48results about How to "Suppress flatulence" patented technology

The invention relates to shape-controllable nano lithium titanate composite and a preparation method thereof and a lithium ion battery. The preparation method includes (1) uniformly mixing a lithium source and a titanium source, sintering and cracking all mixtures to obtain a precursor of lithium titanate composite; (2) adding the precursor of lithium titanate composite into dispersion media that is then added with organic carbon source, grinding until particle size of the precursor of lithium titanate composite in all mixtures reaches the nano scale, and obtaining lithium titanate composite pulp; (3) drying, cracking and sintering the lithium titanate composite pulp to obtain the product. Through grinding the precursor of lithium titanate composite to the nano scale and adjusting the second sintering process, particle size of the product can be effectively controlled and particle shape can be so changed. In addition, with doping, carbon wrapping, and oxide wrapping, composite modification of the lithium titanate composite can be realized. Therefore, performance about capacity, magnification, cycling and so on of the lithium titanate is optimized.

The invention belongs to the technical field of a lithium ion battery, and particularly relates to an electrolyte applicable to a silicon carbon negative and a lithium ion battery comprising the electrolyte. The electrolyte comprises an electrolyte lithium salt, a non-aqueous organic solvent and an additive. Wherein the additive comprises a negative film formation additive, a fluorine-substitutedphenyl isocyanate compound additive with a formula I structure and a dosilane nitrogen-based compound additive. Compared with the prior art, the actual discharging capability, the cycle stability andthe high-temperature storage performance of a silicon carbon negative electrode lithium ion battery are effectively improved by means of a synergic effect generated by combined application of variousadditives, gas generation is prevented, the problems of volume expansion and pole plate pulverization of the battery during the charge-discharge process are solved very well, and meanwhile, the electrolyte is compatible with relatively good high- and low-temperature performance.

The invention discloses high-voltage lithium ion battery electrolyte, a preparation method and application of electrolyte. The high-voltage lithium ion battery electrolyte comprises an organic solvent, conductive lithium salt and a functional additive, wherein the organic solvent is prepared from a cyclic carbonate solvent, a fluoro solvent and a linear carbonic ester solvent, the content of the fluoro solvent in the high-voltage lithium ion battery electrolyte is 0.1-40wt.%, the content of the functional additive is 0.01-5wt.%, and the concentration of the conductive lithium salt in the organic solvent is 0.8-1.5mol/L. According to the high-voltage lithium ion battery electrolyte, the interfacial property of the anode and the cathode of the battery and the electrolyte can be improved, and the stability of the electrolyte can be improved, so that the cycle life of the high-voltage lithium ion battery is prolonged, the high-temperature property of the high-voltage lithium ion battery is improved and the working voltage of the high-voltage lithium ion battery is increased to be above 4.5V.

The present invention provides a non-aqueous electrolyte and a lithium ion battery containing the same, and belongs to the technical field of electrolyte research. The non-aqueous electrolyte comprises a non-aqueous organic solvent, a conductive lithium salt and an additive, the additive comprises based on the total weight of the electrolyte: 0.1-5% of an anode film formation additive, 0.1-10% ofa cathode film formation additive and 0.1-5% of a gas expansion inhibition additive, wherein the anode film formation additive comprises at least one of vinyl-vinylene carbonate, 4-Fluoro-1,3-dioxolan-2-one, Ethylene Sulfate, 1,3-propanesultone and vinylene carbonate; and the cathode film formation additive is at least one of nitriles, phosphate compounds and a boracic-like compound. The side reaction of the electrolyte and the electrode material in the storage and cyclic process of the battery is reduced, the battery gas expansion is inhibited so as to the storage and cycle lives of the battery are obviously improved.

The invention discloses a lithium ion battery electrolyte suitable for a NCM811 and SiO-C material system and a preparation method. In the electrolyte of the present invention, an organic solvent composed of ethyl methyl carbonate, diethyl carbonate, and ethylene carbonate, a lithium salt composed of lithium hexafluorophosphate and lithium difluorophosphate, and an additive composed of vinylene carbonate, fluoroethylene carbonate, ethylene sulfate, and 1,3-propane sultone are compounded in a certain proportion, and cooperate to react, during a lithium ion battery cycle, on the surface of NCM811 and SiO-C and form a stable solid electrolyte protective film to prevent direct contact between the electrolyte and NCM811 and SiO, thereby reducing the side reactions between the electrode and theelectrolyte, and reducing the phase transition and volume change of the material, and further improving the cycling performance of the lithium ion battery. Experimental results show that by using theelectrolyte of the present invention, the lithium ions of the NCM811 and SiO-C material system has a capacity retention rate of more than 90% after 500 cycles of 1C/1C at room temperature, and has excellent cycle performance.

The invention discloses a method for wrapping lithium cobalt oxide serving as an anode material of a lithium ion secondary battery through a wet method. According to the method for wrapping the lithium cobalt oxide serving as the anode material of the lithium ion secondary battery through the wet method, a soluble metal salt solution is added to the lithium cobalt oxide serving as the anode material, then stirring is conducted, the surface of the lithium cobalt oxide serving as the anode material is completely and evenly wrapped in a layer of corresponding metallic oxide after thermal treatment is conducted, in this way, the circulation performance of the lithium ion secondary battery at high voltage is effectively improved, and the expansion degree of the lithium ion secondary battery is reduced.

The invention relates to lithium secondary battery electrolyte and a lithium secondary battery thereof. The lithium secondary battery electrolyte comprises an organic solvent, conductive lithium salt,a benzonitrile compound and additives, the benzonitrile compound has a structure as shown in a formula I, and R is any one of F, substituted or unsubstituted C1-6 alkyl, substituted or unsubstitutedC6-26 aryl, C1-4 nitrile groups and C1-6 alkenyl. The benzonitrile compound as shown in the structural formula (I) is added into the electrolyte, transition metal ions can be combined, positive electrode material surfaces are improved, decomposition of the electrolyte is inhibited, bloating is further inhibited, and the high-temperature performance of the battery is improved. By adding the lithium-containing additives, the low-temperature performance of the battery can be improved, and the cycling performance of the battery can be remarkably improved.

The invention provides a method for improving the cycle performance of a battery, the method is applied to the battery, the battery comprises a positive plate, a negative plate and an isolating membrane arranged between the positive plate and the negative plate, the adhesive force between the isolating membrane and the positive plate or the negative plate is greater than or equal to 3N/m, and themethod comprises the following steps: in a first stage, separating the positive plate and the negative plate from each other; charging the battery with the first-stage current to a first-stage voltage; and in a second stage, charging the battery to a second-stage voltage with a second-stage current, the second-stage voltage being greater than the first-stage voltage, and the second-stage current being less than the first-stage current. The invention further provides an electronic device. According to the method provided by the invention, the cycle performance of the battery in a high-temperature environment can be remarkably improved.

A stock oil composition as a stock oil for production of needle coke or for production of an active carbon for electric double layer capacitor electrode, comprising a first heavy oil of 300 DEG C or higher initial boiling point, 12 mass percent or less asphaltene contents, 50 mass percent or more saturated contents and 0.3 mass percent or less sulfur contents as obtained by vacuum distillation ofpetroleums as residual oil and a second heavy oil of 150 DEG C or higher initial boiling point and 0.5 mass percent or less sulfur contents as obtained by fluid catalytic cracking of hydrocarbon oil.

The invention discloses non-aqueous electrolyte for inhibiting sodium-ion battery swelling as well as a preparation method and application thereof. The non-aqueous electrolyte comprises a sodium salt,an organic solvent and a first functional additive, wherein the molecular formula of the first functional additive is R1R2R3C3H3O3S; the content of the first functional additive in the non-aqueous electrolyte is 0.001-30wt%; the sodium salt refers to one or more of sodium hexafluorophosphate, sodium tetrafluoroborate, sodium hexafluoroarsenate, sodium borate dioxalate, sodium ditrifluoromethyl sulfonamide, sodium trifluoromethanesulfonate, sodium difluorosulfonimide or sodium perchlorate; the organic solvent refers to one or more of cyclic carbonate, chain linear carbonate, carboxylic ester or cyclic lactone.

The invention provides a positive electrode material of a lithium ion battery. The chemical formula of the positive electrode material is Li(1-a)NaaMnxFe(1-x)PO4(MeFy)b(C)c, wherein a is more than 0 and smaller than or equal to 0.08, b is more than 0 and smaller than 0.15, c is more than 0 and smaller than 1.5, b+c is smaller than 1.5, x is more than or equal to 0.1 and smaller than or equal to 0.9, MeFy is at least one of AlF3, TiF4, MgF2, ZrF4, MoF6 and NbF4; the positive electrode material is of a core-shell structure, and sequentially comprises a Na<+> bulk phase doped Li(1-a)NaaMnxFe(1-x)PO4 inner core layer, a middle transitional layer containing metal fluoride MeFy, and a carbon coverage layer positioned on the surface. The invention also provides a preparation method of the positive electrode material. According to the positive electrode material, the electric conductivity is improved, the bloating of the positive electrode material is effectively inhibited, the cycle life of the battery is prolonged, and the high-temperature storage property of the battery is improved.

A battery electrolyte A lithium ion battery containing the electrolyte is also disclosed, As that acid anhydride derivative additive is added into the battery electrolyte, At the same time, the acid anhydride derivative additive contains O, N, Si, F and has good compatibility with the positive and negative electrode materials when it is used as the electrolyte additive, which can effectively inhibit the gas expansion of the battery and improve the high-temperature cycling performance of the battery.

The invention discloses a novel compound additive for producing a high-strength carbon-graphite material and a preparation method of the carbon-graphite material. The novel compound additive is a mixture of rare-earth metal powder or a rare-earth compound and a boron compound, wherein the two substances are mixed at a mass ratio ranging from (1 to 1) to (1 to 5); the rare-earth compound is selected from one or more of a rare-earth organic compound and a rare-earth inorganic compound; the boron compound is selected from one or more of a boron organic compound and a boron inorganic compound.

The invention relates to a modified lithium titanate material. The modified lithium titanate material is prepared by mixing lithium titanate powder with fluorinated graphene and/or fluorinated graphite at mass ratio of 100-1 to 1-4. The modified lithium titanate material can be used as an electrode material in a lithium titanate battery or a lithium titanate capacitor. The modified lithium titanate material is capable of effectively restraining the swelling problem of the lithium titanate battery.

The invention discloses a novel composite additive for producing low-resistance high-strength graphite as well as a preparation method of the graphite material. The composite additive is a mixture of rare-earth metal powder or a rare-earth compound with titanium metal powder or a titanium compound, wherein the mass ratio of the two substances is (1:1)-(1:5) when the two substances are mixed; the rare-earth compound is selected from one or more of rare-earth organic compounds and rare-earth inorganic compounds; and the titanium compound is selected from one or more of titanium organic compounds and titanium inorganic compounds.