174results about How to "Extended storage life" patented technology

The invention discloses a lithium ion battery full charge storage service life evaluation method. The method comprises steps: a battery sample for evaluation of lithium ion battery full charge states is stored at a plurality of storage temperature values T for appointed sampling time t, a capacity loss rate Q is obtained, and experiment data are generated; a capacity attenuation aged model is established, and values of a model parameter rho and a model parameter a are determined; the selection rationality of the storage temperature scope is determined based on the situation whether the model parameter a meets the Arrhenius formula at each storage temperature value T; a mean value and a standard deviation standard deviation of a model A and a model B are obtained through statistics; the value of the model parameter rho and the mean value of the models A and B are substituted into the model and fitting goodness determination is carried out; after fitting goodness is met, the service life of the lithium ion battery to be evaluated is predicted at a normal temperature and a service life distribution diagram is obtained. The evaluation method has advantages of sufficient service life evaluation principle, high data reliability, high precision, short evaluation time, wide application scope, is simple and practicable, and is easy to implement.

The invention relates to an anode material of a Li-ferrous disulfide battery and the Li-ferrous disulfide battery, belonging to the battery field. The anode material of the Li-ferrous disulfide battery comprises the following ingredients by weight percentage: 50-99.5 percent of ferrous disulfide powder, 0.25-25 percent of bonder, 0.25-25 percent of conductive agent and the balance first main group element compounds accounting for 0.4-10 percent of the quality of the ferrous disulfide powder; the first main group element compounds comprise one ore more o carbonate, bicarbonate, silicate, germanate, acetate, phosphate, aluminate, titanate and amino salts. In the invention, the added first main group element compounds greatly improve the discharging platform and discharging performance of the battery, the discharging platform of the battery is high, the discharging time is long, the discharge capacity is large, the heavy-current discharging property is good and the storage life is long.

The invention discloses a photochromic material for blue light storage, which is prepared by mixing one or more of 1-30% inorganic aqueous solutions or colloidal sols with 1-20% of organic molecular solution, agitating and making films on clean substrates with the obtained colloidal sol through casting method or rotary coating method.

The invention provides an electrode assembly and a lithium ion battery. The electrode assembly comprises a positive pole piece, an isolating membrane and a negative pole piece, wherein the negative pole piece comprises a negative current collector and a negative active material layer, and further comprises a metal lithium layer, the metal lithium layer is formed by a plurality of regular or irregular strip-shaped lithium-rich areas, and the plurality of lithium-rich areas are distributed at intervals in the length direction of the negative pole piece in a non-continuous form. The electrode assembly also satisfies the following conditions: the ratio of the negative electrode capacity per unit area to the positive electrode capacity per unit area is 1.2-2.1, and the ratio of the negative electrode capacity per unit area to the sum of the positive electrode capacity per unit area and 80% of the capacity of the metal lithium layer on the surface of the negative electrode active material layer per unit area is greater than or equal to 1.10. The lithium ion battery disclosed by the invention has relatively high lithium supplementing efficiency and relatively low direct-current impedance,and meanwhile, the lithium ion battery also has long cycle life and storage life.

The invention discloses an electrolyte for a lithium battery. The electrolyte contains a pyridine ionic liquid, and the pyridine ionic liquid contains cations and anions; the cations are N-alkylpyridine; the anions are one kind of the anions of a group consisting of aluminum tetrachloride acid radical ions, gallium tetrachloride acid radical ions, tetrafluoroboric acid anions, hexafluorophosphoric acid anions, bis(trifluoromethanesulphonyl)imine anions, lactic acid anions, p-methyl benzene sulfonate acid radical anions, acetyl sulfonyl imide anions, saccharin anions, amino acids anions, sulfuric acid ester anions, succinic acid diisooctyl ester sulfonate radical anions, 4,5-dimetridazloe anions, and 5-nitrotetrazolato anions. The electrolyte can inhabit increasement of a metal lithium surface passivatin layer (an SEI film) in the lithium battery, and can significantly improve storage performance of the battery. Furthermore, the invention further discloses a preparation method for the electrolyte and the lithium battery containing the electrolyte.

A silver-containing alkaline electrochemical cell and methods for producing the cell, wherein the cell includes a negative electrode, a positive electrode, a separator disposed between the electrodes, and an alkaline electrolyte, wherein the positive electrode is formed as a multi-layer composite including a silver-containing oxide layer and a barrier layer, initially free of silver-containing material, disposed between the silver-containing oxide layer and the separator for substantially reducing migration of silver ions to the separator and negative electrode.

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.

An optical disc based external data storage system for a database comprises a server, and a magnetic disk storage device and an optical disk storage device both connected with the server in a data mode. A database management system, an external storage management system, an application program interface and an extension server are arranged on the server. A magnetic disk database and a database external storage zone are arranged on the magnetic disk storage device. Parts of field data recorded in the database are correspondingly stored in the database external storage zone. The database management system responds to data requests, and database management and data management in the storage device are completed. The external storage management system responds to data requests, and database external storage zone management and data management in the storage device are completed. The application program interface is used for obtaining information of database external storage data, and database external storage of the storage device is completed. The extension server is used for establishing the database external storage zone and determining the positions of the database external storage data in the external storage zone. Database performance and data reliability can be well improved.

The invention relates to the field of alkaline zinc-manganese dioxide cells, and specifically relates to an alkaline zinc-manganese dioxide cell. The alkaline zinc-manganese dioxide cell comprises a positive electrode cap (1), a positive electrode ring (2), a steel shell (3), a current collector copper nail (4), a negative electrode zinc gel (5), diaphragm paper (6), a sealing ring (7), a supportring (8) and a negative electrode bottom (9); the positive electrode ring (2) is composed of electrolytic manganese dioxide, conductive agent graphite and electrolyte; and the negative electrode zincgel (5) comprises zinc powder, a binding agent, an expanding agent, an electrolyte potassium hydroxide solution and polyethylene glycol 2000. According to the alkaline zinc-manganese dioxide cell provided by the invention, the discharge performance of the alkaline zinc-manganese dioxide cell is not influenced or even slightly improved, and the problem of expansion of the zinc gel is effectively solved; and meanwhile, the hydrogen content of the cell is remarkably reduced, and the liquid leakage risk of the cell is greatly reduced, therefore, the discharge performance of the cell is effectivelyimproved, the storage life of the cell is prolonged, and the safety performance of the cell is remarkably improved.

The invention provides a formation method for a lithium ion battery with a long storage life. An anode active substance in the lithium ion battery consists of LiNi0.7Mn0.2Ni0.1O2; the electrolyte of the lithium ion battery comprises additive consisting of vinylene carbonate (VC) and fluoroethylene carbonate (FEC), wherein the VC occupies 0.5-1% of the total volume of the electrolyte, the FEC occupies 1.5-4% of total volume of the electrolyte, and the volume content ratio FEC/EC of the FEC and the VC is above 2. The formation method comprises a staged formation technology and a staged exhaust technology, a stable SEI (Solid Electrolyte Interphase) membrane is formed, anode surface metal can prevent from being dissolved in a battery storage process, and a self-discharge phenomenon is avoided.

A new rocket motor assembly configuration is disclosed. Amine based oxidizer is decomposed in the presence of a metallic catalyst to generate an oxygen rich hot gas stream. The hot gas stream is used to trigger a Magnesium based solid fuel in the combustion chamber. The thrust of the rocket motor may be regulated at multiple points. This design thus offers an IM compliant, thrust-adjustable rocket motor that is of a low hazard classification without compromising its performance.

The invention discloses a differential architecture storage unit for improving the NBTI (Negative Bias Temperature Instability) effect of a P-type NVM (Non Volatile Memory). The storage unit is composed of a P-type NVM storage unit and an NBTI recovery circuit, wherein the P-type NVM storage unit is of a floating gate type architecture or is a logic structure NVM storage unit based on a standard CMOS (Complementary Metal Oxide Semiconductor) process. By adopting a differential architecture based on the traditional P-type NVM storage unit, the matching property of bit line signals input to a differential amplifier is ensured, and the reliability and stability of the storage unit are improved; and the recovery circuit is simultaneously added to reduce the influence of the NBTI effect after the P-type NVM works under a high voltage, so that the power consumption of the circuit can be effectively reduced, and the overall stability of the memory is improved. The stability of the storage unit is obviously improved, and the storage unit has important research significance and broad market prospect.

The invention provides a copper nitride modified lithium battery material and a preparation method and application thereof, wherein the lithium battery material comprises a lithium battery base material and a copper nitride coated on or incorporated into the lithium battery base material, wherein the copper nitride is of the formula CuAN, wherein 0.5 <= A <= 4. The copper nitride modified lithiumbattery material provided by the invention can effectively inhibit the lithium dendrite growth of the lithium battery and improve the cycling performance. The battery provided by the invention has better safety, cycle life, power density, magnification performance, energy efficiency and storage life.

The invention relates to a high-specific-energy lithium battery electrode, a dry preparation method thereof and a lithium battery. The method comprises the following steps: under a heating condition,uniformly mixing an electrode material and a processing aid according to the mass of the processing aid accounting for 10%-80% of the total mass of the electrode material and the processing aid to form a paste mixture, wherein the electrode material comprises an electrode active substance, a conductive agent and an adhesive, the processing aid comprises one or a combination of more than one of Poly(ethylene carbonate) (PEC), Poly(propylene carbonate)(PPC), Poly(butylene carbonate)(PBC), Poly(cyclohexene carbonate) (PPC) and Poly(trimethylene carbonate) (PTMC); carrying out roll forming on thepaste mixture, and then carrying out hot pressing on a current collector to obtain an electrode plate; and carrying out heat treatment on the electrode plate under a vacuum condition to obtain the high-specific-energy lithium battery electrode.

The invention provides modified melamine formaldehyde resin with high flexibility. The modified melamine formaldehyde resin is prepared from the following raw materials in parts by weight: 100 parts of melamine, 160-220 parts of formaldehyde, 10-20 parts of isocyanurate, 5-10 parts of fatty acid amide, 5-8 parts of polyethylene glycol, 3-6 parts of alkylphenol polyoxyethylene ether, 2-5 parts of sodium hydroxide, 40-60 parts of alcohol and 20-30 parts of water. The modified melamine formaldehyde resin with high flexibility disclosed by the invention can be used for effectively prolonging the polymerization time of the modified melamine formaldehyde resin, increasing the storage period of the modified melamine formaldehyde resin and improving the flexibility of the resin. A resin modifying component contained in the modified melamine formaldehyde resin with high flexibility can participate in the copolycondensation reaction of the resin to change the resin structure, so that the cross-linking density is lowered, and thus, the foam strength is increased, the flexibility is increased and the brittleness is lowered. The modified melamine formaldehyde resin is full of elasticity and the stability of the modified melamine formaldehyde resin is increased.

The invention provides a fluoride/oxide co-coated positive electrode material which comprises a positive electrode material main body, a composite coating layer and a diffusion doping layer, and is characterized in that the composite coating layer is a continuous coating film formed by uniformly coating the surface of the positive electrode material main body with oxyfluoride; and the diffusion doping layer is formed by diffusing partial metal element ions in the composite coating layer to the surface layer of the positive electrode material main body. The invention also provides a preparationmethod of the fluoride/oxide co-coated positive electrode material. The positive electrode material provided by the invention has relatively good cycling stability, storage life, high-temperature performance and safety performance under high voltage.

The invention relates to a preparation method of an organic electrolyte capable of improving heat stability of a lithium-ion battery. The method comprises the following steps: (1) mixing two or more organic solvents at a room temperature at equal mass ratio after removing impurities, so as to obtain a mixed solvent; (2) lastingly stirring the mixed solvent and adding various lithium salts with different contents to obtain a series of electrolytes without an additive; and (3) adding a flame-retardant additive and other functional additives to the electrolytes without the additive, so as to obtain the lithium-ion battery electrolyte with relatively good heat stability. According to the preparation method, the heat stability of the electrolyte can be improved; the safety performance and the cycle performance of the electrolyte at a high temperature can be improved; prolonging of the cycle lifetime and the storage lifetime of the lithium-ion battery is facilitated; and the method is simple in technique, low in cost, suitable for industrial production, and relatively wide in application prospect.

The invention provides a high-stability high-toughness melamine resin modifier. The melamine resin modifier is prepared from the following components in percentage by mass: 30-50% of fatty acid amide, 20-40% of polyethyleneglycol, 10-20% of alkylphenol polyoxyethylene and 10-30% of water. The melamine resin modifier is prepared by the following steps: putting the components in a proper container, slowly heating to 50-80 DEG C, stirring uniformly until all the components are dissolved, and cooling to room temperature to obtain the melamine resin modifier. The melamine resin modifier can effectively prolong the polymerization time of the melamine formaldehyde resin, increase the storage cycle and improve the toughness of the resin.

A thermally curable hot-melt adhesive composition, comprising

• • a polyurethane prepolymer having isocyanate groups, wherein at least 50% of the reactive isocyanate groups of the prepolymer are blocked, said prepolymer being the reaction product of
    • (1) 20 to 40 wt % of at least one straight-chain amorphous polyester having a number average molecular mass Mn of 3000 to 6000 with
    • (2) 40 to 60 wt % of at least one polyurethane elastomer,
    • (3) 10 to 20 wt % of at least one polyester elastomer,
    • (4) at least one diisocyanate,
    • (5) at least one polyol as a chain extender, and
    • (6) at least one blocking agent; and
  • at least one isocyanate reactive component selected from the group consisting of polyalcohols, polyamines and hydroxy-functionalized epoxide resins;

wherein the percentages are based on the total weight of polyester, polyurethane elastomer and polyester elastomer.

The invention provides an anode sizing agent, an anode pole piece and a lithium ion battery. The anode sizing agent comprises an anode active material, a conductive agent and a binding agent; the anode active material comprises a first anode active material grain of which pH value is not less than 11.5. The binding agent comprises fluorine-containing polymer. The anode sizing agent further comprises additive. The anode sizing agent has good mobility and stability, and can effectively solve the gel, jelly, and agglomeration problems during the processing of the anode pole piece, improving the production efficiency, ensuring the consistence of the lithium ion battery while improving the storage life and high-temperature circulatory stability of the lithium ion battery under the high voltage.