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

The invention discloses a preparation method of lamellar lithium manganese batteries, solving the technical problems of reducing the cost of lithium batteries, improving the high-temperature performance of the lithium batteries and simultaneously improving the energy density of the batteries. The preparation method of lamellar lithium manganese batteries comprises the following steps of preparing anode slurry, preparing cathode slurry, coating, baking, cutting and pressing to make a battery monomer. Compared with the prior art, the invention uses lamellar lithium manganese as anode active materials to make the battery monomer, and the lamellar lithium manganese is such a material that is rich in lithium and manganese, contains less nickel and no cobalt and has low cost; the lamellar lithium manganese batteries have visible reversible capacity at high voltage, is higher than 250 mAh/g when being charged to 4.8V, has the energy density higher than that of all the other anode materials, has excellent high-temperature performance and high energy density, and is suitable for various lithium ion batteries.

An active material for a high voltage negative electrode (>IV for Li) of a rechargeable lithium battery is disclosed. The chemical composition is represented by the general formula Li2+vTi3-wFexMyM'zO7-α, wherein M and M' are metal ions, and the radii of these ions are between 0.5 and 0.8, and form an octagonal structure with oxygen elements, for example, Ti3+ , Co2+, Co3+, Ni2+, Ni3+, Cu2+, Mg2+, Al3+, In3+, Sn4+, Sb3+, Sb5+, and the relationship between the oxidation number n and n' of α and M and M' is: 2α=-v+4w-3x -ny-n'z, and the value range is -0.5≤v≤0.5, 0≤w≤0.2, x>0, y+z>0, and x+y+z≤0.7. For all compositions, the structure correlates to that of orthorhosite. Negative active materials are prepared with a ceramic process, wherein lithium oxides, titanium oxides, iron oxides, M and/or M' oxides are used as starting materials for synthesis. Inorganic or organic solid precursors of these oxides may also be used. The mixture is baked after reaction diffusion. The resulting electrochemically active material provides low operating voltage, and capacity with good cycling capability at low and high current densities.

The invention which provides a preparation method of a wide potential window negative electrode material of a lithium ion battery belongs to the technical field of lithium ion batteries. The preparation method of the invention comprises the following steps: 1, mixing a lanthanum source, TiO2 with different crystal forms, and a lithium source, and grinding for 6-12h in a ball mill to obtain a mixture; and 2, putting the mixture in a muffle furnace, reacting for 12-24h at 800-950DEG C, and naturally cooling to room temperature to obtain the wide potential window negative material Li4La5-xLaxO12of the lithium ion battery, wherein x is 0.05 or 0.1. The negative electrode material prepared in the invention has a wide potential window, a good reversible capacity, an excellent rate performance and a stable cycle life, so the material which has a high practical use value allows practical requirements of various applications of the lithium ion battery to be effectively satisfied. In addition, the method of the invention has the characteristics of simplified preparation technology, high controllable reappearance, low production cost and the like.

The invention discloses a polypyrrole coated MoS2/C composite material and a preparation method thereof. The preparation method of the composite material comprises the following steps: 1), dissolving sodium molybdate dehydrate and thiourea in ethanol, then adding polyvinylpyrrolidone, uniformly performing stirring, then putting the mixture into a high-pressure kettle, and carrying out heat preservation reaction at the temperature of greater than or equal to 150 DEG C to obtain hollow nanospheres assembled by MoS2/C; and 2), uniformly mixing the hollow nanospheres assembled by MoS2/C with an oxidizing agent, taking the obtained mixture as a raw material, taking pyrrole as a coating source, taking a high-pressure kettle as a reaction chamber, and carrying out heat preservation reaction under a heating or non-heating condition under the condition that the mixture and pyrrole are not in contact with each other, thereby obtaining a polypyrrole coated MoS2/C composite material. The composite material is in a hollow spherical shape and has excellent Li<+> storage performance and reversible capacity, and the preparation method is simpler and more environmentally friendly.

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 preparation method of a spherical porous lithium-ion battery high-voltage cathode material and belongs to the technical field of lithium-ion batteries. The chemical formula of the material is LiNi0.5Mn1.5O4-Li3xLa(2/3)-xTiO3, wherein 0.05<x<0.15, and the mass fraction of the Li3xLa(2/3)-xTiO3 is 5%. The material is prepared by adopting an organic solvent assisted coprecipitation method. The preparation method is wide in raw material source, simple and convenient to operate, good in controllability and high in reproducibility, and the long-time high-energy-consumption high-temperature sintering process is avoided. The prepared material has the porous spherical characteristics, is small in granule, uniform in particle size distribution, high in crystallinity and better in rate performance, is of a P4332 structure and can be used as the high-performance lithium-ion battery high-voltage cathode material.

The invention discloses a preparation method of a titanate composite negative electrode material for a lithium ion battery. The preparation method comprises the following steps of dissolving a titanium source and a chromium source in an ethanol aqueous solution, adding citric acid under a stirring condition, adding the ethanol aqueous solution comprising a lithium source, performing water bath heating to form a gel state, performing drying and grinding, placing the product in a muffle furnace for pre-burning, and cooling to a room temperature to obtain a LiCrTiO<4-a<Cr2O3 precursor; dissolvingthe LiCrTiO<4-a<Cr2O3 precursor and FePO4 in absolute ethyl alcohol, performing uniform stirring and drying, cooling to the room temperature, placing the product in a ball-milling machine for ball-milling, performing sieving, placing the product in the muffle furnace for calcination, and cooling to the room temperature to obtain a LiCrTiO<4-a>Cr2O3-FePO4 electrode material; and dispersing the electrode material in an acetone solution, adding CNT, performing stirring, allowing a liquid to be completely volatilized to obtain the titanate composite negative electrode material for the lithium ionbattery. The preparation method has the advantages of wide raw materials, good controllability and high reproducibility and is simple and convenient to operate, the obtained material is relatively small in particle, uniform in grain size distribution and high in crystallinity, so that the material preparation cost is reduced, and the electrochemical performance of the material is improved.