27results about How to "High reversible capacity" patented technology

This invention belongs to the field of hard carbon technology, specifically relating to a bamboo-based and lignin-based hard carbon composite material, its preparation method, and its applications. The process involves pretreating raw materials to obtain pretreated material; pretreating the pretreated material with an acidic oxidant to obtain acidic oxidant pretreated material; pre-oxidizing the acidic oxidant pretreated material to obtain pre-oxidized material; pre-carbonizing the pre-oxidized material under a protective atmosphere to obtain pre-carbonized material; pulverizing the pre-carbonized material to obtain pulverized material; acid washing followed by water washing to obtain purified material; soaking the purified material in acid, filtering, and drying to obtain soaked material; mixing the soaked material with a modifier, and high-temperature coating and carbonizing under a protective atmosphere to obtain bamboo-based coated hard carbon or lignin-based coated hard carbon. Mixing the two types of hard carbon and carbon coating yields a bamboo-based and lignin-based hard carbon composite material, which is used in negative electrode sheets and batteries. When applied to batteries, the hard carbon composite material of this invention can improve battery energy density.

The invention discloses a sodium-rich positive electrode material, a preparation method thereof and a sodium ion battery, the component of the positive electrode material is represented as NaxM1yFe1 / 3Sb1 / 3O2, and the element M1 is one or more of inactive metal elements without oxidation-reduction activity, such as Li, Na, Mg, Zn, Ca and the like. Wherein 1 < = x < = 4 / 3, 0 < = y < = 1 / 3. The positive electrode material is rich in sodium ions and has a special superlattice structure, a sodium ion battery prepared from the positive electrode material is high in reversible capacity and relatively high in capacity retention ratio, the problem that the capacity of the positive electrode material in the sodium ion battery is not high is solved, and the energy density of the battery is improved.

This invention discloses a hard carbon material with ultra-high platform capacity, its preparation method, and its applications. The hard carbon material is prepared by hydrothermal reaction and high-temperature carbonization, with a particle size of 2-4 μm, a pore size of 0.4-200 nm, and a specific surface area of ​​no more than 15 m². 2 / g, with a platform capacity ratio of not less than 40%; the preparation method of hard carbon material is as follows: S1: Add surfactant to pectin aqueous solution for hydrothermal reaction, and obtain hard carbon microspheres after filtration and drying; S2: Carbonize the hard carbon microspheres of S1 at high temperature under an inert atmosphere, and obtain hard carbon material with ultra-high platform capacity after cooling. The hard carbon material of the present invention can be used as a negative electrode material for lithium-ion batteries, which can significantly improve the platform capacity ratio.

The invention belongs to the technical field of hard carbon materials, and particularly relates to a preparation method and application of a polyurethane-based hard carbon material. The preparation method comprises the following steps: carrying out roasting carbonization and post-treatment on a solid polyurethane material at 900-1400 DEG C to obtain a powdery polyurethane-based hard carbon material; the solid polyurethane material is a polyurethane product prepared from reaction raw materials including isocyanate, non-phosphorus-containing polyol and phosphorus-containing polyol through a reaction. According to the invention, the polyurethane material is prepared by adding the phosphorus-containing polyol, and the polyurethane material is applied to the field of batteries as a negative electrode raw material, so that high carbonization yield can be maintained, and excellent performances such as initial coulombic efficiency, energy density, cycle capacity retention rate and the like of the battery can be realized.

The application relates to a sodium titanate nanofiber / reduced graphene oxide composite electrode material and a preparation method and application thereof. The composite electrode material has a two-dimensional sheet structure, the particle size is 1-6 mu m, the thickness is 10-20 nm, is composed of a few-layer reduced graphene oxide and sodium titanate nanofibers with a diameter of 5-10 nm loaded on the reduced graphene oxide, and is prepared by taking the few-layer reduced graphene oxide as a template, uniformly loading titanium dioxide particles, and then carrying out hydrothermal treatment in an alkali solution. Compared with the prior art, the synthesis method is simple in process, easy to scale up, and high in controllability. As a negative electrode of a sodium ion battery or a positive electrode of a sodium battery, the sodium titanate nanofiber / reduced graphene oxide composite electrode material has the advantages of high initial coulomb efficiency, low working voltage, high capacity, excellent rate characteristics and cycle stability, and has a broad market application prospect.

The present application provides a carbon material, a preparation method therefor and the use thereof, a negative electrode plate, a secondary battery, and a power consuming device. The carbon material comprises a porous carbon substrate and an amorphous carbon layer provided on at least part of a surface of the porous carbon substrate. When the carbon material is used as a negative electrode active material, it can make full use of the abundant porous structures in the porous carbon substrate for lithium / sodium precipitation or lithium / sodium intercalation and avoid the side reactions due to the contact between the abundant active sites on the surface of the porous carbon substrate and an electrolyte solution, such that the initial coulombic efficiency and the actual capacity of a secondary battery can be improved.

The invention provides a preparation method of a negative electrode active material, the negative electrode active material, a negative electrode plate and a secondary battery. The preparation method comprises the following steps: obtaining a precursor; pre-treating the precursor to obtain a pre-treated material; carrying out carbonization treatment on the pretreated material to obtain a negative electrode active material; the precursor comprises saccharides containing a furan ring structure and a zinc source; in the carbonization treatment process, a C-O-Zn intermediate structure is formed. The negative electrode active material prepared by the preparation method has higher specific capacity and more excellent rate capability, and the preparation method is simple in process, low in cost and easy for large-scale production.

This invention relates to the field of battery technology, specifically to a composite anode material, its preparation method, and its applications. A composite anode material includes a carbon material matrix and a coating layer disposed on the surface of the carbon material matrix. The coating layer contains amorphous carbon and a dual-conductor composite. The dual-conductor composite has a core-shell structure, with the core layer containing a carbon-based conductive agent and the shell layer containing a fast-ion conductor. The composite anode material of this invention, through the synergy of the various layers, can further improve the fast-charging performance of the anode material and enhance the battery's capacity and cycle performance.

The invention discloses a nitrogen-doped silicon-oxygen-carbon negative electrode material of a lithium ion battery as well as a preparation method and application of the nitrogen-doped silicon-oxygen-carbon negative electrode material, and belongs to the technical field of negative electrode materials of lithium ion batteries. The preparation method of the nitrogen-doped silicon-oxygen-carbon material comprises the following steps: carrying out acidic hydrolytic condensation reaction on gamma-methacryloxypropyltrimethoxysilane, and carrying out rotary evaporation, washing and drying to obtain a polysiloxane precursor; and performing high-temperature pyrolysis on the polysiloxane precursor in a nitrogen-containing atmosphere to obtain the nitrogen-doped silicon-oxygen-carbon negative electrode material. According to the nitrogen-doped silicon-oxygen-carbon negative electrode material for the lithium ion battery, the content of nitrogen in silicon-oxygen-carbon is controlled by adjusting conditions such as pyrolysis atmosphere, pyrolysis temperature and pyrolysis time, so that lithium ion storage sites are innovatively enriched from the atomic scale, and the ion and electron transmission capability of the silicon-oxygen-carbon material is improved; therefore, the electrochemical properties such as the first-circle coulombic efficiency, the reversible capacity, the rate capability and the long cycle stability of the silicon-oxygen-carbon material are remarkably improved.

The application discloses a kind of sodium iron silicate negative materials and preparation method thereof.The method uses phosphating by-product silicon slag as silicon source, uses iron salt and sodium salt as raw material, uses template agent and solvent as auxiliary, and obtains the irregular spherical particle sodium iron silicate negative material by sol-gel method combined with stepwise heating calcination process.The application realizes high-value utilization of phosphating solid waste, and the prepared material has stable structure and exhibits high reversible capacity and excellent cycle stability when used as sodium-ion battery negative material.The method is simple, green and environmentally friendly, and low in cost, suitable for industrial production.

This invention discloses a composite cathode material for lithium-ion batteries and its preparation method, belonging to the field of lithium-ion battery technology. The chemical formula of the composite cathode material is A. 1₋δ B δ 0

The invention relates to the technical field of sodium ion battery material preparation, in particular to a high-performance hard carbon negative electrode material and a preparation method and application thereof.The preparation method comprises the following steps that S1, porous carbon and liquid asphalt are mixed, a binder, a conductive agent and a dispersing agent are added, and an active substance is obtained; and S2, performing ball milling on the active substance, coating the surface of a copper foil with the active substance, drying, covering the surface of the active substance with a layer of copper foil to form a copper foil-active substance-copper foil structure, and performing high-temperature calcination to obtain the high-performance hard carbon negative electrode material. The hard carbon negative electrode material prepared by the method shows relatively high reversible capacity and first coulombic efficiency in the sodium-ion battery, has good cycling stability, and is beneficial to large-scale production of the sodium-ion battery negative electrode material.

The invention relates to a lithium metal-iron sulfide battery and a preparation method thereof. An active material of a positive electrode is FeS2 or carbon-coated FeS2; the negative electrode is made of metal lithium or lithium alloy; the electrolyte is a solvent-free inorganic molten salt electrolyte and is formed by mixing LiFSI and KFSI, the molten salt electrolyte is in a solid state at normal temperature, and when the temperature rises to 60 DEG C or above, the molten salt electrolyte is molten to form a liquid ionic conductor; and the working temperature range of the metal lithium-iron sulfide battery is 70-200 DEG C. The electrolyte disclosed by the invention does not contain any organic solvent, the safety risk of thermal runaway caused by flammable and combustible traditional liquid organic electrolyte is fundamentally eradicated, and the battery can stably work under the medium-high temperature working condition of 70-200 DEG C in cooperation with the FeS2 or carbon-coated FeS2 positive electrode active material, the metal lithium or lithium alloy negative electrode and the medium-high temperature resistant diaphragm; and finally, synergistic improvement of high safety, excellent high-temperature stability, high reversible capacity and long cycle life of the battery is realized.

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 application discloses a kind of multi-lithium salt composite organic electrolyte suitable for low temperature environment, comprising: lithium salt system and organic solvent system;Wherein, the lithium salt system includes lithium tetrafluoroborate, lithium bisfluorosulfonylimide and lithium bis (oxalate) borate;Organic solvent system includes carbonate solvent, linear ether solvent and weak solvent molecule;The application aims at providing a kind of multi-lithium salt composite organic electrolyte suitable for low temperature environment, can have good ion transport capacity, interface stability and cycle life under low temperature environment, can maintain higher reversible capacity and stable charge-discharge platform, capacity decay rate is significantly slowed down, meet the application demand of high reliability and high stability of low temperature lithium ion battery.

The application belongs to the technical field of secondary battery materials, and specifically discloses a multi-atom doped carbon nanofiber as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving polyacrylonitrile, a sulfur source and a phosphorus source in N,N-dimethylformamide to prepare a precursor solution, obtaining a nanofiber membrane through electrospinning, and then performing pre-oxidation and high-temperature carbonization treatment, and obtaining the multi-atom doped carbon nanofiber after cooling. The carbon nanofiber is overlapped with each other to form a three-dimensional network structure, provides a conductive carbon skeleton, and improves ion and electron migration efficiency and rate performance; the heteroatom doping introduces rich pore structures and ion active adsorption sites, and cooperatively improves reversible capacity; uniform stress distribution of the carbon skeleton helps to stabilize the electrode interface and prolong the cycle life. The method has simple process, can precisely control the material morphology and composition, and has strong operability.

This application provides an amino- and tertiary-amine-modified triazine hard carbon porous material, its preparation method, and an anode. Using tris(4-aminophenyl)amine and 4-amino-3,5-dibromobenzonitrile as raw materials, acetonitrile as solvent, and CuI as catalyst, NH2-SL is synthesized via a Ullmann reaction. The mixture is then reacted in a tube furnace at 450℃ for 40 h to synthesize CTF-NH2 containing an imine structure. Subsequently, high-temperature calcination is performed to synthesize NH2-1000. The triazine porous framework obtained in this application exhibits excellent physicochemical stability, high nitrogen content, and high porosity. Compared to the material before calcination at 1000℃, the interplanar spacing of the hard carbon porous material increases by 0.0034 nm, which is more conducive to sodium ion insertion and extraction. Therefore, the prepared NH2-1000, as a sodium-ion battery anode, demonstrates a high reversible capacity of 209.1 mAh / g in a 2A / g rate performance test, making it widely applicable as a secondary battery anode material.

The application discloses a preparation method of a biomass hard carbon negative electrode material, and comprises the following steps: (1) pre-carbonizing a biomass raw material, and then uniformly mixing the pre-carbonized biomass raw material with an alkali solution to obtain wet material; (2) high-temperature carbonizing the wet material in an inert atmosphere, and then rapidly cooling the high-temperature carbonized wet material to obtain carbonized biomass; the cooling rate is controlled to be 10-30 DEG C / min during the rapid cooling; and (3) physically stripping the crystalline substances on the surface of the carbonized biomass, and then crushing the carbonized biomass to obtain the biomass hard carbon negative electrode material. The biomass hard carbon needs high-temperature carbonization during processing, and the high-temperature carbonization process is used for impurity removal, so that the energy consumption is not additionally increased. The impurities are separated by using a physical method, and the process is simple and environment-friendly. Overall, the material prepared by the method has low impurity content, excellent sodium storage performance, low energy consumption in the preparation process, simple process and environment-friendly.

The invention discloses a negative electrode material, a preparation method thereof and a secondary battery. The negative electrode material comprises an inner core and a shell layer formed on the outer side of the inner core. The inner core comprises nanometer silicon and a silicon oxide compound, and the mass fraction of the silicon element is increased from 25%-38% to 70%-85% from the outer side of the inner core to the center of the inner core. The shell layer is formed on the outer side of the inner core, the shell layer comprises a nano-silicon substrate and a nano-composite dispersed and distributed on the nano-silicon substrate, and the nano-composite comprises magnesium oxide and magnesium silicate. According to the negative electrode material provided by the invention, the shell layer containing the magnesium oxide / magnesium silicate nano-composite is constructed, and the gradient structure with the silicon content gradually increasing from outside to inside is formed in the inner core region, so that the negative electrode material can effectively inhibit side reactions in the first lithium intercalation process, the active lithium loss is reduced, and the structural integrity of the shell layer is maintained; therefore, the first coulombic efficiency is remarkably improved, and the cycling stability is improved.

The application discloses a composite negative electrode material and a preparation method thereof, a negative electrode sheet and a lithium ion battery, and belongs to the technical field of lithium ion batteries.The composite negative electrode material comprises a core and a coating layer located on the surface of the core; the core comprises a carbon matrix and a filling material, the carbon matrix has a first pore, and the filling material is at least partially distributed in the first pore; and the filling material comprises SiOx, and the filling material has a second pore.The composite silicon negative electrode composite negative electrode material can effectively reduce the volume effect and improve the cycle stability.

This invention belongs to the field of electrochemical power source technology, and relates to a multi-metal ion-substituted V site M x V₂O₅ materials, their preparation methods, and applications. The preparation steps are as follows: Citric acid monohydrate, anhydrous oxalic acid, and ammonium metavanadate are sequentially added to deionized water and stirred until completely dissolved to obtain a first solution; citric acid monohydrate and a salt containing metal cation M are added to deionized water and stirred until the salt containing metal cation M is completely dissolved to obtain a second solution; the two solutions are mixed evenly and reacted under a preset temperature to form a gel-like product; the gel-like product is dried to obtain a precursor dry gel; then, after grinding and high-temperature annealing, M is obtained. x V₂O₅ material. The M x When V2O5 is used as a cathode material for lithium-ion secondary batteries, it exhibits excellent reversible capacity and cycle stability, and eliminates the problems of voltage drop and poor cycle stability of traditional V2O5 during discharge.

This invention relates to the field of electrochemical technology, and discloses a negative electrode active material and its preparation and application, as well as a sodium-ion battery negative electrode material and sodium-ion battery negative electrode and its application. The method includes the following steps: (1) mixing a petroleum-based material and a hard carbon precursor with a solvent to obtain a mixed slurry; (2) drying the mixed slurry obtained in step (1); (3) pretreating and carbonizing the product of step (2) at high temperature to obtain the negative electrode active material; wherein, the mass ratio of the petroleum-based material and the hard carbon precursor in step (1) is 0.1-4:1. The preparation method of this negative electrode active material adopts a composite method of petroleum-based material and hard carbon precursor, which is simple to prepare and easy to scale up industrially; at the same time, it combines the advantages of both materials, improves the overall carbon production rate, and can achieve a combined improvement in the reversible capacity and first-cycle coulombic efficiency of sodium-ion battery negative electrode.

The application provides a preparation method of a molybdenum ion pre-embedded molybdenum vanadium sulfide heterojunction rich in sulfur defects, comprising the following steps: step 1, dissolving C2H5NS in ethylene glycol to obtain solution A; step 2, dissolving a vanadium source in deionized water to obtain solution B; step 3, mixing solution A obtained in step 1 with solution B obtained in step 2, and then reacting at 70-160 DEG C for 30-120 min, and then naturally cooling to room temperature after the reaction is completed to obtain solution C; step 4, adding a molybdenum source into solution C obtained in step 3, and then obtaining solution D after ultrasonic oscillation, and then transferring solution D into a reaction kettle, and then performing hydrothermal reaction at 160-180 DEG C for 16-20 h, and then naturally cooling to room temperature after the reaction is completed, and then obtaining the molybdenum ion pre-embedded molybdenum vanadium sulfide heterojunction rich in sulfur defects after washing and drying. The method of the application controls VS4 through internal surface interface regulation, provides a novel electrode material for a water-based zinc ion battery, greatly improves the reversible capacity of the battery, and prolongs the cycle life of the battery.

The application relates to a sodium-ion battery positive electrode material, a manufacturing method thereof, a positive electrode sheet and a battery. The positive electrode material comprises a first component material and a second component material, the first component material is a polyanion material, the second component material is one or more of a polyanion material and / or a layer oxygen material, and the discharge platform voltage of the first component material is less than that of the second component material; the second component material is coated on the surface of the first component material, or the first component material is coated on the surface of the second component material, or the second component material and the first component material coexist in a graded manner. The application also provides a positive electrode sheet, which comprises a current collector and a first coating layer and a second coating layer arranged in sequence, the first coating layer comprises the first component material, and the second coating layer comprises the second component material. The application controls the voltage, particle size and ratio of the two component materials, so that the positive electrode material has both energy density and cycle stability.

The present application relates to the technical field of aqueous manganese ion energy storage, and particularly relates to a preparation method of an aqueous manganese ion energy storage device capable of temperature difference charging, and the preparation steps comprise the following steps: S1, mixing a manganese triflate solution and a manganese perchlorate solution to obtain an electrolyte; S2, mixing bismuth telluride, acetylene black and polyvinylidene fluoride to prepare a slurry, coating the slurry on cut graphite paper, and drying to obtain a bismuth telluride positive electrode; S3, ultrasonicating and drying a metal foil to obtain a negative electrode; and S4, assembling the electrolyte, the positive electrode and the negative electrode to obtain the energy storage device. The present application improves the cycle stability of the positive electrode of the manganese ion energy storage device, enables the manganese ion energy storage device to have high reversible specific capacity and long cycle life, and exhibits excellent electrochemical performance.

This invention discloses a biomass composite material for sodium-ion battery anodes and its preparation method, belonging to the field of sodium-ion battery technology. The composite material comprises 90-98 parts of biomass-based hard carbon and 2-10 parts of bismuth / antimony salt solution or bismuth / antimony oxide, and its preparation method is provided. This invention uses low-cost natural agricultural / industrial waste as a carbon source and bismuth / antimony or its compounds as important active materials. First, a porous carbon structure is formed through pre-carbonization. Then, bismuth / antimony or its compounds are mixed with the carbides. Next, bismuth / antimony is tightly encapsulated with carbon using medium-temperature pitch and activating gases, forming a bismuth / antimony core-shell composite material. This method introduces bismuth / antimony at low cost, improving the electrochemical activity of the hard carbon material, while simultaneously utilizing the carbon coating to suppress system expansion during sodium storage of bismuth / antimony, thus enhancing the material's stability. The method is simple, the composition is easily adjustable, the performance is high, and it has wide applications and promising prospects.

This application provides an amino- and tertiary-amine-modified triazine hard carbon porous material, its preparation method, and an anode. Using tris(4-aminophenyl)amine and 4-amino-3,5-dibromobenzonitrile as raw materials, acetonitrile as solvent, and CuI as catalyst, NH2-SL is synthesized via a Ullmann reaction. The mixture is then reacted in a tube furnace at 450℃ for 40 h to synthesize CTF-NH2 containing an imine structure. Subsequently, high-temperature calcination is performed to synthesize NH2-1000. The triazine porous framework obtained in this application exhibits excellent physicochemical stability, high nitrogen content, and high porosity. Compared to the material before calcination at 1000℃, the interplanar spacing of the hard carbon porous material increases by 0.0034 nm, which is more conducive to sodium ion insertion and extraction. Therefore, the prepared NH2-1000, as a sodium-ion battery anode, demonstrates a high reversible capacity of 209.1 mAh / g in a 2A / g rate performance test, making it widely applicable as a secondary battery anode material.