24results about How to "Guaranteed cycle stability" patented technology

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

The invention relates to the technical field of batteries, in particular to a battery diaphragm, a preparation method thereof and a battery. The battery diaphragm comprises a base material layer and a dotted coating positioned on at least one side surface of the base material layer, the dotted coating comprises a non-fluorine composite material and a binding material; the non-fluorine composite material comprises aggregate of a plurality of unit materials, each unit material comprises a matrix and a coating layer located on the surface of the matrix, the matrix comprises a first polymer, and the coating layer comprises a second polymer; and the ratio eta of the thickness of the coating layer to the particle size of the unit material and the glass transition temperature Y of the second polymer meet the relational expression: Y = 100 eta-46. The battery diaphragm comprises the non-fluorine composite material and the binding material, the non-fluorine composite material is limited by satisfying the relationship, so that the adhesion difference between the diaphragm and an electrode plate at low temperature and high temperature is not large, and the whole performance of a battery cell is not greatly influenced after the battery cell preparation process is changed from hot pressing to cold pressing; and the cycling stability and the safety performance of the battery can be ensured.

The invention relates to an electrode material for lithium extraction, a preparation method of the electrode material, a lithium extraction electrode and a lithium extraction system, belongs to the field of salt lake lithium extraction, and solves at least one of the problems of fast capacity fading, relatively low overall lithium extraction efficiency and short service life of a lithium extraction electrode for an alkaline solution in the prior art. A preparation method of an electrode material for lithium extraction comprises the following steps: mixing an electrode active material with a rare earth salt solution, and forming a phosphate rare earth layer on the surface of the electrode active material in an in-situ coating manner; the electrode active material comprises lithium iron phosphate and a doped derivative thereof. When the preparation method, the obtained electrode material, the lithium extraction electrode and the lithium extraction system are applied to lithium extraction of salt lake brine, especially alkaline brine, at least one of the cycle performance, the lithium extraction efficiency and the service life is remarkably improved.

The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte, a preparation method thereof, an injection method and a lithium ion battery, the electrolyte comprises a first electrolyte for first injection and a second electrolyte for second injection, the first electrolyte comprises a first solvent, a first lithium salt and a first additive, the second electrolyte comprises a second solvent, a second lithium salt and a second additive, the first electrolyte comprises a first solvent, a first lithium salt and a first additive, the second electrolyte comprises a second solvent, a second lithium salt and a second additive, the mass percentage of the second electrolyte in the electrolyte is 5-20%, the first additive comprises dimethyl sulfide and vinylene carbonate, and the second additive comprises triphenyl phosphate and vinylene carbonate. According to the electrolyte, the first additive comprises dimethyl sulfide, and the second additive comprises triphenyl phosphite, so that the bad problems of high-temperature gas production and negative electrode interface black spots in the use process of a lithium-rich material lithium supplementing agent are solved.

The invention relates to the technical field of batteries, in particular to a negative pole piece, a preparation method thereof and a battery. The negative pole piece comprises a current collector; the first negative electrode coating is arranged on the surface of at least one side of the current collector in the thickness direction, the second negative electrode coating is arranged on the surface, far away from the current collector, of the first negative electrode coating, the second negative electrode coating comprises a layered multi-element metal oxide, and the layered multi-element metal oxide comprises at least two metal elements, the layered multi-element metal oxide meets at least one of the following characteristics: the capacity of the layered multi-element metal oxide is greater than or equal to 100mAh / g; the specific surface area of the layered multi-element metal oxide is greater than or equal to 100m < 2 > / g; the layered multi-element metal oxide has a porous structure; the interlayer spacing of the layered multi-element metal oxide is greater than or equal to 0.15 nm. The ion diffusion rate of the negative pole piece can be improved, rapid transmission of sodium ions on the surface of the negative pole piece is facilitated, and the cycle stability and the rapid charging performance of the battery are further improved.

The invention provides a secondary battery, a battery module and a device wherein the secondary battery comprises a positive pole piece, a negative pole piece and an electrolyte; the negative pole piece comprises a negative active material, the negative active material comprises a silicon material, and based on the mass of the negative active material, the mass fraction of the silicon material is X wt%; the electrolyte comprises an isocyanate additive, and based on the mass of the electrolyte, the mass fraction of the isocyanate additive is Y wt%; wherein-0.55 < = Y-0. 1X < = 0.25, 5 < = X < = 50, and 0.5 < = Y < = 5. According to the secondary battery, the stability of the SEI film can be improved, side reactions are reduced, and the cycle performance and the safety performance of the battery are improved.

This invention provides a battery activator and its preparation method, an activation film, a negative electrode, a battery, a battery pack, and an electrical device. The battery activator includes a shell and a slow-release material encapsulated within the shell. The slow-release material includes additives required for forming an SEI film. The shell includes a first polymer layer adjacent to the slow-release material and a second polymer layer away from the slow-release material. The first polymer layer includes a plurality of first micropores, and the second polymer layer includes a plurality of second micropores. The second polymer layer includes a cross-linked polymer formed by cross-linking C-C unsaturated polymers. The pore size of the first micropores is not greater than 0.2 μm, and the pore size of the second micropores is not less than 0.5 μm. The battery activator of this invention can continuously provide the additives required for forming an SEI film in the battery cell, thereby ensuring the capacity utilization and cycle stability of the battery cell.

The application belongs to the technical field of lithium batteries, and discloses a gel electrolyte taking a functionalized two-dimensional MXene material as a dispersant as well as a preparation method and application of the gel electrolyte. The gel electrolyte comprises a functionalized MXene material and a basic electrolyte; the functionalized MXene material is obtained by the following method: 1) treating a MAX phase material with a solution containing HCl and LiF, intercalating, peeling off, and then reacting with a diazonium salt solution to obtain a sulfonic acid functionalized MXene material. The application further discloses a preparation method of the gel electrolyte. The application reconstructs a lithium ion solvation structure, reduces a desolvation energy barrier, homogenizes a bulk phase electric field and ion flow, cooperatively induces formation of a stable SEI interface rich in inorganic species, significantly inhibits lithium dendrite growth, and improves interface kinetic stability. The method is simple and low in cost. The electrolyte is used in a lithium metal battery and exhibits excellent cycle performance.

The invention discloses a forming method of a magnesium oxide-based carbon dioxide adsorbent suitable for large-scale preparation. The forming method comprises the following steps: calcining a magnesium-containing precursor to prepare porous magnesium oxide raw powder; the preparation method comprises the following steps: carrying out impregnation modification on magnesium oxide raw powder and an alkali metal salt solution to obtain wet mixed thick slurry, drying the slurry, and carrying out secondary calcination to obtain modified adsorbent raw powder; and mixing the raw powder with deionized water, a forming aid and the like to prepare a plastic wet material, and performing extrusion-spheronization balling, drying and calcining to obtain regular spherical adsorbent particles. The formed adsorbent prepared through the method has the advantages of being controllable in particle size, high in mechanical strength, good in adsorptive property after being formed, excellent in cycling stability and the like, can be used for CO2 chemical adsorption trapping of CO2-containing gas under the medium-temperature condition, and is good in CO2 adsorptive property, economical efficiency of the technological method and environmental protection performance, the process technology is easy to amplify, and the method is suitable for industrial production. The method is suitable for industrial large-scale production.

The application provides a metal oxide supported active metal catalyst, a preparation method and application thereof. The metal oxide supported active metal catalyst comprises a metal oxide carrier and active metal particles supported on the metal oxide carrier; the loading amount of the active metal is 0.1wt%-5wt% based on 100% of the mass of the metal oxide carrier. It is tested that the hydrogenation reaction of carbonates to prepare formate by using the metal oxide supported active metal catalyst provided by the application as a hydrogen source or using gaseous carbon monoxide with different concentrations and water to provide in-situ hydrogen source for the water gas shift reaction realizes the hydrogenation reaction of carbonates to prepare formate, the yield of the obtained formate is high, the selectivity is above 99%, there is no attenuation after 6 cycles, and the metal oxide supported active metal catalyst has excellent bifunctional effect. In addition, the preparation method of the metal oxide supported active metal catalyst is simple, the operation condition is mild, and the cost is low, so that large-scale production can be realized.

The invention discloses a preparation method and application of an electrolytic water anode oxygen evolution catalyst. The method comprises the following steps: dissolving a nickel salt, a molybdenum salt and a sulfur source in water, and adjusting the pH value to be acidic to obtain an electrodeposition electrolyte; a three-electrode system composed of a conductive substrate, a counter electrode and a reference electrode is inserted into the electro-deposition electrolyte and electrified, and the electrolytic water anode oxygen evolution catalyst is electro-deposited on the conductive substrate. The catalyst prepared by the preparation method disclosed by the invention has rich nano structures and electronic effects, and can show relatively high intrinsic catalytic activity; and meanwhile, the catalyst is tightly combined with the conductive substrate, so that the cycling stability of the material in alkaline electrolyte is further ensured. The water electrolysis oxygen evolution reaction catalyst prepared by the one-time electrodeposition method has the advantages of simple process, easiness in scale production, no need of additional addition of a binder, direct in-situ growth on a conductive substrate, and improvement of the binding force of the catalyst and the substrate, so that the charge transfer efficiency and the structural stability are improved, and the method has a good application prospect in water electrolysis anode oxygen evolution.

This invention discloses an integrated device for purifying impurities in electrolytically produced gases and enriching carbon dioxide based on pressure swing adsorption (PSA), belonging to the field of gas separation and new energy utilization technology. The device includes a water electrolysis unit, a PSA unit, and a control unit. The water electrolysis unit uses renewable energy to electrolyze water to produce crude hydrogen. The PSA unit comprises at least two sets of adsorption towers connected in parallel, filled with a composite adsorbent that selectively adsorbs oxygen and carbon dioxide. The control unit uses time-series control to alternately operate the adsorption towers between a "purification mode" and an "enrichment and regeneration mode." In purification mode, the adsorption towers remove oxygen impurities from the crude hydrogen; in enrichment and regeneration mode, the adsorption towers adsorb carbon dioxide from an external gas source and output enriched gas through vacuum desorption. This invention achieves high integration and low energy consumption by time-sharing reuse of the same set of adsorption towers, making it particularly suitable for preparing raw material gas for hydrogen autotrophic microorganisms to synthesize single-cell proteins (air proteins).

The invention provides a method for preparing a sodium-ion battery hard carbon negative electrode with a high cross-linked structure based on cooperative cross-linking of hydroxyl enriched lignin and oxidized asphalt, and belongs to the technical field of preparation of sodium-ion battery negative electrode materials. The high-performance hard carbon negative electrode can be prepared without a solvent and an additional additive by optimizing a lignin pretreatment process and an asphalt pre-oxidation process and improving an asphalt-lignin cross-linking mode; by adopting the biomass derivative and petroleum asphalt composite carbon source, the method has the advantages of low cost, environmental protection and accessible raw materials; the sodium ion battery with the obtained hard carbon negative electrode has excellent electrochemical performance and is suitable for large-scale production of the sodium ion battery; and the practicability is high.

The invention provides a method for preparing a Prussian blue positive electrode material through carbon coating, aiming at the problem that Prussian blue is difficult to be subjected to high-temperature carbon coating, a Prussian blue pyrolysis intermediate is adopted as a raw material, and carbon-coated Prussian blue is synthesized in situ. In addition, along with the rise of the heat treatment temperature, the higher the graphitization degree of the carbon is, and the better the conductivity of the carbon-coated Prussian blue is. When the temperature exceeds 600 DEG C, Fe2 [Fe (CN) 6] is decomposed into Fe and FexC, so that Prussian blue cannot be synthesized.

The application relates to the technical field of high ignition point insulating oil, and particularly discloses a metal-supported catalyst and application of the metal-supported catalyst in high ignition point insulating oil. The metal-supported catalyst comprises a carrier, an active metal supported on the carrier and a composite metal oxide mesoporous layer, the carrier is a metal oxide and is at least one selected from MoO2, Al2O3, ZrO2, MgO, TiO2 and SnO2; the active metal is a transition metal and is at least one selected from Fe, Co, Cu, Ni, Ti, Zr, Mn, V and Zn; and raw materials of the composite metal oxide mesoporous layer comprise SiO2, ZrO2 and a carbon precursor. The metal-supported catalyst can be used for synthesizing ester insulating oil, can produce high-efficiency catalysis on synthesis of the ester insulating oil with a small amount, has high cycle stability and can keep excellent catalytic efficiency after multiple cycles.

The invention discloses a method for improving ammonium storage performance of MoO3 through surface engineering. The preparation method comprises the following steps: firstly, growing MoO3 on a carbon cloth substrate by adopting a hydrothermal method; then phosphating the MoO3 to obtain MoO3-P, introducing a P-O bond, and enabling the MoO3 to generate a large number of O vacancies at the same time; and further soaking the MoO3-P in an ammonium sulfate solution to obtain a final product. In a three-electrode electrochemical system formed by the ammonium sulfate electrolyte, the electrochemical performance evaluation on the obtained sample shows that the specific capacity of the sample is up to 260.7 mAh g <-1 > under the current density of 10 mA cm <-2 >, and the capacity value is kept at 98.87% after 2100 charge-discharge cycles.

The invention discloses a positive electrode active material and a preparation method thereof, a positive electrode and a battery. The 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 monocrystal-like lithium manganate and a coating layer coating the surface of the monocrystal-like lithium manganate, the second positive electrode active material comprises secondary spherical lithium manganate and a coating layer coating the surface of the secondary spherical lithium manganate, and the coating layer comprises an MXene material and a metal oxide. The composite coating layers are respectively formed on the surfaces of the monocrystal-like lithium manganate and the secondary spherical lithium manganate, so that the lithium manganate material can be effectively prevented from particle breakage in the rolling and charging and discharging processes, and the cycle performance and the rate capability of the battery are effectively improved while the compaction density of the positive electrode is improved.

The present application relates to the technical field of lithium metal battery, especially to an electrolyte for lithium metal / lithium iron phosphate battery system and a lithium metal / lithium iron phosphate battery. The electrolyte for lithium metal / lithium iron phosphate battery system comprises lithium salt, solvent and additive; the additive comprises 1,4-butylenesulfone and fluoroethylene carbonate, and the solvent comprises ether solvent. The electrolyte for lithium metal / lithium iron phosphate battery system has good compatibility with lithium metal, can form a stable solid-state electrolyte interface film on the surface of lithium metal negative electrode, and the addition of 1,4-butylenesulfone and fluoroethylene carbonate can improve the stability and ionic conductivity of the electrolyte film, thereby ensuring the coulomb efficiency and cycle stability of the battery.

The invention relates to the field of new energy batteries, in particular to a lithium ion battery which comprises a positive pole piece, a negative pole piece and electrolyte, the positive pole piece comprises a positive active material; wherein the positive electrode active material comprises lithium iron phosphate particles and a coating layer coating the surfaces of the lithium iron phosphate particles; the coating layer contains a high-nickel material, the high-nickel material comprises LiNi < x > Co < y > Mn < z > O < 2 >, x + y + z = 1, x is greater than or equal to 0.80 and less than or equal to 0.95, and 0.0 lt; yt; Yt; 0.20, 0.0 < lt >; zlt, zlt; 0.20, 0.20; the electrolyte comprises a positive electrode film-forming additive, and the positive electrode film-forming additive comprises an organic boron additive. The lithium ion battery provided by the invention has good electrochemical performance.

The application belongs to the technical field of aqueous zinc ion batteries, and discloses a low-temperature-resistant aqueous zinc ion battery and a preparation method thereof. The low-temperature-resistant aqueous zinc ion battery is constructed by using a single or composite positive electrode material with excellent zinc ion storage performance and ion diffusion dynamics, and using a composite aqueous solution system with various cations and anions combined and regulated as an electrolyte, and cooperating with zinc metal as a negative electrode. The low-temperature-resistant aqueous zinc ion battery is a low-temperature button type, soft package or cylindrical zinc ion battery. The application designs and regulates the interaction and hydrogen bond network distribution of various salt solutes and pure water solvents of the low-temperature-resistant electrolyte, matches the zinc storage positive electrode material with good ion dynamics in a low-temperature environment, and constructs the zinc ion battery with stable working capacity and high specific capacity at an extremely low temperature (‑80℃), which is applied as an energy supply device in various extreme environments.

The present application relates to a resin-assisted gradient-doped LMFP positive electrode material, a preparation method and a positive electrode, the preparation method comprising: mixing a sulfonic acid type cation exchange resin with a mixed salt solution, loading metal ions on the sulfonic acid type cation exchange resin, washing to obtain a loaded resin; heat treating the loaded resin to uniformly disperse metal oxides, and then mixing with a phosphoric acid solution to obtain a mixed solution; the mixed solution is dried by spray drying to obtain a precursor powder; mixing a lithium source, a nitrogen-doped carbon source and the precursor powder, and wetting with a glucose solution to form a slurry mixture; after the slurry mixture is dried, sintering is performed to obtain the resin-assisted gradient-doped LMFP positive electrode material. The present application can inhibit the Jahn-Teller distortion of Mn, and improve the cycle stability and conductivity of the positive electrode material.

The invention discloses a quasi-solid sodium electroelectrolyte and a preparation method and application thereof, and belongs to the technical field of sodium metal batteries. The quasi-solid sodium electric electrolyte provided by the invention comprises a light curing agent, a sodium ion electrolyte and a two-dimensional material, the two-dimensional material comprises one or more of fluorinated graphene, titanium nitride, boron nitride, silicon disulfide, tungsten disulfide and silicon carbide. The quasi-solid-state sodium electric electrolyte provided by the invention has good mechanical strength and mechanical stability, the resistance of the quasi-solid-state sodium electric electrolyte can be reduced, and the ionic conductivity is improved; when the quasi-solid sodium electroelectrolyte is applied to a sodium metal battery, the sodium metal battery has relatively high specific capacity under both low multiplying power and high multiplying power, and long-time cycling stability can be maintained.

The invention discloses a composite diaphragm as well as a preparation method and application thereof, and relates to the field of flow batteries. The composite diaphragm comprises a basement membrane and a modified coating located on one side or two opposite sides of the basement membrane, the basement membrane comprises a middle layer and a transition layer which are integrally formed, the basement membrane is made of polymer resin, and the transition layer is formed by permeating components of the modified coating into the basement membrane; the modified coating comprises a filler and a binder, and the filler is at least one of a carbon material, a metal oxide and a mesoporous material. According to the composite diaphragm, the surface structure is reconstructed through the modified coating, the average pore size of the surface layer is reduced, when the composite diaphragm is applied to charge and discharge of the flow battery, the shuttle of active substances in an electrolyte can be blocked, the ion selective permeability is improved, the coulombic efficiency and the specific discharge capacity of the flow battery are remarkably improved, and the flow battery has excellent cycle stability.

This invention relates to the field of vanadium redox flow battery technology and discloses a method for preparing a solid-liquid hybrid vanadium redox flow battery electrolyte. The method includes adding demineralized water, concentrated sulfuric acid, industrial-grade V₂O₅, and oxalic acid as a reducing agent to a reaction vessel to obtain a 3.5-valent vanadium ion liquid electrolyte; stirring the main material vanadium-based oxide, a porous solid carrier, and auxiliary materials conductive agents and binders to obtain a micron-sized vanadium-based slurry; granulating and sintering the micron-sized vanadium-based slurry to obtain a vanadium-based solid porous material; and assembling the vanadium-based solid porous material and the 3.5-valent vanadium ion liquid electrolyte into a separate solid-liquid reactor to obtain the solid-liquid hybrid vanadium redox flow battery electrolyte. This invention, by combining a solid-phase energy storage active material with a 3.5-valent vanadium ion liquid electrolyte, increases the total charge capacity of the vanadium redox flow battery and improves its volumetric energy density without increasing the volume and concentration of the 3.5-valent vanadium ion liquid electrolyte.