220 results about "Lithium titanate" patented technology

The invention relates to a desolventizing layer modified silicon-carbon negative electrode and a preparation method, the desolventizing layer modified silicon-carbon negative electrode comprises a silicon-carbon negative electrode, the silicon-carbon negative electrode comprises porous carbon mainly comprising mesopores and a silicon substrate attached in the pores of the porous carbon, and the desolventizing layer is covered on the surface of the silicon-carbon negative electrode. The desolventizing layer is an oxide of an amorphous active metal and a composite oxide of the amorphous active metal and lithium, the desolventizing layer at least covers the surface of the silicon substrate in the pores of the porous carbon, the desolventizing layer is made of amorphous titanium oxide, lithium titanate, niobium oxide, lithium niobate and titanium niobate, and after the electrolyte permeates into the pores of the porous carbon, the surface of the silicon substrate is coated with the desolventizing layer. And the lithium ions subjected to desolvation through the desolvation layer are alloyed with a silicon substrate. And the structural stability, the charge-discharge efficiency and the rate capability of the silicon-carbon negative electrode material are improved.

The invention belongs to the technical field of lithium batteries, and particularly relates to a composite metal lithium material, a preparation method and application thereof and a composite metal lithium negative electrode. The composite metal lithium material comprises metal lithium, and lithium titanate and a carbon material which are dispersed in the metal lithium. The composite metal lithium negative electrode is prepared from the composite metal lithium material through hot pressing, lithium titanate and a carbon material serve as a lithium-loving supporting structure, the interface stability and the structural stability of the composite metal lithium negative electrode in the circulation process can be synergistically improved, and the advantage of high capacity of lithium metal is kept; and the problems of infinite volume change of the lithium metal negative electrode and uncontrollable growth of lithium dendrites are solved, so that the composite metal lithium negative electrode has excellent cycling stability. The preparation method of the composite metal lithium negative electrode has the advantages of being easy to operate and good in repeatability.

The invention provides a positive plate, a battery, a battery pack and electric equipment. The positive plate comprises a positive current collector, a first positive active layer and a second positive active layer, wherein the first positive active layer and the second positive active layer are stacked on at least one side of the positive current collector; the first positive electrode active layer comprises a first positive electrode active material, and the second positive electrode active material comprises a first positive electrode active material and a second positive electrode active material; the first positive electrode active material comprises at least one of a manganese-based positive electrode active material, an iron-based positive electrode active material and a manganese-iron mixed-based positive electrode active material, and the second positive electrode active material comprises at least one of a ternary positive electrode active material, lithium cobalt oxide, lithium nickelate and lithium titanate; the second positive electrode active layer further comprises a second conductive agent, and the second conductive agent comprises at least two linear conductive agents and at least one of a sheet-shaped conductive agent and a point-shaped conductive agent. The positive plate has a special structure and composition, and can effectively improve the impedance increase of the battery and improve the cycle performance of the battery.

The present invention belongs to the field of ion battery technology, specifically relating to silicon-based composite materials, their preparation methods and applications, lithium-ion batteries, and their negative electrode materials and negative electrode sheets. In the present invention, nano-silicon material and lithium titanate are ball-milled to obtain a ball-milled product; the mass of the lithium titanate accounts for 1-10% of the mass of the nano-silicon material, and the ball-milling speed is ≤500 rpm. ‑1 , for ≤10 h; and sintering the ball-milled product in a protective gas atmosphere to obtain the silicon-based composite material, wherein the sintering temperature is ≤500°C. The silicon-based composite material provided by the present invention is applied to lithium-ion batteries and exhibits significant initial discharge specific capacity, good rate performance, and excellent first coulombic efficiency. Furthermore, the preparation method is simple and environmentally friendly, making it suitable for large-scale industrial applications.

The present disclosure relates to a negative electrode and a secondary battery including the same, wherein safety against external short circuit is improved by increasing resistance in the battery.In an aspect of the present disclosure, the electrode includes:a current collector; anda plurality of negative electrode active material layers provided on at least one side of the current collector, whereinthe plurality of negative electrode active material layers includea first negative electrode active material layer including lithium titanium oxide (LTO) and carbon nanotube (CNT) andone or more second negative electrode active material layer including a negative electrode active material other than the lithium titanium oxide (LTO),the loading amount of the first negative electrode active material layer is 0.2 mAh / cm2 or less, andthe first negative electrode active material layer is in contact with the current collector or is located between the two or more second negative electrode active material layers.

The invention relates to the field of lithium ion batteries, and discloses a lithium titanate composite material and a preparation method thereof, a negative pole piece and a preparation method thereof, a lithium battery and a battery pack. The surfaces of lithium titanate particles are sequentially coated with the nitrogen-doped carbon intermediate layer and the two-dimensional MXene material outer layer, and the MXene material outer layer is formed by bridging adjacent particles through hydrogen bonds, so that a'core-shell-bridge 'three-dimensional conductive network structure is constructed, the electronic conductivity of the lithium titanate composite material is remarkably improved, the electron / ion transmission efficiency of the lithium titanate negative electrode is improved, and the lithium titanate negative electrode has a good application prospect. The lithium ion battery has excellent rate capability and cycle performance; and through collaborative optimization of the three-dimensional composite material and the electrolyte, the interface impedance is reduced, and polarization is inhibited, so that the lithium battery still keeps high capacity and long cycle stability under ultrahigh rate, and meanwhile, the problems of discontinuous conductive network and high interface impedance in the prior art are solved. And excellent rate capability and cycle performance can be achieved under ultrahigh rate.

The invention provides a positive electrode material and a preparation method thereof, a positive electrode plate and a secondary battery, and belongs to the field of battery materials, the positive electrode material comprises an inner core and a composite coating layer coating the surface of the inner core; the inner core comprises lithium iron phosphate, and the composite coating layer comprises a carbon material and a metal oxide; wherein the metal oxide comprises at least one of lithium titanate, lithium manganate and lithium cobalt oxide. The carbon material and the metal oxide containing titanium, cobalt and manganese are compounded to serve as the composite coating layer to coat the lithium iron phosphate core, on one hand, the microstructure characteristics of the metal oxide containing titanium, cobalt and manganese are utilized, richer channels are provided for lithium ion diffusion, on the other hand, the high electron conductivity of the carbon material is utilized, and the lithium ion diffusion efficiency is improved. The prepared positive electrode material can simultaneously have relatively high electronic conductivity and lithium ion diffusion rate, and when the positive electrode material is used as a lithium ion battery, the charge-discharge performance and the cycle life of the lithium ion battery are remarkably improved.

The invention discloses a solid electrolyte membrane of a bimetal MOFs composite lithium ion sieve and a preparation method and application of the solid electrolyte membrane. The preparation method of the electrolyte membrane comprises the following steps: dispersing a bimetallic MOFs material, a phenylphosphinic acid modified lithium titanate molecular sieve and a lithium salt in a solvent, adding a polymer material, and mixing and stirring to obtain mixed slurry; and pouring the mixed slurry into a container paved with a polytetrafluoroethylene film, and volatilizing the solvent to obtain the coating. The composite solid-state electrolyte membrane has good ionic conductivity, good toughness and good mechanical properties, and can improve the cycle performance and rate capability of a battery when applied to the solid-state battery. The preparation method is simple, low in cost and suitable for large-scale industrial production.

The invention is suitable for the technical field of lithium ion battery materials, and discloses a graphene-heteroatom doped porous carbon material, a lithium titanate amorphous carbon coated silicon carbon composite material, a preparation method thereof, a negative pole piece and a lithium ion battery. The graphene-heteroatom doped porous carbon material is prepared from porous carbon, graphene and heteroatoms, the graphene and the heteroatoms are distributed in the porous carbon, and in percentage by mass, the content of the graphene is 0.5 wt%-2wt%, the content of the heteroatoms is 0.5 wt%-2wt%, and the balance is the porous carbon. According to the graphene-heteroatom doped porous carbon material disclosed by the invention, the compaction density of porous carbon is improved by utilizing high electron conductivity of heteroatoms and high ductility of a graphene lamellar structure; in addition, a basic group on the surface of the heteroatom solution and an acidic group of the graphene oxide can generate a chemical bond linked carbon structure through a hydrothermal reaction, and the tap density and the electronic conductivity of the material are improved.

The invention discloses a high-energy-density fast-charging polymer soft package battery, which comprises a positive electrode, a negative electrode, a diaphragm, an electrolyte and a packaging body, the positive electrode is composed of core-shell composite particles prepared from lithium cobalt oxide and a lithium-rich manganese-based material through a spray drying method, the negative electrode is a lithium titanate coated three-dimensional porous graphene skeleton loaded silicon carbon composite material, and the lithium titanate coated three-dimensional porous graphene skeleton loaded silicon carbon composite material is a lithium titanate coated three-dimensional porous graphene skeleton loaded silicon carbon composite material. The electrolyte comprises lithium bis (trifluoromethylsulfonyl) imide, fluoroethylene carbonate and 1, 3-propane sultone, and the packaging body sequentially comprises a polyether-ether-ketone high-temperature-resistant layer, a nanometer aluminum oxide enhanced aluminum foil and a modified polypropylene heat sealing layer from inside to outside. Through modification of positive and negative electrode materials, optimization of an electrolyte and improvement of a packaging process, the energy density, the fast charging performance, the safety, the cycle life and other aspects are remarkably improved, and the defects of a traditional soft package battery are effectively overcome.

The invention discloses a lithium titanate battery, and relates to the technical field of batteries. The battery comprises a positive electrode, a negative electrode, an electrolyte and a diaphragm, and an addition product synthesized by dimethyl fumarate and benzidine according to a specific molar ratio is added into the electrolyte as a viscosity modifier, so that the viscosity increasing trend of the electrolyte at a low temperature is effectively reduced, and the migration rate of lithium ions is improved. And the electrolyte also comprises a lithium salt, an organic solvent and an auxiliary additive, so that the low-temperature performance and the cycling stability of the battery are favorably optimized. A positive active material is one or more of lithium iron phosphate, lithium manganate, lithium cobalt oxide or nickel manganese cobalt ternary materials, a negative active material is lithium titanate, and additives such as lithium nitrate and fluoroethylene carbonate are further combined, so that the capacity retention ratio and the charge-discharge efficiency of the battery in an extreme low-temperature environment of-40 DEG C are remarkably improved. The lithium titanate battery provided by the invention has excellent low-temperature adaptability, safety and long cycle life, and is applicable to power batteries and energy storage systems in alpine regions.

The invention discloses a negative pole piece and a secondary battery prepared from the negative pole piece, and belongs to the technical field of electrochemical energy storage, the negative pole piece takes a compound of silicon-based particles and graphite particles as an active material, and meanwhile, a coating layer containing lithium titanate is arranged on the surfaces of the graphite particles, so that the ionic crosstalk phenomenon of a traditional silicon-carbon negative pole is effectively avoided, the dynamic performance is excellent, and the service life is long. And ideal stability and fast charging performance can be realized when the lithium ion battery is applied to a secondary battery.

The invention discloses a method for preparing a carbon-coated lithium titanate negative electrode material by a one-step solid phase method, and belongs to the technical field of lithium ion battery materials. The method comprises the following steps: uniformly mixing and dispersing carbon-containing lithium salt, titanium salt and metal hydride to obtain a solid mixture; and roasting the obtained solid mixture in a protective atmosphere to obtain the carbon-coated lithium titanate negative electrode material. According to the preparation method, a certain amount of metal hydride is added into the reaction raw materials, a high-temperature solid-phase method is used, and carbon in the carbon-containing lithium source is reduced by the metal hydride to serve as a carbon source, so that the carbon-coated lithium titanate negative electrode material can be directly synthesized in one step, additional carbon sources and technological processes are not needed, and the preparation technology is greatly simplified.

The invention discloses a preparation method of a modified lithium titanate battery negative electrode material. The preparation method comprises the following steps: S1, weighing zirconium chloride and benzoic acid, dissolving the zirconium chloride and benzoic acid in N, N-dimethylformamide, and mixing to obtain a first solution; s2, weighing 2, 2 '-bipyridine-5, 5'-dicarboxylic acid formic acid, dissolving the 2, 2 '-bipyridine-5, 5'-dicarboxylic acid formic acid into N, N-dimethylformamide, and mixing to obtain a second solution; s3, adding the first solution into the second solution, uniformly mixing, and reacting to obtain a third solution; s4, the third solution is subjected to suction filtration, washing and drying, and powdery UiO-bpy is obtained; s5, weighing lithium titanate powder and UiO-bpy, dissolving the weighed lithium titanate powder and UiO-bpy in ethanol to obtain a fourth solution, and drying the fourth solution to obtain an intermediate sample; and S6, heating the intermediate sample in a tubular furnace under the protection of Ar atmosphere, and cooling to obtain the battery negative electrode material UiO-bpy (LTO), thereby solving the problems of low electronic conductivity, poor rate capability and insufficient energy density of the lithium titanate (LTO) negative electrode material.

The application relates to an aluminum-doped lithium titanate-coated ternary positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: adding metal salt solution, precipitant solution and complexing agent solution into a bottom liquid in parallel flow, and performing a coprecipitation reaction under stirring conditions; after the coprecipitation reaction is completed, the temperature and stirring speed are kept unchanged, aluminum-titanium solution, precipitant solution and ammonia solution are continuously mixed in parallel flow, and a spherical hydroxide is obtained after the reaction is completed; solutes in the aluminum-titanium solution include aluminum salt, titanium salt and hydrogen peroxide; a lithium source is mixed with the spherical hydroxide, and preheating treatment and heat treatment are sequentially performed to obtain the aluminum-doped lithium titanate-coated ternary positive electrode material. The preparation method adds the aluminum-titanium solution in the coprecipitation reaction process, forms an aluminum-doped lithium titanate precursor, and thus the aluminum-doped lithium titanate-coated ternary positive electrode material is obtained through heat treatment, and the interface stability is improved.

The invention discloses a chromium-site high-entropy chromium lithium titanate material as well as a preparation method and application thereof, and belongs to the technical field of electrochemical energy storage materials. The crystal structure of the chromium-site high-entropy chromium lithium titanate material is a single spinel solid solution phase, and the chemical general formula of the chromium-site high-entropy chromium lithium titanate material is Li (Cr < 1-x-y-z-w > V < x > Fe < y > Mn < z > Al < w >) TiO4. According to the preparation method, chromium trioxide serves as an oxidizing agent, carbohydrate serves as a reducing agent, and rapid synthesis is achieved through a one-step combustion method. The process is simple and efficient, and the prepared chromium-site high-entropy chromium lithium titanate material has relatively high specific capacity and excellent cycling stability and can be applied as a lithium ion battery negative electrode material. According to the invention, the problems of limited theoretical capacity and poor rate capability of the existing chromium lithium titanate material are effectively solved, and a new way is provided for developing a high-performance lithium ion battery negative electrode material.

The invention discloses a cross-battery few-sample early prediction method and system based on physical knowledge, and the method comprises the steps: obtaining the test data of a target battery through an accelerated aging experiment, and training a general life prediction model based on an iTransform architecture through a public data set; an improved dynamic time warping algorithm is provided to realize capacity ratio alignment of degradation tracks of the target battery and the reference battery, and a characteristic difference value sequence representing systematic deviation is extracted; further constructing a deviation prediction model of multi-task learning, and synchronously optimizing three sub-tasks of feature reconstruction, physical feature prediction and health state deviation estimation through an adaptive loss weight adjustment mechanism; and finally, carrying out personalized correction on the general prediction result through a double-model fusion strategy. According to the invention, the cross-battery degradation track prediction of the lithium titanate battery of the high-speed train is completed, the prediction accuracy and generalization are improved, and a reliable technical means is provided for the health management of the battery.

The invention provides a CeO2 / RGO / LTO ternary composite material capable of being used as a negative electrode of a lithium ion battery and a preparation method and application of the CeO2 / RGO / LTO ternary composite material in the technical field of lithium battery electrode materials, and the CeO2 / RGO / LTO ternary composite material is formed by ternary compounding of cerium dioxide, reduced graphene oxide and lithium titanate. By means of step design, morphology control and interface construction, it is ensured that all components are evenly distributed, a strong synergistic effect is generated, the electrochemical performance of lithium titanate is remarkably improved, the problems that lithium titanate is low in conductivity and rapid in capacitance fading are solved, solidified lithium ions are converted into oxide with a stable structure, and the technical effect of restraining gas production is achieved. And the lithium ion battery is expected to be used for high-power and long-life lithium ion batteries, and particularly shows huge potential in the field with extremely high requirements on safety and fast charging performance.

The invention relates to the technical field of lithium ion batteries, and provides a negative plate and a lithium ion battery. The negative plate comprises a negative current collector and a negative active layer arranged on at least one side surface of the negative current collector, the negative active layer comprises a first active layer and a second active layer, and the second active layer is located between the negative current collector and the first active layer; the first active layer comprises a first active material, the first active material comprises lithium titanate, the second active layer comprises a second active material, and the second active material comprises a graphite material; after the negative plate is rolled, the porosity of the first active layer is recorded as A%, and the porosity of the second active layer is recorded as B%; a < B. The negative plate can effectively improve the rapid charging capability of the negative plate, reduce the lithium precipitation risk of the negative plate in the rapid charging process, improve the safety performance of the battery and prolong the cycle life of the battery.

The application relates to a negative pole piece, an electrochemical device and an electronic equipment, and belongs to the technical field of electrochemical energy storage. The negative pole piece comprises a negative pole current collector and a first active layer, a second active layer and a third active layer arranged on at least one surface of the negative pole current collector in sequence; the first active layer comprises a first active material, and the first active material comprises first silicon carbon and graphite; the second active layer comprises a second active material, and the second active material comprises second silicon carbon; and the third active layer comprises a third active material, and the third active material comprises hard carbon and lithium titanate. The negative pole piece provided by the application solves the problem of unstable interface of high-silicon materials, enables the battery to maintain high energy density, improves the cycle life, and inhibits lithium precipitation.

Lithium-ion cell (1) for an energy storage device of a motor vehicle, with at least one anode (3), at least one cathode (4), an electrolyte and a separator (7) arranged between the cathode (4) and the anode (3) in the electrolyte, and with a reference electrode (8) made of lithium titanate for determining a voltage potential of the lithium-ion cell (1), wherein the reference electrode (8) is pressed from lithium titanate powder, characterized in that the reference electrode (8) is pressed directly onto the separator (7).

The invention discloses a silicon-carbon composite negative electrode material and a preparation method thereof, the silicon-carbon composite negative electrode material comprises a core-shell active unit, a conductive network layer and a composite coating layer, the core-shell active unit is a structure formed by loading boron-doped silicon quantum dots in hollow carbon spheres; the composite material is prepared from the following components in percentage by mass: 11 to 18 weight percent of boron-doped silicon quantum dots, 24 to 36 weight percent of hollow carbon spheres, 31 to 42 weight percent of polyimide-derived nitrogen-doped carbon nanofibers, 3 to 8 weight percent of fluorophosphate-aluminum oxide composite coating layer and 2 to 5 weight percent of lithium titanate modified montmorillonite, the mass ratio of fluorophosphate to aluminum oxide in the fluorophosphate-aluminum oxide composite coating layer is 3: 1, the particle size of the boron-doped silicon quantum dots is 2-5nm, the doping amount of the boron element is 1-3at%, and the purity is not lower than 99.95%. The core-shell structure is used for buffering silicon expansion, the nitrogen-doped carbon fiber is used for constructing a high-efficiency conductive network, the composite coating layer is used for stabilizing an interface, and the inorganic dispersed phase is used for inhibiting agglomeration, so that the specific capacity, the cycling stability and the first charge-discharge efficiency of the lithium ion battery are remarkably improved.

The invention discloses a positive electrode material, a preparation method and application, the positive electrode material comprises a matrix and lithium titanate coated on part of the surface of the matrix, and the matrix is aluminum-doped lithium cobalt oxide. According to the positive electrode material disclosed by the invention, an aluminum-doped lithium cobalt oxide material (Al-LiCoO2) is taken as a matrix, and the matrix is coated and modified by adopting lithium titanate, so that the interface stability of the material is remarkably improved. Specifically, the surface of the substrate is not completely covered by lithium titanate, the surface, not covered by lithium titanate, of the substrate is exposed outside, and the surface can make contact with electrolyte in the electrochemical cycle process to generate AlF3, so that the exposed surface of the substrate is covered by AlF3; the composite coating layer formed by the lithium titanate and the AlF3 can effectively inhibit the continuous reaction between the positive electrode material and the electrolyte, so that the positive electrode material has relatively high interface stability.

The invention provides a positive electrode material and a preparation method thereof, an electrochemical device and electronic equipment, and particularly relates to the technical field of battery materials. The positive electrode material comprises an inner core and a shell, wherein the inner core is selected from active substances capable of reversibly embedding and removing lithium ions; the surface of the inner core is coated with the shell, the material of the shell comprises Li4Ti5-xMxO12, x is more than 0 and less than or equal to 0.3, and M comprises one or more of V, Ta and Nb. The transition metal element doped lithium titanate shell is constructed on the surface of the common positive electrode active material, so that the cycle performance of the positive electrode active material can be effectively improved.

The invention relates to composite ceramic, a preparation method thereof, aluminum segregation purification equipment and an aluminum segregation purification method. The preparation raw materials of the composite ceramic comprise silicon nitride, lithium titanate and silicon carbide. The composite ceramic is high in mechanical property, high in thermal conductivity and good in chemical stability and can be used as a crystallization rod in aluminum segregation and purification equipment for segregation, crystallization and purification of aluminum, and the crystallization rod made of the composite ceramic has longer service life compared with a graphite crystallization rod, so that the replacement frequency of the crystallization rod can be reduced, and the production cost is reduced. And the cost of aluminum segregation extraction is reduced.

The application discloses a lithium titanate battery power test method and belongs to the technical field of battery performance test. The method solves the problem that the existing battery power density test method cannot be applied to the continuous pulse power discharge working condition. The application comprises the following steps: based on the HPPC method, adjusting the pulse discharge test time to 18s, standing for 40s-5min, and subtracting the 18s discharge cutoff voltage from the voltage after standing; alternately charging or discharging the battery in the test, discharging for 10s, charging to the capacity consistent with that before discharging, recording the voltage, and calculating the power capacity; calculating the power change curve at different discharge times; the internal resistance obtained by the test presents a trend of first increasing and then decreasing with the increase of the discharge time, which is affected by the cell polarization and temperature rise; the JEVS method is used to obtain the maximum charging or discharging current; and the power verification of the final result is performed. The application is used for the battery power density test under the continuous pulse power discharge working condition.

The invention discloses a preparation method of a carbon-coated lithium titanate composite silicon negative electrode material, which comprises the following steps: mixing raw materials, carrying out two-stage high-temperature calcination, converting a lithium source and a titanium source into lithium titanate, carrying out disproportionation reaction to convert silicon monoxide into silicon simple substance silicon dioxide, removing silicon dioxide by acid etching, and carrying out carbon coating by chemical vapor deposition to obtain the carbon-coated lithium titanate composite silicon negative electrode material. A final product is obtained. The porous lithium titanate has the characteristics of zero volume expansion, high safety, long service life and low energy density, and the nano silicon has the characteristics of high specific capacity, large volume expansion and poor cycle performance, so that the comprehensive performance of high capacity, long cycle and high safety is finally realized by utilizing the synergistic effect of the porous lithium titanate and the nano silicon; compared with a silane chemical vapor deposition silicon process, the process is safe and low in cost; compared with a process of respectively preparing porous lithium titanate and nano silicon and then mixing, the preparation method disclosed by the invention has the advantages that the problem that nano silicon is easy to agglomerate is avoided, and the electrochemical performance of a finished product is effectively improved.

The invention provides a secondary battery and an electric device. The secondary battery comprises a negative electrode piece, the negative electrode piece comprises a current collector and a negative electrode film layer located on at least one surface of the current collector, the negative electrode film layer comprises a negative electrode material, and the negative electrode material comprises a negative electrode active material and a lithium dendrite consuming material; the negative electrode active material comprises at least one of graphite, hard carbon, soft carbon, a silicon-based material, a tin-based material and lithium titanate, the lithium dendrite consuming material is located on at least one part of the surface of the negative electrode active material, and the oxidation potential of the lithium dendrite consuming material is greater than or equal to 1V. In the negative electrode material, through the introduction of the lithium dendrite consuming material, the lithium dendrite consuming material can react with the lithium dendrite when the lithium dendrite is generated, and further growth of the lithium dendrite is avoided, so that the lithium precipitation phenomenon can be effectively avoided, and the cycle performance of the secondary battery is improved.

The utility model provides a lithium titanate slurry preparation device which comprises a treatment tank, the inner side wall of the treatment tank is rotatably connected with a dispersion box, the inner side wall of the dispersion box is rotatably provided with a first dispersion disc and a second dispersion disc respectively, the top end of the treatment tank is slidably connected with two connecting frames, and one ends of the two connecting frames are fixedly provided with a top frame; the slurry dispersing device has the beneficial effects that the slurry in the dispersing box is in a rolling annular flow during rotation and generates a strong vortex through the rotation of the arranged dispersing box for treating the slurry and the non-rotation of the first dispersing disc in the dispersing box and the reverse rotation of the second dispersing disc; under the action of centrifugal force, slurry is extruded out of meshes of the first dispersion disc and the second dispersion disc to form a turbulent flow area, the slurry and particles are strongly sheared and impacted, an upper beam and a lower beam are formed outside the area, and the slurry is fully circulated and turned over, so that the dispersion effect is achieved, and the slurry treatment efficiency of the whole preparation device is improved.

The invention discloses a positive and negative electrode interface cooperative processing method of an LTO-LMFP all-solid-state battery. The method comprises the following steps: preparing a lithium titanate negative electrode material by adopting a solid phase method or a hydrothermal method; mixing the prepared lithium titanate powder with a lithium phosphate precursor according to a certain proportion; after mixing, carrying out heat treatment on the mixture to promote the lithium phosphate to uniformly form a coating layer on the surfaces of the lithium titanate particles; a coprecipitation method or a solid-phase method is adopted to prepare the lithium manganese iron phosphate positive electrode material, so that the interface impedance is obviously reduced, and the physical contact and chemical compatibility between the electrode material and a sulfide solid electrolyte are effectively improved through a lithium phosphate coated lithium titanate negative electrode and a Mg-doped manganese phosphate coated lithium manganese iron phosphate positive electrode. The lithium phosphate and manganese phosphate coating layer is used as an interface buffer layer and can fill interface gaps, increase the effective contact area and provide a more stable ion transmission channel, so that the interface impedance between the positive electrode and the negative electrode and the solid electrolyte is greatly reduced, and rapid migration of lithium ions is promoted.