34results about How to "Improve high temperature cycle life" patented technology

The invention provides a temperature controlled and pressure controlled formation method of a lithium ion battery. The method comprises the step of performing a liquid injection and formation method on an assembled battery under the condition of controlling the temperature and pressure. The temperature controlled and pressure controlled formation method comprises multi-stage formation technologiesof low pressure formation, normal temperature formation and high temperature formation. The lithium ion battery acquired by the method is good in cycling life and high temperature stability.

The invention provides a cobalt-free positive electrode material and a preparation method thereof. The cobalt-free positive electrode material comprises an inner core and a shell coating the inner core, the inner core is doped cobalt-free positive electrode particles, and the shell comprises a dopant; and the cobalt-free positive electrode material is subjected to infrared spectroscopic analysis, the peak area of a wave crest formed at the position of 520-620 cm<-1> is recorded as X, the peak area of a wave crest formed at the position of 800-900 cm<-1> is recorded as Y, and Y/X is larger than or equal to 0.010 and smaller than or equal to 0.035. Intercrystalline microcracks are reduced by optimizing doping, surface residual alkaline substances are reduced while the interface stability of the material is improved by coating, generation of gas is effectively inhibited, and the failure risk of the battery is further reduced.

The invention discloses a storage battery anode lead plaster capable of enhancing SAE standard high temperature service life and a preparation method, aiming at solving the problem of high temperature service life of lead-acid storage batteries. The technical scheme is that the lead plaster raw materials are prepared by the following substances in parts by weight: 100 of lead powder, 0.05-0.1 of fiber, 0.1-1.0 of superfine barium sulfate, 0.05-0.2 of carbon black, and 0.1-0.4 of magnesium sulfate. The invention selects superfine barium sulfate as anode additive, thus delaying contraction and rigidification of anode plate under high temperature and prolonging service life of the storage battery; magnesium sulfate and carbon black improve the porosity of the anode active substance, facilitates dispersion of sulfuric acid and is beneficial for starting performance of the storage battery. Proved by test data, main technical performance index can perfectly achieve and surpass the standard requirement, and satisfy the requirement of the automobile on the high temperature service life of the storage battery.

The invention discloses an electrolyte additive for improving high-temperature flatulence of a battery, and relates to the technical field of lithium ion batteries, the additive comprises a 1,3-diphosphate-isothiazole compound and a water removal additive. The structural general formula of the 1,3-diphosphate-isothiazole compound is shown in the specification, wherein R1 and R2 are respectively and independently selected from one of H, C1-8 alkyl, C4-10 cycloalkyl, C2-10 alkenyl, C2-10 alkynyl, C6-16 aryl, C6-16 heteroaryl and part of fluoro or perfluoro compounds of the H, the C1-8 alkyl, the C4-10 cycloalkyl, the C2-10 alkenyl, the C2-10 alkynyl, the C6-16 heteroaryl and the part of fluoro or perfluoro compounds of the C6-16 heteroaryl. The invention also provides an electrolyte containing the additive and a lithium ion battery. The electrolyte has the beneficial effects that the special high-temperature gas expansion improving additive is added into the electrolyte, so that the reaction between the electrolyte and positive and negative electrode materials in the lithium ion battery under a high-temperature condition is inhibited, the stability of the positive and negative electrode materials under a high-temperature environment is improved, and the storage gas expansion and cycle performance of the battery under the high-temperature condition is improved.

The invention discloses a multifunctional composite negative plate for a rechargeable solid battery. The multifunctional composite negative plate comprises a negative electrode current collector layer, a negative electrode ion conduction electronic insulation layer and a negative electrode active material layer positioned between the negative electrode current collector layer and the negative electrode ion conduction electronic insulation layer. The negative electrode active material layer is composed of a plurality of negative electrode active material assemblies. The plurality of negative electrode active material assemblies are distributed in a two-dimensional laminated structure or a three-dimensional laminated structure. Different functions of different negative electrode active material assemblies are fully exerted. Comprehensive performance of the battery is considered. The negative ion conduction electronic insulation layer can realize ion conduction and electronic insulation functions. The introduction of a liquid electrolyte and internal short-circuit self-discharge are avoided. The safety of the battery is improved. The multifunctional composite negative plate and the secondary battery which have comprehensive excellent properties such as energy density, safety, rate capability, high and low temperature characteristics, service life, cycle life and the like are obtained.

The invention discloses a multifunctional composite negative plate and a preparation method thereof, and a secondary battery. The multifunctional composite negative plate comprises a negative currentcollector layer and a negative active material layer. The negative electrode active material layer comprises a plurality of negative electrode active material assemblies. The negative electrode activematerial assemblies are prepared from a negative electrode material, a binder and a conductive additive, the plurality of negative electrode active material assemblies are distributed between the negative electrode current collector layer and the diaphragm in a two-dimensional laminated structure or a three-dimensional laminated structure, and the plurality of negative electrode active material assemblies have different physical properties or different chemical compositions. According to the invention, structural design is performed on the negative electrode active material layer, the multifunctional composite negative plate and the secondary battery give full play to the functions of different negative active material assemblies, the defects of single negative active material layer structure and short function in the prior art are overcome, and give consideration to the comprehensive excellent performances such as safety, rate capability, high and low temperature characteristics, service life, cycle life and the like.

The invention relates to a positive electrode lead paste for prolonging the high-temperature cycle life of a lead-acid battery and a preparation method thereof. The utility model belongs to the technical field of starting lead-acid batteries. It mainly solves the problem that the cycle life of SAE J2801 lead-acid battery is less than 15 units. The invention has main characteristics : a positive lead paste formula: lead powder comprising 78.2%-80.2%; Red Dan 2.6%-2.7%; Staple fiber 0.05%-0.06%; 0.09%-1.00% organic binder; 0.02% 0.05% Interface improver; 7.0%- 7.5%dilute sulfuric acid; 10.0%-10.5%Pure water. The invention has the characteristics of reducing the water loss rate, reducing the positive grid corrosion rate and the number of SAE J2801 cycle life test units under high-temperature environment being more than 15 units, and is mainly used for starting lead acid battery to prolong its high-temperature cycle life.

The invention discloses an iron-based layered oxide positive active material as well as a preparation method and application thereof. The iron-based layered oxide positive electrode active material comprises an iron-based layered oxide NaFexM1yO2, the NaFexM1yO2 comprises a doping element M2 and a doping element Re, wherein x is greater than y, M1 is selected from at least one of Ni, Mn, Cu and Co, the doping element M2 is selected from at least one of Mg, Al, Ti and Zr, and the doping element Re is selected from at least one of rare earth elements. The Fe element is used as a reference element, and is matched with a proper amount of substitution element M1 and doping elements M2 and Re, so that the structural stability of the electrode material in the working process, especially in the working process under a high-temperature condition, can be effectively maintained, and the cycle life, particularly the high-temperature cycle life, of the material is greatly prolonged on the premise of not influencing the multiplying power .

The invention provides a formation method of a power lithium ion battery in a high-temperature environment, a positive electrode active substance of the lithium ion battery is a manganese-based transition metal lithium oxide, an electrolyte comprises an organic solvent and an additive, and the solvent is composed of ethylene carbonate and propylene carbonate; the additive is prepared from 1, 3-propylene sultone, vinylene carbonate and ethylene sulfate, and the volume ratio of the 1, 3-propylene sultone to the vinylene carbonate to the ethylene sulfate is (1 to 1.5) to (0.6 to 0.8) to (1.8 to 2.0). The formation method comprises the following steps: carrying out pre-charging in a voltage range not higher than a first preset voltage, and carrying out pulse charging in a voltage range not lower than a second preset voltage. The cycle life of the lithium ion battery obtained by the method in a high-temperature environment is greatly prolonged.

The invention discloses an electrolyte and a lithium ion battery using the same. The invention provides an electrolyte, which comprises a compound represented by a formula I in the description, an additive, a lithium salt and a non-aqueous solvent. The electrolyte disclosed by the invention is beneficial to reducing the interface impedance of the lithium ion battery, particularly a ternary lithiumion battery in the cycle process and reducing gas production, so that the high-temperature cycle life of the lithium ion battery is prolonged, the high-temperature storage capacity retention and recovery rate is increased, the low-temperature discharge retention rate is increased, and the volume expansion during high-temperature storage is reduced.

The invention provides a modified lithium-ion battery cathode material. The cathode material is coated with a nano-additive. The invention also provides a method for preparing the modified lithium-ionbattery cathode material. According to the method, a silicon-containing nano-compound is added into a cathode material body, so that the surface of the lithium-ion battery cathode material is coatedwith the silicon-containing nano-compound, the interaction among particles of the lithium-ion battery cathode material is blocked, the liquidity of the lithium-ion battery cathode material is increased, and meanwhile, the electrochemical performance of the lithium-ion battery cathode material is improved.

The invention discloses a method for improving the stability of an SEI membrane of a lithium ion battery. The method comprises the following steps: S1, firstly, keeping a lithium ion battery cell, an electrolyte solvent and an electrolyte added with a lithium salt and a VC stabilizer at a constant temperature for later use; S2, weighing the lithium ion battery cell, and putting the battery cell into a vacuum system with the vacuum degree of -0.08 to -0.1 Mpa; S3, injecting the electrolyte into the battery cell which is kept in vacuum, and standing for 10 seconds; s4, breaking vacuum, and filling inert gas for pressurization; s5, vacuumizing again, the vacuum keeping time being 95 s, and continuously conducting the operation for three cycles; and S6, calculating the actual liquid absorption amount m'' of the battery, wherein m''=m'-m. The method has the advantages that the addition of the VC additive is beneficial to improving the discharge platform of the lithium ion battery, and when the content of VC is 1%, the improvement is most obvious, and the retention rate of the battery capacity is optimal at the moment. In addition, due to the addition of VC, the high-temperature cycle life of the lithium ion battery is remarkably prolonged, and the low-temperature discharge performance and the low-temperature capacity retention rate also reach the optimal level.

The invention relates to the technical field of lithium battery positive electrode materials, in particular to a lithium-rich manganese-based material and an application method thereof. The method comprises the following steps: S1, preparing materials: preparing, in parts by weight, a plurality of sulfates of nickel, manganese and cobalt, 20-50 parts of a hydrochloric acid solution, 30-60 parts of ammonia water and 20-40 parts of a sodium hydroxide solution; s2, dissolving: taking 20-50 parts of the hydrochloric acid solution in the S1, dissolving sulfates of nickel, manganese and cobalt in the hydrochloric acid solution according to the molar ratio of (0.35-0.5): (0.6-0.8): (0.05-0.1), slowly adding a sodium hydroxide solution under the condition of stirring, and continuously adding the sodium hydroxide solution after precipitates are generated until the precipitates are not increased any more to form a solid-liquid mixture; s3, PH adjustment: slowly adding ammonia water into the solid-liquid mixture in the S2, and stirring until the PH of the solid-liquid mixture is in a range of 8-9. Lithium-rich manganese and spinel lithium manganate are jointly used as the positive electrode material of the lithium ion battery so that the problem that the voltage of the lithium-rich manganese material is continuously reduced in the circulating process is solved, and the lithium battery is stable and reliable.