24results about How to "Reduce interface side reactions" patented technology

The application relates to the technical field of battery materials. Disclosed are a lithium nickel-manganese acid positive electrode material, a preparation method thereof, a positive electrode and a battery. The lithium nickel-manganese acid positive electrode material comprises a base material and a first coating layer and a second coating layer successively coated on the surface of the base material; the chemical general formula of the base material is Li(Li a Ni b Mn c Fe d Sb e )O 4‑x , wherein a+b+c+d+e=2, 0<=x<=0.2, 0<=a<=0.1, 0.4<=b<=0.5, 1<=c<=1.5, 0.1<=d+e<=0.4; the first coating layer comprises NbTi(PO4)3, and the mass ratio of the first coating layer to the base material is 0.1-5:100; the second coating layer comprises a carbon material, and the mass ratio of the second coating layer to the base material is 0.1-5:100. The lithium nickel-manganese acid positive electrode material provided by the embodiment of the application has excellent electrochemical performance.

The invention provides a single crystal-polycrystal composite positive electrode material and a preparation method thereof, a solid-state battery positive electrode layer and a solid-state battery, the single crystal-polycrystal composite positive electrode material comprises a single crystal positive electrode material, a polycrystal positive electrode material and a solid electrolyte material, the particle size D50 of the polycrystalline positive electrode material is larger than the particle size D50 of the single crystal positive electrode material and is larger than the particle size D50 of the solid electrolyte material; the mass ratio of the polycrystal positive electrode material to the single crystal positive electrode material is less than or equal to 1. According to the invention, through three-level grain composition and control of the mass ratio of the single-crystal positive electrode material to the polycrystalline positive electrode material, the single-crystal particles construct a rigid framework, and the polycrystalline particles and the electrolyte fill gaps, so that the contact area of the active material and the electrolyte is increased, the stack pressure is reduced, and the compaction density is improved; and meanwhile, the problems of poor interface stability, poor rate capability and high cost are solved.

This invention discloses a multi-level carbon-coated ternary composite material and its preparation method, comprising the following steps: S1: Nanoscale wet grinding of single-crystal NCM and expanded graphite, allowing NCM to be inserted between the expanded graphite layers, followed by drying to obtain mixture 1; S2: Mixing mixture 1 from S1 with medium-temperature pitch to obtain mixture 2; S3: Low-temperature sintering of mixture 2 obtained in S2, followed by crushing to obtain the multi-level carbon-coated ternary composite material. This invention embeds single-crystal NCM into the expanded graphite layers through grinding, improving the electronic conductivity of NCM and enhancing rate performance. The expanded graphite adapts to the volume expansion of single-crystal NCM during charge and discharge, maintaining close contact between materials, thereby improving cycle life. The secondary coating of the material with low-softening-point medium-temperature pitch further reduces the contact area between single-crystal NCM and the electrolyte, improving cycle stability. The medium-temperature pitch can complete carbonization at a lower temperature, avoiding the collapse of the NCM structure during high-temperature carbonization.

The invention discloses a polyurea-based gel polymer electrolyte, a synthesis method thereof and application of the polyurea-based gel polymer electrolyte in a lithium battery, and belongs to the technical field of lithium batteries. A mixture containing a polyureido polyalkenyl monomer, an electrolyte and an initiator is subjected to thermal initiation polymerization reaction to obtain the polyureido gel polymer electrolyte, and the polyureido gel polymer electrolyte integrates ureido functional groups, flame-retardant structural units and coordination polar groups and has a covalent cross-linked network and a dynamic hydrogen bond network at the same time. The composite material shows excellent mechanical properties and ion transmission capability, has intrinsic flame-retardant characteristics, and is especially suitable for preparing high-safety gel-state lithium metal batteries, lithium ion batteries and other electrochemical devices.

The application discloses an organic-inorganic composite structure for storing metal lithium and a preparation method and application thereof, relates to the technical field of battery materials, and comprises an organic film containing a polymerized ionic liquid and a three-dimensional inorganic frame structure, wherein the organic film is formed by compounding a polymerized ionic liquid, a lithium salt and an organic polymer; the polymerized ionic liquid is formed by photo-polymerization or thermal polymerization of an ionic liquid monomer composed of an imidazole ring cation containing a polymerizable functional group with a carbon-carbon double bond or a triple bond and a functional anion; and the mass ratio of the precursor monomer of the polymerized ionic liquid to the organic polymer is 1:1-1:10. The organic-inorganic composite structure for storing metal lithium and the preparation method and application thereof can provide deposition storage space for metal lithium, effectively inhibit lithium dendrite growth and volume expansion, and improve the internal structure stability and safety in the battery cycle process.

The invention relates to the field of lithium iron phosphate, in particular to a composite solid electrolyte synergistically modified lithium iron phosphate positive electrode material and a preparation method thereof. The preparation method is used for solving the problems that existing lithium iron phosphate is poor in electronic conductivity, high in interface impedance and poor and low in interface stability. The lithium iron phosphate positive electrode material synergistically modified by the composite solid electrolyte comprises COF / neodymium-doped lithium titanium aluminum phosphate modified lithium iron phosphate, acetylene carbon black, polyethylene glycol and N-methyl pyrrolidone, according to the preparation method, firstly, lithium iron phosphate is prepared, neodymium ions are doped in the process of preparing lithium titanium aluminum phosphate to serve as a first modification layer, cyanophenothiazine COF is synthesized to serve as a second modification layer, two layers of solid electrolyte are modified on the surface of the lithium iron phosphate to achieve a synergistic effect to form a protective film, and formation of lithium dendrites can be effectively reduced; the interface stability and the cycle performance of the material are remarkably improved, and the safety of the battery is enhanced.

The application discloses a negative-electrode-free sodium battery diaphragm, a preparation method and application thereof, and relates to the technical field of negative-electrode-free sodium batteries. The application forms a sandwich structure by using a positive electrode side polymer layer, a heat conduction layer and a negative electrode side polymer layer, introduces polyolefin elastomer POE into the negative electrode side polymer layer, enhances the elasticity of the diaphragm, buffers the expansion and contraction of the negative electrode side in the charging and discharging process, guarantees the close adhesion of the interface, the heat conduction layer quickly conducts heat, reduces the interface side reaction caused by the heat accumulation, avoids the loss of elasticity of the elastic layer due to high temperature aging, and the positive electrode side polymer support layer guarantees the overall mechanical strength, avoids the deformation of the diaphragm in the cycle process, and prevents the short circuit condition. The sandwich structure can effectively solve the core problems of the interface buffer adhesion and the low heat dissipation efficiency of the negative-electrode-free battery, provide sufficient mechanical strength to prevent the deformation of the diaphragm and the short circuit of the battery, and can simultaneously improve the expansion buffer effect, the heat dissipation capacity, the electrochemical performance and the gas production inhibition effect.

The invention relates to a full-carboxyl biomass gel electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing Tempo oxidized nano-cellulose dispersion liquid with sodium alginate, pouring the mixture into a mold, immersing the mold into a divalent zinc salt solution, and standing to obtain the nano-cellulose / sodium alginate gel electrolyte. According to the invention, Tempo oxidized nano-crystalline cellulose dispersion liquid and sodium alginate are mixed, and the gel electrolyte with a dual-network structure is constructed through hydrogen-bond interaction between the Tempo oxidized nano-crystalline cellulose dispersion liquid and sodium alginate and rapid metal coordination between sodium alginate and zinc ions and is used for the zinc ion battery. The stable three-dimensional network structure and rich polar carboxyl functional groups of the gel electrolyte can accelerate the transmission rate of zinc ions and adjust interface zinc ion deposition, so that the effects of inhibiting zinc dendrites and reducing interface side reactions are achieved. The method is simple, the raw materials are easy to obtain, the repetition rate is high, and the prepared gel electrolyte has high ionic conductivity and good mechanical performance.

The application discloses a kind of solid electrolyte and preparation method thereof, solid-state battery, solid electrolyte is made of polymer, and lithium salt and additive dispersed in polymer, additive includes inorganic nano-particle, plasticizer and ionic liquid, polymer is one of polyvinyl ether of formula P1 to formula P7, the number average molecular weight of polymer is 1×10 4 -10×10 4 ;Wherein, m is positive integer, Cy is cyclohexyl, i Bu is isobutyl, n Bu is n-butyl, Bn is benzyl.The polyvinyl ether used in the application is a stereoregular polymer, the main chain and side chain do not contain active hydrogen chemical groups (such as hydroxyl), which can significantly reduce the tendency of electrolyte oxidation and decomposition under high pressure, and significantly improve the electrochemical window.The electrochemical window of the solid-state battery of the application is increased to 4.8V or more.

The application discloses a sodium ion battery positive electrode material and a preparation method thereof. By adding cheap, non-toxic, environment-friendly and easily-degradable water-soluble cellulose as an additive, the growth of a specific crystal direction can be inhibited. The hydrophilic group of the water-soluble cellulose can change the coordination environment of metal ions and reduce the entry of water molecules into the crystal lattice. In addition, by introducing the water-soluble cellulose, high-concentration reactant feeding can be realized, which is beneficial to reducing the consumption of industrial water. Meanwhile, compared with other existing additives, the water-soluble cellulose is environment-friendly, easily-degradable, low in production and separation cost, and free of toxic by-product generation. The prepared open three-face cubic Fe-based Prussian blue analogue material is good in dispersity, high in purity and uniform in morphology, and as a sodium ion battery positive electrode material, has a reversible capacity of 155.40 mAhg ‑1 at 0.1C (1C=170 mAhg ‑1 ) and a first discharge coulombic efficiency of 97.83%.

The application provides a battery electrolyte, comprising an additive component, the additive component comprising a nitrogen-containing heteroatom bridged ring structure, fluorine-containing acid root ions and / or fluorine-containing imine negative ions. The application modifies the electrolyte by selecting a specific additive component to form a stable and firm CEI film on the positive electrode surface to protect the electrode structure, and introduces fluorinated anions to enhance the association of anions and electrolyte solvent molecules, so as to improve the oxidation stability of the electrolyte. The modified electrolyte can be used to solve the instability of high-nickel ternary materials during the cycle process and the problem that the traditional electrolyte is prone to oxidative decomposition at high voltage, so as to improve the cycle life and rate performance of the ternary lithium battery at high voltage. The application is helpful to improve the oxidation stability of the electrolyte, reduce the charge transfer impedance and interface impedance, improve the ion diffusion rate, and enhance the stability of the electrode material structure.

The application discloses a vanadium pentoxide-based magnesium battery positive electrode material and a preparation method thereof. The application obtains flower-spherical vanadium pentoxide through a hydrothermal reaction of an ammonium metavanadate and a mixed solution of reactants and subsequent calcination; the method has high production efficiency, is convenient to produce, has short preparation time, is low in cost and has good repeatability. The flower-spherical vanadium pentoxide nanomaterial is used as a magnesium battery positive electrode material, more surface active sites can be exposed, ion transmission channels are increased, the problem of stacking and agglomeration of vanadium pentoxide nanosheets in a cycle process is solved, the exposed (001) crystal face reduces the interface side reaction of an electrode and an electrolyte surface, the storage capacity of vanadium pentoxide is greatly improved, the vanadium pentoxide has good cycle stability and is an excellent magnesium battery positive electrode material.

This invention discloses a long-lasting, cyclic hydrogel-modified electrolyte and its preparation method, belonging to the field of aqueous zinc-ion battery technology. The electrolyte comprises a base electrolyte, additives, a crosslinking agent, and an initiator. The base electrolyte is prepared by mixing zinc salt, acrylamide, and a solvent to form a mixed solution, wherein the solvent is deionized water, and the concentration of zinc salt in the base electrolyte solution is 1-3 M. The additive is asiaticoside, with a concentration of asiaticoside in the electrolyte solution of 5-15 mM, a preferred concentration of 10 mM, and a molar ratio of asiaticoside to zinc salt of 66.7-600:1. The zinc salt is one or more of zinc sulfate, zinc chloride, zinc nitrate, zinc acetate, and zinc trifluoromethanesulfonate. This invention introduces asiaticoside as a functional additive into the electrolyte to construct a composite hydrogel electrolyte, effectively optimizing ion transport behavior, solving the problem of insufficient interfacial compatibility, and significantly improving the long-term cycle life and electrochemical stability of the battery.

This application discloses a secondary battery and an electrical device, belonging to the field of battery technology. By controlling the mass ratio of the first lithium supplementer and the second lithium supplementer, the mass ratio of cyclic carbonate to chain carbonate in the electrolyte, the mass percentage of sulfur-containing additives in the electrolyte, and the thickness of the ceramic layer in the separator to satisfy: 0.17≤W≤11.18, this application significantly improves the gas generation problem of the secondary battery, effectively improves the cycle life of the secondary battery, and reduces the DCR.

The application provides an NCM positive electrode material modified by a halide electrolyte and a preparation method, application and solid-state battery and power utilization device thereof, and relates to the technical field of solid-state batteries. A halide electrolyte layer is coated on the surface of the NCM positive electrode material. The halide electrolyte comprises Li3InCl6. The Li3InCl6 not only has excellent lithium ion transmission capacity, but also has good interface compatibility with the NCM positive electrode material, so that the interface stability of the positive electrode material and the electrolyte can be improved. The problem of poor compatibility of sulfide electrolyte with the positive electrode material, especially the problem of insufficient interface stability when in contact with a high-voltage positive electrode, is solved.

The application provides a lithium ion battery, which comprises a positive electrode sheet and an electrolyte; the positive electrode sheet comprises a positive electrode active material lithium iron phosphate; the electrolyte comprises an additive a and an additive b; the additive a comprises vinylene carbonate; and the additive b comprises a compound with a structure shown in formula (I) and a compound with a structure shown in formula (II). The two additives are used in combination, partially replace VC, reduce the addition amount of VC, and compared with the SEI formed by the reduction of VC, the SEI structure formed by the compound with the structure shown in formula (I) and the compound with the structure shown in formula (II) is more compact, the inhibition effect of the interface side reaction is stronger, and the effect of improving high-temperature cycle is better compared with VC.

This invention discloses a self-supporting cathode material, its preparation method, and its applications. The self-supporting cathode material includes a self-supporting substrate and a vanadium-based oxide layer loaded on the self-supporting substrate, wherein the vanadium-based oxide layer contains vanadium-based oxide nanofibers. When this self-supporting cathode material is used to prepare magnesium-lithium hybrid-ion secondary batteries, it exhibits high initial capacity, as well as excellent electrochemical performance such as good rate performance, cycle stability, and reversibility. The self-supporting cathode material provided by this invention is a high-performance magnesium-lithium hybrid-ion secondary battery self-supporting cathode material that can efficiently accommodate dual-ion co-intercalation and is expected to be widely used in the preparation of magnesium-lithium hybrid-ion secondary batteries.

The application belongs to the technical field of lithium ion battery recycling and regeneration, and discloses a method for repairing NCM92 positive electrode material recycling by dielectric material, wherein waste positive electrode material is pretreated to obtain NCM92 positive electrode powder; barium titanate or strontium titanate dielectric material is ground and sieved; the NCM92 positive electrode powder is divided into multiple portions, the dielectric material is mixed with the positive electrode powder in a gradient increasing adding amount, and then dried; lithium source is added to each intermediate product and uniformly mixed; finally, high-temperature sintering, crushing and sieving are performed to obtain regenerated NCM92 positive electrode material. The core of the application is that by gradient adding of the dielectric material barium titanate or strontium titanate, the bulk structure repair of the positive electrode material, the elimination of the surface residual potential and the construction of the functional coating layer are simultaneously realized in the high-temperature sintering process, so that the first efficiency, the cycle stability and the rate performance of the regenerated material are significantly improved. The method has simple process, good regeneration effect and low cost, and provides a new way for realizing high-value direct regeneration of the NCM92 positive electrode material of the retired lithium ion battery.

This invention discloses a carbon-coated zirconium-doped lithium manganese iron phosphate composite material, its preparation method, and its application, belonging to the field of functional materials technology. The chemical formula of the material is: Li 1‑ 2z Mn x Fe y Zr z PO4 / C; wherein, 0.5≤x≤0.8, 0.15≤y≤0.45, 0.005≤z≤0.05, and satisfying x+y+z=1; its preparation method includes: weighing lithium source, manganese source, iron source, phosphorus source, zirconium source and carbon source according to stoichiometric ratio, mixing them, adding solvent, and dispersing at high speed and grinding to obtain a uniform precursor slurry; after drying, pre-calcining at 300-500℃ for 2-4h under an inert atmosphere, then calcining at 650-750℃ for 6-14h, cooling, crushing and sieving to obtain carbon-coated zirconium-doped manganese iron phosphate; this material, by introducing Zr doping, utilizes its induced charge compensation mechanism and strong covalent bond pillar effect to effectively broaden the one-dimensional diffusion channel of lithium ions, significantly suppressing lattice distortion and manganese ion dissolution during charging and discharging, and obtaining high-rate kinetics and excellent long-cycle stability when used as a positive electrode for lithium-ion batteries.

This invention, entitled "A Composite Electrolyte Additive Composition, Electrolyte, and its Preparation and Application," belongs to the field of lithium-ion battery technology. The technical problem to be solved is the poor oxidative stability, low ion transference number, and poor cycle performance and high-efficiency kinetics of the electrolyte. The composite electrolyte additive composition provided by this invention comprises a nitrile compound and an aluminum alkoxide compound; the structural formula of the nitrile compound is shown in Formula I, wherein R1 is selected from substituted or unsubstituted C1-C12 straight-chain or branched saturated alkyl groups, C2-C12 alkenyl groups, C2-C12 alkynyl groups, C3-C12 cycloalkyl groups, C2-C12 alkoxyalkyl groups, unsubstituted C6-C18 aryl groups, and C6-C18 aryl groups substituted with alkyl or cyano groups; the structural formula of the aluminum alkoxide compound is shown in Formula I, wherein R2-R4 are each independently selected from alkyl groups with 1-8 carbons.

This invention discloses a magnesium battery cycle stability enhancement material, which is obtained by dissolving an appropriate amount of vanadium source and surfactant in a mixed solution of isopropanol and diethylene glycol, followed by solvothermal reaction and calcination. This method offers high production efficiency, large production volume, fast preparation time, low cost, and excellent reproducibility, avoiding the problem of traditional sheet-like V2O5 agglomeration. Using coral-like V2O5 nanomaterials as the cathode material for magnesium batteries, its open three-dimensional porous structure not only increases ion attachment sites but also provides multiple pathways for electron transfer. Furthermore, the exposed (110) crystal planes reduce interfacial side reactions between the electrode and electrolyte surfaces, reduce the formation of passivation films on the electrode surface, thereby accelerating the redox reaction of the battery. It exhibits very high capacity storage and good rate performance, making it an excellent cathode material for magnesium batteries.

This invention proposes a lithium-ion battery electrolyte and its application. The electrolyte comprises at least the following components: a fluorinated solvent, including 2,2-difluoroethyl ethyl carbonate and fluoroethylene carbonate; a lithium salt, including a first lithium salt, wherein the first lithium salt comprises lithium hexafluorophosphate; and an additive, including a first additive, wherein the first additive comprises tripropynyl phosphate. The lithium-ion battery electrolyte and its application proposed in this invention can improve the high-voltage resistance of the electrolyte and enhance the cycle stability and rate performance of the battery.

The invention discloses a preparation method of a sulfide electrolyte film of an all-solid-state battery. The preparation method comprises the following steps: preparing interface modification slurry containing a fast ion conductor, a polymer elastomer and a photoinitiator, and preparing electrolyte functional slurry containing sulfide electrolyte and a crosslinkable binder; two layers of slurry are compositely coated on a substrate to form a composite wet film, the composite wet film is subjected to synchronous hot pressing and ultraviolet irradiation treatment, interface in-situ crosslinking and densification are achieved, and stripping rolling can be selectively carried out. Through key component matching and a synergistic process, the interface compatibility is effectively improved, the ion transmission impedance is reduced, lithium dendrite penetration is inhibited, and the prepared sulfide electrolyte film has high ionic conductivity, high compactness and excellent mechanical stability. After the thin film is applied to the all-solid-state battery, the cycling stability, the rate capability and the safety of the battery can be remarkably improved, and the preparation process is suitable for large-scale production and has important significance for promoting the industrialization of the all-solid-state battery.

The invention discloses a method for manufacturing positive electrode particles coated with ceramic particles and a glass-phase continuous layer by applying a wet-type one-time sintering process, which comprises the following steps of: mixing and grinding a lithium source, a glass-phase precursor, an LLZO precursor and a dispersion liquid in a mixer to form first precursor slurry, putting a nickel-cobalt-manganese precursor into the first precursor slurry, and fully stirring and mixing to form second precursor slurry; fully stirring and mixing the second precursor slurry, and drying to obtain precursor powder; carrying out aerobic sintering on the precursor powder, wherein the lithium source is firstly melted to react with each nickel cobalt manganese precursor and each LLZO precursor to respectively form a plurality of NCM (nickel cobalt lithium manganate) particles and a plurality of LLZO particles; the glass phase precursor forms a glass phase layer to coat the outer surface of each NCM particle, and the plurality of LLZO particles are distributed in each glass phase layer to integrally form the plurality of positive electrode particles.