109results about How to "High voltage platform" patented technology

The invention relates to an application of a porous carbon material with a grading pore structure in a lithium-air cell anode, and is characterized in that the carbon material has mutually communicated grading pore structure distribution which has a mesoporous structure for depositing the discharge products and a macroporous structure suitable for transmission of oxygen and an electrolyte. When the carbon material is taken as a material of the lithium-air cell anode, the space utilization rate of carbon material can be increased at maximum limitation during a charge and discharge process, specific discharge capacity, voltage platform and multiplying power discharge capability of the cell can be effectively increased, so that the energy density and power density of the lithium-air cell can be increased. The porous carbon material has the advantages that the preparation technology is simple, the material source is wide, the grading pore carbon material pore structure enables regulation and control, the regulation and control modes are various, and the doping of metal/metal oxide can be easily and simultaneously realized.

The invention provides an off-grid and grid-connected operation light and storage joint power supply system which comprises a DC/AC converter for connecting a direct current bus and an alternating current bus. The alternating current bus is connected with a power grid. The alternating current bus and the direct current bus are connected with an alternating current load and a direct current load respectively. The direct current bus is connected with a photovoltaic array and a battery system through a photovoltaic DC/DC converter and an energy storage DC/DC converter respectively. According to the off-grid and grid-connected operation light and storage joint power supply system, control strategies of the off-grid and grid-connected operation light and storage joint power supply system are provided and include the off-grid state operation control strategy and the grid-connected state operation control strategy. By means of the system and a method, the defects that an existing photovoltaic power supply system is instable in power supply quality, poor in schedulability, single in operation mode, low in energy conversion efficiency and the like are overcome.

The invention discloses a ferrous lithium salt composite anode material and thepreparation method thereof. The technical problems which are needed to be solved are to enhance the high-rate electricity discharging of the anode material, and the manufacturing and the processing performances of battery electrodes are improved. The ferrous lithium salt composite anode material has lithium iron phosphate, and forms the composite material by adulterated with or covered by nickel-cobalt-manganese-lithium or nickel-cobalt-aluminum-lithium material. The weight ratio of the lithium iron phosphate and the nickel-cobalt-manganese-lithium or the nickel-cobalt-aluminum-lithium material is 9 to 7 : 1 to 3, and the micro-morphology is in a sphericity , or is like a sphericity, with a ration between a horizontal length and a vertical length of 1.2 to 2.5. The crystal is in the structure of an olivine type, a space group is Pbnm, and a particle diameter is 1 to 20microns. The preparation method comprises mixture, fusion processing and screen separation. Compared with the prior art, the ferrous lithium salt composite anode material has the advantages of capable of lowering specific surface area, capable of enhancing the voltage platform of the anode material, favorable processing performance, high tap density, favorable conductivity, favorable rate discharge performance and safe performance, capable of improving high and low temperature cycling performance, and favorable compatibility with various cathodes and electrolytes.

The invention provides positive electrode material Fe<x>Co<1-x>S<2> powder of a thermal battery and preparation method for the powder. In the Fe<x>Co<1-x>S<2> powder, x is greater than 0 and less than 1. The positive electrode material Fe<x>Co<1-x>S<2> powder of the thermal battery is prepared by combination of advantages of two kinds of positive electrode materials of CoS<2> and FeS<2> by a method in combination of chemical deposition and high-temperature solid-phase reaction. The positive electrode material Fe<x>Co<1-x>S<2> powder of the thermal battery has the advantages of high capacity and high voltage platform of the FeS<2>, as well as the advantages of low electrical resistivity and thermal stability of CoS<2>, and is a novel positive electrode material of the thermal battery.

The invention specifically discloses a phosphate-pyrophosphate composite polyanionic iron-based positive electrode material with a chemical formula of Na4Fe2M(PO4)2(P2O7), belonging to the field of positive electrode materials for sodium-ion batteries. In the chemical formula, M is at least one selected from a group consisting of Mn, Co and Ni. In addition, the invention also discloses a preparation method and application of the positive electrode material. The positive electrode material provided by the invention has good electrical properties. Study results show that the positive electrode material has a high voltage platform of 3.5 v or more and excellent thermal stability, rate performance and cycle performance. The preparation method of the invention is simple in process, high in repeatability and low in cost and has great commercial application prospects.

The invention discloses a preparing technology of high-energy Li-marcasite battery material, which comprises the following steps: covering conductivity and stable metal oxide on the surface of marcasite with composite conductive; setting the percentage of marcasite at 82-94 percent, conductive percentage at 4-10 percent and metal oxide percentage at 2-8 percent. The method reduces grain size of natural marcasite material through wetting ball grinding technology, which prepares the needed anode material.

The invention is applicable to the technical field of lithium batteries, and provides a high-energy density type lithium cobaltate cathode material and a preparation method thereof. According to the high-energy density type lithium cobaltate cathode material and the preparation method thereof, doped type primary lithium cobaltate particles are generated by performing solid phase reaction on a cobalt source which is pre-doped with Ni element, an additive and a lithium source, and then the surfaces of the doped type primary lithium cobaltate particles are coated with a doped N element-containingLiVPO4F material which is stable under high voltage, wherein the cobalt source is pre-doped with Ni, so that the Ni element can be distributed more uniformly in a substrate, and a material structureis more stable in a charging-discharging cyclic process; meanwhile, the substrate is added with an M element, so that the effect of stabilizing the material structure is further achieved. The LiVPO4Fmaterial has the advantages of stable structure, high voltage platform and the like; the lithium ion conductivity of the LiVPO4F material can be further improved through doping. The lithium cobaltatecathode material provided by the invention can be normally used under the max charge voltage of 4.50 V, and has excellent cycle performance and safety performance.

A method for preparing positive electrode multielement active material containing lithium / manganese composite oxide includes directly using lithium hydroxide coprecipitation to prepare M ( OH )2 , mixing it with lithium salt in grinding , forming plate by pressing , prebaking , cooled ball grinding , forming plate by pressing and backing . In the method , applied nickel salt is nickel acetate or nickel nitrate , applied cobalt salt is cobalt acetate or cobalt nitrate, applied manganese salt is manganese nitrate or manganese acetate and applied lithium salt is lithium carbonate or lithium acetate .

The invention relates to a nitrogen-doped porous carbon material used for anode of a lithium-air cell, which has a mutually communicated graded pore structure, N is uniformly doped in a C frame, wherein N accounts for 0.2-15% of carbon material, the graded pore comprises a mass transfer pore and a deposition pore, the pore volume of the deposition pore accounts for 40-95% of total pore volume, and the pore volume of the mass transfer pore accounts for 4-55% of total pore volume. The carbon material as the lithium-air cell material can greatly increase the space utilization rate of the carbon material during a charge and discharge process at maximum limit, so that lithium-air cell energy density and power density can be effectively increased. The nitrogen-doped porous carbon material used for anode of lithium-air cell has the advantages that the preparation technology is simple, the material source is wide, the pore structure of the graded aperture carbon material enables regulation and control, and the regulation and control modes are various, and the nitrogen doping mode is easy to realize.

The present invention relates to a nitrogen-doped porous carbon material for a lithium-air battery positive electrode. The nitrogen-doped porous carbon material is characterized in that the nitrogen-doped porous carbon material has an interconnected graded pore structure, N is uniformly doped in the C skeleton, N accounts for 0.2-15% of the carbon material atomic ratio, the graded pores comprise mass transfer pores and deposition holes, the deposition holes account for 40-95% of the total pore volume, and the mass transfer pores account for 4-55% of the total pore volume. According to the present invention, with application of the carbon material as the lithium-air battery electrode material, the space utilization rate of the carbon material during the charge-discharge process can be increased at a maximum, and the energy density and the power density of the lithium-air battery can be effectively increased; and the preparation process is simple, the material source is wide, the pore structure of the graded pore carbon material can be regulated, the regulation manner is diverse, and the nitrogen doping manner is easily achieved.

The invention discloses a lithium-rich vanadium lithium iron phosphate anode material, aiming to overcome the respective defects of lithium iron phosphate and lithium vanadium phosphate. The material comprises LixFe1-3yV2yPO4/C, wherein the x is great than or equal to 1.0 and less than or equal to 1.15 and the y is equal to 0.01-0.2. The material simultaneously has the composite crystal structures of olivine lithium iron phosphate and monoclinic lithium vanadium phosphate. The preparation method comprises the following steps of: weighing the initial raw materials, namely a lithium source, an iron source, a vanadium source and a phosphorus source in the molar ratio of x:(1-3y):2y:1, adding a carbon source and a dispersing agent, ball-milling and mixing in a liquid medium, subjecting to low-temperature pre-sintering and high-temperature sintering under the protection of an inert gas or a reducing gas, and cooling to the room temperature, thereby obtaining the vanadium lithium iron phosphate anode material.

The invention discloses the application of organic sulfur in second magnesium battery anode material, employing organic sulfur as anode, magnesium as cathode, and Mg[AlCl2(C4H9)(C2H5)]2/ tetrahydrofuran as electrolytic solution to form second magnesium battery. The application of organic sulfur as anode material for second magnesium battery, is characterized by large capacity, high voltage plat, and first discharge capacity reaching 110 mAh/g, stable discharge voltage plat reaching about 1.6 V; and by simple process, low cost, and designable structure compared with Mo3S4 for current second magnesium battery.

The invention discloses a preparation method of an all-solid-state battery employing a lithium metal as a negative electrode. The method is characterized by comprising the following steps: (101) pressing the lithium metal on a current collector in the preparation process of an all-solid-state battery core; (102) coating the surface of the lithium metal with a negative material thin layer; and (103) finishing pressing and molding of a solid electrolyte and a composite positive material and preparation of the all-solid-state battery core. Negative material thin layer coating is carried out on the surface of the negative electrode of the lithium metal; and the lithium metal and the solid electrolyte material are physically isolated, so that the solid electrolyte material is prevented from directly contacting the lithium metal for reaction. With the painted negative material thin layer as a transitional material, the all-solid-state battery has electronic conductivity, and meanwhile, shuttling of lithium ions in the charge-discharge cycle process of the all-solid-state battery is not hindered.

The invention provides a method for preparing lithium iron manganese phosphate from waste lithium iron phosphate and a lithium manganate material. The method comprises the following steps: (1) recycling waste lithium manganate to obtain a filtrate A; (2) recycling the waste lithium iron phosphate to obtain filtrate B; (3) carrying out ICP (Inductively Coupled Plasma) test on the filtrate A and thefiltrate B to obtain the content of each main element in the two groups of filtrate; (4) the ratio of the filtrate A to the filtrate B is determined according to the mole number x + y = 1 of Fe and Mn elements in the two groups of filtrate, x is equal to (0.9-0.1), and y is equal to (0.1-0.9); supplementing a phosphorus source and a lithium source according to the required molar ratio of P, Li, Mn and Fe, and reacting to obtain a lithium ferric manganese phosphate precursor; and then carrying out high-temperature roasting thermal reaction to obtain the lithium iron manganese phosphate positive electrode material. The method provided by the invention is relatively simple in process and convenient to operate, the two waste raw materials are wide in source and low in price, the loss of resources and the addition of auxiliary materials can be reduced, the material recovery rate can be increased, and the cost of equipment, production, raw materials and the like can be reduced.

The invention provides a lithium nickel manganese oxide positive electrode material, a preparation method thereof and a lithium ion battery. The preparation method of the lithium nickel manganese oxide positive electrode material comprises the steps that a lithium source, a nickel source, a manganese source, water, beta-cyclodextrin, a complexing agent and an alkaline regulator are subjected to a gel reaction, a precursor gel is obtained, wherein the molar ratio of lithium elements in the lithium source to nickel elements in the nickel source to manganese elements in the manganese source is (1.00-1.06): (0.45-0.55): (1.45-1.85); and dehydrating and calcining of the precursor gel are carried out to obtain the lithium nickel manganese oxide positive electrode material. According to the preparation method, anchoring of nickel and manganese can be realized, so that the probability of mixed arrangement of lithium ions and nickel ions in the lithium nickel manganese oxide positive electrode material is reduced, the structural stability of the lithium nickel manganese oxide positive electrode material is improved, a spinel type structure is formed, and the prepared lithium nickel manganese oxide positive electrode material has good first discharge efficiency, rate capability, capacity recovery and cycling stability.

The invention relates to an ultrahigh voltage lithium cobaltate material and a preparation method thereof. The material is mainly used on a lithium ion secondary battery, so that the charging cut-off voltage of the battery can be up to 4.50V, and material has excellent cycle performance and safety performance. The general formula of the structure of the material is LiNixCo1-x-y-MyO2, wherein x is not smaller than 0.01 and is not greater than 0.08, and y is not smaller than 0.005 and is not greater than 0.1.The preparation method of the material comprises the following steps: separately mixing, ball milling and sintering a cobalt resource and a lithium source containing a doped element Ni with a compound containing an element M to obtain primary lithium cobaltate granules B and B1; mixing the primary lithium cobaltate granules B and B1 to obtain an intermediate product C; and mixing, ball milling and sintering the mixed intermediate product C with the compound containing the element M and the element Co to obtain the ultrahigh voltage lithium cobaltate material.

Provided are a positive electrode active material and an electrochemical device. The positive electrode active material is of a P63mc crystal structure and is a lithium transition metal composite oxide containing Co and an R element, wherein the M element includes at least one of Al, Mg, Ti, Mn, Fe, Ni, Zn, Cu, Nb, Cr, Y, or Zr, the R element includes at least one of F, Cl, and the R element is amolar content of nR; wherein the sum of the molar content of Co and the molar content of M is nCo+M, and the ratio delta of nR to nCo+M is larger than 0 and smaller than or equal to 0.01. The positiveelectrode active material disclosed by the invention is high in crystal structure stability, so that the cycle performance and the thermal stability of an electrochemical device are improved.