44results about How to "Stable charging and discharging performance" patented technology

The invention provides a core-shell structure high nickel gradient nickel cobalt manganese aluminum quaternary positive electrode material and a preparation method thereof. The quaternary positive electrode material is spherical particles with an average particle size of 8-10 microns, the diameter of the inner core is 4-6 microns, the thickness of the shell layer is 2-3 microns and the surface ofthe shell layer is sheet-shaped. The nickel content gradually decreases from the center of the core to the surface of the shell structure, the manganese content gradually increases from the center ofthe core to the surface of the shell structure, the cobalt content is uniformly distributed and the aluminum content is uniformly or gradient distributed. The preparation method comprises the follow steps: a low nickel solution I is continuously added into a high nickel solution so that the nickel content in the high nickel solution is continuously reduced, and then the low nickel solution I is continuously pumped into an ammonia aqueous solution to form a continuous reaction system with reduced nickel content, and further hydroxide and carbonate are successively used as precipitants and ammonia water is used as a complexing agent to successively coprecipitate to generate a precursor with a core-shell structure; and then the precursor is sintered with lithium so as to prepare the core-shell structure high nickel gradient nickel cobalt manganese aluminum quaternary positive electrode material. The battery assembled by the positive electrode prepared by the core-shell structure high nickel gradient nickel cobalt manganese aluminum quaternary positive electrode material has high capacity, excellent cycle and rate performance and highly reversible charge-discharge reaction.

The invention relates to a magnesium ion doped gradient nickel cobalt lithium manganate anode material and a preparation method thereof. The chemical formula of the anode material is LiNixCoyMnzMg (1-x-y-z) O2, wherein x is more than 0.5 and less than 0.9, y is more than 0.05 and less than 0.20, z is more than 0.05 and less than 0.30, and 1-x-y-z is more than 0; the nickel content is gradually reduced from the center to the surface of the anode material particles, the manganese content is gradually increased from the center to the surface of the anode material particles, and the contents of cobalt and magnesium are uniformly distributed in the anode material. The invention also discloses a preparation method of the anode material. The anode material has the advantages that the structure and the cycle performance are stable in the charging and discharging process, the capacity is higher, and the charging and discharging reaction is highly reversible. The method has the advantages of simple process, low reaction temperature and low raw material cost, and is suitable for industrial production.

The invention discloses an organic liquid flow battery system for an aqueous system based on a salt cavern. The organic liquid flow battery system comprises two electrolyte reservoirs and liquid flowbattery stacks, wherein the electrolyte reservoirs are salt caverns with physical cavities formed after the salt mine is mined, electrolytes are stored in the cavities and comprise a positive active material, a negative active material and a support electrolyte, the positive active material is a 2,2,6,6-tetramethylpiperidine oxynitride compound, the negative active material is anthraquinones, thepositive active material and the negative active material are directly dissolved or dispersed in a system in which water is used as a solvent in ontological form, the support electrolyte is dissolvedin the system; and the liquid flow battery stacks are respectively connected to the two electrolyte reservoirs. The organic liquid flow battery system for an aqueous system based on a salt cavern notonly has the advantages such as low cost, high safety performance, stable charge and discharge performance and high solubility of active materials, but also can solve large-scale electrochemical energy storage and make full use of some abandoned salt cavern resources.

The invention provides a redox flow battery (RFB) system based on an amino-anthraquinone derivative. The RFB system comprises two electrolyte reservoirs spaced apart from each other, wherein an electrolyte is stored in a tank or a solution chamber and includes a positive electrode active material, a negative electrode active material and a supporting electrolyte, the positive electrode active material is a 2,2,6,6-tetramethylpiperidine oxynitride (TEMPO) compound, the negative electrode active material is an anthraquinone derivative containing a carboxyl group, the positive electrode active material and the negative electrode active material are directly dissolved or dispersed in a bulk form in a system using water as a solvent and are stored in two salt caverns respectively, and the supporting electrolyte is dissolved in the system; and a RFB stack communicating with the two electrolyte reservoirs. The RFB system based on the amino-anthraquinone derivative according to the embodimentof the present invention has the advantages of low cost, high safety performance, stable charge-discharge performance, and high active material solubility.

The invention belongs to the field of intelligent energy storage devices, and particularly relates to a flexible stretchable zinc-air battery based on a foam metal electrode and preparation. The method comprises the steps: preparing a zinc anode and an air cathode with three-dimensional structures by respectively electroplating zinc and nickel on a metal foam or polymer foam substrate, performingcross-linking of a polymer electrolyte membrane on the electrodes and separating the cathode from the anode, and then performing edge sealing to obtain the flexible zinc-air battery with the sandwichstructure; and cutting the flexible zinc-air battery into a specific stretchable shape to obtain the flexible stretchable zinc-air battery. The flexible stretchable zinc-air battery not only can be charged and discharged, but also has good bendable, curly, distorted and stretchable characteristics, maintains stable charging and discharging performance after deformation, and has a good applicationprospect in the field of wearable devices.

The invention discloses a preparation method of an inorganic solid electrolyte membrane, which is used for preparing an inorganic solid electrolyte matrix in an electrode of a lithium battery. A material formulation of the matrix is as follows: a mass ratio of organopolysiloxane resin to lithium phosphate to kieselguhr is (25-30):(3-5):(72-65); the organic solid electrolyte membrane is prepared by inorganic electrolyte slice-slice superposing and polyphenylene sulfide membrane packaging. An inorganic lithium compound obtained by the method disclosed by the invention is uniform in distribution in a matrix membrane, so that charging and discharging performances of a full-solid lithium battery prepared by using the electrolyte are stable, and therefore, the charging and discharging times and the service life as well as the electric capacity are respectively improved by 80%-90% in comparison with the existing lithium battery, and the content of inorganic lithium in the solid electrolyte membrane is 18%-32%. A solid lithium battery prepared by using the electrolyte membrane has the characteristics of long service life, a plurality of charging and discharging times, and large battery capacity.

The invention discloses negative electrode lead paste of a lead-acid storage battery. The negative electrode lead paste is prepared from the raw materials based on mass percentages: 81-85% of lead powder, 0.1-0.5% of humic acid, 0.06-0.1% of short fibers, 0.1-0.5% of acetylene black, 6.7-8.6% of sulfuric acid and 7.9-10.6% of water. A preparation method of the lead paste of the lead-acid storage battery comprises the steps of adding the lead powder, humic acid, short fibers and acetylene black into a paste mixer to be stirred for 8-12min, and then adding water to the paste mixture to be subjected to wet stirring for 10-14min; and adding sulfuric acid to the paste mixture while stirring, wherein the sulfuric acid adding time is 13-16min, and performing continuous stirring for 10-15min aftersulfuric acid is added completely to obtain the lead paste. The lead-acid storage battery prepared from the lead paste is stable in charging-discharging performance, relatively high in low-temperature charging-discharging performance, long in cycle life and relatively high in negative electrode hydrogen evolution suppression effect.

The invention belongs to the technical field of electrochemical power source materials and discloses a method of adopting phosphorus fertilizer product for ultrasonic spraying to prepare multi-position collaborative doped LiFePO4/C. Raw materials of the multibit collaborative doped LiFePO4/C are from the phosphorus fertilizer product and byproducts and include Li, P, Fe, doped element cations K, Na, Ca and Mg and anions S and F. The multibit collaborative doped lithium iron phosphate material is marked as Li1-alpha X alpha Fe1-beta Y beta PO4-gamma Z gamma/C, X refers to lithium position doping, Y refers to iron position doping, Z refers to oxygen position doping, 0</=alpha</=0.05, 0</=beta</=0.05, and 0</=gamma</=2. Collaborative doping of lithium position, iron position and oxygen position is realized, and doping amount is adjustable; compared with single doping, doping materials are extensive in source, and the material is better in performance. The multi-position collaborative doped LiFePO4/C material is uniform in grain diameter and excellent in electrochemical performance.

The invention discloses a potassium ion battery sulfur-doped MXene negative electrode material and a preparation method thereof. The method comprises the following steps that (1) adding MXene and a sulfur source according to the mass ratio of 1:1-20 into deionized water, and stirring to prepare a mixed solution with the concentration of 1-100 mg/ml; (2) transferring the mixed solution into a reaction kettle, heating to 120-200 DEG C, reacting for 12-18 h, and then cooling to room temperature; (3) washing the product obtained in the step (2) by using a detergent, centrifuging, and then performing vacuum drying; (4) and placing the dried product in the step (3) in a tubular furnace, introducing protective gas, carrying out heat treatment reaction, and cooling to room temperature to obtain the potassium ion battery sulfur-doped MXene negative electrode material. The potassium ion battery negative electrode material prepared by the method has good conductivity, higher specific capacity andstable charge and discharge performance.

The invention discloses an organic polymer flow battery system. The system comprises two electrolyte reservoirs distributed separately and a flow battery stack; an electrolyte is stored in a dissolving cavity of each electrolyte storage tank; the electrolyte in one electrolyte storage tank includes a positive electrode active substance; the positive electrode active substance is a TEMPO functionalized organic polymer; the electrolyte in the other electrolyte storage tank has a negative active substance, the negative active substance is a viologen functionalized organic polymer, and the positive active substance and the negative active substance are directly dissolved or dispersed in a system taking water as a solvent in a body form and are respectively stored in the corresponding electrolyte storage tanks; and the flow battery stack is communicated with the electrolyte storage tanks, and the electrolyte is input into or output from the electrolyte storage tank for oxidation-reduction reaction. The organic polymer flow battery system is suitable for a battery environment utilizing in-situ generated electrolyte, and has the advantages of low cost, stable charging and discharging performance, high active material solubility and the like.

The invention discloses a method for producing lithium iron phosphate without inert gas protection, aiming at providing a technique for preparing the lithium iron phosphate without needing the inert gas protection in the calcination process, so as to realize the aim of reducing the manufacturing cost of positive material of a lithium iron phosphate battery. The method comprises the steps: the prepared precursor material is put into a semi-enclosed box body and pressed to be compact to exhaust the air in the precursor material; a high temperature resistant plate provided with holes is pressed on the precursor material or a gap is left between the high temperature resistant plate and the box body, and then a carbon dust layer is filled into the high temperature resistant plate; finally, the high temperature resistant plate provided with the slim holes is laid on carbon dust or the gap is left between the high temperature resistant plate and the box body; the box body is placed into a calcination device and heated from the room temperature to be 600-800 DEG C at the speed of 5-20 DEG C/min; after that, the temperature is maintained for 6-24h for calcination, and then the product is cooled to be the room temperature along with a furnace.

The invention discloses a stored energy power generation device based on a salt hole, a control method and an application thereof. An organic flow cell comprises two electrolyte storage warehouses, aflow cell pile, an electrolytic tank body, a cell diagram, a circular pipeline and a circulating pump, wherein the electrolyte storage warehouses are formed as salt holes with soluble cavities. An electrolyte is stored in each soluble cavity. The electrolyte comprises an anode active substance, a cathode active substance and a supporting electrolyte. The supporting electrolyte is saturated electrolyte formed in the soluble cavity of the salt hole when the salt hole is formed by a water soluble method. The anode active substance and the cathode active substance are water soluble organic activemolecules. A flow cell pile comprises two pole plates. The electrolyte is supplied circularly in a flowing manner through the circulating pump. The stored energy power generation device based on saltholes not only has the advantages of being low in cost, high in safety performance, stable in charge and discharge performance, high in solubility of active materials, but also can solve the problem of electrochemical energy storage on a large scale, and some waste salt hole resources are fully utilized.

The invention discloses a preparation method of nanometer SiC capable of being used as a negative electrode material of a lithium ion battery, belonging to the technical field of lithium ion batteries. The preparation method of the nanometer SiC comprises the following steps: mixing SiO2, graphite, isopropanol, polyvinyl alcohol and polyethylene glycol, carrying out drying and sintering successively to obtain a SiO2/graphite mixture, and carrying out electrodeoxygenation by using molten CaCl2 to synthesize the nanometer SiC material. The nanometer SiC material has a unique nanowire form and uniform element distribution, shows stable charge-discharge properties, has specific capacity and volume capacity higher than the specific capacity and volume capacity of a graphite material and can become the negative electrode material with potential competitiveness for the lithium ion battery; the effects of simple preparation process flow, relatively low cost and relatively low energy consumption can be realized; high-selectivity large-scale production can be realized by controlling process conditions; and the problems of high production temperature, high impurity content of a product, difficulty in batch production and the like when SiC is prepared by a conventional carbothermic reduction method are solved.

The invention discloses a vanadium pentoxide and rGO co-coated gradient ternary positive electrode material and a preparation method thereof. The positive electrode material is spherical core-shell structure particles formed by coating lithium nickel cobalt manganate on the inner and outer layers of vanadium pentoxide and rGO. The mass ratio of the lithium nickel cobalt manganate to the vanadium pentoxide to the rGO is 1: (0.01-0.05): (0.01-0.05). The chemical formula of the lithium nickel cobalt manganate is LiNixCoyMn(1-x-y)O2, x is greater than or equal to 0.70 and less than or equal to 0.90, y is greater than or equal to 0.05 and less than or equal to 0.2, and 1-x-y is greater than 0. The invention also discloses a preparation method of the vanadium pentoxide and rGO co-coated gradientternary positive electrode material. The positive electrode material is high in lithium ion and electron conductivity and good in electrochemical performance. The method is simple, controllable, short in process, low in cost and suitable for industrial production.

The invention discloses a preparation method of lithium iron phosphate as a cathode material of a lithium ion battery, which comprises the following steps: uniformly mixing reaction liquid and pressurizing the reaction liquid; then enabling reaction raw materials to mix, carry out crystal nucleation and grow in a flowing process through an external heating heat pipe by utilizing the continuous flow of liquid in the heating pipe and the heating outside the heat pipe so as to continuously synthesize a lithium iron phosphate material; at the tail end of the reaction, cooling, filtering, washing and drying the liquid to obtain a finished lithium iron phosphate product. The invention can avoid large energy waste caused by repeated heating when a reaction kettle is utilized and is beneficial toenergy saving and environment protection. When the liquid flows in the heating pipe, the materials are uniformly mixed and have smaller grain size, narrow grain size distribution and high purity; andbecause of continuous production, the performance of the materials is extremely stable, thus the invention is suitable for industrial mass production.

The invention relates to the technical field of solid lithium batteries, and discloses a negative plate capable of being quickly charged at low temperature and a preparation method thereof. The invention relates to a negative plate capable of being rapidly charged at a low temperature, which is characterized in that two sides of a negative current collector are coated with negative slurry formed by mixing high lithium intercalation potential particles, negative active particles, a conductive agent, a binder and a binder solvent, the negative plate is obtained by pressing, and the initial lithium intercalation potential of the high lithium intercalation particles is 1.0-1.6 V. The high-lithium-intercalation-potential particles are added to wrap the outer surfaces of the negative active particles, the low-temperature lithium intercalation speed is high, the conductivity of the negative plate can be effectively enhanced, excessive lithium precipitation in the charging and discharging process of the solid lithium battery at the low temperature is prevented, and the long cycle life is kept. When being used for a solid lithium battery, the negative plate capable of being rapidly charged at low temperature has the advantages of less lithium precipitation at low temperature, no electrolyte solidification, good stability at high temperature, stable and rapid charging speed and long cycle life.