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 belongs to the technical field of a lithium ion battery, and specifically relates to a high-energy-density ternary NCA battery and a preparation method therefor. The high-energy-density ternary NCA battery comprises a positive electrode material, a negative electrode material and an electrolyte; and the preparation method for the high-energy-density ternary NCA battery comprises the following steps of 1) preparation of a positive plate; 2) preparation of a negative plate; 3) preparation of the electrolyte; and 4) preparation of a finished battery. By virtue of improvement on the negative electrode material, the coating uniformity and density are improved without causing partial crack in circulation, generation of a new surface is suppressed, side reaction is reduced, generation of a new SEI film is reduced, and effective utilization ratio of silicon is improved; by matching with the ternary NCA positive electrode material, the material structure can be stabilized, and the normal-temperature cycling performance, the high-temperature cycling performance and the thermal stability can be improved; and meanwhile, the electrolyte is added with a positive electrode surface protecting agent, a lithium hexafluorophosphate stabilizing agent and a negative electrode SEI film forming additive, thereby improving the safety and prolonging the high-temperature cycle life of the 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 relates to a long-circulation non-aqueous electrolyte battery. The long-circulation non-aqueous electrolyte battery comprises a cell and a shape memory polymer material which tightly coats the outer surface of the cell. The shape memory polymer material is introduced to the non-aqueous electrolyte battery; the shape memory polymer material tightly coats the outer surface of the cell, so that shrinkage at a high temperate can be generated to tightly press a diaphragm and an electrode plate to maintain high contact between the diaphragm and the electrode plate; and therefore, the cycle life of the battery can be effectively prolonged, and particularly, the cycle life can be obviously prolonged at a high temperature. The invention further provides a preparation method for the long-circulation non-aqueous electrolyte battery. The preparation method provided by the invention has no limitation on selection of a battery material system, and has high universality; and in addition, the operation process can be implemented simply and easily, so that the preparation method is applicable to industrial scale production and has wide application prospect.

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 provides a positive pole material for a lithium ion battery. The positive pole material comprises positive pole active substances, a conductive agent and a binding agent, wherein the positive pole active substances comprise lithium cobalt oxide and lithium manganate; and the relative intensity of a 311 peak in an XRD spectrum of the lithium manganate is less than 60 percent. The invention also provides a positive pole for the lithium ion battery by using the positive pole material and a lithium ion battery comprising the positive pole. Because the positive pole material comprisesthe lithium manganate of which the relative intensity of the 311 peak in the XRD spectrum of the lithium manganate is less than 60 percent, the usage amount of the lithium manganate can be up to 60 weight percent of the total weight of the positive pole active substances so as to greatly reduce the manufacturing cost of a battery and improve high-temperature performance of the battery. Simultaneously, the lithium ion battery comprising the lithium ion battery positive pole material has the advantage of long high-temperature cycle life.

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 belongs to the technical field of lithium ion batteries, and specifically relates to a high-energy-density ternary NCA battery and a preparation method thereof; the high-energy-density ternary NCA battery includes a positive electrode material, a negative electrode material and an electrolyte, and the high-energy The preparation method of the density ternary NCA battery includes the following steps: 1) preparation of the positive electrode sheet; 2) preparation of the negative electrode sheet; 3) preparation of the electrolyte; 4) production of the finished battery; the improvement of the negative electrode material will increase the coating uniformity High quality and high density, will not cause local cracks in the cycle, inhibit the appearance of new surfaces, reduce side reactions, reduce the formation of new SEI films, improve the effective use of silicon, and achieve a stable material structure with ternary NCA cathode materials , improve its normal temperature, high temperature cycle performance and thermal stability; at the same time, add positive electrode surface protection agent, lithium hexafluorophosphate stabilizer and negative electrode SEI film forming additive to the electrolyte to improve battery safety and high temperature cycle life.

The invention discloses an exhaust valve head material having excellent high-temperature strength and a preparation method thereof. Alloy components of the exhaust valve head material having excellent high-temperature strength comprise 0.32-0.40wt% of C, 0.17-0.37wt% of Si, 1.0-2.0wt% of Mo, 6.5-8.0wt% of Mn, 20-22wt% of Cr, 0.50-1.0wt% of W, 1.5-2.5wt% of Ni, 0.50-1.0wt% of Nb, less than or equal to 0.015wt% of P, less than or equal to 0.015wt% of S, less than or equal to 0.010wt% of Cu and the balance Fe. The exhaust valve head material is prepared by low-pressure casting, rolling and heat treatment. The exhaust valve head material has the advantages of good heat resistance, good heat stability, high high-temperature strength and long service life.

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 Ce-containing exhaust valve head material and a preparation method thereof. The Ce-containing exhaust valve head material comprises the following alloying components in percentage by weight: 0.32-0.40% of C, 0.17-0.37% of Si, 1.0-2.0% of Mo, 6.5-8.0% of Mn, 15-18% of Cr, 0.50-1.0% of W, 1.5-2.5% of Ni, 0.50-1.0% of Ce, at most 0.015 of P, at most 0.015 of S, at most 0.010% of Cu and the balance of Fe. The valve material is prepared by low-pressure casting, rolling and heat treatment. The valve head material has the advantages of excellent heat resistance, high heat stability, high high-temperature strength and long service life.

The invention discloses a high-temperature-storage-resistant oil-based lithium ion battery diaphragm and anpreparation method thereof. The preparation method comprises the following steps: uniformly stirring an organic solvent and PVDF (Polyvinylidene Fluoride), adding a water removal additive, uniformly stirring, adding a high-temperature film-forming agent, uniformly stirring, adding an optimizing agent, and uniformly stirring to obtain high-temperature-storage-resistant diaphragm slurry, the organic solvent being one or a mixture of more of DMAC, DMF and acetone, the dewatering additive being alkyl phosphoric anhydride, the high-temperature film-forming agent being methylene methanedisulfonate and / or 4-methyl ethylene sulfite, and the optimizing agent being fluoroborate. The method for preparing the oil-based lithium ion battery diaphragm comprises the following steps: coating one surface of a base membrane with the high-temperature-resistant storage diaphragm slurry, extracting and drying to obtain the oil-based lithium ion battery diaphragm. The high-temperature film-forming agent and the optimizing agent supplement each other, the dynamic stability of the SEI film is promoted, and the water removal effect of acid anhydride is matched, so that the super-strong high-temperature-resistant storage performance of the lithium battery is ensured.

The application discloses an electrolytic solution and a lithium ion battery using the same. In the present application, the electrolyte includes a non-aqueous solvent, lithium salt and additives, the additives include the compound represented by formula I, the non-aqueous solvent includes the compound represented by formula II and the compound represented by formula III, the compound represented by formula II and the compound represented by formula The mass ratio of the compounds represented by III is 1:1 to 1:5. The electrolyte described in the application has better compatibility with the lithium-ion battery of the ternary positive electrode system, which is beneficial to reduce the interfacial impedance of the lithium-ion battery, especially the cycle process of the ternary lithium-ion battery, and reduce gas production, thereby improving the performance of the battery. High temperature cycle life and high and low temperature storage capacity retention rate reduce volume expansion during high temperature storage.

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 application discloses an electrolytic solution and a lithium ion battery using the same. In the present application, a kind of electrolytic solution is provided, including the compound represented by formula I, additive, lithium salt and non-aqueous solvent; The electrolytic solution of the present invention is beneficial to reduce the The interfacial impedance reduces gas production, thereby improving the high-temperature cycle life and high-temperature storage capacity retention and recovery rate of lithium-ion batteries, improving the low-temperature discharge retention rate, and reducing volume expansion during high-temperature storage.

The invention discloses an electrolyte and a lithium ion battery. The electrolyte comprises a non-aqueous solvent, a lithium salt and an additive, wherein the lithium salt comprises a compound represented by a formula I shown in the description; and the non-aqueous solvent comprises a compound represented by a formula II shown in the description and a compound represented by a formula III shown inthe description, and the mass ratio of the compound represented by the formula II to the compound represented by the formula III ranges from 1: 1 to 1: 5. The electrolyte disclosed by the invention is relatively high in conductivity and is beneficial to lithium ion conduction; and the lithium ion battery containing the electrolyte has longer high-temperature cycle life, higher high-temperature storage capacity retention rate, higher high-temperature storage capacity recovery rate and lower high-temperature storage volume expansion.

The present invention relates to a non-aqueous electrolyte. The non-aqueous electrolyte comprises a lithium salt and an organic solvent; the organic solvent comprises a cyanogen organic silicon compound and other organic solvents; and the mass of the cyanogen organic silicon compound is 50-100% of the total mass of the organic solvent; the other organic solvents are carbonic ester and / or cyanogenorganic solvents. The electrolyte prepared by taking the cyanogen organic silicon compound as a main solvent or a cosolvent has excellent thermal stability; the high-temperature cycle life of a lithium ion battery is obviously prolonged; the swelling of the lithium ion battery is reduced at high temperature; the flame retardance of the electrolyte is fully exerted; the flash point of the non-aqueous electrolyte solution is increased, so that the safety performance of the non-aqueous electrolyte solution is improved; and the failure rate of the battery is reduced better, so that the commercialapplication requirements of the battery can be met.

The invention provides a negative electrode formula for improving the high-temperature performance of a lead-acid storage battery. The negative electrode formula comprises the following components in parts by weight: 100 parts of lead powder, 8-11 parts of dilute sulphuric acid, 9-13 parts of deionized water, 0.06-0.14 part of short fibers, 0.10-0.20 part of lignin, 0.3-0.45 part of humic acid, 0.05-0.1 part of a synthetic tanning agent, 0.8-1.2 parts of barium sulfate, 0.10-0.15 part of carbon black, 0.04-0.08 part of high-conductivity graphite, 0.08-0.15 part of a first hydrogen evolution inhibitor and 0.05-0.1 part of a second hydrogen evolution inhibitor. The method has the advantages that the mixture of the hydrogen evolution inhibitor and the humic acid is added into the formula of the negative electrode lead paste, and a certain proportion of humic acid is added into the negative electrode of a lead-acid battery, so that the sulfation phenomenon of the negative electrode can be effectively relieved; and the hydrogen evolution inhibitor of the hydrogen evolution overpotential and humic acid are compounded and then added into a negative plate of the lead-acid battery, so that the hydrogen evolution of the negative plate of the lead-acid battery is inhibited, the water loss rate is reduced, and the high-temperature cycle life of the battery is effectively prolonged.

The invention discloses an exhaust valve head material and a preparation method thereof. The exhaust valve head material comprises the following alloying components in percentage by weight: 0.32-0.40% of C, 0.17-0.37% of Si, 2.0-3.0% of Mo, 6.5-8.0% of Mn, 20-22% of Cr, 0.50-1.0% of W, 2.5-3.5% of Ni, at most 0.015 of P, at most 0.015 of S, at most 0.010% of Cu and the balance of Fe. The valve material is prepared by low-pressure casting, rolling and heat treatment. The exhaust valve head material has the advantages of high heat resistance, high heat stability, high high-temperature fatigue strength and long service life.

The invention provides a temperature-controlled and pressure-controlled formation method of a lithium-ion battery, which includes injecting liquid and forming the assembled battery under controlled temperature and pressure. The temperature-controlled and pressure-controlled formation method includes low-pressure formation and normal temperature formation. As well as multi-stage formation processes such as high-temperature formation, the lithium-ion battery obtained through the method has good cycle life and high-temperature stability.

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.

The invention discloses an exhaust valve head material containing the Ce and a preparation method thereof. The alloy comprises alloy components in percentage, by weight, 0.32-0.40% of C; 0.17-0.37% ofSi; 1.0-2.0% of Mo, 6.5-8.0% of Mn; 15-18 % of Cr, 0.50-1.0% of W; 1.5-2.5% of Ni; 0.50-1.0% of Ce; less than or equal to 0.015 of P; less than or equal to 0.015 of S; less than or equal to 0.010% ofCu; and the balance of Fe; and the valve material is formed by low-pressure casting, rolling and heat treatment. According to the reparation method of the exhaust valve head material containing the Ce, the valve head material has the advantages of excellent heat resistance and good heat stability, and is especially high in high-temperature strength and long in service life.