dispersing performance or relatively low lithium removal decomposition voltage, so that the composite lithium supplementing material has relatively good coating performance and processing performance.

The invention relates to the technical field of batteries, in particular to a composite solid electrolyte, a preparation method thereof and a solid-state battery. The provided composite solid electrolyte comprises: an electrolyte matrix comprising at least one of a sulfide electrolyte, a halide electrolyte or an oxide electrolyte; the coating layer is coated on at least part of the surface of the electrolyte matrix, and the coating layer comprises a sulfone polymer and lithium salt and / or ionic liquid. The preparation method of the composite solid electrolyte comprises the following steps: providing a coating material solution which comprises a sulfone monomer and a lithium salt and / or an ionic liquid; and mixing the coating material solution with an electrolyte matrix, an initiator and a solvent, heating, stirring and drying to form a coating layer on at least the surface of the electrolyte matrix, thereby obtaining the composite solid electrolyte. The oxidation resistance of the electrolyte can be improved, the ion conduction effect of the electrolyte can be improved, and the cycle stability of the battery can be guaranteed.

The invention discloses an electrolyte for a soft package cylindrical battery. The electrolyte comprises the following components in parts by weight: 10-25 parts of lithium salt, 60-85 parts of an organic solvent and 5-15 parts of a functional additive, the lithium salt is prepared from 10 to 18 parts of lithium hexafluorophosphate, 2 to 5 parts of lithium bis (fluorosulfonyl) imide and 0.1 to 1 part of lithium difluorophosphate; the organic solvent is prepared from 10 to 20 parts of ethylene carbonate, 30 to 45 parts of propyl propionate, 10 to 20 parts of ethylene carbonate and 5 to 10 parts of propylene carbonate; the functional additive is prepared from 0.5 to 2 parts of vinylene carbonate, 1 to 3 parts of propylene sulfite, 3 to 8 parts of ethylene sulfate, 0.5 to 1.5 parts of fluoroethylene carbonate, 0.1 to 0.5 part of lithium bis (oxalato) borate and 0.1 to 0.5 part of lithium bis (oxalato) borate. The electrolyte disclosed by the invention is applied to the soft package cylindrical battery, the permeability and infiltration efficiency of the electrolyte can be remarkably improved, and the electrochemical performance of the battery is improved.

The invention provides an all-solid-state battery and application thereof. The all-solid-state battery comprises a positive pole piece and a negative pole piece, a protective layer is arranged on the surface of the lithium metal negative electrode; and the solid-state electrolyte membrane is arranged between the positive pole piece and the lithium metal negative pole, and the solid-state electrolyte membrane comprises sulfide solid-state electrolyte. According to the all-solid-state battery and the application thereof provided by the invention, the interface stability between the lithium metal negative electrode and the solid electrolyte can be enhanced, side reactions can be reduced, and the all-solid-state battery with long cycle performance can be obtained by combining the all-solid-state battery with the sulfide solid electrolyte provided by the invention.

The invention discloses a high-entropy porous ferric sodium phosphate pyrophosphate positive electrode material and a preparation method thereof, and belongs to the technical field of sodium ion battery positive electrode materials, the positive electrode material takes ferric sodium phosphate pyrophosphate-transition metal as a base material, and the surface is coated with a carbon layer; the specific surface area of the high-entropy porous ferric sodium pyrophosphate positive electrode material is 20-30m < 2 > / g; the chemical formula of the ferric sodium pyrophosphate-transition metal is Na < 4 > Fe < 3-x > M < x > (PO4) < 2 > P < 2 > O < 7 >, the transition metal M comprises at least five of Ti, Cr, Mn, Co, Ni, Cu, Zn, Y, Zr, Ag and Mo. The high-entropy porous ferric sodium phosphate pyrophosphate positive electrode material is prepared by adopting high-entropy porous construction and interface carbon coating synergistic treatment for the first time, so that the structural stability and the specific surface area of the ferric sodium phosphate pyrophosphate are greatly improved; compared with other ferric sodium phosphate pyrophosphate, the high-entropy porous ferric sodium phosphate pyrophosphate is higher in electron transmission speed, shorter in ion diffusion distance, richer in electroactive reaction sites, high in gram volume, stable in electrochemical performance and excellent in rate capability.

The invention relates to the technical field of electrolyte preparation, and discloses a lithium ion battery electrolyte capable of ensuring low-temperature discharge characteristic, which comprises the following components in percentage by mass: 25% of propylene carbonate (PC), 35% of dimethyl carbonate (DMC), 20% of gamma-butyrolactone (GBL), 20% of ethyl acetate, 1.0 mol / L of lithium salt bis (trifluoromethanesulfonimide) (LiTFSI), 3% of additive 1, 3-propane sultone (PS) (mass fraction: 0.1% of sodium hydroxide (mass fraction: 0.1% of sodium hydroxide), and the balance of water. According to the present invention, the low temperature performance of the solution is improved, the unique solvent formula and the unique solvent ratio enable the electrolyte to have good fluidity in the low temperature environment, and the freezing point of the electrolyte is effectively reduced so as to ensure that the lithium ions can smoothly migrate between the electrodes at the low temperature, such that the lithium ion battery performance is improved, and the lithium ion battery performance is improved. The discharge performance of the battery under a low-temperature condition is obviously improved, and the application scene of the lithium ion battery is expanded.

The invention relates to the technical field of electrochemistry, and discloses a novel ionic crosslinking type high-conductivity amphoteric membrane which comprises the following components in percentage by mass: 50% of side chain ionic crosslinking type fluorine-containing branched sulfonated polyimide, 25% of polybenzimidazole, 0.5%-1% of polydopamine functionalized carbon nanotubes, 5% of polyether amide and 5% of a siloxane durability improver. The polydopamine functionalized carbon nanotube can be replaced by a graphene oxide, the polydopamine functionalized carbon nanotube and the graphene oxide are both nanoscale fillers, and the ionic liquid is one of ethyl-3-methylimidazole sulfonate and a polymer electrolyte-based ionic liquid. By optimizing the proportion design of the ionic cross-linked membrane, the conductivity and chemical resistance can be improved by adding a conductive reinforcing agent such as polydopamine functionalized carbon nanotubes and a hydrophilic agent such as polyether amide, meanwhile, the high-temperature stability and ionic conduction performance are optimized, and the electrochemical application requirements are met.

The invention provides a diaphragm with an active coating for a battery and a preparation method of the diaphragm. The diaphragm is composed of a diaphragm substrate and a composite coating coated on the substrate, the composite coating comprises an outer coating and an inner coating, wherein the outer coating contains N-methyl-N-propyl pyrrolidine bis (trifluoromethanesulfonyl) imide, and the inner coating contains any one or more of polyacrylic acid, a metal organic framework compound, modified boehmite, polyvinylidene fluoride and polymethyl methacrylate. The N-methyl-N-propyl pyrrolidine bis (trifluoromethanesulfonyl) imide salt is coated on the diaphragm, so that the thermal stability and the ionic conductivity of the diaphragm can be enhanced, the internal resistance of the battery is reduced, the charge-discharge efficiency of the battery is improved, the cycle life of the battery is prolonged, and meanwhile, the potential harm to the environment is relatively small. The N-methyl-N-propyl pyrrolidine bis (trifluoromethanesulfonyl) imide salt has good compatibility with the electrolyte of the lithium ion battery and is not easy to generate chemical reaction, so that the performance stability and the safety of the battery are ensured.

The invention belongs to the technical field of solid-state electrolyte, and provides high-voltage-resistant composite solid-state electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a polymer, an inorganic filler, a lithium salt and a solvent to obtain a precursor solution, mixing the precursor solution, a cross-linking agent and an initiator to obtain a reaction solution, and curing the reaction solution; the species of polymers are defined. The chemical environment of the electrolyte is improved and the crystallinity of the polymer is regulated and controlled through the cross-linked structure of the polymer, so that the electrochemical window and the ionic conductivity of the composite solid electrolyte are improved, and the composite solid electrolyte can work between 1.5 V and 5.4 V and is matched with a high-voltage positive electrode and lithium metal for use; excellent cycling stability can be shown at room temperature and even in an extremely low-temperature environment; the amphoteric polyionic liquid monomer is used as a polymer matrix, so that enough mechanical strength is ensured, an efficient and stable Li < + > channel can be formed, and the ionic conductivity is relatively high at room temperature.

The invention discloses a colorful stretchable electrochromic device based on gold nanowires and a preparation method thereof.The preparation method adopts a wet process to prepare vertically-arranged gold nanowire electrodes, the gold nanowire electrodes are embedded into a flexible stretchable substrate, the device keeps high conductivity and good optical transparency, and meanwhile, the device has the advantages of being high in electrochromic efficiency, good in electrical conductivity and good in optical transparency. Excellent mechanical performance and structural stability are realized; the solid electrolyte is used to avoid the problems of volatilization and leakage of the liquid electrolyte, so that the reliability and the service life of the device are remarkably improved; according to the electrochromic device, different organic electrochromic materials can be deposited through electro-polymerization to achieve colorful changes in a wide spectral range, the spectral range covers a region from visible light to near-infrared light, and the electrochromic device is widely applied to the fields of flexible display devices, optics and the like due to the patterned design and the colorful display function of the electrochromic device; in addition, by optimizing the embedding mode of the gold nanowire and the substrate, the device can maintain stable electrical and optical performance under the conditions of multiple times of stretching and complex mechanical deformation.

The invention discloses an electrolyte, a battery and electric equipment, the electrolyte comprises a first additive, a lithium salt and a solvent, and the first additive comprises at least one of thioimidazolidinone compounds containing carbon-carbon double bonds. The electrolyte comprises the first additive, and the first additive has multifunctional effects of positive and negative electrode film forming and transition metal ion complexing, so that an interfacial film formed by a positive electrode and a negative electrode has excellent ion conductivity and film forming stability, and DCR increase in the charging and discharging process can be effectively inhibited; meanwhile, dissolution and deposition of transition metal ions in the positive electrode material at high temperature / high pressure can be effectively inhibited, so that the high-temperature cycle performance and the storage performance of the battery are improved.

The present invention discloses a porous composite foil, including a porous composite foil current collector; the porous composite foil current collector includes a polymer insulating layer and two metal conductive layers; the upper and lower sides of the polymer insulating layer are respectively covered with a layer of the metal conductive layer; a plurality of through holes are penetrated through the porous composite foil current collector; the outer side surface of each metal conductive layer in the porous composite foil current collector is respectively coated with a layer of mixed primer. The present invention also provides a positive electrode plate, a negative electrode plate and a semi-solid lithium ion battery and a preparation method. In view of the problem of large internal resistance of the original composite foil, the present invention introduces a mixed primer containing a conductive agent and an inorganic oxide solid electrolyte with good electronic conduction and ion conduction on the surface of the porous composite foil, thereby improving the bonding adhesion between the active material and the current collector, constructing a complete ion and electron transmission channel, reducing the internal resistance of the battery, and improving the rate performance.

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 invention discloses a method for simply and rapidly etching graphene oxide and application thereof. Sulfuric acid etching is adopted, more oxygen-containing groups are exposed through secondary oxidation of sulfuric acid, and more ion transmission channels are provided by penetrating and pore-forming on the surface of the two-dimensional sheet layer. Sulfonated polyetheretherketone which is relatively low in cost and simple in synthesis process is selected as a polymer substrate, etched graphene oxide is used as a filler and doped with the polymer substrate to prepare the flow battery diaphragm, on one hand, the etched graphene oxide contains more exposed oxygen-containing groups, so that formation of hydrogen bonds with sulfonic acid groups in the polymer substrate is facilitated, and ion transmission is promoted; on the other hand, the two-dimensional lamella of the graphene oxide has a hindering effect on ion transmission, the size of the graphene oxide can be broken through etching, holes are formed in the surface in a penetrating mode, more transmission channels are provided by surface hole channels, the high ion selectivity characteristic of the graphene oxide is reserved, and meanwhile the ion conduction capacity of the graphene oxide is improved; therefore, the dual-performance improvement of the hybrid membrane is realized.

The invention discloses an oxygen-rich thiomolybdate compound, a preparation method and application of the oxygen-rich thiomolybdate compound in ion conduction, and belongs to the field of synthesis of multi-metal oxygen clusters. The oxygen-rich thiomolybdate compound is synthesized by adopting a one-pot method, and ionic conductivity tests are carried out on the synthesized oxygen-rich thiomolybdate compound at different temperatures and humidity, so that the oxygen-rich thiomolybdate compound is found to have relatively high ionic conductivity in a wide temperature range; moreover, typical temperature and humidity dependent ionic conductivity is presented, and the conductivity is increased along with the increase of the temperature and increased along with the increase of the humidity. The ionic conductivity can reach 8.6 * 10 <-3 > S cm <-1 > under the conditions that the humidity is 80% and the temperature is 85 DEG C, so that the compound has a good prospect of serving as an efficient ionic conductor. The preparation method disclosed by the invention is simple in process, the product is easy to crystallize, the reaction time is short, the synthesis yield is high, and the prepared oxygen-rich thiomolybdate compound has good ionic conductivity and can be widely applied to ionic conduction materials.

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 present invention provides a negative electrode active layer, a double negative electrode active layer, a negative electrode plate and a lithium ion battery. The negative electrode active layer includes a carbon-modified lithium metasilicate binder, and the content of the carbon-modified lithium metasilicate binder is 2.4% to 3.2% based on the total weight of the negative electrode active layer as 100%. The negative electrode active layer of a lithium ion battery provided by the present invention, which includes carbon-modified lithium metasilicate, can be used as a binder to construct a cross-linked network in the negative electrode active layer, improve the internal resistance, adhesion, liquid absorption capacity, expansion and ion conductivity of the negative electrode plate, and finally obtain a lithium ion battery that can simultaneously take into account high rate performance, low internal resistance and long cycle.

The invention discloses a preparation method and application of a lithium iron phosphate composite material, and relates to the technical field of preparation of lithium iron phosphate composites.The preparation method comprises the following steps that 1, lithium iron phosphate, carbon nanotubes and bacterial cellulose are mixed according to the mass ratio of (7-9): (0.5-1.5): (0.5-1.5), and then the mixture is placed in a mold; (2) horizontally placing the mold containing the sample in a freezing refrigerator, and freezing at-60 DEG C to-50 DEG C for 12-24 hours to ensure that the mold is completely frozen and crystallized; and (3) taking out the sample which is completely frozen and crystallized, putting the sample into a vacuum freeze dryer, and carrying out drying treatment for 24-48 hours at the temperature of 60 DEG C below zero to 50 DEG C below zero to obtain the novel lithium iron phosphate composite material. The lithium iron phosphate composite material prepared by the invention has excellent ionic conductivity, can be applied to lithium extraction of salt lake brine, and has excellent lithium extraction performance.

The invention relates to the field of electrolytes, in particular to an electrolyte with double protection functions of thermal runaway and battery damage and a technology for applying the electrolyte to a lithium metal battery. The electrolyte takes lithium hexafluorophosphate as an electrolyte lithium salt and ethylene carbonate and diethyl carbonate as organic solvents; an organic compound containing a plurality of hydroxyl groups, ether bonds and quaternary ammonium salt structures is added as an electrolyte additive. The molecule can effectively inhibit the thermal runaway phenomenon of the lithium battery under a high-temperature condition by absorbing heat generated by the battery and regulating and controlling internal chemical reaction; a stable solid electrolyte interface film can be formed on the surface of the negative electrode of the battery, so that interface impedance and charge transfer resistance are reduced, the cycle life of the battery is prolonged, and the coulombic efficiency of the battery is improved; and oxygen can be effectively prevented from entering the battery, so that the battery is protected from being damaged to a certain extent. Therefore, the electrolyte prepared by the invention can be applied to assembly of a metal lithium battery, and has a wide application prospect compared with the prior art.

The invention relates to Li-beta ''aluminum oxide solid electrolyte ceramic and a preparation method thereof. The method comprises the following steps: obtaining Na-beta'' aluminum oxide ceramic precursor powder; carrying out molding treatment on the Na-beta ''aluminum oxide ceramic precursor powder to obtain a Na-beta'' aluminum oxide ceramic green body; and carrying out buried sintering on the Na-beta ''aluminum oxide ceramic green body to obtain the Na-beta'' aluminum oxide solid electrolyte ceramic, and embedding the Na-beta ''alumina solid electrolyte ceramic into a mixture of a lithium oxide and a first aluminum oxide, and carrying out an ion exchange reaction at a set temperature to obtain the Li-beta'' alumina solid electrolyte ceramic. The preparation method of the Li-beta ''aluminum oxide solid electrolyte ceramic provided by the embodiment of the invention not only can improve the sintered body density of the solid electrolyte ceramic, but also can maintain good stability and excellent ionic conductivity, namely, improve the comprehensive performance of the Li-beta'' aluminum oxide solid electrolyte ceramic.

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 solid electrolyte membrane material, a preparation method, a membrane and a device, the main raw material of the membrane material has the following structure: # imgabs0 #, m and n are positive integers; ar2 is an aromatic compound group; r7 is a side chain group with charges; r8 is # imgabs 1 #, R1 is alkyl or aryl or halogen-substituted alkyl or halogen-substituted aryl, R2-R6 are independently selected from hydrogen, alkyl, aryl, halogen, halogen-substituted alkyl and halogen-substituted aryl, and at least one of R2-R6 is fluorine; and the molar ratio of R8 to Ar2 in the main raw materials is 0.01-50%. According to the solid electrolyte membrane material, the preparation method, the membrane and the device, the membrane material is simple to prepare and has high ionic conductivity, low swelling property and high ionic conductivity.