17results about How to "Avoid capacity loss" patented technology

The invention belongs to the technical field of new energy materials, and discloses a fused salt auxiliary valence gradient doped modified single crystal positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: mixing a transition metal source, a lithium source, a manganese source and a molten salt auxiliary agent, sequentially carrying out first sintering and second sintering, and removing the molten salt auxiliary agent to obtain a doped modified single crystal positive electrode material precursor; and tempering the doped modified single-crystal positive electrode material precursor to obtain the fused salt auxiliary valence gradient doped modified single-crystal positive electrode material, the doped modified single crystal positive electrode material prepared by the invention can effectively avoid the capacity loss of the material, significantly reduce lattice mismatch in the lithium intercalation / deintercalation process, and relieve the volumetric strain in the charge-discharge process. Meanwhile, the formed M-O bond can enhance the structural stability of the material and inhibit the formation of microcracks of the material. The preparation method of the positive electrode material is convenient for industrial application, and provides a thought for commercial modification of the positive electrode material.

The invention discloses a high-nickel ternary positive electrode material with a surface coating, a preparation method of the high-nickel ternary positive electrode material and a lithium ion battery, and belongs to the technical field of lithium ion battery electrode materials. The preparation method provided by the invention comprises the following steps: mixing a high-nickel precursor Ni < x > Co < y > Mn < 1-x-y > (OH) < 2 > with a lithium source, and sintering to obtain a high-nickel lithium ion layered oxide, wherein x is more than or equal to 0.7 and less than 1, and y is more than 0 and less than 0.3; and carrying out dry mixing on the high-nickel lithium ion layered oxide, a titanium source and a cobalt source, then sintering, and cooling at the rate of 15-30 DEG C / min after sintering is finished, so as to obtain the lithium ion battery cathode material. The CoTiO3 conductive coating is constructed on the surface of the high-nickel ternary positive electrode material in situ, and when the high-nickel ternary positive electrode material with the surface coating provided by the invention is applied to a lithium ion battery, the high-nickel ternary positive electrode material has high ionic conductivity and specific discharge capacity and good cycle stability.

The method comprises the following steps: mixing a zero-valent iron source, a + 2-valent iron source, a carbon source and a solvent, and carrying out a reaction so as to obtain a solution A; adding a sodium source and a phosphorus source into the solution A, and reacting to obtain a solution B; adding a dispersing agent into the solution B, and reacting to obtain a solution C; stirring the solution C to a gel state, and drying to obtain a precursor; and carrying out ball milling treatment on the precursor, pre-sintering at a low temperature under a protective atmosphere, and sintering at a high temperature to obtain the sodium ferric pyrophosphate material. According to the invention, a 0-valent iron source and a + 2-valent iron source are adopted, the valence state of the precursor iron source is regulated and controlled, and the high-purity ferric sodium pyrophosphate positive electrode material is synthesized under a standard stoichiometric ratio, and has a good crystallographic structure and excellent electrochemical performance; meanwhile, the material has the characteristics of low cost, simple preparation and easy large-scale production, and has a relatively good application prospect in the field of electrochemical energy storage.

The present invention provides a perovskite-type lithium adsorbent, a preparation method and application thereof. The chemical formula of the perovskite-type lithium adsorbent is H x La y TiO 3 , x is 0.05 to 1.85, y is 0.05 to 0.65, and x+3y=2 is satisfied; the preparation method comprises: mixing a lithium source, a lanthanum source, a titanium source and a complexing agent, heating and drying, and then sequentially performing oxidation sintering at 500 to 1200° C. and forming sintering at 950 to 1350° C. to obtain Li x La y TiO 3 The molding material is acid-leached to obtain a perovskite-type lithium adsorbent. The lithium adsorbent of the present invention is formed by high-temperature sintering, which avoids the adsorbent capacity loss caused by traditional granulation molding. The adsorbent has stable properties, low acid leaching loss, and long cycle life. It also has high lithium adsorption capacity and lithium selectivity, and is suitable for lithium extraction from a variety of salt lake brines by adsorption.

This application relates to a high-nickel cathode material and its preparation method, and a lithium-ion battery. The chemical formula of the high-nickel cathode material is Li. σ Ni a Co b Mn c M1 x M2 y M3 z O 2+α Wherein, 0.80<σ<1.20, a+b+c+x+y+z=1, 0.7<a<1.0, 0<b<0.05, 0<c<0.3, 0<x<0.3, 0<y<0.3, 0<z<0.3, 0<α<0.1, M1, M2, and M3 are each independently including at least one of Al, Co, Zr, Ti, Mg, Y, La, Sr, Ba, W, Mo, Nb, and Si, and M1, M2, and M3 are all different; the high-nickel cathode material includes a high-nickel material matrix and a coating layer. Cu-Kα rays are used to perform XRD measurements on the high-nickel material matrix and the high-nickel cathode material, respectively. The intensity of the (104) diffraction peak appearing in the diffraction angle range of 44-45° is recorded as I. b (High-nickel material matrix) and I c (High-nickel cathode material), the unit of diffraction peak intensity is counts, let the diffraction peak intensity difference P = I c -I b 0 < P < 1000. The high-nickel cathode material provided in this application has better high-temperature cycling performance and a low DC internal resistance growth rate.

This invention relates to a temperature control system for FTU battery packs, belonging to the field of power distribution automation technology. It includes an FTU device, a standard 5-pin backup power interface, a DC24V power supply, a battery pack, a temperature sensor, a heating element, and a temperature controller. The battery pack is connected to the FTU via pins 4 and 5. The temperature sensor is connected to the temperature controller via pin 1. The positive and negative terminals of the heating element are connected to the temperature controller via pins 2 and 3. The temperature controller is connected to the DC24V power supply and compares the temperature signal collected by the temperature sensor with a temperature threshold to control the start and stop of the heating element, achieving closed-loop temperature control of the battery pack. This invention achieves a "zero-destructive" upgrade of existing equipment, eliminating the need for opening holes or external wiring in the FTU protective enclosure. It retains the original sealing and protection rating (IP rating) of the equipment at the factory, preventing changes in the operating environment such as water ingress, condensation, and dust that might be introduced during modification, thus ensuring the long-term reliability of outdoor electrical equipment.

The present invention provides a non-aqueous liquid electrolyte that can undergo capacity loss during continuous charging of a cell. A non-aqueous liquid electrolyte containing oxalato-complex anions (A), LiPF6, a symmetrical chain-form carbonate, and a chain-form carboxylic acid ester (C) in which the viscosity at 25°C is 0.01-0.47 cP, wherein the non-aqueous liquid electrolyte is characterized in that: the ratio (A / B) of the amount (mass) of oxalato-complex anions (A) to the amount (mass) of PF6- anions (B) is 0.0001-0.30; and the total amount of the symmetrical chain-form carbonate and the chain-form carboxylic acid ester (C) in which the viscosity at 25°C is 0.01-0.47 cP, relative to the total amount of the non-aqueous liquid electrolyte, is 1-45 mass%.

This invention relates to the field of lithium-ion battery cathode material technology, specifically to a ternary composite doped high-nickel cathode material, its preparation method, and its application. The preparation method of the ternary composite doped high-nickel cathode material includes the following steps: preparing a solution A of nickel, cobalt, and manganese salts; preparing a solution B of aluminum, magnesium, and zirconium salts; in the presence of a precipitant, first performing a first co-precipitation reaction in solution A to generate a core precursor, then adding solution B to perform a second co-precipitation reaction to generate a shell precursor on the core surface, thus obtaining a core-shell structure precursor; mixing it with a lithium source and then performing gradient-segmented sintering, followed by post-treatment to obtain the final product. This invention, by concentrating the ternary composite doping elements in the shell layer, significantly improves the structural and thermal stability of the material while ensuring high capacity. The resulting cathode material exhibits excellent capacity retention and rate performance under high-pressure cycling conditions.

The invention discloses an alternating copolymer, and belongs to the technical field of lithium battery materials, a molecular main chain of the alternating copolymer is formed by rigid fragments and flexible fragments in an alternating manner, the rigid fragments contain rigid benzene ring structures and ferrocene structures, and the flexible fragments are ethyl structures. The invention also discloses a synthesis method of the alternating copolymer and an application of the alternating copolymer in a lithium battery positive electrode material. The alternating copolymer not only contains a rigid conjugated structure beneficial to electron transmission, but also has a flexible twisted structure beneficial to rapid ion transmission, the defects of a full-rigid chain segment or a full-flexible chain segment are effectively avoided through the rigid-flexible structural design, and meanwhile, the alternating copolymer has the advantages of the rigid conjugated structure and the flexible twisted structure; according to the present invention, the material has the rapid electron and ion transmission performance under the condition of no damage to the electrode energy density, and can provide excellent rate performance, high specific capacity and good long cycle performance when the material is adopted as the lithium battery positive electrode.

The invention relates to the technical field of batteries, in particular to a positive plate and a battery. The positive plate comprises a current collector, an inactive layer, an active substance layer and a tab, the inactive layer and the active material layer are arranged on at least one side surface of the current collector; the active material layer comprises an active material, and the non-active layer does not comprise an active material; and the edge of the inactive layer exceeds the edge of the active substance layer along the extension direction of the tab. The non-active layer not only has a protection effect on the current collector, but also can avoid the capacity loss of a transition zone, and does not affect the capacity exertion of active substances.

The lithium battery pack comprises single batteries and a multifunctional structure assembly, and the multifunctional structure assembly comprises a heat conduction frame and the anti-expansion structure arranged in the heat conduction frame in an abutting mode; the anti-expansion structure comprises a waveform structure panel formed by orthogonality of transverse waves and longitudinal waves, the waveform structure panel meets the following relational expression: # imgabs0 #, x and y are the abscissa of each point of the waveform structure panel along the x axis and the ordinate of each point of the waveform structure panel along the y axis, and Z (x, y) is the normal coordinate of each point of the waveform structure panel along the z axis; l and w are the length and the width of the waveform structure panel; nx and ny are the number of wave crests of the waveform structure panel in the transverse direction and the number of wave crests of the waveform structure panel in the longitudinal direction; a is the amplitude of the waveform on the waveform structure panel. According to the lithium battery pack, the expansion force can be effectively controlled, and meanwhile, the heat dissipation efficiency of the battery pack is improved.

This invention discloses a novel electropolymerizable ionic liquid with an X-Y structure, wherein X includes at least one of aniline, pyrrole, and thiophene, and Y includes at least one of imidazole and pyridine. This ionic liquid allows for the electrochemical polymerization of monomer materials on the cathode surface via an in-situ formation process, achieving electrochemical in-situ coating of the cathode material. This effectively transports lithium ions while avoiding the impact of the high oxidation activity of high-voltage active materials on electrolyte stability, thereby preventing battery capacity loss.

The application discloses a kind of negative electrode material and its preparation method and application, negative electrode material includes: porous Si C, silicon nanometer layer and carbon nanometer layer;Wherein, the layer number of silicon nanometer layer is greater than or equal to 1, the layer number of carbon nanometer layer is greater than or equal to 1;Negative electrode material uses porous Si C as framework, silicon nanometer layer and carbon nanometer layer are spaced distribution in the pore of porous Si C;The pore size of the pore of porous S i C is between 1nm-500nm;The thickness of silicon nanometer layer is between 1nm-50nm;The thickness of carbon nanometer layer is between 1nm-50nm;Lithium battery prepared by using the negative electrode material provided in the embodiment of the application has lower volume expansion rate, higher mass specific capacity, good conductivity and cycle life.

The invention provides a tungsten-coated positive electrode material precursor and a preparation method thereof, a positive electrode material, a lithium ion battery and electric equipment, and relates to the field of positive electrode material precursors. The tungsten-coated positive electrode material precursor comprises an inner core and a coating layer coating the inner core, the inner core is nickel-containing hydroxide without tungsten, and the coating layer is nickel-containing tungstate. According to the tungsten-coated positive electrode material precursor, the coating layer is nickel-containing tungstate, a battery prepared from the positive electrode material sintered into the tungsten-coated positive electrode material precursor has both capacity performance and cycle performance, the core of the tungsten-coated positive electrode material precursor is not doped with tungsten, and capacity loss can be avoided after the battery prepared from the positive electrode material sintered into the tungsten-coated positive electrode material precursor is avoided.

The embodiment of the invention discloses a method for calibrating a thermometer of an epitaxial furnace, and the method comprises the steps: S1, preparing an epitaxial wafer at a reference vapor deposition temperature shown by the thermometer of the epitaxial furnace; s2, the resistivity corresponding to the epitaxial wafer is obtained; and S3, calibrating the thermometer according to the actual vapor deposition temperature corresponding to the resistivity.

The utility model belongs to the technical field of redox flow batteries, and particularly relates to a novel liquid storage tank for an all-vanadium redox flow battery energy storage system, which comprises a liquid storage tank body, the liquid storage tank body is of an integrated structure, a partition plate is arranged in the liquid storage tank body, and the interior of the liquid storage tank body is divided into a positive electrode electrolyte area and a negative electrode electrolyte area by the partition plate. Liquid inlets are formed in the top ends of the positive electrode electrolyte region and the negative electrode electrolyte region, and liquid outlets and pipeline assemblies are arranged at the bottom ends of the positive electrode electrolyte region and the negative electrode electrolyte region; the positive electrolyte and the negative electrolyte are stored in the same liquid storage tank through the partition plate, the occupied area and the manufacturing cost are effectively reduced, the pipeline assembly can improve the space utilization rate in the tank body, the time for the electrolyte to flow into the total liquid in the tank body is prolonged, the electrolyte is promoted to flow more uniformly, the effective heat dissipation area and the heat dissipation efficiency of the electrolyte are improved, and the service life of the battery is prolonged. And the design of the integrated liquid storage tank is particularly suitable for a small energy storage system.

The present invention discloses a mobile phone lithium battery with overcharge prevention, comprising a battery body, a battery shell disposed on the outside of the battery body, a pole disposed at the middle position inside the battery shell, a pressure valve disposed on one side of the top of the battery shell, a positive terminal disposed on the side of the pressure valve close to the pole, positive plates disposed at both ends of the pole, and a circuit board disposed on the side of the positive plate away from the pole. The present invention controls current detection, temperature detection and voltage detection through a power management chip to detect the power, temperature and voltage of the battery being charged, and imports the detection results into data analysis and calculation. When the temperature exceeds or equals to 60°C, charging is stopped directly, and when the voltage of the battery being charged is greater than or equal to 4.2V, the battery is directly stopped from charging, thereby reducing the danger brought about during the charging process and avoiding the problem of battery capacity reduction.