26 results about "Strong electrolyte" patented technology

The application provides a modified PEO-based composite solid-state electrolyte and a preparation method and application thereof, and the modified PEO-based composite solid-state electrolyte comprises MS2Br2, PEO and a lithium-based electrolyte, wherein the element M is at least one of Mo and Nb. The PEO-based solid-state electrolyte is modified by using MS2Br2, so that the conductivity of the PEO-based solid-state electrolyte can be effectively improved, the interface stability of the electrolyte and the negative electrode is enhanced, and then the electrical performance and the cycle performance of the solid-state electrolyte battery are improved.

The invention discloses a layered sulfide sodium-ion battery positive electrode material and application, and belongs to the technical field of sodium-ion battery positive electrode materials, the layered sulfide sodium-ion battery positive electrode material comprises a two-dimensional layered compound Na2AgSbS3, and can also comprise a carbon-based material. The preparation method of the two-dimensional layered compound Na2AgSbS3 comprises the following steps: mixing a silver source, an antimony source, a sulfur source and a sodium source, dissolving to obtain slurry, uniformly dispersing the slurry, sealing, heating at 150-180 DEG C for 110-130 hours, and purifying the obtained product to obtain the two-dimensional layered compound Na2AgSbS3. The layered sulfide sodium ion battery positive electrode material disclosed by the invention is excellent in structural stability, rich in intrinsic sodium and high in first efficiency, has high-potential oxidation-reduction activity, is beneficial to rapid transportation of Na < + > due to a layered channel, and is high in electrolyte compatibility and wide in application prospect.

The application belongs to the technical field of lithium ion batteries, and specifically provides a C9H7F3O3 modified LLZTO-based PEO composite solid electrolyte and a preparation method thereof, to solve the problem that the PEO-based solid electrolyte in the prior art is prone to lithium dendrite puncture in the cycle process. The application introduces C9H7F3O3 (4-methoxy-2-trifluoromethylbenzoic acid) as a modifier. Due to its unique bifunctional structure, on the one hand, the carboxyl group can undergo acid-base neutralization reaction with the main impurities on the surface of LLZTO, eliminating the serious passivation of high impedance impurities on the interface, and enhancing the interface stability of the electrolyte to lithium metal; on the other hand, the trifluoromethyl group optimizes the lithium ion transmission mechanism by virtue of its strong electron-withdrawing ability and unique "weak solvation" effect; at the same time, the trifluoro group also helps to induce the construction of a stable solid electrolyte interface film rich in LiF, and cooperatively inhibits the growth of lithium dendrites, thereby significantly improving the cycle life of the all-solid-state lithium ion battery.

The invention relates to the technical field of cross-linking agents, and discloses a preparation method of a high-performance covalent cross-linking agent for acid fracturing, which comprises the following steps: dissolving cyanuric chloride in an organic solvent at low temperature, adding aliphatic primary amine, and adding an alkaline neutralizer to maintain the pH value to prepare a monochloro substituted intermediate solution; polyfunctional amine is added for polycondensation, the volume fraction of the mixed solvent is adjusted so that the solubility parameter can be matched with the hyperbranched skeleton, and a hyperbranched intermediate is prepared by controlling the branch growth rate through solvation; the surface shielding steric hindrance layer is constructed by adopting zwitterionic amine and hydrophobic tertiary amine for surface modification, conformation extension of a zwitterionic structure under strong electrolyte is used for counteracting molecular chain shrinkage, thermal collapse is inhibited by combining hydrophobic association microdomain and skeleton rigidity, and the crosslinking activity in a high-temperature acid environment is maintained.

This invention relates to the field of metal oxide technology, specifically to a highly dispersed nano-gadolinium oxide and its preparation method. The preparation method includes: activating surface sites through weak acid etching, pulsed ultrasonic depolymerization, and hydrothermal re-hydroxylation; adsorption using a polycarboxylic acid chelating agent; introducing hydrophobic chains and tertiary amine groups through sequential amidation; forming a strongly hydrated outer layer through beet alkalization; and finally, ultrafiltration desalting and concentration. The nano-gadolinium oxide dispersion obtained by this method has advantages such as narrow particle size distribution, low viscosity, good storage stability, and strong electrolyte resistance, making it suitable for high-end applications such as polishing slurries and coating precursors.

The invention relates to the field of negative electrode materials, and provides a super-capacity and overpressure graphite negative electrode material which is prepared by modifying graphite through organic amine hydrochloride, so that the surface of the graphite carries a certain amount of active groups, and the active groups are chemically bonded with resin which is subsequently coated on the surface of the graphite, so that the super-capacity and overpressure graphite negative electrode material is obtained. The chemical bonding greatly enhances the interface bonding strength of the resin and the graphite, the resin forms a coating layer with a stable structure on the surface of the graphite, and the negative electrode material obtained after graphitization treatment has the characteristics of high capacity, high compaction, good rate capability, strong electrolyte compatibility and the like.

The invention provides a sulfide composite electrolyte membrane and a preparation method thereof, and belongs to the technical field of electrolyte. The sulfide composite electrolyte membrane provided by the invention comprises the following components in percentage by mass: 1-3wt% of polytetrafluoroethylene; 0.5 to 2 weight percent of sulfydryl-polyethylene glycol-amino; and the balance of sulfide electrolyte. According to the invention, sulfydryl-polyethylene glycol-amino is used as an interface stabilizer to coordinate lithium ions in sulfide electrolyte to form a dynamic interface layer and relieve stress concentration, and sulfydryl and metal elements in a high-voltage positive electrode form a stable disulfide bond, so that interface contact between an electrolyte layer and an electrode layer is enhanced; amino groups are combined with hydroxyl groups on the surface of the positive electrode through hydrogen-bond interaction, so that interface side reaction is inhibited, and interface degradation of sulfide electrolyte and the high-nickel positive electrode is inhibited through the synergistic effect of sulfydryl and amino groups; in addition, polytetrafluoroethylene is added as a fibrosis agent, and a three-dimensional fiber network is formed through shear induction, so that the mechanical strength of the electrolyte membrane is enhanced.

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 present invention relates to a secondary battery manufacturing apparatus and manufacturing method, and, more particularly, to a secondary battery manufacturing apparatus and manufacturing method, which are capable of effectively performing degassing and enhancing impregnation for an electrolyte. According to one embodiment of the present invention, the secondary battery manufacturing method can be provided, the method comprising: a filling step of filling a battery case with an electrolyte; an insertion step of inserting an electrode assembly into the battery case; and a degassing step of connecting an adapter to the electrode assembly, transmitting excitation of the adapter to the electrode assembly, and exciting the electrolyte through the electrode assembly so as to degas same.

The invention discloses a bionic cocklebur fruit-shaped Mo modified Na2Mn8O16 nano material and a preparation method thereof, and belongs to the field of inorganic nano materials. The preparation method comprises the following steps: dissolving sodium molybdate dihydrate, potassium permanganate and urea in deionized water, and carrying out hydrothermal reaction, filtering, drying and calcining treatment to obtain a target product. The material presents a unique bionic multi-thorn structure in microstructure, the surface is provided with densely distributed burr-shaped protrusions, the length of the protrusions is about 30-50 nm, and the protrusions are radially arranged to form an open system with a high specific surface area. Through Mo modification and synergetic thorn morphology, the permeability of the electrolyte and the zinc ion migration rate are remarkably enhanced, and the conductivity and the structural stability of the material are effectively improved, so that the material shows excellent electrochemical performance. The process is simple, and the prepared material has a good application prospect in the field of zinc ion battery positive electrodes.

This invention relates to a bipolar membrane electrodialysis method for preparing lithium hydroxide from lithium malate, employing a two-compartment bipolar membrane electrodialysis system. First, a lithium malate solution is introduced into the acid-producing chamber, deionized water into the alkali-producing chamber, and a strong electrolyte solution into the anode and cathode chambers. Then, current is applied to both sides of the anode and cathode plates for electrodialysis, resulting in high-purity lithium hydroxide in the alkali-producing chamber and high-purity malic acid in the acid-producing chamber. This method produces high-purity lithium hydroxide with few impurities. The H2Ma cycle generated in the acid-producing chamber maximizes lithium resource utilization with minimal waste, achieving utilization of all raw materials and products in the entire lithium hydroxide preparation process. It is environmentally friendly, highly efficient, and produces virtually no pollutants. The current efficiency of the entire lithium hydroxide preparation process is 40-63%, and the energy consumption is 17-39 kWh / kgLiOH. This method has significant economic value and importance for the recycling of waste lithium batteries, representing a simple and green method for lithium recovery.

The application discloses a sulfide solid-state electrolyte based on a grain boundary engineering and a molecular bridging in-situ gradient interface layer and a preparation method thereof, and belongs to the technical field of solid-state battery materials. The method is characterized in that: firstly, a silane-polyethylene glycol-mercapto coupling agent is used to perform surface modification on a grain boundary modifier, so that the coupling agent is anchored and mercapto active sites are reserved; secondly, the modified modifier is ball-milled with a sulfide electrolyte, and the grain boundary is activated and annealed to reserve coupling activity; then, the ball-milled modified modifier is ball-milled with a phosphorus-free sulfide precursor, and a chemical bridging is formed between the mercapto and the precursor, so that the precursor is uniformly adsorbed in the grain boundary in a directional manner; finally, a phosphorus-free sulfide interface layer with a gradient change in composition and density is generated in-situ through gradient heat treatment. The application can enhance the air stability of the electrolyte and the electrode compatibility, and solves the problems of weak bonding force, easy peeling and high interface impedance of a traditional coating layer.

The invention provides a solid electrolyte membrane and a preparation method thereof, and belongs to the technical field of electrolyte. The preparation method comprises the following steps that taurine is used for modifying polydopamine nano-particles to obtain modified polydopamine nano-particles, then sulfide electrolyte, polytetrafluoroethylene and the modified polydopamine nano-particles are compounded to prepare the electrolyte membrane, the polytetrafluoroethylene enhances the cohesive force of the electrolyte particles, and the electrolyte membrane is formed by compounding the sulfide electrolyte, the polytetrafluoroethylene and the modified polydopamine nano-particles. The modified polydopamine nanoparticles enhance the cohesion of the electrolyte particles, the mechanical strength of the electrolyte membrane can be remarkably enhanced through the cooperation of the modified polydopamine nanoparticles and the electrolyte particles, meanwhile, the lithium ion transmission performance is enhanced through taurine modified polydopamine, and finally the composite electrolyte membrane which is high in ionic conductivity and capable of effectively resisting lithium dendrite puncture can be obtained.

The invention discloses an ultrasonic detection device and method for electrolyte infiltration conditions of a lithium ion soft package battery, and belongs to the field of ultrasonic nondestructive detection of batteries. Comprising a linear ultrasonic phased array sensor, a multi-channel ultrasonic excitation acquisition module, a three-axis motion control module and upper computer software. The sensor part adopts a wheel type phased array sensor made of sound transmission rubber, and is characterized by dry coupling, that is, a detected battery does not need to be immersed in a liquid coupling agent, so that the damage to a battery sample is eliminated. In addition, for electrolyte infiltration detection, traditional X-rays and infrared rays have strong penetrating power to electrolyte, so that the electrode infiltration distribution condition cannot be visually detected. The method has the following advantages that 1) the non-charge-discharge solid-state coupling type ultrasonic phase control C scanning imaging of the lithium ion soft package battery production line can be realized, and 2) the method has the detection advantages of low detection cost, high safety coefficient, non-intrusive detection, high working efficiency and the like.

The invention relates to a method for preparing graphene quantum dots, which comprises the following steps of: preparing retired graphite into a positive electrode and a negative electrode, immersing one end of the positive electrode and one end of the negative electrode into electrolyte, respectively communicating the other ends of the positive electrode and the negative electrode with the positive electrode and the negative electrode of an external circuit, and electrifying for electrolysis to obtain the graphene quantum dots, wherein the electrolyte is deionized water, a volatile weak electrolyte or a volatile strong electrolyte of which the concentration is less than or equal to 0.002 M. According to the method, the retired graphite is used as the positive electrode and the negative electrode, the graphene quantum dots are prepared through electrolysis in the deionized water or the volatile weak electrolyte or the volatile low-concentration strong electrolyte, the preparation process conditions are simple, impurities in a reaction system are few, and the graphene quantum dots can be obtained by directly drying the electrolyzed solution; and the problems of impurity removal process and difficulty in treatment of waste liquid generated by the existing method are avoided.

The invention provides a composite solid-state electrolyte membrane, a solid-state lithium battery and a preparation method of the solid-state lithium battery, and relates to the technical field of solid-state batteries. According to the composite solid electrolyte membrane provided by the invention, the crosslinking additive is introduced to react with the polymer matrix, so that a stable crosslinking network structure is constructed in the membrane. And the cross-linked network structure can effectively enhance the interaction force between polymer chain segments and resist external stress, so that the mechanical strength and toughness of the electrolyte membrane are remarkably improved. And due to the enhancement of the mechanical property, even if the electrolyte membrane is ultrathin, the puncture of lithium dendrites can be effectively inhibited, so that the key of long cycle stability of the battery is realized. The formation of a cross-linked network structure possibly fixes the orientation of a polymer chain segment to a certain extent, and cooperates with an inorganic fast ion conductor filler to provide more continuous and efficient transmission channels for lithium ions, and possibly contributes to reducing the activation energy of ion migration, thereby generating positive influence on the ionic conductivity.

The application provides a composite electrode, a preparation method thereof and a full solid-state battery. The composite electrode comprises: a pole piece; and a composite electrolyte film arranged on the surface of the pole piece, wherein the composite electrolyte film comprises a first layer of electrolyte film close to one side of the pole piece and a second layer of electrolyte film adjacent to the first layer of electrolyte film and located away from the other side of the pole piece, the first layer of electrolyte film contains lithium salt, inorganic electrolyte and polymer, and the second layer of electrolyte film contains sulfide electrolyte, a binder and a dispersing agent. According to the composite electrode provided by the application, the coating of the electrolyte on the pole piece is uniform and reliable, and the mechanical strength of the electrolyte film as a whole is enhanced.

The invention relates to the technical field of batteries, in particular to an electrode assembly, an electrochemical device and a manufacturing method of the electrode assembly. The first diaphragm comprises first folding areas and a first connecting area, the two first folding areas are connected through the first connecting area, the first folding areas and the first connecting area are arranged in the first direction, and the first direction is parallel to the length direction of the electrode assembly. The second diaphragm comprises second folding areas and second connecting areas, the two second folding areas are connected through the second connecting areas, the second folding areas and the second connecting areas are arranged in the second direction, a plurality of adjacent and mutually isolated mounting spaces are formed between the first diaphragm and the second diaphragm, and the mounting spaces are arranged in the thickness direction of the electrode assembly. And the anode plates and the cathode plates are alternately arranged in different mounting spaces. The mounting space formed by continuously folding the first diaphragm and the second diaphragm can respectively lock the electrolyte from the first direction and the second direction, so that the residual capacity of the electrolyte is high, and the infiltration degree of the electrode assembly can be increased to a certain extent.

The application discloses a preparation method of a positively charged nanofiltration membrane based on a strong electrolyte monomer, the nanofiltration membrane and application, and relates to the technical field of membrane separation. The positively charged nanofiltration membrane for magnesium / lithium ion separation is obtained by taking a cationic strong electrolyte monomer as an aqueous monomer and performing an interfacial cross-linking reaction of the strong electrolyte monomer with trimesoyl chloride on the surface of an ultrafiltration membrane. The strong electrolyte monomer adopted in the application contains a positive charge group and a reactive amino / hydroxyl functional group at the same time, and the prepared positively charged nanofiltration membrane has a high flux and can effectively separate magnesium ions and lithium ions. The preparation method provided by the application is simple in process and easy to operate, provides a reference direction for preparing a high-performance positively charged magnesium-lithium separation nanofiltration membrane, and has a good application prospect.

The invention relates to the technical field of quality detection, and discloses a machine vision-based inorganic acid finished product quality detection method, which comprises the following steps of: acquiring a bubble image sequence under a specific stirring entrainment working condition, and extracting a center coordinate set and an average radius of bubbles through image processing; determining the wave number of a structural ring in the frequency domain according to the average radius, wherein the wave number corresponds to the spatial feature scale of the bubble near-contact pairing; based on the center coordinate set, calculating a second-order angle harmonic normalization amplitude of the structure factor at the wave number of the structure ring to obtain a second-order anisotropy coefficient of the structure ring for representing the orientation order degree of the bubble group in the stirring flow field; and finally, comparing the coefficient with a preset quality threshold value to judge whether a finished product is qualified or not. By capturing frequency domain fingerprints generated by strong electrolyte inhibition and combination effect and flow field shearing, the defect that traditional vision is insensitive to microcosmic physicochemical properties is effectively overcome, and non-contact and high-precision online monitoring of inorganic acid finished product quality is realized.

The application belongs to the technical field of lithium ion batteries, and particularly relates to a composite solid electrolyte membrane for lithium batteries and a preparation method thereof. The polyimidazole salt and modified mesoporous molecular sieve are used as additives of the solid electrolyte membrane. The polyimidazole salt is synthesized by using a Debus-Radziszewski reaction, and the polyimidazole salt has alkyl chains with different carbon atom numbers in the main chain. The appropriate carbon chain length can effectively enhance the ion conductivity and flexibility of the electrolyte membrane. The modified mesoporous molecular sieve has an ordered pore structure, a large specific surface area and good dispersibility, and can enhance the mechanical strength of the solid polymer electrolyte, improve the ion conductivity and cycle stability of the lithium ion battery. The two synergize, greatly improving the ion conductivity and flexibility of the electrolyte membrane.

The invention relates to the technical field of metal oxides, in particular to high-dispersion nano gadolinium oxide and a preparation method thereof. The preparation method comprises the following steps: activating surface sites through weak acid denudation, pulse ultrasonic depolymerization and hydrothermal rehydroxylation; adsorbing by adopting a multi-carboxyl chelating agent; introducing a hydrophobic chain and a tertiary amine group through differential amidation; a strongly hydrated outer layer is formed through beet alkalization; and finally carrying out ultrafiltration desalination and concentration. The nano gadolinium oxide dispersion liquid obtained by the method has the advantages of narrow particle size distribution, low viscosity, good storage stability, strong electrolyte resistance and the like, and is suitable for high-end applications of polishing slurry, coating precursor liquid and the like.

The invention relates to a collagen degerming and filtering method. The collagen degerming and filtering method comprises the following steps: 1) dissolving collagen in a solvent containing a strong electrolyte to realize depolymerization; and (2) putting the depolymerized collagen solution into a uniform electric field, and filtering by using a hydrophilic filter membrane with the pore diameter of 0.22 mu m under the constant pressure of 0.1-0.5 MPa. The amphiphilic structure characteristic of collagen molecules is utilized, electrostatic interaction among the molecules is destroyed through a strong electrolyte solution, the collagen is prevented from self-assembling to form a fiber aggregate, and the collagen is stabilized in a monomolecular dispersion state; and the external electric field utilizes the dipole moment characteristic of collagen molecules, so that long axes of the collagen molecules are directionally arranged along the direction of the electric field. Due to directional arrangement, transverse winding of molecules on the surface of the filter membrane is avoided, the problem of blockage caused by molecular aggregation in traditional filtration is fundamentally solved, the service life of a single filter membrane is greatly prolonged, the handling capacity of the single filter membrane is greatly improved, and the cost of filter consumables and the number of times of shutdown replacement are reduced.

The application provides a composite polymer solid electrolyte material and a preparation method and application thereof, and the preparation raw materials include solvent 500-1500 parts by mass, calcium copper titanate 1-40 parts by mass, electrolyte salt 20-70 parts by mass and high molecular polymer matrix 100 parts by mass. The calcium copper titanate has super-high dielectric constant, the composite polymer solid electrolyte material prepared by using the calcium copper titanate as a filler can greatly promote the dissociation of the electrolyte salt, and further improve the ionic conductivity of the composite polymer solid electrolyte; meanwhile, the calcium copper titanate with different morphologies, especially the nanorod and linear calcium copper titanate, can form a three-dimensional structure, play a role in transmitting ions and bridging, further improve the ionic conductivity and strengthen the electrolyte matrix strength; the prepared composite polymer solid electrolyte has good matching property for a battery positive electrode, and the assembled full battery has excellent rate performance and cycle performance.

The invention belongs to the technical field of solid electrolyte, and particularly relates to polyvinyl chloride composite solid electrolyte and a preparation method thereof. The polyvinyl chloride composite solid electrolyte is prepared from the following raw materials in parts by weight: 30 to 50 parts of polyvinyl chloride resin, 45 to 65 parts of PCL-based compound, 3 to 8 parts of modified CePO4, 20 to 35 parts of LiTFSI and 3 to 6 parts of propylene carbonate, the added modified CePO4 realizes uniform dispersion of an inorganic filler in a polymer matrix, so that the mechanical property of the electrolyte membrane is enhanced, and a stable channel is provided for lithium ion transmission; the PCL-based compound not only relieves the brittleness defect of a polyvinyl chloride matrix, but also improves the free lithium ion concentration through the interaction of a coordinate bond and a lithium salt, and optimizes the ion conduction efficiency. And the step-by-step curing process promotes the system to form a stable dual cross-linked network, so that the electrochemical stability and long-term cycle reliability of the electrolyte are greatly improved.

This invention provides a bio-based lithium-ion battery negative electrode adhesive, its preparation method, and its application. This invention belongs to the technical field of polymer materials for batteries. The raw materials for preparing the bio-based lithium-ion battery negative electrode adhesive include diisocyanate, macromolecular chain extender, small molecule chain extender, unsaturated end-capping agent, organic solvent, water, initiator, and amine neutralizer. The macromolecular chain extender is at least one of bio-based polyester polyol or polyether polyol, and the small molecule chain extender includes dimethylolpropionic acid. The bio-based lithium-ion battery negative electrode adhesive material of this invention has strong solvent and corrosion resistance properties, and can withstand long-term immersion in strong electrolytes without dissolving, with controllable swelling rate.