121results about How to "High discharge platform" patented technology

The invention discloses a high-voltage high-energy-density lithium ion battery which comprises a positive pole piece, a negative pole piece, a diaphragm, electrolyte and a shell, wherein the positive pole piece comprises a positive active material, a conducting agent, an adhesive and a current collector, and the weight percents of the positive active material, the conducting agent and the adhesion are 92 to 97%: 2 to 3.5%: 1 to 6%; the negative pole piece comprises a negative material, a conducting agent, an adhesive and a current collector, and the weight percents of the negative material, the conducting agent and the adhesive are respectively 90 to 96%, 1 to 5% and 4 to 10%; the lithium ion battery is prepared by adopting modified lithium cobalt oxides (LiCoO2) as the positive active material and the artificial graphite or natural graphite as the negative material and matching the corresponding ceramic diaphragm, high-voltage electrolyte, adhesive and conducting agent. The lithium ion battery not only has high energy density and high discharging platform, but also is good in chemical performance and safety performance and is applicable to the commercialized mass production.

The invention relates to a carbon-sulphur composite used for a cathode material of a lithium sulphur battery as well as a preparation method and application thereof. The carbon-sulphur composite comprises a carbon material and elemental sulphur, wherein the carbon material is formed by doping mesoporous carbon with the aperture of 2-5nm and electroconductive carbon with the aperture of 30-70nm, and the electroconductive carbon with the aperture of 30-70nm contains micropores with the aperture of 0.5-1.7nm; and the elemental sulphur accounts for 10-90wt% of the total quantity of the composite. Abundant micropores guarantee that the carbon material has larger specific surface, adsorption capacity to polysulphide is stronger, and dissolution of the polysulphide can be effectively limited, so that stability of a sulphur electrode is improved. Meso pores in porous distribution can load more sulphur active substances, electrochemical capacity of a composite material is improved, and diffusion and transmission of lithium ions and electrolyte solution can be facilitated, so that reduction polarization of the elemental sulphur is reduced and discharge plateau of the elemental sulphur is improved.

A method for preparing a ternary anode material of a long-service-life and high-capacity lithium ion battery and belongs to the technical field of material synthesis. The method comprises the following steps: weighing a lithium source and NixCoyMnz(OH)2, uniformly mixing, pre-burning at a temperature of 400-600 DEG C for 2-6 h, and forging at a temperature of 700-1000 DEG C for 6-16 h; uniformly mixing the ternary anode material, the lithium source and nanometer TiO2; forging at a temperature of 700-950 DEG C for 3-8 h to obtain the ternary anode material which is prepared by twice lithium adding and twice forging. The ternary anode material is prepared through twice lithium adding and twice forging, and the extra lithium source which is introduced through twice lithium adding and twice forging is electrochemically pre-embedded in an anode. Meanwhile, the Li+ diffusion rate can be effectively increased through the doping of Ti4+, and the irreversible capacity loss is reduced. In an interval of 2.3-4.6 V, a discharging platform is prolonged, and the first discharging capacity, the cyclic performance and the rate performance of the material are obviously improved. The method is simple, effective, economical and practical and has a remarkable industrial application effect.

The invention relates to a nickel-zinc secondary battery and a preparation method thereof. The technical scheme is that: the preparation method comprises the following steps of: mixing 85 to 99 weight percent of anode active substance, 0.5 to 10 weight percent of anode additive and 0.5 to 5 weight percent of anode bonding agent uniformly; adding water into the mixture to prepare paste; coating the paste on an anode conductive matrix; drying, performing roll forming and slicing to obtain an anode plate; mixing 75 to 99 weight percent of cathode active substance, 0.5 to 20 weight percent of cathode additive and 0.5 to 5 weight percent of cathode bonding agent uniformly; adding water into the mixture to prepare paste; coating the paste on a cathode conductive matrix; drying, performing roll forming and slicing to obtain a cathode plate; separating the anode plate from the cathode plate by using diaphragm paper; winding the separated anode plate and cathode plate to be a cylindrical shape; sleeving the cylindrical object into a battery case; injecting electrolyte, wherein the anode plate is connected with an anode cap by a lug and the cathode plate contacts with the battery case; and sealing the battery to form the nickel-zinc secondary battery. The nickel-zinc secondary battery prepared by the method has a long cycle life, a high discharging platform and high specific energy.

The invention relates to a positive electrode material of a lithium ion battery, especially to a high-capacity nickel-cobalt-lithium manganate precursor and a preparation method thereof. The high-capacity nickel-cobalt-lithium manganate precursor is characterized by having a chemical formula of NixCoyMnz(OH)2, wherein x is no less than 0.5 and no more than 0.9, y is no less than 0.05 and no more than 0.2, z is no less than 0.05 and no more than 0.3, and x+y+z is equal to 1. The invention provides the high-capacity nickel-cobalt-lithium manganate precursor prepared through coprecipitation and the preparation method thereof; and the prepared precursor has concentratedly distributed particle size, high tap density, good sphericility, high specific capacity, low cost, long service life, higher discharge plateau and energy density, primary 1C charge-discharge specific capacity of 195 mA.h/g and 186.5 mA.h/g, and capacity retention ratio of 95.6% after 50 cycles.

The invention discloses a lithium/air battery which belongs to the chemical power source field and is designed for solving the technical problem anode metallic lithium corrosion, high possibility of power failure and bad cycle performance of the existing lithium air battery. A shell is divided into an anode room, a buffer room and a cathode room by a solid inorganic electrolyte membrane and a diaphragm. The lithium/air battery uses a hydrophobic ionic liquid as an anode electrolyte, which has the advantages of non-volatile, high conductivity, wide electrochemical window, low melting point and moderate viscosity, and can prevent the metallic lithium from being corroded by water and oxygen. The cathode uses a water base-weak acid-buffer solution with the Ph of not less than 4 and not more than 5 as the electrolyte; compared with a neutral or alkaline electrolyte, the water base-weak acid-buffer solution ensures that the average discharge voltage (0.1-0.2V) can be improved, a discharge plateau can be prolonged, and the corrosion of the strongly alkaline electrolyte to the solid inorganic electrolyte membrane is reduced; and a cathode discharge product is a water-soluble LiOH which cannot deposit on the surface or in the duct of the cathode to cause power failure, and is good in cycle performance.

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery cell which comprises at least two positive electrode plates, at least two negative electrode plates, a first wound membrane and a second wound membrane, wherein the positive electrode plates and the negative electrode plates are mutually overlapped, and the difference of the number of the positive electrode plates and the number of the negative electrode plates is one; the positive electrode plates are arranged at the same side of the first membrane; the negative electrode plates are arranged at the same side of the second membrane; and at the direction from the innermost circle to the outermost circle of the battery cell, the first membrane and the second membrane are alternatively arranged between the adjacent positive electrode plates and the negative electrode plates at intervals. Compared with the prior art, the lithium ion battery cell has the advantages that the parallel connection multiple layers of electrode plates provided by the invention can be used for reducing the internal resistance of the battery cell, thus the polarization is reduced, and the discharging platform is improved; the parallel connection of the electrode plates can be used for improving the high-multiplying-power charging and discharging capability of the battery cell; and because the electrode plates of the battery cell provided by the invention are stacked together, the internal structure is unified, the stress is distributed uniformly, the possibility of deformation is small. In addition, the invention also discloses a preparation method of the battery cell.

The invention relates to an anode material of a Li-ferrous disulfide battery and the Li-ferrous disulfide battery, belonging to the battery field. The anode material of the Li-ferrous disulfide battery comprises the following ingredients by weight percentage: 50-99.5 percent of ferrous disulfide powder, 0.25-25 percent of bonder, 0.25-25 percent of conductive agent and the balance first main group element compounds accounting for 0.4-10 percent of the quality of the ferrous disulfide powder; the first main group element compounds comprise one ore more o carbonate, bicarbonate, silicate, germanate, acetate, phosphate, aluminate, titanate and amino salts. In the invention, the added first main group element compounds greatly improve the discharging platform and discharging performance of the battery, the discharging platform of the battery is high, the discharging time is long, the discharge capacity is large, the heavy-current discharging property is good and the storage life is long.

The invention discloses a lithium air or oxygen battery, comprising an air or oxygen electrode, a cathode, a diaphragm and electrolyte, wherein materials of the air or oxygen electrode comprise a nitrogen-doped carbon material and further comprise one or more than two of a transition metal oxide, a transition metal nitride, a transition metal carbonitride, a transition metal carbide and other catalysts. According to the invention, the nitrogen-doped carbon material is used to a traditional carbon material, meanwhile, the cheap catalyst which constitutes an active substance of the air or oxygen electrode can be used in an auxiliary way or is not used, and compared with the traditional lithium air or oxygen battery, the lithium air or oxygen battery which is finally obtained according to the invention has higher specific capacity, higher discharge plateau, favorable integral electrochemical performance and better industrial practical values. In addition, the lithium air or oxygen battery disclosed by the invention is extremely suitable for being used as a backup battery for substituting a lithium ion battery.

The invention discloses a preparation method of a ferrous silicate lithium doped anode material. The preparation method comprises the following steps of: weighing lithium salt, ferrous silicate salt, a silicon compound and phosphate according to the mole ratio being (0.95-1.10):(0.95-1.10):(0.80-0.999):(0.001-0.286) of lithium ions to ferrous silicate ions to silicon atoms to phosphorous acid radical ions in an initial reactant and mixing the compounds to obtain an initial reaction mixture; adding a carbon-containing compound which is 1-30 percent of the weight of an anhydrous state compound of the initial reaction mixture and a wet milling medium which is 0.10-10 times of the volume of the anhydrous state compound; ball milling and mixing and heating in a water bath; ball mixing and mixing gain; finally drying; placing the dried powder in an inert atmosphere or a weakly reducing atmosphere; and preparing doped ferrous silicate lithium by adopting a two-stage sintering method or a two stage program temperature-rising sintering method. The electrode material has better discharge performance; the discharge capacity of the prepared sample in a 3.0V zone is remarkably increased; and the prepared sample has excellent circulating performance under the current of 0.3C multiplying power, which lays a sound foundation for the industry.

The invention relates to a method for manufacturing a novel lithium iron battery. The novel lithium iron lithium ion battery is manufactured by combining an anode active substance made of a FeF3/V2O5 composite material and LiMn2O4 with a carbon cathode, wherein the anode active substance is prepared by ballmilling 5 to 85 mass percent of LiMn2O4 and 95 to 15 mass percent of FeF3/V2O5 composite material for 1 and 8 hours; before the anode active substance is prepared, the FeF3/V2O5 composite material is prepared first, namely V2O5 accounting for 1 to 50 percent of the total mass of the composite material and FeF3 accounting for 99 to 50 percent of the total mass of the composite material are subjected to high-energy ball mill for 1 to 8 hours and the ground V2O5 and FeF3 are annealed at the temperature of between 100 and 600 DEG C for 1 to 12 hours to form the FeF3/V2O5 composite material. The method has the advantages of improving the conductivity of the material, prolonging the service life of the battery, improving a discharging platform substantially and enhancing the large-current discharging capacity of the battery, along with high safety performance of the battery.

The invention relates to a cobalt phthalocyanine/copper phthalocyanine/pitch coke activated carbon catalytic material and method for preparing a lithium thionyl chloride battery positive plate by using the catalytic material. The method comprises the following steps of: taking pitch coke activated carbon with a large specific surface area (800m2/g) and high activity as a template, and growing cobalt phthalocyanine and copper phthalocyanine on the surface in situ, wherein a pitch coke activated carbon framework plays a role in structural support, and is linked through hydrogen bonds and covalent bonds, so that agglomeration of phthalocyanine complexes is avoided, and the structural stability of the material is improved; in addition, the preparation process is simple and easy to control through a solid-phase in-situ one-step sintering method, the period is short, the energy consumption is low, the repeatability of the product is high, the yield is high, and the large-scale production isfacilitated. The catalytic material prepared by the method is used for the lithium thionyl chloride battery, the initial discharge voltage is increased by 0.18V and the energy density is increased by73% compared with the initial discharge voltage of the anode material without the catalytic material. The application prospect is wide.

The invention discloses a preparation method of a cobalt-based material for the positive poles of lithium batteries, which comprises the following steps of: coating a nickel-cobalt-manganese hydroxide on the outer surface of spherical cobaltosic oxide and sintering to form the cobalt-based material of LiCo0.6Mn0.2Ni0.2O2. The cobalt-based material prepared by using the preparation method only not maintains the characteristics of lithium cobaltate materials of high volumetric specific energy and high discharge platform, but also has higher heat stability compared with lithium cobaltate, also reduces the cost of the lithium cobaltate materials and is the substitute of the next generation lithium cobaltate positive pole materials.

The invention discloses a preparation method of a high-rate capacity lithium iron phosphate material, which comprises the steps of: weighing FePO4.xH2O and a lithium source compound as raw materials according to the mol ratio of Li to Fe of (1-1.05) :1, adding a carbon source compound and a catalyst (nitrate or acetate of Fe, Co, Ni and the like), ball-grinding for 0.5-24h by using deionized water, absolute ethyl alcohol or acetone as a ball grinding medium to obtain slurry, spraying and drying the slurry and then thermally treating under the protection of an inert gas, and in the process, with the thermal cracking of the carbon source compound, promoting the carbon source compound to form a carbon cladding cover with higher graphitization crystallinity under a lower temperature through mutual action of the catalyst and the carbon source compound. The lithium iron phosphate cathode material prepared by adopting the preparation method has higher electronic conductivity and higher specific capacity under the condition of lower carbon content, greatly improved high-rate performance especially, and better application value in the field of power batteries.

The invention provides a method for preparing lithium-silicon alloy cathodes. The method includes mixing analytically pure silicon powder and lithium powder with each other according to a molar ratio of (8-5):(2-5) to obtain mixtures; carrying out ball-milling on the mixtures in inert atmosphere environments for 4 hours to obtain sandy substances; filling foamed nickel with the sandy substances according to certain filling density; compressing tablets; heating the tablets until the temperatures of the tablets reach 160-170 DEG C and keeping the temperatures of the tablets unchanged for 1 hour; cooling the tablets until the temperatures of the tablets reach the room temperature and taking out the tablets to obtain the lithium-silicon alloy cathodes. The method has the advantages that the lithium-silicon alloy cathodes are low in polarization, high in capacity and long in cycle life; processes for manufacturing the lithium-silicon alloy cathodes are simple and are easy to implement and control and low in energy consumption.

The invention relates to a method for preparing a phosphate series lithium ion battery anode material, comprising the following steps: preparing one or more of divalent manganese source compound, ferrum source compound, nickel source compound or cobalt source compound into a mixed solution; adding oxalic acid or oxalate, acid and urea, and slowly hydrolyzing the urea by controlling the reaction temperature and time; causing the pH value of the system to rise to reach the condition of homogeneous precipitation; after the reaction, filtering, washing and drying to obtain a precursor; evenly mixing and carrying out ball milling on the precursor, a lithium source and a phosphorous source; and calcining the mixture under the non-oxidability atmosphere to prepare the unitary or multielement phosphate series lithium ion battery anode material. The precursor prepared with the method has the advantages of stable ingredient proportion, even granularity distribution, good consistency and simple synthetic technology, does not need to consider the influence of flow rate and agitation and is suitable for industrial production. The synthesized battery anode material is the phosphate compound with an olivine structure, the average grain size of the primary particle is 100-500nm, and the battery anode material has good electrochemistry property.

The invention relates to a surface processing method of metal hydride. The surface processing method comprises fluoridation, hydroborate processing and chemical plating. A close coating is formed on the surface of metal hydride powder after being processed by the surface processing method and the close coating has high catalytic activity, good plastic property and strong corrosion resistance so as to improve the charge discharge efficiency of the metal hydride, reduce a charging platform, raise a discharging platform and increase the discharge capacity of the metal hydride. As a result, the high-rate discharge property of the metal hydride is greatly improved and the cycle life of the metal hydride is prolonged.

The invention discloses preparation methods of a spherical lithium manganate for a lithium-ion power battery and a precursor of the spherical lithium manganate. The preparation method for the precursor is carried out as the following steps: (1) preparing a manganese salt water solution; (2) preparing a precipitant water solution; (3) injecting the prepared solutions in the step (1) and the step (2) to a reaction kettle with a stirrer and a constant-temperature water bath; (4) mixing the obtained MnCO3 and a compound containing an element M based on a mol ratio of M to Mn described in the invention, sintering and obtaining the precursor. The preparation method of the spherical lithium manganate is carried out as the following steps: mixing the precursor and Li2CO3, sintering and obtaining an M-doped spherical spinel lithium manganate. Compared with the prior art, the method of the invention has the advantages that: (1) impurity content is low, discharge plateau is high, specific capacity is high, cycle performance is good, high-temperature performance is good and tap density is high; and (2) raw material price and production cost are low, powder particle size can be controlled, microscale additive disperses uniformly, particle size distribution is concentrate, and microscopic morphology is spherical or spheroidic.

The object of the present invention is to provide a novel titanium phosphate electrode material having good lithium ion battery characteristics, and is to solve the problem that the cycle life of a titanium pyrophosphate electrode material is poor in the prior art. The electrode material is intercalation compound carbon-coated C-Fe[x]TiP[2]O[7+x], and is a fast ion conductor electrode material of a three-dimensional structure. A preparation method comprises: (1) mixing and grinding TiO2 and NH4H2PO4, adding distilled water, stirring until the mixture is dried, finally placing the mixture in air for calcination to obtain TiP2O7; and (2) taking TiP2O7 obtained in Step (1) as a raw material, weighing TiP2O7 and an iron source material, mixing evenly, then adding a carbon source aqueous solution, stirring continuously at 40 DEG C until the mixture is dried, and finally calcining the mixture in a nitrogen atmosphere to obtain carbon-coated C-Fe[x]TiP[2]O[7+x].

The invention provides a lead-acid battery grid, comprising a grid main body, bulges which are arranged in arrays are formed on one side of the grid main body, and side-open type through holes are formed between the bulges and the grid main body. The invention also provides a lead-acid battery polar plate which comprises a grid and lead plaster coated on the surface of the grid. The invention also provides a method for preparing the above polar plate grid, comprising the steps of manufacturing a lead belt, rolling belt on the lead belt, punching and deep drawing. The invention can greatly save the use amount of lead, improve the charging receptivity, discharging platform, specific energy and specific power of the polar plate; the method provided in the invention is simple, and the manufactured polar plate grid has high quality, thus being capable of realizing continuous and high-yield production of the polar plate grid, reducing bit material remelting consumption of lead, and loweringproduction energy consumption and material oxidation.

The invention discloses a method for coating the surface of nano-alpha-phase nickel hydroxide with CoOOH. The method is mainly characterized in that a precipitation conversion process is adopted to coat the surface of alpha-phase nickel hydroxide with a layer of CoOOH. The method obviously improves the conductive performance of the alpha-phase nickel hydroxide, and improves the electrode performance of nickel hydroxide, so the cell performances are obviously improved, for example, the specific capacity and the output power are improved, the large-rate discharge capability and the charge and discharge cycle performance are improved, and the oxygen evolution over-potential and the discharge plateau are improved. The discharge capacity of the cobalt coated nickel hydroxide prepared in the invention is high to 386mAh/g.

The invention belongs to the technical field of lithium fluorocarbon batteries, and particularly relates to a preparation method of a high-specific-energy fluorinated graphene lithium battery. The lithium fluorocarbon battery takes novel fluorinated graphene as a positive electrode active material and takes a lithium alloy as a negative electrode material, wherein the novel fluorinated graphene isobtained by taking thermally reduced graphene as a raw material, reacting with a fluorinating agent, treating with an alkali solution, washing and drying, granulating and the like. The novel fluorinated graphene is adopted as the positive electrode active material, and the extremely high specific surface area and excellent conductivity of the fluorinated graphene are utilized, so that the ion diffusion resistance is reduced, the internal resistance is further reduced, and the fluorinated graphene lithium battery has the characteristics of high and stable discharge platform, high specific energy, excellent rate capability and the like.