44results about How to "Good discharge performance at low temperature" patented technology

The invention belongs to the technical field of lithium ion batteries and particularly relates to electrolyte for a lithium ion battery with a nickel-based cathode. The electrolyte comprises non-aqueous organic solvent, lithium salt, boron-containing lithium salt additive, cyclic ether compound and cyclic phosphonitrile compound. The cyclic phosphonitrile compound is hexaphenoxycyclotriphosphazene or cyclic phosphonitrile derivative. Compared with the prior art, the electrolyte is provided with the boron-containing lithium salt additive capable of improving high temperature performance of the lithium ion secondary battery with nickel-based cathode material, the cyclic phosphonitrile compound, and the cyclic ether compound, and the addition of the cyclic phosphonitrile compound and the cyclic ether compound enables the battery to be fine in high temperature performance, low temperature performance and cycle performance. In addition, the invention discloses the lithium ion battery comprising the electrolyte.

The invention discloses a low temperature type lithium ion battery electrolyte with high temperature property and lithium ion battery. The electrolyte is made by uniformly mixing and confecting electrolytic salt, non-water organic solvent, alkali additive and film-forming additive, the electrolytic salt is mixed lithium salt made by uniformly mixing lithium tetrafluoroborate and lithium bis(oxalate)borate, and the mol ratio of the two is 96-73: 4-27, the concentration of the mixed lithium salt solution formed by the electrolytic salt and the non-water organic solvent is 0.8-1.2mol/L; the alkali additive is heptamethyldisilazane and the mass ratio of the hepatmethyldisilazane and the non-water organic solvent is 0.1-8%; the mass ratio of the film-forming additive and the non-water organic solvent is 0.1-5%; and the lithium ion battery comprises an anode, a cathode, a diaphragm and low temperature type lithium ion battery electrolyte with high temperature property. The invention has reasonable design, simple preparation method steps and convenient implementation, and the prepared electrolyte and lithium ion battery have favourable comprehensive performances.

The negative electrode active material for lead-acid colloid storage battery with long circulating service life, good charging and discharging performance and strong weatherability is a paste-like compound which is made up by mixing the following raw materials: (wt%) sulfuric acid 5-10%, deionized water 7-11%, short fibre 0.05-0.2%, modified lignin 0.02-0.10%, barium sulfate 0.1-1.2%, acetylene black 0.05-0.2%, SnO2 0.05-0.2% and the rest lead powder. The adoption of lead-acid colloid storage battery made up by said invention is applicable to energy storage for utilization of solar energy, etc.

The invention discloses a low-temperature nano lithium iron phosphate, and a preparation method and application thereof. The low-temperature nano lithium iron phosphate is produced through the following steps of: carrying out self-division of a lithium source, an iron source and a phosphorus source in the sintering process through nonstoichiometric induction, thereby forming particles which are at non-perfect crystalline state and have primary grain size ranging from 20 to 300nm; and then performing stoichiometric regulation and sintering by supplementing the lithium source and the phosphorus source, thereby forming particles which are at perfect crystalline state and have a primary grain size ranging from 20 to 300nm, thus obtaining the low-temperature nano lithium iron phosphate. The low-temperature nano lithium iron phosphate provided by the invention has high specific capacity and excellent low-temperature discharge performance; and the method for preparing the low-temperature nano lithium iron phosphate does not need grinding equipment or a high-pressure kettle, so that the unit energy consumption and the equipment investment are greatly reduced; and the method is low in wastewater emission and environmental pollution; besides, the method is simple in production flow, does not need severe conditions and is easily industrialized.

The present invention provides an electrolyte for a lithium ion battery and a lithium ion battery comprising the electrolyte. The electrolyte comprises a non-aqueous organic solvent, an additive and aconductive lithium salt. The additive comprises a grafted polysilane compound and a low-impedance lithium salt compound. Si-H bonds in the grafted polysilane compound are oxidized and cross-linked onthe surface of a positive electrode to generate a protective film with relatively high rigidity and a Si-O-Si cross-linked structure, so that the grafted polysilane compound has relatively high thermal stability, and the safety performance and the high-temperature storage performance of a battery can be improved. Meanwhile, the polymer can be used in the battery charging and discharging process;a sulfur-containing cyclic ester group can be matched with a low-impedance lithium salt compound on the surface of a negative electrode in a ring opening manner to form a composite SEI film of thin-layer polysulfate with a tough structure and a low-impedance inorganic framework, and the SEI film has relatively high conductivity to Li <+>, so that the battery has excellent low-temperature dischargeperformance.

The invention belongs to the technical field of lithium-ion battery electrolyte preparation, in particular to a lithium-ion electrolyte with a wide temperature range. The electrolyte is composed of 10-20wt% of electrolyte lithium salt, 2-8wt% of additive and residual solvent. By using the electrolyte lithium salt capable of improving the high temperature performance and the solvent with a wide liquid path temperature range and combining the raw materials at a certain amount, the electrolyte has both good high temperature performance and good low temperature discharge performance, and finally,the use temperature range of the electrolyte is widened.

The invention provides a negative electrode material as well as a preparation method and application thereof. The first aspect of the invention provides a negative electrode material. The negative electrode material comprises matrix particles and carbon nanotubes, wherein the carbon nanotubes are attached to the surfaces of at least part (0.1-2%) of the matrix particles; and the matrix particles are composed of graphite particles and a coating layer, and at least part of the surfaces of the graphite particles are covered with the coating layer. According to the negative electrode material provided by the invention, by attaching the carbon nanotubes to the surfaces of at least part of the matrix particles, the one-dimensional carbon nanotube structure is combined with a zero-dimensional material, and the carbon nanotubes not only enable the surfaces of the matrix particles to be rough, but also increase the contact between the matrix particles, so that the resistance of the negative electrode material is reduced, and the conductivity of the negative electrode material is improved; in addition, the carbon nanotubes can also improve the mechanical strength of the matrix particles, andthe low-temperature discharge performance of the lithium ion battery is further improved.

The invention discloses a low-temperature electrolyte for a lithium cobalt disulfide primary battery and the lithium cobalt disulfide primary battery. The low-temperature electrolyte comprises a lithium salt, a solvent and a first additive, wherein the total volume molar concentration of the lithium salt in the solvent is 0.5-2 mol/L, and the addition amount of the first additive is 0-10% of the total volume of the solvent; the lithium salt comprises any one or more than two of lithium bis (trifluoromethanesulfonate) imide, lithium iodide and lithium tetrafluoroborate; the solvent comprises any two or more than two of propylene carbonate, 1, 3-dioxolane and ethylene glycol dimethyl ether; and the first additive is selected from at least one of methyl acetate, ethyl acetate, ethyl acrylate,tetrahydrofuran, fluoroethylene carbonate and fluorodiethyl carbonate. The problem that an existing lithium primary battery cannot discharge or is low in discharge capacity at the low temperature of-40 DEG C is solved, and the high-rate discharge performance of the battery at the temperature of -40 DEG C can be remarkably improved through the provided electrolyte.

A lithium ion battery cell comprises a positive plate, a negative plate, a septum between the positive plate and the negative plate and an overlay which is painted on an exterior layer of the battery cell and contains inorganic oxide particles and an adhesive. The inorganic oxide is one or a plurality of the following components: titanium oxide, alumina, magnesia and silicon dioxide. The low-temperature discharging property of the battery cell is excellent; and simultaneously, the preparation technique is simple and is easy for industrialization.

The invention relates to non-aqueous electrolyte of a primary lithium battery. The non-aqueous electrolyte comprises a lithium salt, a high-flash-point and low-melting-point solvent and a low-viscosity solvent, wherein the high-flash-point and low-melting-point solvent comprises at least one of propylene carbonate, dimethyl methylphosphonate, diethyl methylphosphonite, diethyl ethanephosphonate, dimethyl ethylphosphonate and gamma-butyrolactone; the flash point of the high-flash-point and low-melting-point solvent is greater than 60 DEG C; the melting point is less than 40 DEG C; the low-viscosity solvent comprises at least one of glycol dimethyl ether, diethylene glycol dimethyl ether, ethylene glycol methyl ether, 1,3-dioxolame, tetrahydrofuran, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate and propyl propionate; and the viscosity of the low-viscosity solvent is less than 1mPa.s. The invention further relates to the primary lithium battery. The non-aqueous electrolyte of the primary lithium battery provided by the invention has the advantages of high safety performance, good high-temperature storage performance and low-temperature discharge performance.

The invention discloses a high-performance nano colloid power battery. The battery comprises an anode plate, a cathode plate, a positive column, a negative column, a separation membrane, electrolyte and a battery shell, and the electrolyte is prepared from the following raw materials, in parts by weight: 180-200 parts of dilute sulphuric acid with the concentration being 47-52%, 4-5 parts of nanofumed silica, 0.02-0.05 part of polyacrylamide, 0.02-0.05 part of polyvinyl alcohol, 0.02-0.05 part of alpha-naphthol acid and 40-50 parts of pure water, wherein the grain size of the nano fumed silica is 7-40nm, and the specific surface area is 175-225m/g. Compared with the prior art, the high-performance nano colloid power battery has the comprehensive properties of being long in service life and high in current discharge, and solves the problems that an existing power battery is insufficient in property and the low temperature starting capability is poor.

The invention provides a nickel-metal hydride battery positive electrode powder material. The nickel-metal hydride battery positive electrode powder material is composed of the following components in percentage by mass: 35%-60% of spherical Ni(OH)2, 35%-62% of cobalt-cladded spherical Ni(OH)2, 2.5%-6% of CoO powder and 0.5%-1.0% of a binding agent; and the sum of the mass percents of all the components is 100%. Meanwhile, the invention further provides a preparation method of a nickel-metal hydride battery. The nickel-metal hydride battery prepared by the preparation method has good low-temperature discharging performance, high discharging efficiency and low self discharge.

A surface treatment method of hydrogen-storage alloy powder comprises the following steps of: oxidizing hydrogen-storage alloy powder, and contacting with an alkali solution, wherein the mixture of the hydrogen-storage alloy powder and a cobaltous salt solution is contacted with hypophosphite. A battery prepared from the hydrogen-storage alloy powder processed by the invention has good low-temperature discharge performance and large-current discharge performance.

The present invention provides a secondary battery and an electrochemical energy storage device. The secondary battery comprises a positive electrode, a negative electrode and an electrolyte, wherein a material of the negative electrode is graphite, the primary particle diameter of the graphite is less than 1 [mu] m, and a solvent in the electrolyte is a non-aqueous organic solvent containing propylene carbonate; the secondary battery provided by the invention has good normal-temperature cycle performance, high-temperature cycle performance and good low-temperature discharge performance.