33results about How to "Excellent discharge specific capacity" patented technology

The invention discloses a high-temperature type lithium manganate anode material for a power lithium ion battery. The high-temperature type lithium manganate anode material consists of a core material as shown in a formula Li1+xMn2-y-zAyQzO4, and a coating layer on the surface of the core material, wherein the coating layer is one or more of cobaltosic oxide, aluminum oxide and nickel protoxide. The anode material is excellent in high-temperature property, and is good in specific discharge capacity, capacity retention ratio and electrochemical circulation property at high temperature. In addition, the preparation method of the anode material disclosed by the invention is simple in production process, easy to achieve and low in cost, and can be applied to large-scale industrialization production.

The present invention belongs to the field of lithium-ion batteries, and provide a modified lithium-ion battery positive electrode material LiNi1-xCoxO2@LiAlO2 with high thermal-stability LiAlO2 coated on the LiNi1-xCoxO2 surface, and a preparation method thereof. A purpose of the present invention is to overcome the disadvantages of overcharging intolerance and pool thermal-stability of the lithium-ion battery LiNi1-xCoxO2 (x is more than 0 and is less than or equal to 0.5) positive electrode material. According to the present invention, the positive electrode material of the present invention has characteristics of good thermal-stability, good discharge specific capacity and excellent cycle stability compared with the LiNi1-xCoxO2 positive electrode material, can meet the large rate charge and discharge requirements, and is especially suitable for the positive electrode material of the electric vehicle power battery; and the product prepared through the preparation method has characteristics of high purity, high chemical uniformity, good coating effect, high crystal quality, fine particle, uniform distribution, excellent electrochemical performance and low manufacturing cost.

The invention discloses a lithium ion battery positive electrode material lithium iron manganese phosphate which has a general chemical formula of LiFe1-xMnxPO4, wherein x is equal to 0.2-0.8. The liquid phase preparation method of the lithium ion battery positive electrode material lithium iron manganese phosphate comprises the following steps: synthesizing a precursor, namely weighing an iron salt, a manganese salt and oxalate according to a molar ratio, preparing a solution A from the iron salt, the manganese salt and an antioxidant, preparing the oxalate into a solution B, and preparing ammonia water into a solution C; measuring the solution B to serve as a base solution; simultaneously dripping the solution A and the solution C, and dripping the solution B; filtering, washing and performing vacuum drying, thereby obtaining an iron manganese oxalate precipitate precursor; dosing, namely weighing a carbon source, adding a lithium source, the precursor and a phosphorus source, mixing and performing ball-milling; compounding, namely adding the mixed materials into a compounding furnace, and treating the materials for calcining; and sintering, namely controlling the temperature rise rate, and performing furnace cooling on the compounded precursor powder to room temperature under the protection of inert gas atmosphere, thereby obtaining the carbon-coated lithium iron manganese phosphate positive electrode material.

The invention relates to a lithium-rich manganese-based cathode material coated with a composite carbon material derived from a COFs material containing at least one element of N and B, and a preparation method thereof, and a lithium battery, wherein the surface of the lithium-rich manganese-based cathode material is coated with a composite carbon material. The lithium-rich manganese-based cathodematerial coated with the composite carbon material can obviously improve the conductivity of the material and the rate performance and cycle performance of the battery containing the composite carbonmaterial, and the composite carbon material is coated more uniformly. The invention adopts a simple one-step carbonization method to prepare a composite porous carbon material coated with a lithium-rich manganese-based cathode material, the prepared porous carbon has controllable specific surface area and pore size, and the preparation method is simple and efficient, and is suitable for large-scale preparation and synthesis.

The invention relates to a triazine covalent organic framework material rich in allyloxy as well as a preparation method and application of the triazine covalent organic framework material. The material is formed by continuously splicing 5-allyloxy isophthalaldehyde and 4,4',4''-(1,3,5-triazin-2,4,6-triyl)triphenylamine through a condensation reaction, and the unit structural formula of the material is shown in the specification. According to the preparation method, aldehyde with an allyloxy group and amine with a triazine group are subjected to a traditional Schiff base reaction, and synthesis of the covalent organic framework material arranged in order is achieved. The material obtained by the invention has an allyloxy group and a triazine group, can significantly improve the cycle performance of the lithium-sulfur battery, and has a good application prospect.

The invention relates to a zwitter-ion-rich covalent organic framework material as well as a preparation method and application thereof. The covalent organic framework material is prepared by taking 3, 8-diamino-6-phenyl phenanthridine and benzenetricarboxaldehyde as raw materials and introducing sulfo groups through a post-modification method. According to the invention, sulfo groups are introduced to a COF skeleton, so that the COF skeleton has positive and negative charges; wherein positively charged nitrogen atoms and negatively charged sulfo groups not only can inhibit the loss of an active substance sulfur in the lithium-sulfur battery, but also can promote the catalytic conversion of polysulfide, so that the cycle performance of the lithium-sulfur battery can be remarkably improved.

The invention discloses a nano-scale cube CoSnO<3> and graphene composite material. The composite material is characterized in that nano-scale cube CoSnO<3> and gauzy graphene form a coating structure. The nano-scale cube CoSnO<3> and graphene composite material is prepared by a simple and easy method, wherein the nano-scale cube CoSnO<3> is uniformly coated with graphene, and by virtue of graphene coating, the conductivity of the CoSnO<3> material is greatly improved; meanwhile, volume expansion of the CoSnO<3> material is also relieved, and pulverization and falling off of the electrode material are also suppressed effectively; and therefore, when the nano-scale cube CoSnO<3> and graphene composite material prepared in the invention is used as the negative electrode material of a sodiumion battery, excellent discharge specific capacity and stable cycle performance are represented.

The invention relates to a porous metallic cathode material doped with lithium manganate/carbon for composite lithium batteries, and a preparation method of the porous metallic cathodmaterial. The preparation method comprises the following steps: dissolving a surfactant in absolute ethyl alcohol, and stirring the surfactant and the absolute ethyl alcohol so as to obtain gel; adding lithium nitrate, and nitrate mixed with metal nitrate and manganese in the obtained gel, and performing uniform stir; after uniformly mixing, drying the mixture in a blast drying box, and further calcining the dried mixture in a muffle furnace so as to obtain the porous material doped with lithium manganate LiM0.2Mn1.8O4; dissolving the LiM0.2Mn1.8O4 in glucose solution, enabling the LiM0.2Mn1.8O4 to uniformly disperse, and after performing air blast drying, calcining the dried product in nitrogen atmosphere so as to obtain the metallic composite material LiM0.2Mn1.8O4/C doped with lithium manganate/carbon, wherein M refers to the doped metal. Compared with the prior art, the porous metallic cathode material prepared through the preparation method disclosed by the invention has the advantages that the crystallizing property is good, the particle size is about 20nm, and the material has good specific discharge capacity, rate capability and cycling properties as the cathode material for lithium batteries. The preparation idea of the preparation method disclosed by the invention can be applied to the preparation of other cathode materials of composite materials of porous metallic oxides.

The invention aims to provide a sulfur-doped carbon material with relatively high discharge specific capacity. The thickness of a carbon layer of the sulfur-doped carbon material is 20-300 nanometers, and the sulfur content accounts for 3-20wt%. Meanwhile, the invention also discloses a preparation method of the sulfur-doped carbon material. The sulfur-doped carbon material provided by the invention has relatively high discharge specific capacity.

The invention relates to a lithium ion battery positive electrode material and a preparation method thereof. The positive electrode material comprises a porous carbon sphere and a lithium cobalt phosphate material, wherein the lithium cobalt phosphate material is arranged in the porous carbon sphere, the peak intensity of X-ray diffraction peak of the lithium cobalt phosphate material conforms to the following: I<200>/I<131> is less than 1.5 but more than 0.8, the average grain size of the porous carbon sphere is 0.8-10 micrometers, the pore volume of the porous carbon sphere is (0.01-0.1) cm<3>/g and the carbon content of the positive electrode material is 2-10%. The lithium cobalt phosphate material obtained by employing the preparation method is uniform in particle size and excellent in electrochemical characteristics such as discharge specific capacity and cycle capacity retention ratio.

The invention provides a zinc cathode material of a nickel-zinc battery as well as a preparation method and application of the zinc cathode material. The zinc cathode material of the nickel-zinc battery comprises ZnXnO4 and ZnO, wherein ZnXnO4 accounts for 0.5-5% of the amount of total substances of the zinc cathode material; X is Fe and/or Co; n is equal to 1 or 2. The preparation method comprises the following steps: preparing a salt solution from one or two of ferric salts and cobalt salts together with one of zinc salts, preparing a precipitant from one or two or more of sodium hydroxide, sodium carbonate, urea and ammonia water, stirring the salt solution and the precipitant, dripping into a water bath environment, performing hydrothermal reaction on the titrated mixed liquid for 8-12 hours at 100-150 DEG C, and finally performing suction filtration, washing and drying to obtain the zinc cathode material. The zinc cathode material provided by the invention can be mixed with carbon powder, polytetrafluoroethylene and carboxymethyl cellulose sodium so as to prepare the zinc negative electrode of the nickel-zinc battery. The zinc cathode material of the nickel-zinc battery is relatively high in specific capacity, and the circulation stability of the nickel-zinc battery is improved.

The invention relates to a lithium ion battery cathode material and a preparation method and application thereof. The preparation method comprises the following steps: ball milling the cathode raw material and dispersing it in a solvent to obtain a suspension; A graphene electrode and a metal electrode are placed in a suspension and an electric field is applied between the two electrodes, whereinthe graphene electrode is used as an anode and the metal electrode is used as a cathode; Taking out the graphene electrode and drying to obtain the cathode material of the lithium ion battery; The preparation method has simple process and is easy to be produced on a large scale. Moreover, the cathode material prepared by the preparation method has excellent electrochemical performance and high rate charge-discharge performance.

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a carrier material for a positive electrode of a lithium-sulfur battery and a preparation method of the carrier material. The carrier material is an Nb-Nb4N5 composite material with a one-dimensional mesoporous nanobelt array, and the specific discharge capacity, the cycling stability, the rate capability and the cycle life of the lithium-sulfur battery can be remarkably improved when the carrier material is used for the positive electrode of the lithium-sulfur battery.

The present invention discloses a composite polymer separator which is composed of a polyolefin-based separator and coating film on the polyolefin-based separator. The coating film is composed of the following raw materials, by mass: 5-10 parts of PVDF, 90-120 parts of NMP, and 0.1-3 parts of SiO2. A preparation method for the composite polymer separator comprises the following steps: 1) uniformly mixing the various raw materials to give a film-forming solution; 2) coating the film-forming solution on the surface of the polyolefin-based separator to obtain a wet separator; 3) performing soaking treatment in water to the wet separator; and 4) removing the wet separator and drying. The separator prepared in the invention had good permeability, good mechanical properties, and strong resistance to high temperature. After battery tests, the battery made by using the separator of the present invention has a voltage platform, a specific discharge capacity and cycle performance better than those of a battery made by using a commercial separator; and the preparation method of the separator is simple, thereby saving manufacturing cost.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery anode material and a preparation method thereof. Nickel sulfide, indium sulfideand graphene are compounded as a negative active substance, and an anode material with high charge-discharge specific capacity and good cycling performance is obtained.

The invention discloses a preparation method of a lithium ion battery composite material with a double-shell structure, which comprises adding cobalt nitrate hexahydrate into N,N-dimethylformamide, and then dissolving by ultrasonic to obtain a solution I, and then adding 2,5-dihydroxyterephthalic acid was added to the absolute ethanol solution, and ultrasonically dissolved to obtain solution II. After the solutions I and II were mixed and stirred, distilled water was added and then moved to a polytetrafluoroethylene reaction kettle. React at ℃ for 24-30 h, and cool to obtain metal-organic framework Co-MOF-74, adding copper nitrate trihydrate to methanol solution, ultrasonically dissolving, adding metal-organic framework Co-MOF-74 in step S1, magnetically at room temperature Stir for 3 to 6 hours, then add citric acid to sonicate, move to a polytetrafluoroethylene reactor, react at 60 to 80 °C for 3 to 5 hours, cool, filter, and dry; place the dried product in a tube furnace, In an air atmosphere, the temperature is raised to 580-520°C at a heating rate of 5-8°C/min, maintained at this temperature for 4-7 hours, and then brought to room temperature at a rate of 0.5-1.2°C/min to obtain the composite material.

The invention discloses a preparation method of a high-capacity and high-stability lithium ion battery negative electrode material, which comprises the following steps: carrying out heat treatment on petroleum coke at 300-350 DEG C for 3-6 hours, then carrying out grinding treatment, and keeping the particle size of the ground powder at 5-10 microns to obtain a product for later use; s2, mixing the product in the step S1 with sodium peroxide or potassium peroxide, stirring for 0.5-2 hours at room temperature, adding distilled water, reacting for 2-4 hours, drying the solid, adding into a tubular furnace, and performing secondary heat treatment for 10-15 hours at the temperature of 700-800 DEG C under the air condition for later use; and graphitizing the product obtained in the step S2, graphitizing and calcining the product for 15-20 hours under the atmospheric condition of 2500-3000 DEG C, cooling, grinding, controlling the particle size of the product to be 3-6 microns, mixing the product meeting the particle size requirement with sodium peroxide or potassium peroxide according to the mass ratio of 1: (0.02-0.03), dropwise adding distilled water until the product is viscous, stirring, standing for 0.5-2 hours, and drying to obtain the negative electrode material.