26 results about "Lithium" patented technology

The invention provides a nonaqueous-electrolyte battery which has a positive electrode 3 including a positive active material, a negative electrode 4 including a negative active material having a lithium insertion/release potential higher than 1.0 V (vs. Li/Li⁺), and a nonaqueous electrolyte, wherein an organic compound having one or more isocyanato groups has been added to the nonaqueous electrolyte.

The invention discloses a coating modification method for improving performance of a rich-lithium manganese-base positive electrode material. The rich-lithium manganese-base positive electrode material is arranged in the material, wherein the rich-lithium manganese-base material is Li[LixMn1-x-yMy]O2; praseodymium phosphate is arranged on a surface layer of the material; intermigration of a transition metal ion, a phosphate radical and a praseodymium ion exists in a coating process; and a new phase capable of conducting an ion and an electron is generated on an interface. The method comprises the following specific steps of ultrasonically dispersing the rich-lithium manganese-base material in secondary water or an organic solution to form a disperse and uniform suspension; dissolving praseodymate in the suspension; adding phosphoric acid or phosphate to allow a phosphate radical ion and the praseodymium ion to perform a precipitation reaction on the surface of the rich-lithium manganese-base material; generating an initial coating layer; obtaining slurry comprising the initial coating layer; and finally drying the obtained slurry and then calcinating the slurry to obtain the rich-lithium manganese-base anode composite powder material comprising a praseodymium phosphate coating layer. The rich-lithium manganese-base composite material comprising the praseodymium phosphate coating layer prepared by the method is low in cost, high in capacity, high in first efficiency, low in voltage drop, good in stability and good in rate performance.

The invention provides a lithium ion secondary cell cathode and a cell. The lithium ion secondary cell cathode comprises a conductive agent, graphite, a caking agent and a current collecting body; the graphite is formed by mixing first graphite and second graphite by weight percentage of 5-30 to 95-70; the average particle diameter of the first graphite is between 0.5 and 2 mu m; the average particle diameter of the second graphite is between 4 and 12 mu m, wherein the graphite is coated-type graphite coated with a coating agent; and the coating agent is 1 to 20 weight percent of gross weight of the graphite. The average particle diameter of the first coated-type graphite is between 0.8 and 2.3 mu m; and the average particle diameter of the second coated-type graphite is between 5 and 13 mu m. The provided cathode has excellent large-current discharging performance and is in particular suitable for application of a power cell.

A phosphor-contained solar cell comprises a photoelectric conversion layer for conversing the photo energy to electrical energy; a phosphor layer, disposed on at least one side of the photoelectric conversion layer, for improving the photoelectric conversion efficiency; the phosphor is up conversion phosphor or down conversion phosphor; wherein the up conversion phosphor is selected from X₂Mo₂O₉:X or X₂Mo₂O₉:X,X; the down-conversion phosphor is selected from JQX(PO₄)₂:X³⁺ or JQX(PO₄)₂:X²⁺,X²⁺; wherein X represents anyone of rare earth metal, J represents lithium, sodium or potassium, Q represents anyone of alkaline earth metal.

The invention discloses a low-cost high-strength dolomite earthen-ware green body, which is obtained by sintering a base material and an additive in a polybasic compound flux system, wherein the base material comprises 25-35wt% of elutriation slurry, 10-15wt% of black clay, 0-1wt% of bentonite, 5-6wt% of pyrophyllite, 12-25wt% of low-temperature sand, 3-8wt% of lithium porcelain stone, 5-12wt% of dolomite, 6-12wt% of black talc, 6-10wt% of limestone, 8-15wt% of diopside, 0-5wt% of Yongchun coarse-grained soil, and 0-5wt% of waste porcelain powder; and the additive is a nano organic silicon solution, and the weight percentage of the additive relative to the base material is 1-3%. According to the low-cost high-strength dolomite earthen-ware green body disclosed by the invention, the addition of a polybasic compound flux especially the addition of lithium and the nano organic silicon solution greatly reduces the firing temperature; moreover, as the nano organic silicon solution forms mullite crystals at low temperature and the lithium can easily form a high-strength glass phase during low-temperature firing, the strength of the green body is improved, and the green body can be easily degraded.

The invention relates to a Na<+> superionic conductor (NASICON) type lithium-ion solid electrolyte collaboratively doping with F<->, B<3+> and Y<3+> ions and a preparation method thereof. The stoichiometric equation of the solid electrolyte is Li<1+x+2y-z>Y<x>Zr<2-x>B<y>P<3-y>O<12-z>F<z>, wherein x is equal to 0.1 to 0.5, y is equal to 0.1 to 0.3, and z is equal to 0.1 to 0.2. The NASICON type lithium-ion solid electrolyte collaboratively doping with the F<->, B<3+> and Y<3+> ions is obtained by uniformly mixing Y(NO3)<3>.6H2O, B2O3, LiF, ZrOCl<2>.8H2O, (NH4)<2>HPO4 and LiNO3 according to a mole ratio of being (0.1-0.5):(0.05-0.15):(0.1-0.2):(1.5-1.9):(2.7-2.9):(1.1-2.0) and carrying out heating, stirring, drying, ball grinding, pressing and sintering. The normal-temperature lithium ion conductivity of a solid electrolyte slice prepared according to the method is more than 5*10<-4> S/cm.

Disclosed are copper foil or net comprising a Cu-nitrile compound complex formed on the surface thereof, a method for preparing the same, and a lithium secondary battery that comprises an electrode using the same copper foil or net as a collector. The lithium secondary battery, which uses a copper collector comprising a Cu-nitrile compound complex formed on the surface thereof through the application of a certain voltage level, can prevent the corrosion of Cu occurring at a voltage of 3.6V or higher under overdischarge conditions away from the normal drive condition, and thus can significantly improve the capacity restorability after overdischarge.

A method for producing a slurry for a heat-resistant layer for a lithium ion secondary battery, including: a step of producing a polymer aqueous dispersion by polymerizing a monomer in an aqueous medium to give a polymer aqueous dispersion containing a polymer with a polymerization conversion rate of 90 to 100%, a step of obtaining a mixed solution by mixing N-methylpyrrolidone and the polymer aqueous dispersion, a step of obtaining a binder composition by removing an unreacted monomer and the aqueous medium from the mixed solution, and a step of obtaining a slurry by dispersing non-conductive microparticles in the binder composition, wherein the step of obtaining the binder composition includes removing the aqueous medium and the unreacted monomer by using a distillation column under a reduced pressure so that the binder composition contains the unreacted monomer and a water content in predetermined amounts.

The invention relates to the technical field of batteries, in particular to a lithium-rich anode material and a preparation method thereof. The preparation method comprises special steps: dissolvable Ni slat, Co salt, Mn salt and Li salt are firstly dissolved in an appropriate amount of organic alcohol solution according to a stoichiometric ratio, and a metal salt solution with a certain concentration is prepared; then, oxalic acid is dissolved in the organic alcohol solution, and an oxalate solution with a certain concentration is prepared; then, the metal salt solution and the oxalate solution are mixed to form a co-precipitation solution, the co-precipitation solution is aged, filtered and dried, so that a precipitate precursor is obtained; finally, the precursor is subjected to high temperature sintering, and the lithium-rich anode material xLi2MnO3.(1-x)LiMO2 (M is Co, Mn, Ni, Ni1/2Mn1/2, or Ni1/3Co1/3Mn1/3) is obtained. The preparation cost of the method is lower, and the shape and the size of the lithium-rich anode material are easier to control.

The invention discloses stainless steel crucible paint used for smelting an aluminum-lithium alloy as well as a preparation method thereof and a coating method thereof. In raw materials of stainless steel crucible paint, a binder accounts for 40-60% of all components, wherein aggregates are Y2O3 powder with grain size of 800-1000 meshes. The preparation method comprises the following steps: (1) uniformly mixing Al(OH)3 and MgO, adding water and phosphoric acid, and stirring to heat to a temperature of 50-80 DEG C; (2) adding aluminum powder, CrO3, zinc chrome and Y2O3 powder, and uniformly stirring; and (3) performing ball-milling mixing. The coating method comprises the following steps: grinding the inner surface of a stainless steel crucible, and heating the inner surface to a temperature of 70-90 DEG C; spraying paint to the inner surface of the crucible by a spray gun, heating up to a temperature of 800-850 DEG C to preserve heat after air-drying, and cooling along with a furnace.The paint disclosed by the invention has good thermal shock property and good chemical stability.

The invention discloses comb polymer electrolyte and preparation and application thereof; the comb polymer electrolyte has a chemical structural formula shown as formula I that is shown in the description, wherein a is an integer of from 10 to 800, x is 0.2 to 0.8, ax is a positive integer, m is an integer of from 3 to 29, n is an integer of from 1 to 31, and R is hydrogen atom or methyl. The keychemical formula structure of comb polymer, keying mode of main and side chains, substitution rate, integral synthetic pathway setting for the corresponding preparation method and parameter conditionsof process steps are modified so that the main and side chains of the comb polymer are keyed via ion keys, and the problem that polyoxyethylene polymer electrolyte has high crystallinity and low lithium ion transfer capacity can be effectively solved.

The present invention relates to a method of preparing a positive electrode active material for a lithium secondary battery and the positive electrode active material for the lithium secondary battery prepared thereby, and more specifically, to a method of preparing a positive electrode active material for a lithium secondary battery, the method comprising doping or coating the positive electrode active material for the lithium secondary battery with a predetermined metal oxide, and the positive electrode active material for the lithium secondary battery which is prepared thereby and has a reduced amount of residual lithium.

A process for the preparation of a 1,3-butadiene and styrene copolymer comprising the following steps: a) anionically polymerizing a blend comprising from 5% by weight to 40% by weight of styrene and from 60% by weight to 95% by weight of 1,3-butadiene, with respect to the overall weight of the mixture, in the presence of at least one hydrocarbon solvent, of at least one lithium-based catalyst having the general formula LiR1 wherein R1 represents a linear or branched C3-C10 alkyl group, and of least one polar modifier; b) optionally, reacting the copolymer obtained in step (a) with at least one chain-end monomer selected from 1,3-butadiene, styrene and a-methylstyrene; c) reacting from 10% by weight to 70% by weight, preferably from 20% by weight to 50% by weight, of the lithium-terminated polymeric chains present in the copolymer obtained in step (a) or in step (b), with at least one coupling agent selected from liquid polyepoxides having at least three reactive sites capable of reacting with the carbon-lithium chain-ends; d) optionally, reacting the copolymer obtained in step (c) with at least one chain-end monomer selected from 1,3-butadiene, styrene and a-methylstyrene; e) reacting the linear polymeric chains remaining in the copolymer obtained in step (c) or in step (d), with at least one tin compound having the general formula XSn(R2)3 wherein X represents a halogen atom such as, for example, chlorine and R2 represents a linear or branched C1-C10 alkyl group.

The invention discloses an Al-Li-Zr aluminum-lithium alloy which has flame-retardant performance while being smelted under the temperature of 700-800 DEG C, and a processing technology thereof. The alloy comprises the following chemical components in percentage by weight: 2.0-8.0% of Li, 1.0-3.0% of Zr, 2.0-8.0% of Sr, 0.2-0.3% of Ho, 0.8-1.2% of Y, 0.1-0.2% of Th, 0.1-0.2% of Sc, 0.2-0.4% of S, 0.1-0.4% of B, and the balance aluminum. The Al-Li-Zr aluminum-lithium alloy is extremely outstanding in flame retardant performance in a static state; after being subjected to temperature maintainingand standing for 5 hours under the temperature of 700-800 DEG C, the Al-Li-Zr aluminum-lithium alloy is free from obvious combustion; when the Al-Li-Zr aluminum-lithium alloy in a dynamic process suchas the liquid alloy melt processing processes like stirring and air blowing, a surface film which is damaged due to strong stirring can be quickly regenerated, so that the oxidization and combustionof the alloy can be stopped successfully; the obtained aluminum-lithium alloy material has the mechanical property of traditional aluminum-lithium alloy at a room temperature; the yield strength of the alloy at the temperature of 300 DEG C is 350-400 MPa, and the yield strength of traditional material under the temperature of 300 DEG C is about 250-300 MPa.

The invention discloses a low-voltage excited derivative-free rare earth alloy negative oxygen ion releasing cluster. The cluster includes a cluster wire and a double-stranded handle body used for fixing the cluster wire, wherein the handle body is connected with a negative ion generator, and the handle body and the cluster wire are made of silver, copper, alum and lithium alloys added with rare earth. The cluster is advantaged in that not only the number of discharge tip filaments achieving high-dose anion release is ensured, but also derivatives such as ozone are not produced, drawbacks of a traditional negative ion released electrode excitation voltage and high cleaning difficulty are overcome, after negative ions are separated from filament tips, a spiral cluster head electrode pushes the negative ions forward due to the charged particle anisotropy repulsion principle to form negative ion spiral waves, in the forward advancement process, the coverage radius of the negative ions is enlarged and the penetrating kinetic energy of the negative ions is increased to form the indoor negative ion bath environment, and a new method is provided for urbanites to create the indoor negative oxygen ion bath recuperation environment, return to the nature, improve the body health and improve the self-healing power.