58results about How to "Good cycle reversibility" patented technology

The invention discloses a recycling method for a graphite anode material from a waste lithium-ion battery, and belongs to the technical field of recovering of materials from the waste lithium-ion battery. According to the main points of the technical scheme, the method comprises the following steps: carrying out soaking pretreatment on the graphite material recovered from the waste lithium-ion battery; carrying out ball-mill mixing on pre-calcined and separated graphite powder and a ferrous oxalate or zinc oxalate or ferrous oxalate and zinc oxalate mixture evenly; and finally preparing the battery-grade graphite anode material through high-temperature treatment. The graphite anode material prepared by the method has excellent electrochemical activity and cyclic reversibility; the discharge capacity at 0.2C reaches over 400mAh/g; and the capacity retention rate after 50 cycles is greater than 98.0%. The recycling method can efficiently recover the graphite anode material from the waste lithium-ion battery, further improves the electrical property and achieves recycling of the graphite anode material.

The invention relates to the technical field of new energy materials, and in particular to a vanadium disulfide/graphene composite material and a preparation method therefor. The preparation method comprises the following steps: dissolving a vanadium source into water and uniformly mixing with an excessive amount of sulfur source to obtain a mixed solution A, uniformly mixing graphene oxide with the mixed solution A, performing reaction at the temperature of 150-200 DEG C, and after the reaction to obtain the vanadium disulfide/graphene composite material. The preparation method is simple in process, mature in technology, available in equipment and quite good for the commercial promotion; according to the prepared vanadium disulfide/graphene composite material, the shortcomings of the vanadium disulfide and graphene are overcome by each other; the chemical activity of the material is improved, and the vanadium disulfide/graphene composite material can be used as the chemical active material to be applied to lithium ion battery negative electrodes; and the obtained lithium ion battery is quite good in circulation reversibility and relatively high in specific capacity.

The invention discloses a preparation method and application of a layered high-entropy oxide sodium ion battery positive electrode material and belongs to the field of sodium ion battery positive electrode materials. The material is a Na (Fe(1-x)/5Co(1-x)/5Ni(1-x)/5Sn(1-x)/5Ti(1-x)/5)LixO2 high-entropy oxide sodium ion battery positive electrode material, and x is equal to 0 or 0.1 or 1/6. The material prepared by the invention has the structural advantages of single phase, good crystallinity, small particle size, uniform distribution and the like, and by doping alkali metal elements, ionic and electronic conductivity of the material is effectively improved, the charge transfer impedance is greatly reduced, and the rate capability is improved. Under the current density of 10mA/g, the firstreversible specific capacity of the material is 80-120mAh/g; under the current density of 50 mA/g, the specific capacity reaches 40-100 mAh/g after 200 cycles, and the capacity retention ratio is larger than or equal to 58%.

The invention discloses a method for recycling a lithium iron phosphate positive electrode material in a waste lithium ion battery, belonging to the field of recovery technologies for lithium iron phosphate positive electrode materials in waste lithium ion batteries and the field of alkaline secondary batteries. According to a technical scheme in the invention, the lithium iron phosphate positive electrode material in the waste lithium ion battery is used as a raw material and uniformly mixed with a ferric salt and an organic additive so as to obtain a mixture; then the mixture is subjected to calcining in an inert atmosphere so as to prepare a lithium iron phosphate-based composite material; and the lithium iron phosphate-based composite material is used for preparation of the negative electrode of an alkaline secondary battery. The method provided by the invention can efficiently recycle waste lithium ion battery positive electrode materials and apply the recycled waste lithium ion battery positive electrode materials to the negative electrode of an alkaline secondary battery, so cyclic regeneration and utilization of the waste lithium iron phosphate material are realized.

The invention discloses a method for preparing three-dimensional graphene-phosphotungstate, and belongs to the technical field of chemical batteries. The method comprises the following steps of: mixing a rubidium chloride solution and a phosphotungstic acid solution to react so as to obtain rubidium phosphowolframate; mixing the rubidium phosphowolframate and a graphene oxide solution, performing hydrothermal reaction, after the reaction is completed, cooling to the room temperature, taking out solid substances, and performing freeze-drying, thereby obtaining three-dimensional graphene-phosphotungstate. The method disclosed by the invention is simple, the prepared rubidium phosphowolframate is relatively small in size, uniform in morphology and beneficial to solve the problem that lithium ions are hard to embed and desorb from microcrystalline structures, and can be applied to cathode materials of lithium batteries, and conductivity of a heteropolyacid molecular cluster battery can be improved.

A method for preparing negative pole material of lithium cell, which contains putting silicon, carbon, doped 0.01 % rareearth oxide La2O5 and Nd2O5 in high power ball mill, protected by Ar or N2 for preventing oxidation, the C : Si = 3 :1 -5 : 1, checking the abrading grain size every 20 hr until to 50-100nm to obtain high specific capacity and fine safety nano negative pole material.

This invention discloses a method to prepare anode materials in lithium ion cells, which includes following steps: LiMxMn2-xO4 powder is adopted as substrate and mixed with low-melting-point salt powder to form a mixture. The melting point of low-melting-point salt is below 650 deg. C. In LiMxMn2-xO4, x is not less than 0.01 and not larger than 0.2 and M can be aluminium, cobalt, nickel or zincum. The metal amount in low-melting-point salt is 2~8wt% of LiMxMn2-xO4. The preceding mixture is pressed into blocks at a pressure of 4~8MPa. The blocks are kept first at 90~120 deg. C for 2~4.0 hours and then at 400~700 deg. C for 2~6.0 hours. Lithium ion cells which adopt anode materials prepared in this invention have relatively high capacitance and perform good circulative properties in wide potential ranges.

The invention discloses a method for recycling a waste lithium iron phosphate positive electrode material and applying the recycled waste lithium iron phosphate positive electrode material to a nickel-iron battery, belonging to the field of recovery technologies for lithium iron phosphate positive electrode materials in waste lithium ion batteries and the field of alkaline secondary batteries. According to a technical scheme in the invention, the waste lithium iron phosphate positive electrode material is used as a raw material; a saturated ferric salt solution is added into and uniformly mixed with the waste lithium iron phosphate positive electrode material; then the obtained mixture is subjected to calcining in an inert atmosphere so as to prepare a lithium iron phosphate-based composite material; and the lithium iron phosphate-based composite material is used for preparation of the negative electrode of the nickel-iron battery. The method provided by the invention can efficiently recycle the waste lithium iron phosphate positive electrode material and apply the recycled waste lithium iron phosphate positive electrode material to the negative electrode of the nickel-iron battery, so cyclic regeneration and utilization of the waste lithium iron phosphate positive electrode material are realized.

The invention discloses a preparation method of nickel cobaltate. The preparation method comprises following steps: at a stoichiometric ratio, a nickel salt, a cobalt salt, a precipitating agent, anddeionized water are mixed; an obtained mixed solution is introduced into a reaction kettle, reaction temperature is controlled to be 100 to 125 DEG C for 6 to 8 h, and washing and drying are carried out so as to obtain a powdery mixed precursor; the powdery mixed precursor is subjected to heat treatment in the air so as to obtain the NiCo2O4 material. The NiCo2O4 material can be used for preparation of lithium ion battery anodes, and increasing of lithium battery rate capability.

A process of making an electrochromic or an electrolytic film by Ultrasonic Spray Pyrolysis (USP) deposition on a substrate comprising:

• • mixing a surfactant to an aqueous precursor solution comprising an electrochromic component or an electrolytic component to provide a spray solution;
  • introducing the spray solution into an ultrasonic spray deposition nozzle at a constant flow rate between 0.1 mL/min and 2 mL/min and applying an ultrasonic frequency between 80 and 120 kHz to generate atomized droplets of the precursor solution;
  • entraining the atomized droplets with a controlled jet of air as gas carrier at a pressure between 0.50 to 2.0 psi, onto a pre-heated substrate at a temperature of 200 to 450° C.;
  • thermally converting the atomized droplets when depositing onto the pre-heated substrate to generate an electrochromic or an electrolytic film.

This invention provides one lithium secondary battery anode and its process method, which comprises secondary anode composed of one base and two different compounds coating on different areas. The process method comprises the following steps: coating one compound onto anode base surface area different to basic materials; coating other compound different to basic materials on other part of the base surface to get lithium secondary battery anode of different basic material two compounds. This invention provides one lithium secondary battery composed of one anode, one cathode and one transmission isolation film.

The invention discloses a compound electrostatic spun diaphragm material with added dopamine modified aluminum sulfate. The compound electrostatic spun diaphragm material is made from, by weight, 80-83 parts of polyvinylidene fluoride, 20-22 parts of polymethyl methacrylate, an appropriate amount of DMF, 2-3 parts of nanometer boehmite, 0.8-1 part of silane coupling agent KH550, an appropriate amount of deionized water, an appropriate amount of trihydroxymethyl aminomethane, 2-3 parts of dopamine and 1-1.3 parts of aluminum sulfate. The dopamine solution reacts with aluminum sulfate, dopamine aggregates on the surface of aluminum sulfate, small and compact particles are formed on the surface of the aluminum sulfate, in this way, the porosity of the diaphragm is increased, a good hydrophilic property is achieved, and imbibing efficiency is further improved. The made diaphragm material has rich pore canals, conductive ions pass through the diaphragm material easily and especially transfer under high-magnification charging and discharging conditions, and the high-property superconductor diaphragm material is obtained.

The invention discloses a preparation technique of a composite film electrode used for a super capacitor; the preparation technique is characterized by comprising the following steps: pre-processing on high-purity metal tantalum foil with the purity of more than 99.95 percent: grinding and roughening, grinding and polishing, removing oil and cleaning to the metal tantalum foil; 2) electrodeposition technique; and 3) heat processing to the composite film electrode. The composite film electrode prepared by adopting the technique can reduce the using amount of noble metal ruthenium on the basis of guaranteeing capacitance characteristic, thus reducing the cost.

The invention provides a cross-linked network-shaped silicon-carbon negative electrode binder and a silicon-carbon negative electrode plate. The binder is obtained by thermal crosslinking of polyimideand polyvinyl alcohol, so that the binder has the advantages of high tensile strength of polyimide and strong capacity of inhibiting expansion of active substances, and can effectively improve the cycle reversibility of the charge-discharge lithium ion battery when being used for a silicon-carbon negative plate.

The invention discloses graphene heating ink, a preparation method and application thereof. The graphene heating ink comprises a resin matrix, conductive filler, an assistant and a solvent, wherein the conductive filler comprises graphene, the resin matrix is composed of an organic polymer and polysilazane in a mass ratio of 1:0.08-1.5, and the graphene heating ink further comprises a cross-linking agent; the preparation method comprises the following steps of: stirring and dispersing graphene in a powder form and polysilazane in a polysilazane solution form for fully mixing, and then adding the rest raw materials under stirring to obtain the graphene heating ink. The invention also relates to an electric heating film prepared from the ink, on the premise that excellent conductivity at a low temperature is guaranteed, the characteristic that the resistance is greatly improved at a high temperature is achieved, then self-temperature-limiting is achieved, meanwhile, when the electric heating film returns to a normal temperature, the resistance value of a material is not greatly changed, and reversibility is good, therefore, the recycling performance and the safety of the electric heating film are improved.

The invention relates to modified positive pole material of a magnesium secondary battery and a preparing method thereof. The positive pole material adopts quadrivalent magnesium molybdate modified by heteropoly acid, and the content of the quadrivalent magnesium molybdate is 85 percent to 99 percent and the content of the heteropoly acid is 1 percent to 15 percent according to mass percent. The chemical structural formula of the quadrivalent magnesium molybdate is Mg1 plus xMoO3, wherein x is larger than 0 and smaller than or equal to 0.1; and the preparing method of the positive pole material comprises the steps as follows: magnesium compound, molybdic compound and active carbon are adopted as raw materials, argon is taken as protective gas, quadrivalent magnesium molybdate powder is prepared after a high-temperature solid phase reaction method, and then the powder is modified through heteropoly acid, so that the positive pole material of the magnesium secondary battery is obtained.The positive pole material has good electrochemical charge-discharge behaviors, and compared with the ideal positive pole material Mo3S4 of the prior magnesium secondary battery, the preparing methodhas the advantages that the preparing method is simple, the cost is low, and the preparing method has high specific capacity, good circulating performance, reversibility, and obvious practical value and economic benefit.

The invention provides a lithium iron phosphate composite and a preparation method thereof. The preparation method of the lithium iron phosphate composite comprises the following steps of weighing a certain quantity of sodium benzene sulfonate, putting the sodium benzene sulfonate in a three-necked flask, thoroughly dissolving the sodium benzene sulfonate with 100ml deionized water, weighing a proper quantity of LiFe-PO4 and 1ml pyrrole, adding the LiFe-PO4 and the pyrrole in the three-necked flask, performing ultrasonic mixing for 1-3h, adding a proper quantity of Fecl3 solution under ice bath and nitrogen protection, performing electromagnetic stirring reaction for 6h, centrifugally washing an obtained product with the deionized water and ethanol for many times sequentially, and performing vacuum drying for 12h at the temperature of 60 DEG C to obtain the PPY/LiFePO4 composite. The lithium iron phosphate composite is high in tapping density, and thus the specific volumetric capacityof the LiFePO4 is increased.

The invention provides a mixed rare earth-magnesium metal hydride high-temperature heat storage material for solar heat collection power generation, which is characterized in that the composition is (Mm[1-y]Ay)Mgx, wherein Mm is cerium-rich mixed rare earth, A is one or two or more of Mn, Ca, Ti and B, 7<=x<=17, and 0<y<=0.2. Compared with the existing pure magnesium heat storage material, the novel mixed rare earth-magnesium heat storage material has the advantages of obviously improved activation property, obviously shorter activation time, excellent hydrogen absorption dynamic property, high hydrogen absorption rate and favorable hydrogen desorption dynamic property, and can ensure free hydrogen absorption and hydrogen desorption in the use process, thereby achieving the goal of energy storage. Compared with the existing pure magnesium heat storage material, the hydrogen absorption platform pressure of the material is lower under the condition of the same temperature, the 400-DEG C maximum hydrogen absorption amount is approximate to the hydrogen absorption amount of MgH2, and the platform hysteresis quality is not high. The mixed rare earth-magnesium metal hydride high-temperature heat storage material has favorable loop reversibility.

The invention discloses a cathodic electrochromic compound, and a relevant medium and a device thereof. The device is an electrochromic device containing the electrochromic medium, and the electrochromic medium comprises the cathodic electrochromic compound containing three or four quaternized pyridine rings. The voltage applied to the electrochromic device produced in the invention is adjusted to realize change among various colors.

The invention belongs to the field of wastewater treatment, and specifically discloses a C@Bi/rGO electro-adsorption composite active material, which comprises reduced graphene oxide and carbon-coatedbismuth elemental particles compounded on the surface of the reduced graphene oxide in situ. The invention further discloses preparation and applications of the composite active material. The invention further relates to an electrode compounded with the C@Bi/rGO, and preparation thereof, and applications in brine. According to the present invention, the composite active material can effectively solve the problems of poor stability, poor reversibility and the like of the material, and can effectively improve the high-adsorption capacity to halogens, excellent circulation stability and excellent regeneration stability in electro-adsorption of halogens.