1294 results about "High temperature storage" patented technology

The invention discloses a lithium ion battery and a positive material, the positive material possesses a core-shell structure, the material of a core layer is at least one of lithium cobaltate, a ternary material and a lithium manganese material, the material of a shell layer is lithium nickel manganese spinel. The preparation method comprises the following steps: preparing the sol shell layer material, then adding the core layer material in the sol, stirring, drying and calcining to prepare the lithium ion battery positive material with the core-shell structure. In addition, the invention also discloses the lithium ion battery prepared by the positive material with the core-shell structure, the end of charge voltage is 4.3-4.7V(vs. Li), the lithium ion battery has excellent charge and discharge cycling performance and high temperature storage performance under high voltage.

The invention discloses a lithium manganese oxide material and a preparation method thereof, in particular to a high-crystallinity lithium manganese oxide material and a preparation method thereof, wherein the high-crystallinity lithium manganese oxide material is used for coating a lithium ion battery. The lithium manganese oxide material is obtained by being coated on a lithium manganese oxide precursor with the one-time crystal particle of 0.01-20mum and has the general formula of LiaMn2-b-cMbGcO4-d-eXdZe, wherein M and X are doped elements, G and Z are coating elements of which the concentration is distributed in a decreasing gradient from outside to inside, a is not less than 0.9 and is not more than 1.2, b is not less than 0 and is not more than 0.2, c is more than 0 and is not more than 0.2, d is not less than 0 and is not more than 0.2, and e is not less than 0 and is not more than 0.2. The material serves as the positive pole material of the lithium ion battery, has better normal-temperature and high-temperature cycle performance and excellent high-temperature storage performance, is simple in preparation and easy to operate, control and carry out industrial production.

The invention relates to the technical field of lithium ion batteries, in particular to a ternary cathode material lithium ion battery and an electrolyte thereof. The electrolyte comprises a non-water-based organic solvent, lithium salt and an additive. The additive comprises 1,3-propane sultone, a compound with the structural formula I or II, and a compound containing an M-O-Si functional group. M is any one of B, C, N, P, S and Al. Compared with the prior art, the ternary cathode material lithium ion battery with the electrolyte can normally work within the range of high voltage of 4.4 V or above, rise of internal resistance of the battery is restrained when the battery is used in high-pressure and low-temperature environments, the high-temperature storage performance and a low-temperature discharging platform of the battery are effectively improved, and excellent circulation performance and storage performance can be achieved within the wide temperature range.

The invention provides a silicon-based composite material, which is prepared from silicon particles, silicate and optional carbon, wherein the mixture of the silicate and the optional carbon forms a massive body, and the silicon particles are dispersed in the massive body. A preparation method comprises the following steps of: dispersing the silicon particles into absolute ethyl alcohol and/or deionized water to form suspension liquid; dispersing the silicate and the optional carbon into the absolute ethyl alcohol and/or the deionized water to form suspension liquid; ultrasonically oscillating the two kinds of suspension liquid respectively, and then stirring; dropwise adding the suspension liquid of the silicon particles into the suspension liquid of the silicate and the optional carbon to form mixed liquid, heating and stirring the mixed liquid until evaporating the mixed liquid into paste; then, putting the paste in an oven to be dried to obtain masses, and grinding and sieving to obtain undersize particles; and conducting heat treatment in an inert atmosphere, and grinding and sieving to obtain the silicon-based composite material. According to the silicon-based composite material, a lattice structure of the silicon particles can be ensured, therefore the activity of the silicon particles is ensured, and the energy density, the first-time coulomb efficiency and the high-temperature storage performance of lithium ion batteries are increased.

The invention discloses a composite asphalt modifier as well as a preparation method and an application method of the composite asphalt modifier. The composite asphalt modifier comprises a polymer, a compatilizer, an anti-aging agent, a nano material and a chemical additive, and is prepared by evenly mixing the components at the temperature of 0-200 DEG C. The application method of the composite asphalt modifier comprises two ways of: 1. mixing the composite asphalt modifier with matrix asphalt at the temperature of 120-210 DEG C for 10-500minutes to prepare modified asphalt composition; and 2, mixing the compatilizer, the matrix asphalt, the polymer, crosslinking body and the composite asphalt modifier at the temperature of 120-210 DEG C for 10-500minutes to prepare another modified asphalt composition. The modified asphalt compositions prepared by the method have good high, low temperature performance and high-temperature storage stability.

The invention discloses a lithium ion power battery non-water electrolyte. The lithium ion power battery non-water electrolyte is prepared from, by weight, 100 parts of solvents, common lithium salts, 0.2-10 parts of anode film formation additives, 0.2-10 parts of circulation improvement additives and 0.01-0.5 part of acid and water removal additives. The solvents are cyclic carbonic ester and/or chain carbonic ester, and the molar concentration of the common salts in the solvents is 0.8-1.5 mol/L. Due to the combination use of the anode film formation additives, the circulation improvement additives and the acid and water removal additives, during first formation, a CEI film can be formed on the surface of an anode, the stability of a cathode SEI film can be improved, and the normal temperature circulation performance, the high-temperature 45 DEG C circulation performance and the high-temperature storage performance of a power battery can be remarkably improved.

An object is to provide a non-aqueous electrolyte solution that can improve the capacity deterioration and gas generation associated with the high-temperature storage of non-aqueous electrolyte batteries. A further object is to provide a non-aqueous electrolyte battery that uses this non-aqueous electrolyte solution. These objects can be achieved by using a non-aqueous electrolyte solution that incorporates, in prescribed contents, (A) a compound having at least two isocyanate groups per molecule and a compound having at least two cyano groups per molecule.

A nickel-metal hydride secondary battery comprising electrode group comprising positive electrode comprised mainly of nickel hydroxide, negative electrode comprised mainly of a hydrogen storage alloy, and separator being disposed between the positive electrode and the negative electrode, wherein the electrode group is sealed in battery casing, together with an alkali electrolyte liquid, wherein, in the battery, a W element and an Na element are present simultaneously. The nickel-metal hydride secondary battery of the present invention is advantageous not only in that it exhibits high utilization of the active material and excellent self-discharge characteristics in a high temperature storage as well as high charging efficiency in a high temperature environment, but also in that it has excellent large current discharge characteristics.

The invention discloses an electrolyte additive and an application thereof in a lithium ion battery. The electrolyte additive comprises a polynitrile-based compound and a compound comprising a sulfur bond and an oxygen bond. When the electrolyte additive is applied to the lithium ion battery, good cycle life, good low-temperature discharging property and good high-temperature storage property of the lithium ion battery under the high voltage still can be maintained.

The invention relates to an SBS (styrene-butadiene-styrene)/scrap rubber powder composite modified asphalt which comprises the following components in parts by weight: 75-96 parts of matrix asphalt, 0.5-12 parts of scrap rubber powder, 0.5-6 parts of SBS, 0.2-8 parts of modified inorganic substance powder, 0.1-8 parts of compatilizer and 0.1-3 parts of crosslinking agent. The preparation method comprises the following steps: preparing the scrap rubber powder; heating the matrix asphalt to 160-180 DEG C, adding the compatilizer while stirring, and evenly mixing; adding the SBS scrap rubber powder and modified inorganic substance powder, stirring at the speed of 1000-5000 rpm for 5-125 minutes while keeping the temperature, and adding the crosslinking agent; and quickly stirring for 20-300 minutes while keeping the temperature. The key technical indexes of the product are higher than those of the SBS modified asphalt; and the invention enhances the high/low-temperature properties and aging resistance, prolongs the high-temperature storage stabilization period, and completely satisfies the property requirements for national high-grade roads.

This invention relates to complex lithium metal oxides, which are cathode active materials of a lithium or lithium ion secondary battery with enhanced cycle life and safety, and a process for preparation thereof. The core particles are complex lithium metal oxides capable of absorbing, storing and emitting lithium ions, and a coating layer comprised of amorphous complex lithium cobalt oxides that are formed on the surface of the core particle, which is structurally stable and inactive with electrolytes. Because the amorphous complex lithium cobalt oxides are inactive with electrolytes, the oxides stabilize the surface structure of the complex lithium metal oxide and improve on high temperature storage properties, as well as safety and cycle life.

The invention relates to the technical field of lithium-ion batteries, in particular to an electrolyte of the lithium-ion battery and the lithium-ion battery containing the electrolyte. The electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises a film-forming additive A and a stabilizing additive B; the stabilizing additive B is a chainlike disulfonic acid ester compound as shown in a formula I and/or a formula II; and the film-forming additive A forms an SEI film on a negative electrode surface of the battery and the side reaction of a negative electrode interface and the electrolyte is reduced, so that the film-forming additive A is an necessary precondition that the battery has relatively good cycle performance. The stabilizing additive B can form a CEI film on a positive electrode surface, the activity of a positive electrode interface and the electrolyte is inhibited, direct contact oxidation of a positive electrode and the electrolyte is reduced, meanwhile, the structure stability of a positive electrode material is improved and the structure is not easy to collapse and crush due to generation of the stress, so that the electrolyte has excellent high-temperature storage performance and high-temperature cycle performance through combination of the additive A and the additive B.

The invention relates to non-aqueous electrolyte of a lithium ion battery. The non-aqueous electrolyte comprises an organic solvent, lithium salt and a phosphate-ester type compound. The invention also discloses the lithium ion battery. The non-aqueous electrolyte has the beneficial effect that the high-temperature storage performance and the circulating performance of the battery are improved.

The invention discloses a high-capacity lithium-ion battery electrolyte of considering high-and-low temperature performance. The electrolyte comprises a non-aqueous solvent, lithium hexafluorophate, a negative film-forming additive, an inflatable inhibition additive and a low-impedance additive, wherein the negative film-forming additive is prepared from fluoroethylene carbonate which accounts for 3%-15% of total mass of the electrolyte; the inflatable inhibition additive is prepared from one or two of 1,3-propene sultone or anhydride compounds which account for 0.3%-5% of total mass of the electrolyte; and the low-impedance additive is prepared from one or two of lithium difluorophosphate and difluoride phosphate lithium oxalate which account for 0.2%-3% of total mass of the electrolyte. The electrolyte is suitable for a high-nickel positive electrode and silicon-carbon composite negative electrode lithium-ion battery; the high-temperature storage performance and the low-temperature discharge performance of the lithium-ion battery are improved while the room-temperature cycle performance is considered; and meanwhile, the invention further provides a preparation method of the electrolyte and the high-capacity lithium-ion battery of using the electrolyte.

The invention relates to an anode material for a lithium ion secondary battery. The anode material comprises anode active substance, a conductive agent and a caking agent, wherein the anode active substance comprises material A and material B. The material B is the oxide C of plated metal lithium and/or the oxide D of plated metal lithium which are coated and processed by the material A. The material A is the lithium phosphate slat with a olivine structure. The anode material can obviously improve the safety performance of the lithium ion secondary battery; the battery has a big capacity; the anode material has a good performance of charge and discharge for a big current, circulation and high temperature storage.

This invention provides a nonaqueous electrolyte which is excellent in discharge load properties, as well as in high-temperature storage stability, cycling characteristics, high capacitance, continuous charge properties, storage stability, gas evolution suppression in continuous charging, charge/discharge properties at a high current density, discharge load properties and the like, and a rechargeable battery with a nonaqueous electrolyte. The nonaqueous electrolyte contains a monofluorophosphate and/or a difluorophosphate and further contains a compound having a specific chemical structure orspecific properties.

A positive electrode material that can form a positive electrode mixture containing composition with reduced changes over time and high productivity, a manufacturing method thereof, a non-aqueous rechargeable battery less likely to swell and having a high storage characteristic during storage at high temperatures, and a positive electrode that can form the battery are provided. The object is solved by providing a positive electrode material having a coating layer of an organic silane compound on a surface of a positive electrode active material made of a lithium nickel composite oxide represented by the general compositional formula (1): Li_1+xMO₂ where −0.5≦x≦0.5, M represents a group of at least two elements including at least one of Mn and Co and Ni, and 20≦a≦100 and 50≦a+b+c≦100 when the ratios (mol %) of Ni, Mn, and Co in the elements forming M are a, b, and c, respectively.

The invention discloses a high-voltage rate electrolyte with high-and-low temperature performance and a lithium ion battery using the electrolyte. The electrolyte comprises a non-aqueous solvent, a lithium salt dissolved in the non-aqueous solvent and additives, wherein the non-aqueous solvent comprises propylene carbonate (PC) and linear carboxylic ester; and the additives comprise citraconic anhydride, lithium difluorophosphate (LiPO<2>F<2>), fluoroethylene carbonate, ethylene sulfate and 1, 2-di(2-cyanoethoxyl)ethane. By applying the synergistic effect generated by the solvent system and the additive optimization combination to the lithium ion battery, excellent cycle life, low-temperature discharge characteristic and high-temperature storage characteristic of the battery still can be maintained at high-voltage rate.

The invention discloses high-voltage electrolyte and a lithium ion battery using the electrolyte. The invention is realized by the following technical scheme: the high-voltage electrolyte comprises a non-aqueous solvent, lithium salt and an additive, wherein the non-aqueous solvent is a carboxylic ester compound which accounts for 1-40% by mass of the high-voltage electrolyte; the additive is any one or more of lithium bis(oxalate)borate (Li BOB), fluoroethylene carbonate (FEC) and ethylene glycol bis(propionitrile) ether. The high-voltage electrolyte contains carboxylic ester solvents capable of improving an electrode/electrolyte interface, and through optimized combination of the carboxylic ester solvents, Li BOB, FEC, ethylene glycol bis(propionitrile) ether and other various additives, the good cycle performance of a high-voltage battery can be ensured, meanwhile, the high-temperature storage performance of the high-voltage battery can be effectively improved, and gas generation of the battery under high-voltage high-temperature storage condition can be obviously inhibited.

The use of lithium bis(oxalate)borate (LiBOB) as an additive in a lithium secondary battery provides improved battery performance such as long life and high capacity retention after high temperature storage.

The present invention intends to provide a power semiconductor device using a high-temperature lead-free solder material, the high-temperature lead-free solder material having the heat resistant property at 280° C. or more, and the bondability at 400° C. or less, and excellent in the suppliabilty and wettability of solder, and in the high-temperature storage reliability and the temperature cycle reliability. In the power semiconductor device according to the present invention, a semiconductor element and a metal electrode member were bonded each other by a high-temperature solder material comprising Sn, Sb, Ag, and Cu as the main constitutive elements and the rest of other unavoidable impurity elements wherein the high-temperature solder material comprises 42 wt %≦Sb/(Sn+Sb)≦48 wt %, 5 wt %≦Ag<20 wt %, 3 wt %≦Cu<10 wt %, and Ag+Cu≦25 wt %.

The present invention relates to an electrolyte for a lithium ion rechargeable battery and a lithium ion rechargeable battery including the same. The electrolyte includes a non-aqueous organic solvent, a lithium salt, and triphenyl phosphate. A lithium ion rechargeable battery including the electrolyte has improved overcharge stability and shows excellent chemical properties including reducing swelling, high-temperature storage stability, and cycle life characteristics.