33results about How to "Considerable reversible capacity" patented technology

An active material for high-voltage negative electrodes (>1V vs. Li) of secondary rechargeable lithium batteries is disclosed. Chemical composition is represented by the general formula Li2+vTi3−WFeXMyM′ZO7−α, where M and M′ are metal ions having an ionic radius between 0.5 and 0.8 A and forming an octahedral structure with oxygen, like Ti3+, Co2+, Co3+, Ni2+, Ni3+, Cu2+, Mg2+, Al3+, In3+, Sn4+, Sb3+, Sb5+, α is related to the formal oxidation numbers n and n′ of M and M′ by the relation 2α=v+4w−3x−ny−n′z and the ranges of values are −0.5≰V≰0.5, 0≰w≰0.2, x>0, y+z>0 and x+y+z≰0.7. The structure is related to that of ramsdellite for all the compositions. The negative active material is prepared by ceramics process wherein lithium oxide, titanium oxide, iron oxide, M and / or M′ oxide are used as starting material for synthesis. Inorganic or organic solid precursors of the oxides can also be used instead. After reactant dispersion the mixture is fired. The resulting electrochemically active material provides low working voltage and capacity with excellent cycling capabilities at both low and high current densities.

The invention discloses a preparation method of a multilevel structure titanate negative electrode material for a lithium ion battery, and belongs to the technical field of lithium ion batteries. Themethod concretely comprises the following steps: dispersing a sodium source and a titanium source in a glycol and anhydrous ethanol mixed solution to form a solution A; dissolving a barium source in an aqueous solution of anhydrous ethanol to form a solution B; mixing and stirring the solution A and the solution B, heating the obtained solution until evaporative drying is achieved, placing the obtained precursor in a muffle furnace, and carrying out pre-calcining, ball milling and calcining to obtain a BaNa2Ti6O14 material; dispersing the material in an acetone solution, adding carbon nano-tubes, and stirring and heating the obtained solution until the solution is completely volatilized in order to obtain BaNa2Ti6O14-CNT; and carrying out mixing and ball-milling on the BaNa2Ti6O14-CNT andcarbon fibers, and sintering the obtained mixture in nitrogen to obtain the target product. The titanate negative electrode material obtained in the invention has a stable multilevel composite structure, so the titanate negative electrode material has the advantages of considerable wide potential window reversible capacity, excellent rate performances and stable cycle life.

The invention discloses a lithium nickel cobalt manganese oxide sosoloid material and a preparation method thereof, and application of the lithium nickel cobalt manganese oxide sosoloid material serving as a cathode material of a high-rate and high-capacity secondary battery and a super capacitor. The chemical formula of the material is Li1+sigmaNixCoyMn1-x-yO2, wherein sigma is more than 0.0 and less than or equal to 12, x is more than 0.0 and less than or equal to 0.6, y is more than or equal to 0 and less than 0.5, and 1-x-y is more than 0.0 and less than or equal to 0.5. The invention also discloses a preparation method for the material. The method comprises the following steps of: preparing a precursor by a coprecipitation method; and obtaining the material by two-step solid phase sintering. The invention also discloses the material serving as the cathode material and application of the current lithium ion battery in compatibility with a mixed super capacitor. Compared with the prior art, the lithium nickel cobalt manganese oxide sosoloid material has the advantages that high-rate and high-capacity high charging and discharging cyclic performance is realized, and industrialization is easy to implement; discharging is executed by 1.6A / g(10C) current; a complete charging and discharging cycle is executed for more than 60 times within 2.5 to 4.3V; and the final discharging is 120mAh / g higher than the capacity. The material obtained by the invention can be used in the conventional lithium ion battery market and can be used for power supplies of an electric tool, an electric automobile and an intelligent power grid.

The invention provides a broad potential window negative electrode material. The material has a chemical formula: aLi4Ti5O12-bLi3xLa(2 / 3)-xTiO3 (3%<=b:a<=15%, 0.05<=x<=0.15). The negative electrode material has the advantages of uniform particles, good dispersibility, and high crystallization degree. Materials in different morphologies and particle sizes can be obtained through adjusting the organic solvent species, reaction temperature, and reaction time.

The invention discloses a preparation method of a lithium ion battery composite anode material and belongs to the technical field of lithium ion batteries. The molecular formula of the lithium ion battery composite anode material is BaNa2Ti6O14-aLi3xLa2 / 3-xTiO3(LLTO), wherein a is more than or equal to 0.1 and less than or equal to 0.4, and x is more than or equal to 0.05 and less than or equal to 0.15. The preparation method comprises the following concrete steps: putting a barium source, a sodium source and a titanium source into a ball milling tank, carrying out ball milling, then putting into a muffle furnace for pre-sintering, cooling, carrying out ball milling in a ball milling machine, sieving, then putting into the muffle furnace for roasting, cooling, and carrying out ball milling, so that an anode material precursor is obtained; and dissolving a lithium source, a lanthanum source, a titanium source and the anode material precursor into an organic solvent, stirring, then transferring into a closed reaction kettle, carrying out heat preservation, cooling, carrying out suction filtration, drying, and putting the obtained mixture into the muffle furnace to be roasted, so that the BaNa2Ti6O14-aLi3xLa2 / 3-xTiO3(LLTO) composite anode material is obtained. The preparation method disclosed by the invention has the advantages that raw material sources are wide, the operation is simple, the controllability is good, the reproducibility is high, and the obtained material is smaller in particle, uniform in particle size distribution and high in degree of crystallinity, so that preparation cost of the material is reduced and the electrochemical performance of the material is also improved.

The invention discloses a preparation method of a spherical N-doped C-coated metal oxide negative electrode material with a multi-stage structure and belongs to the field of lithium ion batteries. Thepreparation method comprises the following specific steps: mixing and stirring N-methylpyrrolidone, polyvinylidene fluoride and guanidine hydrochloride to transparent gel, drying to remove a solventand calcining in argon to obtain N-doped C; dissolving sodium molybdate, nickel nitrate, ammonium fluoride and urea in an alcohol solution, stirring into a homogeneous solution and performing hydrothermal reaction; then mixing the N-doped C and the homogeneous solution, ball-milling and calcining to obtain a NiO / NiMoO4@N-C material; putting the NiO / NiMoO4@N-C material in distilled water and addingsodium dodecyl sulfate after ultrasonic treatment; adding pyrrole and hydrochloric acid, stirring, then adding an initiating agent, centrifuging, washing and drying to obtain. The negative electrodematerial synthesized by the preparation method disclosed by the invention is uniform and consistent in particle, good in dispersibility and high in degree of crystallinity and has the stable multi-stage composite structure, thereby having appreciable wide potential window reversible capacity, excellent rate capability and stable cycle life.

The invention discloses a preparation method of a sodium barium titanate composite negative material for a lithium ion battery, which belongs to the technical field of a lithium ion battery. The method comprises the following steps: dissolving sodium nitrate and barium nitrate into an alcohol aqueous solution, adding organic acid, and marking as a solution A; dissolving TiCl4 in the alcohol solution, and marking as a solution B; mixing the solution A and the solution B, stirring, and evaporating the liquid; then pre-burning in a muffle furnace, sintering, cooling to room temperature, ball milling to obtain a BaNa2Ti6O14 material; placing the BaNa2Ti6O14 material into a beaker, adding a surfactant and deionized water, ultrasonically dispersing, and then stirring; and then adding pyrrole andacid solution, adding oxidant, stirring in an icy water bath, washing, and obtaining the BaNa2Ti6O14@PPy composite negative material. The negative material is uniform in particle size, stable and compact in structure, remarkable in wide potential window reversibility, excellent in rate capacity and stable in cycling life.

The invention relates to a network-like graphene nanometer material as well as a preparation method and application thereof. The preparation method of the network-like graphene nanometer material comprises the following steps: 1) calcining a carbon source organic matter at the temperature of 500-1000 DEG C so as to obtain a calcined matter; 2) adding water into the calcined matter for washing, and filtering so as to obtain filter residues; and 3) annealing the filter residues at the temperature of 200-1600 DEG C in a protective atmosphere, thereby obtaining the product. According to the network-like graphene nanometer material disclosed by the invention, the carbon source organic matter serves as a raw material, and the nanometer material is prepared through calcining, washing and secondary high-temperature annealing, an extra template and a template dissolving process are not involved, the process flow is simple, the equipment requirement is low, and industrial production is easily realized. Moreover, the network-like graphene nanometer material has wide interlayer spacing and excellent conductivity and presents excellent sodium storage performance.

The invention discloses a preparation method of a lithium sodium titanate negative electrode material with a multistage structure, and belongs to the technical field of lithium ion batteries. The method comprises the following specific steps: dissolving tetrabutyl titanate, lithium acetate and sodium nitrate in an alcohol solution, adding citric acid to serve as a chelating agent, then adding an amine compound, stirring to form gel, and performing vacuum drying; then mixing gamma-LiAlO2 with the dried gel, performing ball milling, performing preheating treatment in the air, then performing ball milling and calcining to obtain a Na2Li2Ti6O14@gamma-LiAlO2 material; putting the Na2Li2Ti6O14@gamma-LiAlO2 material into distilled water, performing ultrasonic treatment and adding sodium dodecyl benzene sulfonate; and pouring a dissolved pyrrole solution into the mixture, stirring, adding an initiator, centrifuging, washing and drying to obtain a target product. The synthesized negative electrode material has the advantages of uniform and consistent particles, high dispersity and high degree of crystallinity; with a stable multistage composite structure, the negative electrode material hasconsiderable wide-potential-window reversible capacity, high rate performance and stable cycle life.

The invention discloses a core-shell type composite negative electrode material, a preparation method and applications thereof, the composite negative electrode material comprises an inner core formedby a first active substance and a second active substance, and a carbon coating layer shell used as a third active substance, the first active substance is a sheet-shaped silicon-based material, andthe second active substance is a silicon-based material. The second active substance is a flake graphite material, and the third active substance is a carbon-coated shell. The composite material disclosed by the invention is used for the negative electrode of the lithium ion battery, and has high specific capacity (the capacity is greater than 400mAh / g) and excellent cycle life. The method is simple in process and easy for large-scale production.

The invention relates to a lithium ion battery and a preparation method thereof. The lithium ion battery comprises a positive pole, a negative pole and electrolyte, wherein the electrolyte comprises lithium salt and a solvent; an active material of the positive pole is a rich lithium manganese base solid solution; an active material of the negative pole is lithium titanate; and the solvent comprises additives of one or more selected from fluoro carbonic ester, fluoro methyl sulfolane or derivatives of the fluoro methyl sulfolane, fluoro methyl sulphurous acid vinyl ester or derivatives of the luoro methyl sulphurous acid vinyl ester, and fluoro methyl sulfuric acid vinyl ester or derivatives of the fluoro methyl sulfuric acid vinyl ester. The preparation method comprises the following steps of: preparing a positive pole piece; preparing a negative pole piece; coiling or overlapping the obtained positive and negative pole pieces and a diaphragm so as to prepare a battery cell; putting into a shell or wrapping by a membrane; drying; injecting the electrolyte and sealing an opening; standing and forming; and subsequently aging, degassing, sealing, capacity dividing and detecting so as to obtain the lithium ion battery. The battery has the characteristics of high energy density, high security, low cost and long service life.

The invention discloses a method for preparing a double metal oxide negative electrode composite material with a multi-stage structure, and belongs to the technical field of lithium ion batteries. Themethod includes the following specific steps of dissolving nickel nitrate, cobalt nitrate, ammonium salt and amide into water, stirring, moving into a polytetrafluoroethylene reactor and adding appropriate amount of foam metal, reacting for 10-15 hours, cooling and drying, and then transferring to a tube furnace and carrying out heat treatment in an N2 atmosphere for 1-5 hours to obtain NiCoO2-Co3O4 grown on the foam metal, placing the NiCoO2-Co3O4 in a small beaker, adding an aqueous solution of a surfactant, ultrasonic processing, stirring, successively adding pyrrole, an acid solution andan oxidizing agent, washing after stirring in an ice water bath and drying to obtain a target product. The Co and Ni double metal oxide negative electrode composite material prepared by the method hasa uniform particle size, a stable and compact structure, considerable wide potential window reversible capacity, excellent rate performance and stable cycle life.

The invention provides a modified N, P co-doped lithium titanate negative electrode material and a preparation method thereof, and specifically relates to the technical field of lithium ion battery negative electrode materials. 2 O and anatase are mixed to obtain a precursor. Put the precursor and anhydrous sodium hypophosphite in a tube furnace and feed NH 3 and N 2 The mixed gas is heated to 800°C to obtain a nitrogen and phosphorus co-doped lithium titanate material. Add petroleum pitch, inorganic substances, organic solvents, and nitrogen-phosphorus co-doped lithium titanate particles into a 100 mL round-bottomed flask, mix well, and remove the organic solvent by rotary evaporation. The mixture after removing the organic solvent was moved into a tube furnace, and passed through H 2 Mix gas with Ar and raise the temperature to 800-850°C and keep the temperature constant for 1h, then cool down to 400°C and keep the temperature for 1h. After cooling down to room temperature, use 1 mol / L hydrochloric acid to remove the inorganic substances in the mixture, centrifuge and wash, and then vacuum-dry for 12 hours to obtain the product. The invention can ensure uniform and dense dispersion of the entire composite material, thereby maintaining the stability and high conductivity of the electrode structure.

The invention belongs to the field of aqueous solution zinc-based batteries, and more specifically relates to an aqueous solution-based zinc-based battery cathode material, its preparation and application. The active material is elemental iodine, chalcogenide elements or compounds formed by chalcogenide elements; the conductive material is conductive and has a porous structure; wherein the conductive material not only plays a conductive role, but also utilizes its porous structure It can absorb or coat the active material, and prevent the active material from being dissolved and invalidated. It is used as a positive electrode material for zinc-based batteries based on aqueous solutions, especially as a positive electrode material for rechargeable aqueous zinc-based batteries, with high reversible capacity, energy density and cycle stability.