20 results about "High temperature storage" patented technology

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.

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).

This application relates to the field of electrochemical technology and provides a secondary battery, including a positive electrode, a negative electrode, and a separator. The positive electrode, negative electrode, and / or separator include a metal-organic compound, and the metal-organic compound includes M... a Zr6O m (OH) n (OL) 6‑(x+y) / 2 (sol) x (blank) y N b The unsaturated coordination defect rate of metal-organic composites is 15%~50.1%. Through the above settings, the rate performance, capacity utilization under high and low temperature conditions, internal resistance, cycle life, high temperature storage capacity retention and recovery rate of lithium-ion batteries can be improved.

The application discloses a kind of middle-high nickel low cobalt ternary positive electrode materials and preparation method thereof, belong to lithium ion battery technical field.The method is first with the Al, Zr and Y element of specific raw material single crystal doping, then after twice doping coating, introduce F, W, Ti and other elements to construct composite material, the product not only effectively solves the problem of poor rate performance of existing low cobalt ternary positive electrode material, simultaneously can effectively avoid the poor high-temperature storage of middle-high nickel ternary positive electrode material, prone to gas production phenomenon situation.The application also discloses the middle-high nickel low cobalt ternary positive electrode material prepared by the method and the application of power battery.

Disclosed is a rechargeable lithium battery including a positive electrode including a positive active material; a negative electrode including a negative active material; an electrolyte solution including a lithium salt and a non-aqueous organic solvent; and a separator between the positive and the negative electrodes, the separator including a porous substrate and a coating layer positioned on at least one side of the porous substrate. The negative active material includes a Si-based material; the non-aqueous organic solvent includes cyclic carbonate including ethylene carbonate, propylene carbonate, or combinations thereof, the cyclic carbonate being included in an amount of about 20 volume % to about 60 volume % based on the total amount of the non-aqueous organic solvent; and the coating layer includes a fluorine-based polymer, an inorganic compound, or combinations thereof. The rechargeable lithium battery has improved cycle-life and high temperature storage characteristics.

This application relates to the field of battery technology, providing a battery cell and its preparation method, a battery device, and an electrical device. The battery cell provided in this application includes a positive electrode sheet, which includes a positive current collector and a positive electrode film layer disposed on at least one side of the positive current collector. The positive electrode film layer includes a positive electrode material, a first binder, and a first conductive agent. The first binder has a fibrous structure, and based on the total mass of the positive electrode film layer, the content of the first binder is less than or equal to 1.2 wt%. In the battery cell of this application, the specific surface area of ​​the positive electrode sheet is controlled at a low level while the compaction density is controlled at a high level. This helps to improve the integrity of the positive electrode material, making it less likely for fresh interfaces to be generated due to particle breakage. This significantly suppresses side reactions in the battery, thereby significantly improving the battery's capacity retention rate, resulting in better high-temperature storage performance.

Provided are a negative electrode material and a preparation method thereof and a lithium ion battery. The negative electrode material includes natural graphite and a coating layer coated on the surface of the natural graphite, and the compression index K of the negative electrode material is: 30≤K≤80; in which the compression index K=100(V0-VF) / V0, where V0 is the apparent volume per unit mass in a loose state, and VF is the tapped volume per unit mass. The negative electrode material of an embodiment has suitable powder fluidity, reduced functional groups on the surface of negative electrode material particles, is easy to disperse during processing, and at the same time, fewer functional groups on the surface reduce side reactions during high temperature storage, thereby improving the high temperature storage performance of the negative electrode material.

The present application relates to the technical field of lithium ion batteries, and provides a lithium ion battery, which comprises a battery cell and an electrolyte, and the battery cell comprises a positive electrode sheet, a diaphragm and a negative electrode sheet which are arranged in a stack, the positive electrode sheet body has a first surface and a second surface which are opposite to each other along the thickness direction, a plurality of protruding parts exist on the first surface of the positive electrode sheet, and corresponding recessed parts exist on the second surface, the electrolyte contains A wt% of a sulfur-containing additive, the sulfur-containing additive comprises at least one of a sulfonate, a sulfate and a sulfite, 0.3≤H / T≤6 and 0.1≤A≤6, wherein H is the height of the protruding part, the unit is μm, T is the thickness of the diaphragm, the unit is μm, 1≤D≤8, and / or 0.3≤Z=H / D≤80, 0.02≤A / Z≤4. The battery has good electrochemical performance and safety performance, can inhibit the generation of lithium dendrites of the negative electrode, and can improve the self-discharge performance and relieve the gas generation in high-temperature storage.

The application discloses a kind of based on high temperature under power lead storage battery initial charging method, belong to lead storage battery technical field.The method includes: calibration reference resistance;Detection battery parameter to be repaired;Matching classification;Pre-discharge;Composite charging.The application is aimed at the scene of initial charging, activates negative active material, provides the charging process of accurate adaptation battery state, through the coherent process of "state determination-pre-discharge break passivation-stage charging", breaks the vicious cycle of "oxygen production heat release-negative electrode power shortage" from the root, eliminates battery thermal runaway safety hazard, simultaneously solves the failure problem that charger does not turn on when charging in summer, solves the technical pain point that power lead storage battery (because negative electrode contains humic acid, high impurity content) self-discharge aggravates in summer high temperature storage stage, negative electrode is seriously short of power;Overcome the disadvantages that existing conventional charging mode has no battery state sensing ability, fixed charging process can lead to positive oxygen production, negative oxygen composite heat release and charging shortage.

Provided are an electrolyte additive, an electrolyte for a lithium secondary battery containing the same, and a lithium secondary battery. Specifically, the present application can provide an electrolyte for a lithium secondary battery containing an electrolyte additive including a compound represented by Formula 1, which can effectively suppress the deterioration of a positive electrode and is not easily decomposed on a negative electrode, and a lithium secondary battery containing the same, thereby achieving excellent high-temperature storage characteristics and high-temperature cycle characteristics.

This invention provides a battery comprising an electrolyte and a negative electrode, wherein the negative electrode active material comprises a silicon-containing material; the electrolyte comprises a first additive and a second additive, the first additive comprising fluoroethylene carbonate, and the second additive comprising a compound having a structure of Formula 1, wherein R1-R3 are each independently selected from substituted or unsubstituted C1-C10 alkyl, substituted or unsubstituted C2-C10 alkenyl, or substituted or unsubstituted C2-C10 alkynyl groups, and at least one unsaturated group is included in R1-R3. The battery provided by this invention uses silicon material as the negative electrode and exhibits excellent room temperature and high temperature cycling performance, as well as high temperature storage performance.

This application discloses a composite phase change insulation structure for high-temperature storage tanks. A high-temperature phase change material layer is added between the refractory insulation material layer and the thermal insulation material layer. The composite multi-layer phase change insulation structure, consisting of a refractory layer, a phase change layer, and a thermal insulation layer from the inside out, reduces internal temperature stratification and heat diffusion of high-temperature substances within the storage tank. This improves the uniformity and stability of the temperature distribution of the medium inside the tank, reduces heat loss, and exhibits strong high-temperature thermal stability, effectively blocking the influence of external ambient temperature and maintaining a constant temperature for the stored substances, thus significantly enhancing the insulation effect. Under the same insulation layer thickness, the insulation structure combined with the phase change material exhibits better insulation performance. While significantly improving the high-temperature heat storage capacity of the storage tank, it also helps to reduce and thin the insulation structure, and opens up new avenues for the application of high-temperature phase change materials in the field of storage tank insulation.

This invention belongs to the field of secondary batteries, and provides a novel structural additive, a preparation method, a non-aqueous electrolyte containing the novel structural additive, and a secondary battery. The novel structural additive is a complex of an inner salt compound containing a hydrocarbon sulfonate anion and a quaternary ammonium cation with difluorophosphate, having the structure shown in Formula I: where R1 is a hydrocarbon-like group with 1-6 carbon atoms; R2 is a chain-like or cyclic quaternary ammonium cation; R3 and R4 are independently selected from one of , , , , or ; R5, R6, and R7 are independently selected from hydrocarbon groups or hydrocarbon oxygen groups; R8, R9, and R... 10 The elements are independently selected from hydroxyl groups; n=1~6, m=1~6, p=1~6, and n, m, and p are independent of each other; M is a metallic element selected from Li or Na. A non-aqueous electrolyte and a secondary battery containing this novel structural additive are provided, which can improve the battery's low-temperature discharge performance and high-temperature storage performance, and extend cycle life.

The application discloses a kind of sodium ion battery electrolyte and electrochemical device.Electrolyte contains 0.1-20% zwitterionic additive and 0.5-1wt% of vinyl sulfate;% is the weight percentage of each component in electrolyte;Additive is as shown in structural formula I, wherein, R1, R2, R3 independently be alkyl, alkenyl, alkynyl, with 1-6 carbon atoms, contain 0-1 halogen atom, contain 0-1 carbonyl substituent, contain 0-1 ester group substituent, contain 0-1 aryl substituent, or 1-6 ring alkyl, 2-6 ring alkenyl with carbon atom number.This application additive and vinyl sulfate applied to electrolyte can form similar monolayer structure on the surface of negative electrode by coulomb interaction, uniformly adsorbed on the negative electrode interface, avoid the dissolution of negative electrode SEI film, can effectively improve the capacity retention rate of high temperature cycle of battery, reduce the volume expansion rate of high temperature storage.

This invention discloses a method for preparing a wide-temperature-range flame-retardant electrolyte for sodium batteries. By employing multi-element doping modification, the electrolyte achieves quaternary synergistic flame retardancy of phosphorus, nitrogen, fluorine, and boron. After ignition, the self-extinguishing time is ≤0.3s. After 72 hours of high-temperature storage at 120℃, there is no significant decomposition or risk of combustion or explosion. Furthermore, the fluorocarbonate solvent and flame retardant work synergistically to further enhance the flame-retardant effect of the electrolyte, significantly reducing the safety risks of the battery under extreme temperatures. Simultaneously, the modified electrolyte maintains excellent electrochemical performance, with a significantly expanded operating temperature range of -60℃ to 120℃. Ion conductivity is ≥12.5mS / cm at 25℃ and ≥1.2mS / cm at -60℃. At -40℃, the specific capacity retention rate at 0.2C discharge is ≥85%, and at 100℃, the capacity retention rate after 200 cycles at 1C is ≥78%. This method solves the performance degradation problem of existing electrolytes under extreme temperatures and is suitable for various extreme scenarios such as low temperature, high temperature, and wide temperature variations.

This invention provides a negative electrode material, a method for manufacturing the same, and a lithium-ion battery. [Solution] The negative electrode material includes natural graphite and a coating layer covering the surface of the natural graphite. The compression index K of the negative electrode material is 30 ≤ K ≤ 80. The compression index K = 100(V0 - V F ) / V0, where V0 is the apparent volume per unit mass in the dispersed state, V F This is the tap volume per unit mass. The anode material of the present invention has appropriate powder fluidity, reduces the functional groups on the surface of the anode material particles, improves dispersibility during processing, and, because there are fewer functional groups on the surface, reduces side reactions during high-temperature storage, thereby improving the high-temperature storage performance of the anode material.

The present disclosure provides a lithium battery. Specifically, the lithium battery comprises an electrolyte, the electrolyte comprises a fluorinated ether solvent; wherein the fluorinated ether solvent comprises at least one compound of formula (I): wherein R2 and R3 are each independently selected from alkylene or fluorinated alkylene, and the total number of carbon atoms of R2 and R3 is 4, and the total number of fluorine atoms is ≤1; R1 and R4 are each independently methyl or fluorinated methyl, and the total number of fluorine atoms in R1 and R4 is 1-4. Such electrolyte can improve the cycle performance of medium-nickel high-voltage lithium battery, reduce the direct current resistance growth rate under high temperature storage conditions, and is beneficial to the long-term stable operation of lithium battery.

The application provides a nonaqueous electrolyte additive, a preparation method and application thereof, and the nonaqueous electrolyte additive is a lithium salt sulfimide additive containing boron, contains partial structures of LiFSI and LiBOB, can effectively improve ion conductivity, film forming performance, cycle performance and high-temperature storage performance of a battery, and can avoid corrosion of sulfimide to a current collector.

Provided are a negative electrode material and a preparation method thereof and a lithium ion battery. The negative electrode material includes natural graphite and a coating layer coated on the surface of the natural graphite, and the compression index K of the negative electrode material is: 30≤K≤80; in which the compression index K=100(V0−VF) / V0, where V0 is the apparent volume per unit mass in a loose state, and VF is the tapped volume per unit mass. The negative electrode material of an embodiment has suitable powder fluidity, reduced functional groups on the surface of negative electrode material particles, is easy to disperse during processing, and at the same time, fewer functional groups on the surface reduce side reactions during high temperature storage, thereby improving the high temperature storage performance of the negative electrode material.