383results about How to "Improve cycle performance" patented technology

The application discloses a kind of full solid-state battery and its preparation method and application, it is related to solid-state battery technical field.The edge of positive active layer is attached with solidified insulating glue, so as to use the solidified insulating glue to fill the size difference between the positive active layer and the negative active layer, and the end of the positive active layer and the negative active layer is flush, the insulating glue plays a supporting role under extrusion, avoids the problems such as collapse and short circuit caused by the size difference between the positive active layer and the negative active layer;The insulating glue at the edge can be bonded with the negative electrode under high pressure, and when the positive electrode is charged and discharged, the cycle performance difference caused by the volume change of the positive electrode during charging and discharging can be effectively alleviated, and the cycle of the battery is improved;It can also effectively avoid the occurrence of problems such as the edge of the positive electrode dropping material.By setting electrolyte film between the positive active layer and the negative active layer, the impedance between the electrolyte film and the electrode sheet is reduced by using the ionic liquid treatment layer on the electrolyte film, and the battery performance is improved.

The invention relates to the field of lithium ion batteries, and discloses a lithium titanate composite material and a preparation method thereof, a negative pole piece and a preparation method thereof, a lithium battery and a battery pack. The surfaces of lithium titanate particles are sequentially coated with the nitrogen-doped carbon intermediate layer and the two-dimensional MXene material outer layer, and the MXene material outer layer is formed by bridging adjacent particles through hydrogen bonds, so that a'core-shell-bridge 'three-dimensional conductive network structure is constructed, the electronic conductivity of the lithium titanate composite material is remarkably improved, the electron / ion transmission efficiency of the lithium titanate negative electrode is improved, and the lithium titanate negative electrode has a good application prospect. The lithium ion battery has excellent rate capability and cycle performance; and through collaborative optimization of the three-dimensional composite material and the electrolyte, the interface impedance is reduced, and polarization is inhibited, so that the lithium battery still keeps high capacity and long cycle stability under ultrahigh rate, and meanwhile, the problems of discontinuous conductive network and high interface impedance in the prior art are solved. And excellent rate capability and cycle performance can be achieved under ultrahigh rate.

The invention discloses a preparation method of a high-stability photoresponse covalent organic framework membrane and application of the high-stability photoresponse covalent organic framework membrane in selective separation of multiple components. 4-azido azobenzene is prepared by carrying out azido reaction on 4-aminoazobenzene in an acidic aqueous solution, and then a BPTA-TAPB-COF membrane is used as a matrix to prepare the high-stability photoresponse covalent organic framework membrane. 4-azido azobenzene is efficiently grafted to the pore wall of the BPTA-TAPB-COF membrane through a click chemical reaction, the photoresponse covalent organic framework membrane is constructed, and the covalent organic framework membrane can be used for multi-component selective separation and is suitable for multi-component systems with different sizes. The azobenzene group in the pore channel of the prepared Azo-COF membrane is subjected to reversible cis-trans isomerization under the irradiation of ultraviolet / visible light, the response speed is high, and the cycle performance is good; the Azo-COF membrane has good application in the light-operated nanofiltration process, the performance of the Azo-COF membrane is not reduced after the Azo-COF membrane is continuously recycled for 12 days, and the structure of the Azo-COF membrane is kept stable.

The invention relates to a uniform carbon-coated mesoporous silicon carbon negative electrode material and a preparation method and application thereof.The preparation method comprises the steps that a product obtained after pyrolysis and carbonization of a biomass carbon source is subjected to alkali activation treatment, acid pickling, drying, smashing, passivation, water washing and drying are conducted to obtain a mesoporous carbon matrix, nanometer silicon particles are deposited in pores of the mesoporous carbon matrix, and the uniform carbon-coated mesoporous silicon carbon negative electrode material is obtained. Then selecting a low-temperature carbonization material and polyethylene glycol to perform pre-carbonization and complete carbonization treatment on the mesoporous silicon carbon material to obtain a carbon coating layer, and finally obtaining the uniform carbon-coated mesoporous silicon carbon negative electrode material. When the uniform carbon-coated mesoporous silicon carbon negative electrode material is applied to a lithium battery, the mesoporous skeleton can effectively inhibit volume expansion of silicon in a battery circulation process, and the uniform carbon-coated layer can effectively reduce the risk of direct contact between the negative electrode material and an electrolyte, so that a stable SE I film is formed to reduce the occurrence of side reactions; and the first coulombic efficiency and the cycle performance of the battery are further improved.

The present application provides a diaphragm-free lithium ion battery. The battery comprises a positive electrode current collector, a positive electrode active material, a solid electrolyte, a solvent, a negative electrode active material, and a negative electrode current collector. The solid electrolyte is a solid porous organic polymer, which contains specific functional groups, including weakly coordinated anion groups, and the corresponding cation of the anion group is lithium ion. The porous polymer is a solid powder, which can act as a barrier between the positive electrode active material and the negative electrode active material, eliminating the need for a diaphragm and greatly improving the safety performance of the battery.

The invention provides a lithium metal negative electrode protection layer, a preparation method and application thereof, and a lithium metal battery, and relates to the technical field of lithium metal batteries, the protection layer is formed on the surface of a metal lithium foil, and comprises a polymer and an inorganic substance; the polymer comprises polyvinylidene fluoride-hexafluoropropylene; the inorganic substance includes lithium phosphate. The components of the protective layer cooperate with each other, so that lithium dendrites can be physically inhibited, the first discharge specific capacity, the first coulombic efficiency and the cycle performance can be effectively improved, gas can be actively consumed, and the cycle stability and the safety performance of the lithium metal battery can be cooperatively improved from multiple dimensions; the technical problems that an existing protective layer cannot actively eliminate gas, the lithium dendrite inhibiting effect is poor, and the interface stability is poor are solved.

The present disclosure provides a composite pre-lithium thin film and a preparation method thereof and related applications. The composite pre-lithium thin film comprises a loading layer having a first surface and a second surface opposite to the first surface, and the material of the loading layer comprises multi-walled carbon nanotubes; a lithium pouring layer arranged on the first surface of the loading layer; and a resistance buffer layer arranged on the second surface of the loading layer, and the material of the resistance buffer layer comprises single-walled carbon nanotubes and polyvinyl butyl, wherein the mass percentage of the single-walled carbon nanotubes is 0-80 wt.%. The scheme provided by the present disclosure can effectively improve the cycle performance and rate performance of lithium ion batteries, and solve the problems of uncontrollable pre-lithiation rate and easy breaking of lithium metal strips.

The application provides a diaphragm and a preparation method thereof, a secondary battery and an electric device. The diaphragm comprises a base film and a first coating layer and a second coating layer arranged on one side of the base film in sequence. The first coating layer comprises inorganic material and a first binder in a mass ratio of (60-95):(5-40). The second coating layer comprises zinc fluoride, polyacrylic acid and a second binder in a mass ratio of (40-80):(20-60):(1-5). The diaphragm has high mechanical strength and can promote uniform deposition of lithium elements. The application further provides a preparation method of the diaphragm, and realizes preparation of the diaphragm. Finally, the application further provides a secondary battery and an electric device, and the cycle performance and safety performance of the secondary battery and the electric device are significantly improved.

The application relates to the technical field of batteries, in particular to a hard carbon negative electrode material and a preparation method and application thereof. A preparation method of a negative electrode hard carbon material comprises the following steps: carrying out first heat treatment on a mixture of an organic metal catalyst and biomass activated carbon, introducing a gas-phase carbon source and carrying out second heat treatment to obtain first material, and carrying out carbonization treatment and acid pickling treatment on the first material. The method can improve the capacity and initial efficiency of the hard carbon negative electrode material through cooperation of various steps; the method is simple in process and easy to realize large-scale production.

This invention relates to the field of secondary battery technology, specifically to a silicon-carbon composite material, its preparation method, and a lithium-ion battery. The preparation method of the silicon-carbon composite material includes: reacting an organometallic framework ZIF-8 in a saturated metal salt solution and then evaporating and crystallizing it to obtain a metal salt-coated organometallic framework Salt@ZIF-8; pulverizing a silicon-copper alloy precursor and the Salt@ZIF-8 at a mass ratio of 1:0.05-0.7 to obtain a mixed powder; and subjecting the mixed powder to a pyrolysis reaction and acid leaching treatment to obtain the silicon-carbon composite material. The silicon-carbon composite material obtained by this invention exhibits excellent structural stability and electrochemical performance, effectively mitigating the volume expansion of the silicon anode and improving cycle performance and rate performance.

The embodiment of the present application provides an electrolyte, a secondary battery and an electric device, wherein the electrolyte provided by the embodiment of the present application comprises a sodium salt, an organic solvent and an additive, the additive at least simultaneously comprises a B-O bond, a C=C bond and a C=O bond, wherein B in the B-O bond is in an electron-deficient state, so that the additive is acidic, can complex with an acid radical ion of the sodium salt, thereby improving the dissociation degree of the sodium salt and the migration number of sodium ions, and reducing the bulk phase and electrode interface impedance; and the C=C bond and the C=O bond in the additive can effectively reduce the deposition of transition metals such as Mn of the negative electrode, reduce the impedance, can form a highly stable electrode-electrolyte interface structure, can stabilize the positive and negative electrode interface film, and improve the high-temperature storage and cycle performance of the battery, thereby solving the problems that the electrode / electrolyte interface of the existing sodium ion battery is unstable, and is easy to cause the battery to deform and the performance to decay.

The present application relates to ternary high-nickel lithium-ion battery cathode materials and a preparation method thereof. The general expression of the cathode material is Li(Ni 1‑a‑b‑c Co a Mn b D c )O2, 0.01

The utility model provides a kind of high-precision module pressurization fixed-length device, there is located upper fixed-length module and located lower jacking module, fixed-length module includes the clamping assembly of two opposite moving clamping plate, and it is the clamping area of module between clamping plate, jacking module is docked with module and jacking module to clamping area;Two sides of clamping area are provided with pressurizing assembly and pressure-bearing component respectively, pressurizing assembly pressurizes from one side of module, and pressure-bearing component limits the position of other side of module, until module reaches predetermined position.The utility model has strong degree of automation, cycle ability and compatibility, can pressurize different specifications of module, and the fixed-length precision of product machined is high.

The application discloses an electrolyte, a preparation method thereof, and a lithium ion battery. The electrolyte comprises a lithium salt, a nonaqueous organic solvent, and a first additive and a second additive. The first additive is selected from one or more of borate esters with ether chain structures, and the second additive is selected from one or more of sulfonic acid lactones. The application introduces the borate esters with ether chain structures and the sulfonic acid lactones as the additives in the electrolyte, so that an excellent composite CEI film is produced on the surface of a positive electrode, and the electrical performance of the lithium ion battery is improved.

The invention provides a lithium-rich manganese-based positive electrode material, a preparation method thereof and a lithium ion battery containing the lithium-rich manganese-based positive electrode material, and belongs to the field of lithium ion batteries. The chemical formula of the lithium-rich manganese-based positive electrode material is xLi < 2 > MnO < 3 >. (1-x) LiTMO2, 0 lt, xlt; 1, TM is selected from Ni, Co and Mn; the lithium-rich manganese-based positive electrode material comprises a monoclinic Li2MnO3 phase and a rhombic LiTMO2 phase, the content of the monoclinic Li2MnO3 phase is sequentially reduced from inside to outside, the content of the rhombic LiTMO2 phase is sequentially increased from inside to outside, and a spinel phase layer is arranged on the surface of the lithium-rich manganese-based positive electrode material. The lithium-rich manganese-based positive electrode material prepared by the method has the advantages of high thermal stability, high compactness and high cycle performance.

The invention discloses petroleum coke, a non-graphite carbon material, a negative electrode material and a preparation method thereof. The method comprises the following steps: performing first solid removal on a first heavy oil raw material to obtain first purified heavy oil; performing second solid removal on the second heavy oil raw material to obtain second purified heavy oil; mixing the second purified heavy oil with nano-porous carbon to obtain third purified heavy oil and heavy oil containing the nano-porous carbon; carrying out solid-liquid separation on the heavy oil containing the nano-porous carbon to obtain a non-graphite carbon material precursor and fourth purified heavy oil; mixing the third purified heavy oil, the fourth purified heavy oil and the first purified heavy oil to obtain heavy mixed oil; carrying out distillation, pyrolysis and modification treatment on the heavy mixed oil to obtain petroleum coke; carbonizing the non-graphite carbon material precursor to obtain a non-graphite carbon material; the negative electrode material is prepared from petroleum coke and a non-graphite carbon material. The petroleum coke and the non-graphite carbon material with relatively high quality are prepared, and the electrochemical performance of the negative electrode material can be improved.

The present application provides a positive electrode active material, a method for preparing the same, a positive electrode sheet, a secondary battery, and an electric device. In particular, the present disclosure provides a positive electrode active material including a base body and a coating layer, the base body comprising a lithium-rich manganese-based material having a formula xLi2MnO3·(1-x)LiNi y Co z Mn a M 1‑y‑z‑a O2, wherein 0

The invention relates to the technical field of lithium ion batteries, in particular to a composite positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment. The invention provides a preparation method of a composite positive electrode material, which comprises the following steps: mixing a bulk phase dopant, a lithium source and a ternary precursor to obtain a mixture I, and respectively sintering at 815-830 DEG C for 12-14 hours and at 760-770 DEG C for 8-10 hours to obtain a sintered material I-1 and a sintered material I-2; a first coating agent and a second coating agent are mixed with the sintered material I-1 and the sintered material I-2 respectively and then coated, and a sintered material II-1 and a sintered material II-2 are obtained; and mixing the sintered material II-1 and the sintered material II-2 to obtain the composite positive electrode material. According to the invention, the bulk phase dopant and the doped ternary precursor core layer are firstly added, then the first coating agent and the second coating agent are added, and the surface functional layer is synthesized, so that the composite positive electrode material has both high capacity and high cycle stability under the synergistic effect of the bulk phase dopant and the doped ternary precursor core layer.

The utility model relates to winding structure wall pipe production technical field, concretely to a kind of winding structure wall pipe production shaping device, including operation box and spraying mechanism, the top of operation box is equipped with spraying mechanism, the inside of operation box is equipped with spraying mechanism, and the pipe material moving inside is sprayed cooling, the both sides of operation box are equipped with limit mechanism, and two groups of limit mechanism are positioned to the pipe material of different sizes and move shaping, the bottom of operation box is equipped with water-collecting pool, the front end center of operation box is equipped with circulation mechanism, the right front side of water-collecting pool is equipped with water suction pump, the water suction pump is pumped by water suction pipe, and high-pressure water pump is pumped to pipe material by connecting pipe and bottom side four groups of spraying piece, to improve shaping efficiency, improve the stability of cooling, avoid reducing difference greatly, by the roller feeding piece of both sides installation, the pipe material of different sizes is clamped and transported to improve quality.

The invention relates to the technical field of lithium ion batteries, and particularly provides a charging and discharging method of a lithium ion battery. The invention aims to solve the problem of poor cycle performance of the lithium ion battery of the existing blending system. Therefore, the charging and discharging method of the lithium ion battery comprises the following steps: charging the lithium ion battery according to a first constant-current charging mode until the voltage reaches V1, and then converting into a first constant-voltage charging mode; continuously charging according to the first constant-voltage charging mode, and switching to a second constant-current charging mode until the charging rate is reduced to a second charging rate C2; continuously charging according to a second constant-current charging mode, and switching to a second constant-voltage charging mode until the voltage reaches Vmax; continuously charging according to a second constant-voltage charging mode until the charging rate is reduced to a cut-off charging rate Cmin, and stopping charging; and / or, the lithium ion battery discharges according to the first constant-current discharge mode until the voltage is reduced to V2, and then the lithium ion battery discharges according to the second constant-current discharge mode.

The application provides a current collector, a pole piece, a battery, a battery pack and a power utilization device. The current collector comprises a current collector base and a conductive layer. The conductive layer is arranged on at least one surface of the current collector base in the thickness direction. The conductive layer has a concave-convex structure away from the first surface of the current collector base. The current collector can reduce the impedance of the battery and effectively improve the cycle performance of the battery by arranging the concave-convex structure on the conductive layer.

The invention relates to a positive electrode active material and a preparation method thereof, a positive electrode and a lithium ion battery. The positive electrode active material comprises lithium manganate particles and a sodium phytate layer coating the surfaces of the lithium manganate particles. According to the technical scheme, in the positive electrode active material, the sodium phytate layer serves as a coating layer, and six phosphate groups in molecules of the sodium phytate layer and manganese ions dissolved out of lithium manganate particles can form a stable complex, so that the dissolved-out manganese ions are efficiently captured and prevented from being further migrated into an electrolyte to damage the performance of a battery; meanwhile, the sodium phytate layer forms a layer of compact physical barrier on the surfaces of the lithium manganate particles, so that direct contact between the lithium manganate particles and an electrolyte can be effectively blocked, and dissolution of manganese ions is inhibited from the source. Through a synergistic effect of a chelation effect and a physical barrier effect of the sodium phytate layer, the dissolution amount of manganese ions can be remarkably reduced, and the crystal structure of lithium manganate particles is prevented from being distorted, so that the structural stability of the positive electrode active material is improved.

This invention relates to the field of chlor-alkali electrolysis equipment, and more particularly to an assembly of independent unit bipolar ion-exchange membrane electrolyzers, comprising an assembly frame and multiple fixed frames. The assembly frame supports the fixed frames, and independent unit electrolyzers are mounted on the inner sides of each fixed frame via fixing bolts. Each independent unit electrolyzer includes a frame, with a composite plate fixedly connected to the center of the frame. The composite plate separates the cathode chamber and the anode chamber on both sides of the frame. Anode ribs are fixedly connected to the interior of each anode chamber, and an anode mesh is installed at the end of each anode rib away from the composite plate. This invention creates forced disturbance to the solution inside the anode chamber during continuous replenishment of refined brine, significantly improving solution mixing and flow efficiency, allowing the brine to fully contact the electrodes, and enhancing the completeness of the electrolysis reaction. Compared to traditional passive flow methods, the solution circulation effect is significantly improved.

The invention provides an electrolyte and a lithium ion battery using the same, the electrolyte comprises an electrolyte additive, and the electrolyte additive comprises a first compound and a second compound; wherein the chemical structural formula of the first compound is shown as a formula (I-a) or a formula (I-b), and the chemical structural formula of the second compound is shown as a formula (II); in the formula (I-a), the formula (I-b) and the formula (II), R1 to R10 are respectively and independently selected from hydrogen atoms, halogen atoms, carbonyl groups, cyano groups, isocyanate, isothiocyanate, unsubstituted or substituted alkyl groups of C1 to C10, unsubstituted or substituted alkoxy groups of C1 to C10, unsubstituted or substituted alkenyl groups of C2 to C10, unsubstituted or substituted alkynyl groups of C2 to C10 and unsubstituted or substituted aryl groups of C6 to C20; and in the formula (II), the number of cyano groups is greater than or equal to 1. By introducing the first compound and the second compound, the normal-temperature and high-temperature cycle performance and low-temperature performance of the battery during high-voltage operation are improved.

The utility model discloses an integrated disinfection plate and a disinfection cabinet with the same, the disinfection plate comprises a mounting plate, the mounting plate is provided with an air passing channel and an air outlet channel, an air inlet part is integrally formed on the mounting plate, the air inlet part is provided with an air inlet channel, and the air outlet end of the air inlet channel is communicated with the air inlet end of the air passing channel. The utility model has the following advantages and effects: the scheme utilizes a new mechanical structure, and has the effects of reducing the production cost and improving the production efficiency and the drying performance.

The application provides an anode sheet and a secondary battery using the same, the anode sheet comprising an anode active material layer, the anode active material layer comprising an anode active material and a binder, the anode active material comprising a silicon-based active substance, and the binder comprising polyacrylic acid and its derivatives and polyvinyl alcohol; the anode sheet is laser-perforated; when the mass content of the silicon-based active substance is a constant value, the mass content of the polyvinyl alcohol is in a positive proportional relationship with the power of the laser perforation; and when the power of the laser perforation is a constant value, the mass content of the polyvinyl alcohol is in a positive proportional relationship with the mass content of the silicon-based active substance. Compared with the prior art, the anode sheet provided by the application selects anode sheets containing different contents of the binder according to different laser perforation powers or different silicon contents of the silicon anode sheet, thereby avoiding excessive burning of the active substance at the non-perforated part of the silicon anode sheet, and improving the cycle performance and safety performance of the battery in the charging and discharging process.

The application discloses a negative active material, a preparation method of the negative active material, a secondary battery and an electric device, and the negative active material comprises a silicon-based material, a carbon coating layer arranged on the surface of the silicon-based material, and a titanium oxide layer arranged on the surface of the carbon coating layer, and the electron paramagnetic resonance spectrum of the negative active material has a characteristic peak at g=2.002-2.004. The application sets the titanium oxide layer containing oxygen defects on the surface of the carbon-coated silicon-based material, improves the rate performance on the basis of improving the initial coulomb efficiency and the cycle performance, and has a wide application prospect.

This invention belongs to the field of battery materials technology, and discloses a single-crystal lithium nickel manganese oxide material, its preparation method, and a lithium-ion battery. The single-crystal lithium nickel manganese oxide material contains Li... x Ni 2‑x The percentage content of O2 is C≤1.6%, C=(I LixNi2‑xO2 / (I LixNi2‑xO2 +I LiNi0.5Mn1.5O4 ))×100%, I LixNi2‑xO2 For Li in the XRD refinement results x Ni 2‑x The diffraction peak intensity corresponding to O2, I LixNi2‑xO2 +I LiNi0.5Mn1.5O4 To add LiNi to the XRD refinement results 0.5 Mn 1.5 O4 and Li x Ni 2‑x The diffraction peak intensity of the O2 two-phase model indicates a grain size of 5–11 μm. The aforementioned single-crystal lithium nickel manganese oxide material was prepared via a lithium-deficient high-temperature sintering and lithium-replenished low-temperature sintering process. Li x Ni 2‑x Large-particle monocrystalline lithium nickel manganese oxide materials with low O2 content avoid electrolyte decomposition under high voltage, thus preventing the generation of HF and Li. x Ni 2‑x The O2 reaction can effectively improve the cycle stability of the battery. Simultaneously, the high compaction density of monocrystalline lithium nickel manganese oxide material can enhance the battery's energy density, thermal stability, mechanical properties, and durability. The method for preparing monocrystalline lithium nickel manganese oxide material in this invention is relatively simple, reliable, and effective, and can utilize existing production lines.

The application relates to the technical field of battery materials. A modified negative electrode current collector, a preparation method thereof and a sodium ion battery are disclosed. The disclosed modified negative electrode current collector comprises a current collector substrate, a first modification layer and a second modification layer; the components of the first modification layer comprise 0.2-1.0% of an organic sodium-philic A salt and 0.1-0.6% of a fluorinated salt according to mass percentage; the components of the second modification layer comprise 0.5-1.5% of a sodium supplementing agent according to mass percentage; A refers to at least one of elements Bi, Sn and Zn. In the first charge-discharge process of the battery, the A element and the fluorinated salt in the first modification layer form a composite of Na X A and NaF in situ, Na X A can promote the uniform deposition of sodium on the negative electrode side, NaF can improve the strength of the SEI film on the negative electrode side, and the cycle performance of the battery is further improved. The sodium supplementing agent of the second modification layer can decompose and supplement sodium during the charge-discharge process, and the electrochemical performance is further improved.

The application provides a sodium ion battery negative electrode material and a preparation method thereof. The preparation method of the sodium ion battery negative electrode material comprises the following steps: obtaining a coal-based raw material; performing a defect operation on the coal-based raw material, so that the coal-based raw material is oxidized and crosslinked to obtain a pre-oxidized coal-based negative electrode material; performing a hot extraction treatment on the pre-oxidized coal-based negative electrode material to remove organic impurities in the pre-oxidized coal-based negative electrode material; and performing a high-temperature doping operation on the pre-oxidized coal-based negative electrode material after the hot extraction treatment to obtain the sodium ion battery negative electrode material. The preparation method of the sodium ion battery negative electrode material can effectively change the disorder degree of the microstructure, increase the interlayer spacing of the coal-based raw material, and further effectively improve the reversible specific capacity and the cycle performance.