114results about How to "High electrochemical capacity" patented technology

The invention discloses an electrode plate for a lithium ion battery and a manufacturing method thereof, and particularly relates to the electrode plate for the lithium ion battery taking multi-layer graphene as a conductive agent and a manufacturing method thereof. The electrode plate of the invention consists of a positive electrode or negative electrode active substance, the conductive agent and an adhesive. The method comprises the steps of: using the positive electrode or negative electrode active substance, the conductive agent and the adhesive as raw materials to obtain electrode slurry through stirring and dispersing, and then obtaining the electrode plate through coating, drying and tabletting. The conductive agent adopted by the invention has the advantages of high dispersivity, high electric conductivity, good filling effect and the like; and the method has the advantages of simplicity, low production cost and convenient popularization and application. The method can remarkably improve the electric conductivity, electrochemical capacity and enhance charge-discharge capability of electrode materials by multiples, so the method can be widely applied to the preparation of electrode plates of lithium ion batteries.

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.

The invention discloses a silicon carbon composite material and a preparation method thereof. According to the preparation method, nano silicon powder particles are taken as a silicon substrate, a Si-C porous shell-core composite material is prepared, and the synergistic effect of silicon and carbon can be fully developed; the silicon material is high in electrochemical capacity, the carbon material is high in conductivity, and the flexible carbon material can be used for absorbing stress and buffering a volume effect of the silicon; meanwhile, the stable and firm shell-core structure can be used for maintaining the material stability; the porous structure can be used for increasing the contact structure of the silicon particles and an electrolyte and improving the compatibility of the silicon particles and the electrolyte; and the three-layer shell-core structure material is dispersed in a graphene material, the conductivity of the material can be further improved, and the capacity performance and the cycle life of an electrode material are improved.

The invention discloses a sulfur/carbon composite material for a lithium-sulfur secondary battery and a preparation method thereof. The composite material is formed by compositing a micro-pore carbon substrate with a lithium ion conduction property and elemental sulfur filled in the micro-pore structure. The carbon substrate is used as an electronic conductor in the composite material, and is further used as a lithium ion conductor, so that sulfur electrode reaction is directly carried out on a sulfur/carbon solid-solid interface in a conversion reaction manner without directly contacting with electrolyte. Therefore, the problem of circulation caused by that a polysulfide intermediate product is dissolved in the electrolyte can be solved. Compared with the other sulfur/carbon composite electrode, the composite material has the advantages of high electrochemical capacity, good circulation stability, high charging and discharging efficiency and the like; and meanwhile, the preparation method is simple and low in cost, and has a good application prospect.

The invention is about Mg-base hydrogen storage material and the method of the procedure. It has the chemical composition of Mgp-xMxNi-yNy-NieBf, M has the alternative of Al, Mn, Sn, Ca, Li, B, Na, B, Na, K, La, Ce, Nd, Pr, Y and misch metal. N has the alternative of V, Cu, Ti, Co, Fe, Ag, Cr, Zr, Se, Nb, Mo, W, Nb, C, Si and Sn, 1.0 <=p<=2.5, 0<=x<=1.0, 0<=y<=0.8, 1<=e<=3, 1<=f<=3. It has a good property under normal temperature and pressure, the electric pole that made by it has a high galvano-chemistry capability and cycle life. Its advantages include stable property; low price; extensive use of Ni-H battery, H accumulator, H power auto and fuel battery.

The invention discloses a negative pole made of a silicon/graphite nanosheet composite material of a lithium ion battery, which comprises the following components in percentage by mass: 85 to 95 percent of nanometer silicon powder-graphite nanosheet composite material, and 5 to 15 percent of polyvinylidene fluoride, wherein the content of nanometer silicon powder is between 20 and 75 percent in the nanometer silicon powder-graphite nanosheet composite material. A preparation method thereof comprises the steps of: preparing graphite oxide, preparing a mixed dispersion system of the nanometer silicon powder and graphite oxide nanosheets; adding a reducing agent, namely hydrazine hydrate into the mixed dispersion system of the nanometer silicon powder and the graphite oxide nanosheets, and reducing the graphite oxide nanosheets into graphite nanosheets to obtain a composite material of the nanometer silicon powder and the graphite nanosheets; and fully mixing the composite material of the nanometer silicon powder and the graphite nanosheets with N-methylpyrrolidone sol of the polyvinylidene fluoride, blending the mixture into paste, evenly coating the paste onto a copper coil, and performing drying and roller compaction. The negative pole made of the silicon/graphite nanosheet composite material of the lithium ion battery has high electrochemical capacity and good cycling stability performance.

A compound of formula Li_1+x(Ni_aMn_bCo_cAl_y)_1−xO₂ wherein:

a, b and c are non-zero;

a+b+c+y=1;

1.05≦(1+x)/(1−x)≦1.25;

0.015≦y(1−x);

the atomic amount of manganese representing from 95% to 100% of the atomic amount of nickel.

The invention relates to a lithium battery anode material provided with high electric capacity (more than 130 mAh/g) - LiBiSnO4 or LiBiTiO4 or LiBiPbO4 or LiInSnO4 or LiInTiO4 or LiInPbO4. The high-temperature solid state sintering preparation method for the lithium battery anode material comprises the following steps: Li2O or Bi2O3 or PbO2 and SnO2 or TiO2or PbO2 are taken as raw materials with a purity of 99.99 percent; the three raw materials are fully mixed according to the mole proportion of 1 to 1 to 2; mixture is grinded in a ball mill, and grain diameter of powder reaches 1 to 2 micrometers; the mixture is dried for 4+-2 hours under the temperature of 100+-20 DEG C; the powder is pressed into sheets and put into a high-temperature sintering furnace for burning; the sheets are crushed and pressed into sheets and then put into the high-temperature sintering furnace for the third time, and temperature is raised from room temperature to 900 to 1400 DEG C; after heat preservation for 25 to 36 hours, the sheets are cooled along with the furnace; the powder sheets are taken out and crushed, and grain diameter of the sheets after crushing is 0.5 to 1.2 micrometers; pure single-phase lithium battery anode material is prepared successfully.

The invention discloses a method for recovering lead plaster of the negative pole of a disused lead acid storage battery and application of the recovered lead plaster. A preparation method of superfine lead powder comprises the following steps: firstly, a disused battery is fully charged; secondly, the lead plaster of the negative pole is separated from the lead acid storage battery; thirdly, the main substance of the lead plaster of the negative pole is changed into a lead raw material mainly composed of PbO and Pb via high temperature and humidity solidification; and lastly, dry grinding or crumbling of the lead raw material is carried out under the condition of oxygen, or wet treatment is carried out by using organic salt and organic acid to obtain superfine lead powder. The recovery method disclosed by the invention is low in cost, simple and convenient in process, high in recovery rate of lead, low in energy consumption and easy to achieve industrialization, and causes minor pollution to the environment during recovering the lead. The method directly prepares superfine lead powder which can be directly used to produce storage batteries. The superfine PbO powder prepared by the method has good performance, is high in technology added value, and can obtain a battery pole plate which has high electrochemistry capacity and a long charging/discharge service life.

The invention belongs to the field of electrochemistry and particularly relates to a high-capacity lithium-enriched positive electrode material and a reparation method thereof. The molecular formula of the high-capacity lithium-enriched positive electrode material is Li[Li<x-beta>Na<beta>Mn<1-y-z-alpha>Co<y>Ni<z>Y<alpha>]O2, wherein x is more than or equal to 0 and less than or equal to 0.6, y is more than 0 and less than or equal to 0.4, z is more than 0 and less than or equal to 0.4, alpha is more than or equal to 0 and less than or equal to 0.1 and beta is more than or equal to 0 and less than or equal to 0.2; the result of (1-y-z-alpha) is more than 0 and the result of (x-beta) is more than 0. The lithium-enriched positive electrode material containing Na and Y has the characteristics of low first-time irreversible capacity, large electrochemical capacity, high cycling stability, excellent rate performance and the like. The preparation method has the advantages that a preparation process is simple, raw materials are cheap and easily available, the cost is low, the high-temperature calcination time is very short, the repeatability is good and the industrialization is easy to realize.

The invention relates to titanium acid lithium battery cathode material containing rare metal elements, which comprises a synthesized lithium titanate material. A or a plurality of rare metal elements are contained in the lithium titanate material; the rare metal elements adopt Zr, Al, La, Ce, Pr, Nd, Sm and Dy or Ho; the contents of the rare metal elements are 0.01-3 wt percent by oxidate; the lithium and titanium molar ratio in the lithium titanate material is 0.7-1.2; and the titanium acid lithium battery cathode material is produced by adopting the processes of material mixing, ball milling and sieving, high-temperature treatment, secondary ball milling, high-temperature heat preservation and the like. The titanium acid lithium battery cathode material containing the rare metal elements is doped with the rare metal elements, improves the quick charging and discharging properties, improves the electrochemical capacity and has excellent cycle performance, good repeatability and high consistency; and furthermore, the titanium acid lithium battery cathode material has the advantages of low raw material cost, short synthesis time, low temperature, low requirements for equipment and simple manufacturing process and is suitable for industrial scale production.

The present invention discloses a method for preparing lithium-rich manganese-based cathode material. The method comprises: dispersing α-MnO₂ micron particles, a nickel salt and a lithium-containing compound in a solvent to obtain a mixture, then evaporating the mixture to remove the solvent, and calcining the solid product obtained from the evaporation; wherein the lithium-containing compound is a lithium salt and/or lithium hydroxide. The present invention also provides a lithium-rich manganese-based cathode material prepared by the above method. The present invention also provides a lithium-ion battery of which anode material contains the foregoing lithium-rich manganese-based anode material. The lithium-rich manganese-based cathode material provided by the present invention has high rate capability and prolonged cycle stability.

The invention discloses an electrochemical insertion/deinsertion magnesium ion electrode with high capacity and stable circulation and a preparation method. The active material of the electrode is a composite nano-material of graphene nano-sheets and MoS2, and the balance is acetylene black and polyvinylidene fluoride. The mass percentage of each component is: 75-85% of active material of composite nano-material, 5-10%of acetylene black and 10% of polyvinylidene fluoride, wherein the mass ratio of the graphene nano-sheets and the MoS2 nano-material in the active material of composite nano-material is 1 to 1-4 to 1. The preparation method of the electrode comprises the following steps of: using graphite as a raw material to prepare graphite oxide nano-sheets with a method of chemical oxidation; in the presence of the graphite oxide nano-sheets, compounding to obtain the composite nano-material of the graphene nano-sheets/ MoS2 with a one-step hydrothermal in-situ reduction method; and finally using the composite nano-material of the graphene nano-sheets/ MoS2 as the active material to prepare the electrode. The electrode has not only high electrochemical magnesium intercalating reversible capacity but also good stable circulation property and is widely applied to the new generation of magnesium ion batteries.

This invention relates to an electrode active material used in Li ionic batteries and its preparation method, in which, the material is prepared by depositing a nm compound film made up of Li₂S and a transition metal element Co with pulse laser and the size of the compound is smaller than 50nm, the specific volume is varied in the sphere of 400-650mAh/g along with the difference of Co and presents very good stability in the repeated charge/discharge process.

The invention relates to a method for preparing ultra-dispersed antimony selenide nanowires for sodium-ion battery negative electrodes with an ultrasonic-assisted hydrothermal method. The method includes: adding beta-cyclodextrin into distilled water, and performing ultrasonic oscillation to obtain a solution A; adding tartaric acid and antimony potassium tartrate into distilled water with stirring to obtain a solution B; dispersing selenium powder into hydrazine hydrate, and performing ultrasonic oscillation to obtain a wine red solution C; adding the solution B into the solution A drop by drop with stirring to obtain a mixed solution D; adding the wine red solution C into the mixed solution D drop by drop, and stirring evenly prior to hydrothermal reaction at the temperature of 130-180 DEG C for 3-24h to obtain the ultra-dispersed antimony selenide nanowires for sodium-ion battery negative electrodes. The ultra-dispersed Sb2Se3 nanowires for sodium-ion battery negative electrodes are prepared by adopting the rational additives and surfactants to effectively and successfully control the reaction process under the assistance of ultrasonic waves, and the method has the advantages of good reproducibility, high raw material utilization rate and short cycle and is applicable to large-scale production of Sb2Se3 electrode materials.

The invention relates to the anode material used by lithium battery with high capacity (bigger than 127mAh/g), which comprises LiSbSnO4, LiSbTiO4, LiSbPbO4, LiSbMnO4, LiBiMnO4, LiInMnO4, LiAlMnO4 LiAlSnO4 or LiAlTiO4. The preparation method comprises the steps: one in Sb2O3, Al2O3, Bi2O3 or In2O3, one in SnO2, MnO2, TiO2 or PbO2 and Li2O are taken as raw materials to be fully mixed with a molar ratio of 1:2:1 and then ball milled in a ball mill; particle diameter of the powder is 1-2 micrometers; the powder is parched for 4 hours under a temperature of 100 DEG C and is planished tablet to be sintered in a high-temperature sintering furnace. The temperature of the furnace is raised to 250-500 DEG C; the powder is put into the high-temperature sintering furnace for the third time and the temperature is raised to 900-1400 DEG C from the room temperature; then the pure anode material of the single-phase lithium battery is successfully prepared.

A preparation method of a nest-like Sb2Se3 electrode material for a sodium ion battery negative electrode comprises the following steps: 1) dissolving antimony potassium tartrate into deionized water, and completely stirring to completely dissolve the antimony potassium tartrate to obtain a mixed liquid A; 2) dispersing selenium powder into hydrazine hydrate with mass percentage being 50 percent, and stirring to obtain a mixed liquid B; 3) mixing the obtained mixed liquid B and the mixed liquid A to obtain a mixed liquid C, performing hydrothermal reaction at the temperature of 120 to 180 DEG C for 3 hours to 24 hours, naturally cooling to a room temperature after the reaction, washing and separating precipitate, and freeze-drying the precipitate obtained by separation under the vacuum condition to obtain the Sb2Se3 electrode material. The preparation method is simple in operation, easy in repletion, short in cycle, pollution-free and suitable for large-scale production of the Sb2Se3 electrode materials.

The invention discloses an enhanced super capacitor and a preparation method thereof, especially an electrolyte, a super capacitor based on the electrolyte and including an anthraquinone redox activesubstance, and a preparation method of the super capacitor. The electrolyte comprises a support electrolyte, the anthraquinone redox active substance and a solvent. The novel super capacitor has a higher specific capacitance compared with that of common carbon-based super capacitors, and obvious advantages in the capacitive performance compared with a super capacitor made of the same electrode material but does not include the anthraquinone redox active substance. A simple method is used, the circulation stability of the carbon-based super capacitor is improved, the capacitive performance of the carbon-based super capacitor is improved effectively, and the prepared super capacitor is characterized by high specific capacity, high energy density and high power density, and has huge application potentials.

A method for preparing orthogonal crystallization system LiMnO2 includes dissolving bivalent Mn compound, MnO2 and LiOH as mole raio of 1 : 1 : 7.5-30 in distilled water, agitating it for 4-6 hours in the air at room temperature, filling it into high pressure reactor to react for 5-7 days at constant temperature of 170-230 deg c, washing it by thin oxalic acid to make it be neutral in pH value after it is taken out from reactor, washing it by distilled water or deionized water and finally drying precipitant for obtaining LiMnO2 powder product.

The invention belongs to the technical field of storage batteries, and specifically relates to a lead plaster composition of a positive electrode of an internally formalized storage battery. The lead plaster composition of the positive electrode of the internally formalized storage battery is prepared from the following raw materials in parts by weight: 990-1010 parts of lead powder, 0.5-1.5 parts of fibers, 0.5-1.0 part of phosphoric acid, 1-2 parts of antimonous oxide, 0.7-1.2 parts of zinc oxide, 0.5-1.5 parts of aluminum oxide, 0.5-0.8 part of ammonium hydrogen carbonate, 0.3-0.5 part of cerium hydroxide, 0.7-1.5 parts of tin monoxide, 110-130 parts of water and 80-90 parts of dilute sulphuric acid. The lead plaster composition of the positive electrode is improved, so that capacity attenuation of the internally formalized battery in the early stage is inhibited, and the service life of deep circular discharge of the battery is prolonged.

The invention discloses an anode material-nanometer vanadium iron manganese lithium phosphate of a lithium ion battery and a preparation method of the anode material. The anode material comprises carbon-coated nanometer vanadium iron manganese lithium phosphate, the primary particle size is 50-200 nm, and a chemical formula of nanometer vanadium iron manganese lithium phosphate is LiVxFeyMn(1-3/2x-y)PO4, wherein x is more than 0 and not more than 0.3 and y is more than 0 and not more than 0.5. The preparation method adopts an electrochemical-rheological phase method and comprises the steps of preparing a precursor, spray-drying and roasting. The anode material has the advantages of high specific energy and specific capacity and good safety; and the preparation method is easy for acquisition of raw materials, simple in process and low in production cost, and is suitable for large-scale industrial production.

The invention relates to a new method for comprehensively recovering LiCoO2 from waste lithium cathode material industrially. The method comprises the following steps of: peeling the waste lithium ion battery material, separating out cathode material, and then mechanically crushing the separated cathode material; placing the crushed material into a hydrogen producing machine; adding excessive NaOH into the hydrogen producing machine for soaking the crushed cathode material at a room temperature; and after the reaction is finished, filtering the reactant, and obtaining the filter residue, i.e. a mixture containing LiCoO2, acetylene black and few conductive agent. After the mixture is dried, the mixture can be used as anode material of a Ni/Co battery, and a good electrochemical property can be shown. The method provided by the invention has the following advantages of simple manufacturing process, easily-obtained raw material, easiness for operation and environmental-friendliness, and provides a new environment-friendly and low-cost production technique for the anode material of the Ni/Co battery.