48results about How to "Suppress flatulence" patented technology

The invention discloses a high-voltage electrolyte and a lithium ion battery. The high-voltage electrolyte comprises a non-aqueous organic solvent, an electrolyte salt, a conventional high-voltage electrolyte additive and a functional additive. The functional additive has a general chemical formula of AXB or AB. The electrolyte functional additive is added into the conventional high-voltage electrolyte additive so that the high-voltage electrolyte is prepared. The lithium ion battery containing the high-voltage electrolyte comprises a positive pole and a negative pole. In the lithium ion battery, the additives in the high-voltage electrolyte can produce synergism, can form interfacial films on surfaces of the positive and negative poles, can inhibit electrode surface reaction activity, can reduces electrolyte oxidation decomposition and can effectively inhibit Qi distention so that lithium ion battery high temperature performances, cycle performances at a normal temperature under normal pressure, and a service life are improved and lithium separation in the lithium ion battery working at a low temperature is reduced.

The invention discloses electrolyte, a preparation method for the same and a high-voltage lithium ion battery. The electrolyte mainly comprises an organic solvent, conductive lithium salt and an additive, wherein the organic solvent is prepared from more than one of a cyclic carbonate solvent, an aromatic hydrocarbon solvent and a linear solvent; the concentration of the conductive lithium salt in the organic solvent is 0.8 to 1.5mol / L; the using amount of the additive is 0.1 to 10.0 percent based on the weight of the organic solvent, and the additive is a halogenated cyanophenyl compound. After the additive is added into the electrolyte, a polymer film can be formed on the surface of each of a positive electrode and a negative electrode, so that the interface impedance of the electrodes / electrolyte is reduced, the decomposition of the electrolyte on the surface of an electrode material is suppressed, and the prolonging of cycle life of the high-voltage lithium ion battery (higher than 4.4V), the improvement of high / low-temperature performance of the high-voltage lithium ion battery and the suppression of gas expansion of the battery are facilitated.

The invention relates to non-aqueous electrolyte. The non-aqueous electrolyte comprises lithium salt, solvent and additives, wherein the additives include an additive A and an additive B, the mass percent of the additive A in the electrolyte is 0.01 to 10 percent, the mass percent of the additive B in the electrolyte is 0.01 to 10 percent, the structural formula of the additive A is as follows (which is specified in the description), R1, R2 and R3 are respectively an alkyl group of C1 to C3, and R4 is a linear-chain or branch-chain alkyl group of C1 to C5; the chemical formula of the additive B is CH3O(CH2CH2O)mCH3, and m is an integer of 1 to 6. By improving the non-aqueous electrolyte, the electrolyte can remarkably inhibit the inflation problem of the lithium titanate battery, so that the battery adopting the lithium titanate as a negative electrode has good cyclicity and magnification charging-discharging property.

The invention relates to an electrolyte. The electrolyte comprises lithium salt, nonaqueous solvent and an additive; the additive is cycloalkene represented in the general formula (I) or the general formula (II), wherein R1 represents one of an alkyl phosphate group, a fluorinated phosphate group and a phosphazene group, R2 represents an alkyl group with the carbon number of 1-12, or an alkoxy carbanyl group with the carbon number of 1-12, or an alkyl sulfonyl group with the carbon number of 1-12 or an alkenyl group with the carbon number of 1-12, and all hydrogen atoms in the R2 substituent group are replaced by halogen atoms. When the electrolyte is used for manufacturing a lithium ion battery, stable interface films can be formed on the surfaces of the positive electrode and the negative electrode, so that reaction activity of the surfaces of the electrodes is restrained, oxygenolysis of the electrolyte is reduced, gas expansion is effectively restrained, then the safety performance and the cycling performance under high voltage particularly the high-temperature cycling performance of the lithium ion battery are improved, and the service life of the lithium ion battery is prolonged.

The invention discloses an encapsulating method and device of a lithium ion battery. The method and device realize heating encapsulating of a lithium ion battery and then fast cooling. The device comprises a heat encapsulating unit, a transmission structure and a cold encapsulating unit. The heat sealing unit heats and encapsulates a cell, and the treated cell is conveyed into the cold encapsulating unit through the transmission structure and then is cooled and encapsulated. The encapsulating method and device shorten the adjustment time from heat encapsulating to cold encapsulating, preventswaste of resources and time and improves the production efficiency. The method and device can effectively suppress the flatulence of the lithium ion battery, prolong the storage time of the battery, and greatly improve the cycle life and safety of the lithium ion battery.

The invention discloses a lithium titanate-titanium dioxide composite material formed in situ and a preparation method thereof. The lithium titanate-titanium dioxide composite material is composed of three layers from interior to exterior, wherein the innermost layer is lithium titanate; the middle layer is titanium dioxide; and the outermost layer is carbon. The preparation method comprises the following steps: adding titanium dioxide into an aqueous solution of sodium hydroxide and carrying out a hydrothermal reaction; then adding a product of the previous step into an acid solution, carrying out ion substitution, then carrying out centrifugation to obtain a solid, adding the solid into a lithium hydroxide solution, then carrying out uniform mixing and adding the obtained mixture into a hydro-thermal reaction vessel for a reaction; and carrying out centrifugation again, subjecting a collected solid to primary roasting so as to obtain lithium titanate, adding an organic carbon source, and carrying out ball milling and secondary roasting successively so as to obtain the lithium titanate-titanium dioxide composite material formed in situ. The lithium titanate-titanium dioxide composite material has a core-shell structure, can inhibit bloating of a product and enables the product to have good safety performance and structural stability.

The invention discloses a preparation method of aluminum-oxide-coated nano lithium titanate composite material, which comprises the steps of: adding aluminum salt solution into prepared Li4Ti5O12 suspending liquid under the stirring condition, wherein the adding quantity of the aluminum salt solution is in accordance with the molar ratio as follows: Ti: Al=5: x, and x=0.01-0.55; simultaneously, adding a right amount of ammonia water, and adjusting the pH value to be 8-10; stirring for reaction for 30-50 minutes, and standing still for about 6 hours; after filtering, washing and drying, obtaining precursor of the aluminum-oxide-coated nano lithium titanate composite material; and finally, sintering the obtained precursor of the aluminum-oxide-coated nano lithium titanate composite materialat 400-600 DEG C for 4-10 hours, naturally cooling to be room temperature, and obtaining the aluminum-oxide-coated nano lithium titanate composite material.

The invention discloses a preparation method for a nickel lithium manganate coated composite material. The preparation method comprises the following steps of adding a composite solution of a calcium salt, a zircon salt and a titanium salt into a pure-phase nickel lithium manganate precursor suspension liquid, simultaneously adding polyethylene glycol (PEG) as a dispersing agent and citric acid as a complexing agent, adjusting pH with ammonia water, carrying out mechanical stirring and constant-temperature waterbath reaction, taking out and ageing the composite solution, and carrying out filtering, washing and drying to obtain a Cao-ZrO2-TiO2 coated nickel lithium manganate precursor, wherein the composite solution is prepared from Li, Ca, Zr and Ti according to the ratio of 2:x:x:x, and x is equal to (0.01-0.1); and carrying out calcination and annealing processing in an air atmosphere to obtain the CaO-ZrO2-TiO2 coated nickel lithium manganate composite material. The material obtained according to the preparation method is pure in phase, well crystallization is achieved, the process is simple, continuous industrial production is easily realized, moreover, the initial discharging specific capacity at 0.2C reaches over 130mAh / g, and the cycle capacity retention rate at 0.2C after rate of 100 times is over 97%.

The invention belongs to the technical field of technical lithium batteries, and provides a lithium titanate coated positive electrode material for a power battery and a preparation method. The methodcomprises the following steps: mixing a positive electrode material precursor with graphene oxide, performing heating to form a positive electrode material precursor coated with graphene oxide hydrogel, adding butyl titanate, performing reaction with a lithium source, and performing coating in a graphene oxide hydrogel grid to prepare the lithium titanate coated positive electrode material. Comparing with a material prepared through a traditional method, the prepared lithium titanate coated positive electrode material can effectively inhibit the gas expansion caused by contact between lithiumtitanate and an electrolyte because the surface of the positive electrode active material is uniformly coated with the formed graphene oxide / lithium titanate composite material. Meanwhile, the preparation process is simple, the process is easy to control, and the lithium titanate-coated positive electrode material has a good prospect in large-scale industrial production.

The invention discloses electrolyte, a preparation method for the same and a high-voltage lithium ion battery. The electrolyte mainly comprises an organic solvent, conductive lithium salt and an additive, wherein the organic solvent is prepared from more than one of a cyclic carbonate solvent, an aromatic hydrocarbon solvent and a linear solvent; the concentration of the conductive lithium salt in the organic solvent is 0.8 to 1.5mol / L; the using amount of the additive is 0.1 to 10.0 percent based on the weight of the organic solvent, and the additive is a halogenated cyanophenyl compound. After the additive is added into the electrolyte, a polymer film can be formed on the surface of each of a positive electrode and a negative electrode, so that the interface impedance of the electrodes / electrolyte is reduced, the decomposition of the electrolyte on the surface of an electrode material is suppressed, and the prolonging of cycle life of the high-voltage lithium ion battery (higher than 4.4V), the improvement of high / low-temperature performance of the high-voltage lithium ion battery and the suppression of gas expansion of the battery are facilitated.

The invention discloses a battery electrolyte, and also discloses a lithium-ion battery containing the electrolyte. By adding acid anhydride derivative additives to the battery electrolyte, the problem of flatulence of the battery can be improved. At the same time, the acid anhydride derivative The additive contains O, N, Si, F and other elements. When it is used as an electrolyte additive, it has good compatibility with positive and negative electrode materials, which can effectively inhibit battery flatulence and improve battery high-temperature cycle performance.

The invention discloses an electrolyte suitable for an NCM system and a battery. The electrolyte comprises an organic solvent, electrolyte lithium salt and additives, and the additives comprise ethylene sulfate accounting for 0.1%-10% of the total mass of the electrolyte, succinic anhydride accounting for 0.1%-5% of the total mass of the electrolyte, ethyoxyl (pentafluoro) cyclotriphosphazene accounting for 0.1%-15% of the total mass of the electrolyte and diphenyl carbonate accounting for 0.01%-5% of the total mass of the electrolyte. The electrolyte and the battery provided by the invention not only have excellent electrochemical performance at normal temperature and high temperature, but also are obviously improved in the aspects of overcharge and flame retardance; therefore, the material has a wide application prospect in batteries of high-energy density systems in the future.

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.

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.

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.