45results about How to "Good discharge performance at low temperature" patented technology

A low-temperature high-energy-density lithium iron phosphate battery, the mass percentage of each solid substance in the positive electrode is: coated nano-scale lithium iron phosphate: 93.0% to 95.5%; polyvinylidene fluoride: 3.5% to 7.3%; oily carbon nanotubes : 1.0% to 2.0%; the mass percentage of each solid substance in the negative electrode is: porous silicon carbon: 90.0% to 93.5%; sodium carboxymethyl cellulose: 1.5% to 3.0%; binder: 3.0% to 6.0%; SP type Conductive carbon black: 0.5% to 1.2%; C 45 Type conductive carbon black: 0.5% to 1.5%; KS‑6 type conductive graphite: 1.0% to 2.0%. The high-energy-density lithium iron phosphate battery provided by the present invention has good low-temperature discharge performance, and the discharge capacity at -40°C is more than 75% of the room temperature discharge capacity, which can meet the use of small electric tools, aviation, aerospace and new energy vehicles in cold regions Require.

The invention provides a lithium ion secondary battery as well as electrolyte thereof. The electrolyte of the lithium ion secondary battery comprises lithium salt, non-aqueous organic solvents and additives, wherein the additives comprise a first additive and a second additive; the first additive is 1, 3-propane suhone (PS), and the second additive is 4-methylene-1, 3-dioxolane-2-ketone and derivatives thereof with a structural formula 1 as shown in the specification and / or 4, 5-dimethylene-1, 3-methylene-2-ketone as well as derivatives thereof with a structural formula 2 as shown in the specification; in the structural formula 1 and the structural formula 2, R1, R2, R3 and R4 are respectively nitrogen, halogen, C1-C3 alkyl group or halogenated alkyl group; the first additive accounts for 0.3-4.0 percent by mass of the electrolyte of the lithium ion secondary battery, and the second additive accounts for 0.3-4.0 percent by mass of the electrolyte of the lithium ion secondary battery. The lithium ion secondary battery comprises the electrolyte. The lithium ion secondary battery provided by the invention has a favorable low-temperature electric discharge performance.

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 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 belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery that can be discharged at ultra-low temperatures, including a positive electrode sheet, a negative electrode sheet, a separator spaced between the positive electrode sheet and the negative electrode sheet, and an electrolyte thereof. The electrolytic solution includes, by mass percentage, 5%-10% of lithium salt, 85%-94% of solvent and 1-10% of additive, and the additive is three-arm polyethylene carbonate. In the present invention, the three-arm polyvinyl carbonate additive obtained by the cycloaddition reaction of VC, PS and VEC solvents is added to the electrolyte. Since the additive has a VC ring group, it can form polymerized alkylene on the surface of the graphite negative electrode. The base lithium carbonate film can effectively avoid the side reaction between the electrolyte and the negative electrode; at the same time, the addition reaction of the VEC double bond can effectively inhibit the decomposition and co-embedding of PC on the graphite negative electrode, thus improving the cycle performance of the battery. The high and low temperature resistance performance of the battery.