183 results about "High temperature storage" patented technology

The invention relates to the technical field of batteries, in particular to a lithium ion secondary battery. Comprising a positive plate, the positive plate comprises a positive current collector and a positive active layer arranged on at least one side surface of the positive current collector, the positive active layer comprises a positive active material, and the positive active material comprises lithium manganese iron phosphate and a ternary positive material; the lithium manganese iron phosphate is Li < y > Mn < x > Fe < w > M < 1 > z > PO4, and the ternary positive electrode material is Li Ni Co < c > Mn < d > M < 2 > e O < 2 >; in the positive electrode active layer, the mass content of Fe element is c2; the lithium ion secondary battery also comprises an electrolyte, and the electrolyte comprises lithium difluorophosphate; and the mass contents c1 and c2 of the lithium difluorophosphate in the electrolyte meet: # imgabs0 #. According to the battery disclosed by the invention, the safety performance of the battery can be effectively improved, and meanwhile, the problem of gas production caused by high-temperature storage of the battery is solved.

The invention provides a positive pole piece and a preparation method thereof and a battery, the positive pole piece comprises a positive current collector and a positive material coated on the positive current collector, the positive material comprises a positive active material, a conductive agent, a liquid retaining agent and an adhesive, the liquid retaining agent comprises superfine fibers, the diameter of the superfine fibers is 400-900mm, and the superfine fibers are added, so that the conductivity of the positive pole piece is improved. The superfine fibers can be filled in the pores of the positive pole piece, and the pores inside the superfine fibers can absorb a large amount of electrolyte, so that the pores inside the superfine fibers are filled with the electrolyte, the electrolyte absorption and retention capabilities of the positive pole piece are greatly improved, and meanwhile, the free electrolyte is greatly reduced, so that the liquid loss after formation and degassing of the battery can be reduced, and the service life of the battery is prolonged. And the long-cycle capacity retention rate and the high-temperature storage capacity retention rate of the battery are improved.

The invention discloses a graphite material and a preparation method thereof, a negative plate, a battery and electric equipment, the graphite material comprises a graphite core and a coating layer, the graphite core is filled with a filler, the untreated graphite material has a rich pore structure and a large specific surface area, the specific surface area of the graphite material can be reduced by filling the filler, and the specific surface area of the graphite material can be reduced by filling the filler. The high-temperature performance of the graphite material is improved; meanwhile, the surface of the graphite core is coated with the coating layer, so that the cyclic expansion effect of the graphite material can be relieved, lithium ion transmission is facilitated, the diffusion energy barrier of lithium ions at low temperature is reduced, and internal pores and an external structure of the graphite material can be optimized by filling the graphite material core and coating the graphite material. The graphite material provided by the invention has excellent low-temperature rate performance, high-temperature storage performance and cycle performance, and can be applied under high-temperature and low-temperature working conditions.

A novel additive, an electrolyte, and a lithium ion battery, relating to the technical field of lithium ion batteries. The electrolyte comprises a lithium salt and a non-aqueous solvent for dissolving the lithium salt, the electrolyte further comprises an electrolyte additive, the electrolyte additive comprises a positive electrode film-forming additive and a negative electrode film-forming additive, and the electrolyte additive further comprises a fluoro isocyanate-based pyridazine organic compound. The additive can absorb moisture and hydrofluoric acid in the electrolyte, reduce the dissolution of transition metals, improve the thermal stability of lithium hexafluorophosphate, and maintains the stability of a ternary material under high voltage; a sulfuric acid group on the novel additive can be oxidized by oxygen at a positive electrode, so that the oxygen generated when an LFO lithium supplementing agent is activated is absorbed, the capacity exertion, high temperature cycle and high temperature storage of the LFO lithium supplementing agent are significantly improved, and the DCIR of the battery will not obviously increase, thereby improving the stability of the battery.

The invention relates to the technical field of lithium ion batteries, relates to a lithium ion battery, and particularly relates to a lithium ion battery with relatively good fast-charge cycle performance and high-temperature storage performance. The lithium ion battery comprises a positive plate, a negative plate and a non-aqueous electrolyte, the positive plate comprises a positive active material, and the positive active material comprises a phosphate compound; the non-aqueous electrolyte comprises a first additive, a lithium salt and a non-aqueous organic solvent; the lithium salt comprises lithium hexafluorophosphate and lithium bis (fluorosulfonyl) imide; the first additive comprises at least one of compounds 1-5, and the solvent comprises a compound as shown in a structural formula 1; the lithium ion battery satisfies the following conditions: 2.8 < = C / (10A + B) + D / 100 < = 14, 0.05 < = A < = 2, 0.5 < = B < = 6, 24 < = C < = 56, and 160 < = D < = 220. The lithium ion battery provided by the invention is high in energy density, and has relatively excellent high-temperature storage performance and fast-charge cycle performance.

The invention discloses a lithium manganese iron phosphate positive electrode material and a preparation method thereof, a positive electrode plate and a lithium ion battery, and relates to the technical field of lithium ion batteries. The lithium manganese iron phosphate positive electrode material comprises a lithium manganese iron phosphate inner core and a coating shell layer, the surface of the lithium manganese iron phosphate inner core is coated with the coating shell layer; the coating shell layer comprises lithium iron phosphate; the positive electrode material can solve the problem of poor high-temperature storage performance of the lithium manganese iron phosphate material, so that the lithium manganese iron phosphate material has high capacity and high-temperature storage stability.

The invention provides a non-aqueous electrolyte and a lithium ion battery containing the same, and belongs to the technical field of lithium ion batteries. The non-aqueous electrolyte comprises electrolyte salt, an organic solvent, a nitrile additive and a compound A; complementary construction of an interfacial film is achieved through the synergistic effect of the nitrile additive and fluorosilane, and decomposition of an electrolyte and corrosion of an electrode material are prevented; a lithium ion conduction path is optimized, and the charging and discharging efficiency of the battery in a high-temperature and high-pressure circulation process is improved; transition metal ion migration is inhibited, and the cycle performance at high temperature and high pressure is improved; gas and by-products generated by thermal decomposition are reduced, so that the volume expansion rate of the battery at high temperature and high pressure is reduced, and stable performance of the battery in a high-temperature cycle process is ensured; the volume expansion rate under high-temperature storage is reduced; and the capacity recovery rate is improved.

The invention provides an energy storage lithium ion battery high-temperature storage electrolyte additive, an electrolyte and a battery, and belongs to the technical field of lithium ion batteries, molecules of the electrolyte functional additive contain P = O groups, and oxygen atoms in the groups have high electronegativity and can generate complexation with transition metal ions. In the high-temperature storage process of the lithium ion battery, the complexing action can effectively inhibit the dissolution of transition metal ions and reduce a series of adverse effects caused by the dissolution of the transition metal ions, so that the self-discharge phenomenon of the battery during high-temperature storage is improved, and the high-temperature storage capacity retention rate is remarkably increased; and the performance of the battery in a high-temperature environment is improved fundamentally.

The invention relates to the technical field of batteries, in particular to a lithium ion secondary battery. Comprising a positive electrode plate, a negative electrode plate and an electrolyte, the positive electrode plate comprises lithium cobalt oxide, the negative electrode plate comprises a silicon-based material, the electrolyte comprises a fluorosulfonamide compound, a nitrile compound and a first solvent, the first solvent comprises at least one of fluoroether, fluorobenzene and acetic acid 2, 2-difluoroethyl ester, and by taking the total mass of the electrolyte as a standard, the total mass of the lithium cobalt oxide and the total mass of the nitrile compound are equal to or smaller than 1. The content c1 of the fluorosulfonamide compound and the content c2 of the nitrile compound meet the following condition: 0.1 < = c1 / c2 < = 30; and the charging cut-off voltage of the lithium ion battery is greater than or equal to 4.48 V. The lithium ion secondary battery disclosed by the invention has relatively high energy density, relatively good cycle performance, excellent high-temperature storage performance and relatively good low-temperature performance.

The present invention belongs to the technical field of batteries, and provides a negative electrode active material, a secondary battery, and an electronic device. The negative electrode active material comprises a silicon-based material and an outer layer material, wherein the outer layer material comprises a conductive agent and a nitrile polymer. The infrared spectrum of the negative electrode active material comprises infrared characteristic peaks of a cyano group. The negative electrode active material comprises nitrogen and silicon; and based on the mass of the negative electrode active material, the mass content of nitrogen is D1%, the mass content of silicon is G%, and 0.02≤D1 / G≤0.5. By forming the outer layer material comprising the conductive agent and the nitrile polymer on the surface of the silicon-based material, the conductivity and the stability of the negative electrode active material can be improved, such that the secondary battery has an excellent cycle capacity retention rate and expansion inhibition performance, and the high-temperature storage performance of the secondary battery can be further improved.

The negative electrode active material for lithium secondary battery of the present invention is composed of 50 The carbon-based primary particles are composed of synthetic graphite secondary particles assembled from carbon-based primary particles having an average particle size (D 50 ) is a particle group and the average particle size (D 50 ) is a particle group of b, and b<0.6a. The present invention has secondary particles assembled from carbon-based primary particles with different average particle sizes, thereby showing a sharply increased tap density and having the advantages of excellent negative electrode adhesion and high-temperature storage performance.

The present application discloses an organic electrolyte and a lithium-ion secondary battery, relating to the field of battery technology. The organic electrolyte comprises: lithium tetrafluorooxalate phosphate and an isocyanate compound; the isocyanate compound is selected from a mixture of one or more of a monoisocyanate compound, a diisocyanate compound, and a polyisocyanate compound; wherein the mass ratio of the lithium tetrafluorooxalate phosphate to the isocyanate compound is 2-5:1. The present application, by applying lithium tetrafluorooxalate phosphate and an isocyanate compound to an organic electrolyte, can form a more stable organic-inorganic composite modified SEI film at the negative electrode interface through binding, thereby effectively reducing direct contact between the organic solvent and the negative electrode interface, improving the reversibility of lithium ion insertion / deinsertion, thereby helping to improve the battery's cycle life characteristics, high temperature storage stability, and low temperature discharge capability.

In order to solve the problem that the existing electrolyte is difficult to give consideration to the high-temperature storage life and the improvement of the battery performance, the invention provides a non-aqueous electrolyte, the non-aqueous electrolyte comprises a non-aqueous organic solvent, an electrolyte salt, an additive and a stabilizer, the stabilizer comprises a compound as shown in a structural formula 1, and the additive comprises a compound as shown in a structural formula 2; in the structural formula 1, R1 is selected from C1-C5 halogenated alkyl; in the structural formula 2, n is 0 or 1, and R2 is selected from H, halogen, C1-C3 alkyl or C1-C3 halogenated alkyl. The invention also provides a secondary battery comprising the non-aqueous electrolyte. The non-aqueous electrolyte provided by the invention has a relatively long high-temperature storage life on the basis of improving the electrochemical performance of the secondary battery.

Provided is a nonaqueous electrolyte secondary battery which has a high capacity retention rate after high-temperature storage, a suppressed amount of stored gas after high-temperature storage, low resistance after high-temperature storage, little elution of metal from a positive electrode, and low calorific value at high temperatures. A non-aqueous electrolyte secondary battery provided with a positive electrode having a positive electrode active material capable of intercalating and deintercalating metal ions, a negative electrode having a negative electrode active material capable of intercalating and deintercalating metal ions, and a non-aqueous electrolyte, the positive electrode active material containing a lithium transition metal compound, the positive electrode active material containing at least Ni, Mn, and Co, the molar ratio of Mn / (Ni + Mn + Co) is greater than 0 and 0.32 or less, the molar ratio of Ni / (Ni + Mn + Co) is 0.45 or more, the plate density of the positive electrode is 3.0 g / cm3 or more, and the non-aqueous electrolyte solution contains a monofluorophosphate and / or a difluorophosphate.

Disclosed are an electrolyte and a battery including the electrolyte, the electrolyte includes a solvent, a lithium salt and an additive. The solvent is constituted by a fluorinated solvent, the fluorinated solvent includes fluorinated ethylene carbonate (FEC), and the additive includes diethyl 2-(thiophene methyl)phosphonate (DTYP). The content of DTYP is 0.01% to 1.2% based on the total mass of the electrolyte. The electrolyte of the present disclosure, on basis of using fluorinated solvent as solvent to provide the battery with good high voltage performance, also through the synergistic effect of FEC and DTYP with specific content, forms SEI and CEI films with excellent thermal stability at the positive and negative electrode interfaces, thus enabling the battery to have both good high-temperature storage performance and high-temperature cycling performance.

This invention relates to an electrolyte for lithium-ion batteries or lithium metal batteries, a method for preparing the electrolyte, and a lithium battery. The electrolyte comprises a lithium salt, an organic solvent, and functional additives, wherein the functional additives include aluminum alkoxide compounds. A battery containing the additives is also provided. Based on the discovery that ethylene carbonate (EC) degrades battery thermal safety under high-temperature thermal abuse conditions, aluminum isopropoxide is innovatively introduced as a functional additive. This additive is stable at room temperature, but under high-temperature thermal abuse scenarios, it can act as a Lewis acid catalyst, specifically catalyzing the ring-opening polymerization reaction of EC in the electrolyte to generate polymer segments. Compared with existing technologies, the electrolyte provided by this invention effectively improves the high-temperature storage performance and thermal shock resistance of the battery without sacrificing its room-temperature electrochemical performance.

The utility model discloses a storage rack for lubricating oil production, which comprises a magnetic adsorption placing rack and a storage placing support plate, the storage placing support plate is connected to the front end of the magnetic adsorption placing rack, and a lubricating oil storage iron bucket is arranged at the upper end of the storage placing support plate. A lubricating oil storage iron bucket is placed on a storage placement supporting plate of the magnetic adsorption placement rack and then is magnetized and adsorbed by a non-magnetic adsorption plate of the magnetic adsorption placement rack, so that the lubricating oil storage iron bucket is prevented from moving randomly, and the lubricating oil storage iron bucket is safer to place; the medium storage and conveying mechanism can convey a cooling water source into the storage and placement supporting plate through a medium input pipeline, so that heat of the storage and placement supporting plate is taken away, and lubricating oil deterioration caused by high temperature of the lubricating oil storage iron drum is avoided; and the medium output pipeline can recover the heat medium into the medium storage and conveying mechanism through the medium output pipeline to be recovered and cooled, so that a cooling cycle is formed.

The invention discloses a ternary lithium ion battery electrolyte and an application thereof. The ternary lithium ion battery electrolyte comprises a lithium salt, an ester solvent and an additive, the additives comprise an additive I and an additive II; the additive I is formed by introducing-CH3,-CH3O,-COOH,-CF3,-F and isomers thereof on a molecular structure of 1, 3-propane sultone. And the SEI film formed at the negative electrode contains more organic sulfides and fluorides, so that the interface impedance of the negative electrode is reduced, and Li < + > transmission at low temperature is facilitated. Meanwhile, more inorganic sulfides are formed in the CEI film on the positive electrode, so that the side reaction of an electrode / electrolyte interface at high temperature can be inhibited, and the high-temperature storage performance of the battery can be remarkably improved. And finally, the battery has relatively good high and low temperature performance.

An electrolyte solution of a lithium-ion battery and a lithium secondary battery. The electrolyte solution of a lithium-ion battery includes an organic solvent, a lithium salt and an additive, wherein the organic solvent includes fluorinated ethylene carbonate accounting for at least 5% of the total mass of the electrolyte solution, the additive comprises an additive A containing one or more compounds which have three or more carbon-carbon double bonds, and the electrolyte solution does not include a compound containing a sulfonyl group. The electrolyte solution of a lithium-ion battery is not only more environmentally friendly, but can also improve the swelling of the battery during the formation and high-temperature storage thereof, the discharge capacity of the battery, and the self-discharge performance of the battery under a high voltage.

The invention discloses a graphite material and a preparation method thereof, a pole piece and a battery. The specific surface area (BET), roundness, solid density and tap density of the graphite material meet the following conditions: (1.4-BET) * (1-roundness * solid density) is greater than or equal to 0 and less than or equal to 5; and 5.9 < 25 / (tap density + 5 * roundness * solid density) < 8.3. When the graphite material is applied to a battery, the graphite material has excellent high-temperature storage performance and high-temperature cycle performance.

A secondary battery and a preparation method therefor, and an electric apparatus. The secondary battery comprises a positive electrode plate, which positive electrode plate comprises a positive electrode current collector and a positive electrode film layer provided on at least one surface of the positive electrode current collector, wherein the positive electrode film layer comprises a positive electrode active material and a material containing a chalcogen element. The secondary battery and an electric apparatus including the secondary battery have improved cycle performance and high-temperature storage performance.

The present application provides a secondary battery. The secondary battery comprises a positive pole piece, a negative pole piece, a diaphragm and an electrolyte, the positive pole piece comprises a positive active material, the positive active material comprises LiMnaFe1-aPO4, a is greater than 0 and less than 1, the electrolyte comprises an additive A and an additive B, the additive A is selected from a compound shown in a formula I, and the additive B is selected from a compound shown in a formula II; and the additive B is selected from at least one of vinylene carbonate, fluoroethylene carbonate and vinylethylene carbonate. The additive A and the additive B are combined and applied to a lithium manganese iron phosphate system, so that a secondary battery has relatively low initial impedance and excellent normal-temperature cycle performance, high-temperature storage performance and high-temperature cycle performance, and transition metal ion deposition in a positive electrode material can be obviously reduced. # imgabs0 #

The invention relates to the technical field of batteries, in particular to a lithium supplement agent and a preparation method thereof, a positive pole piece and a lithium ion battery. The lithium supplementing agent comprises an inner core, the inner core comprises Li5Fe1-aMaO4-bXb, M comprises one or more of aluminum, titanium, zirconium, vanadium, manganese, cerium, calcium, copper, magnesium, niobium and zinc, X comprises one or more of nitrogen, fluorine, phosphorus, sulfur, chlorine, selenium, bromine and iodine, a is more than 0.005 and less than 0.05, b is more than 0 and less than 1, and a is more than 0 and less than 1; the carbon coating layer is arranged on at least part of the surface of the inner core. Compared with the prior art, through an anion bulk phase doping and coating strategy, the charge gram capacity which can be exerted by the lithium supplement agent is improved, the energy density is improved, meanwhile, the unit cell stability is improved, the decomposition voltage is reduced, electrolyte decomposition is inhibited, the air stability is improved, and the high-temperature storage gas production rate is remarkably reduced; the long-term storage performance and the safety performance of the battery are further improved, and the application cost and the maintenance cost are reduced.

The present invention relates to an electrolyte for a full-climate battery with a high-nickel cathode material, which solves the problems that lithium-ion batteries with layered high-nickel oxides as the cathode material face aggravated deterioration of the high-temperature interface, resulting in a decline in performance stability and potential safety hazards, and more importantly, it cannot overcome the technical bottleneck of electrochemical performance such as discharge capacity, Coulomb efficiency, and cycle life at both room temperature and low temperature of the battery. The working temperature of the lithium-ion battery with a high-nickel cathode material is extended to -60°C to 55°C. Through the component design of a sulfone-based high-concentration electrolyte and the introduction of a lithium salt additive LiClO4, the solvation sheath structure is changed, the HOMO of the system of organic solvent dipoles and ions is reduced, and the basic composition and structural characteristics of the CEI on the surface of the high-nickel cathode material are further regulated, forming an interfacial layer that is dense, firm, and has a low desolvation energy. The battery maintains excellent interfacial stability and capacity retention rate during high-temperature storage and high-temperature cycling, and still releases a high specific capacity and excellent cycling performance at low temperature.

A facility has an ambient zone (30); a lower temperature storage space; an intermediate temperature storage space (42); a higher temperature storage space (44); a plurality of HVAC systems (430, 432, 434) for controlling temperature and humidity in the storage spaces; automated equipment for moving material through the storage spaces and presenting the material for fulfillment of orders. The automated equipment moves in an automation zone (50, 52) above and traversing the storage spaces (42, 44).

A non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery including the same are disclosed herein. In some embodiments, a non-aqueous electrolyte for a lithium secondary battery includes a lithium salt, an organic solvent, and an additive comprising a compound represented by the following Chemical Formula 1:wherein Q is a single bond, or a substituted or non-substituted C1-C10 alkyl group, and each of A1, A2 and A3 independently represents hydrogen (H) or a substituted or non-substituted C1-C10 alkyl group. The non-aqueous electrolyte can scavenge decomposition products of lithium salt to maintain passivation of an SEI film during high-temperature storage. The non-aqueous electrolyte improves battery performance by improving self-discharge phenomenon caused by elution from a positive electrode and breakage of the SEI film at a negative electrode. The battery has improved initial efficiency by formation of an initial coating film to inhibit additional electrolyte decomposition.

A positive electrode active material, where a surface region of the positive electrode active material includes a specific content of element aluminum. The positive electrode material of this application helps to improve the impedance, cycling performance, and high-temperature storage performance of electrochemical apparatuses under high-voltage operating conditions.

To provide a photosensitive resin composition that gives a resin layer having high adhesion with no voids occurring at an interface of a Cu layer in contact with a cured photosensitive resin layer, after a high temperature storage test, and a method of forming a cured relief pattern using the photosensitive resin composition, and a semiconductor device having the cured relief pattern.SOLUTION: A photosensitive resin composition gives a cured film with the occurrence of voids prevented at an interface in contact with a Cu layer, after a high temperature storage test, by containing a cyclic compound having a carbonyl group in a photosensitive resin composition of a specific structure.SELECTED DRAWING: None

A method for preparing a single-particle type positive electrode active material precursor includes (a) mixing a nickel-based hydroxide and an inactive lithium salt to prepare a mixture; and (b) performing a first heat treatment on the mixture to obtain a nickel-based oxide in a form of single particles. According to some example embodiments, a positive electrode active material precursor and a method for preparing the same, and a method for preparing a positive electrode active material including the same minimize or reduce the production process, thereby ensuring long cycle-life characteristics and improving high-temperature storage characteristics. A rechargeable lithium battery using the positive electrode active material can exhibit high initial charging and discharging capacity and efficiency, and can implement long cycle-life characteristics.

Provided are a positive electrode, a method for manufacturing the positive electrode, a positive electrode composition, and a rechargeable lithium battery including the positive electrode, the positive electrode including: a positive electrode current collector; and a positive electrode active material layer on the positive electrode current collector and including a positive electrode active material, a copolymer binder, and an amine. The copolymer binder includes a first structural unit including a carboxyl group and a non-ionic second structural unit, and the carboxyl group and the amine are present in the form of a salt. The positive electrode increases capacity while reducing production cost, thereby ensuring long cycle life characteristics and improving high voltage characteristics and high temperature storage characteristics. A rechargeable lithium battery including the positive electrode may exhibit high initial charge / discharge capacity and efficiency even under high voltage driving conditions, and may achieve long cycle life characteristics.