337results about How to "Stable crystal structure" patented technology

The invention is directed to a solid ion conductor which has a garnet-like crystal structure and has the stoichiometric composition L_7+xA_xG_3−xZr₂O₁₂, wherein

• • L is in each case independently a monovalent cation,
  • A is in each case independently a divalent cation,
  • G is in each case independently a trivalent cation,
  • 0≦x≦3 and
  • O can be partly or completely replaced by divalent or trivalent anion.

The invention provides a high nickel anode material, which comprises a base body and a coating layer, wherein aluminum (Al), titanium (Ti), magnesium (Mg), zirconium (Zr), calcium (Ca), zinc (Zn), boron (B), fluorine (F), vanadium (V), strontium (Sr), barium (Ba), yttrium (Y), neodymium (Nd), caesium (Cs), tungsten (W), molybdenum (Mo), ruthenium (Ru), rubidium (Rb) or lanthanides are mingled on the surface of the base body, the coating layer is coated on the surface of the base body, and comprises one or more of the magnesium, the titanium, the zirconium, the fluorine, the boron, the aluminum and phosphate. The elements are mingled on the surface of the base body of the high nickel anode material, the mingled elements can stabilize a surface crystal structure of the base body, remit damage of washing liquid to a material surface structure of the base body, and enable capacity and cycle performance of a lithium ion battery which is prepared through the high nickel anode material to be better. Furthermore, the high nickel anode material is provided with the coating layer, and the coating layer enables the high nickel anode material to separate from an electrolyte part, and improves electrochemical stability and safety of the high nickel anode material. The invention further provides a method for preparing the high nickel anode material and a lithium ion battery.

The invention relates to a method for preparing a lithium ion battery anode material doped with a nanometer oxide, belonging to the technical field of manufacturing processes of lithium ion battery batteries. The method is characterized in that trace amount of nanometer oxide power is doped in the preparation process of lithium manganate, lithium cobaltoxide and lithium iron phosphate; the doping amount is 0.5-1.0 mol percent of lithium salts; and the nanometer oxide is selected from one or two of alumina, magnesia, titanium oxide, chromic oxide, nickel oxide, monox and zirconia and the nanometer oxide is subject to ball milling, drying, sieving, calcinating, crushing, grading and other processes to obtain the nanometer oxide doped or coated lithium ion battery anode material. The lithium ion battery anode material has reversible initial capacitance, and remarkably-improved attenuation property, charging-discharging properties, high-temperature circulating property and electrochemistry stability.

The invention belongs to the technical field of anode materials for lithium ion batteries and particularly discloses a doped monocrystal multi-component material for lithium ion batteries and a preparation method of such doped monocrystal multi-component material. The doped monocrystal multi-component material and the preparation method thereof have the advantages that nickel-cobalt-manganese ternary materials are modified, and M-source metals are doped when a precursor is prepared to decrease the material sintering temperature and improve material tapping density, so that the mixed arrangement degree of Ni<2+> in a Li<+> layer is weakened obviously; through high-temperature sintering and tempering processes, the precursor of the multi-composite material, prepared through a coprecipitation method, is more stable in crystal structure, metal ions in the material are inhibited from dissolving through surface coating, side reaction between the metal ions and electrolyte is inhibited, and stability and electrochemical performance of an active material are further enhanced; a doped monocrystal multi-component material finished product is stable in crystal structure, high in safety and compaction density and excellent in rate capability and cycle performance, so that specific capacity and charge-discharge voltage of the material are further enhanced; the preparation method is small in doping quantity, simple to operate, easy to control, widely applicable and suitable for large-scale production.

To provide an aluminum magnesium titanate crystal structure which can be used stably in variable high temperatures, because of its excellent heat resistance, thermal shock resistance, high thermal decomposition resistance and high mechanical property, and a process for its production.

An aluminum magnesium titanate crystal structure, which is a solid solution wherein at least some of Al atoms in the surface layer of aluminum magnesium titanate crystal represented by the empirical formula Mg_xAl_2(1−x)Ti_(1+x)O₅ (wherein 0.1≦x<1) are substituted with Si atoms, and which has a thermal expansion coefficient of from −6×10⁻⁶ (1/K) to 6×10⁻⁶ (1/K) in a range of from 50 is to 800° C. at a temperature raising rate of 20° C./min, and a remaining ratio of aluminum magnesium titanate of at least 50%, when held in an atmosphere of 1,100° C. for 300 hours.

A non-aqueous electrolyte secondary battery has a positive electrode (11) containing a positive electrode active material, a negative electrode (12) containing a negative electrode active material, and a non-aqueous electrolyte solution (14) in which a solute is dissolved in a non-aqueous solvent. The positive electrode active material is obtained by sintering a titanium-containing oxide on a surface of a layered lithium-containing transition metal oxide represented by the general formula Li_1+xNi_aMn_bCo_cO_2+d, where x, a, b, c, and d satisfy the conditions x+a+b+c=1, 0.7≦a+b, 0≦x≦0.1, 0≦c/(a+b)<0.35, 0.7≦a/b≦2.0, and −0.1≦d≦0.1.

The invention discloses a modification method of a single crystal ternary positive electrode material. The method comprises the following steps: mixing a precursor containing nickel, cobalt and manganese elements with a dopant metal soluble salt, adding pure water, uniformly stirring, and carrying out spray drying to obtain a pretreated precursor; carrying out low-temperature sintering on the pretreated precursor in an oxidizing atmosphere to obtain a low-temperature sintered product; and uniformly mixing the low-temperature sintering product with a lithium source, and carrying out high-temperature sintering in an oxidizing atmosphere to obtain the doped and modified single-crystal ternary positive electrode material. According to the invention, the precursor and the dopant are pre-sintered at a low temperature, most of the pre-sintered dopant uniformly coats the surface of the precursor in an oxide form, and then the pre-sintered precursor and the lithium salt are sintered at a high temperature, so that the dopant is prevented from forming an oxide coating layer on the surface of the ternary positive electrode material, and the internal resistance of the ternary positive electrodematerial is reduced; and the cycling stability of the lithium-ion battery is greatly improved.

The invention discloses a method for preparing a high-nickel cathode material for a lithium secondary battery. The method comprises the steps of weighing and uniformly mixing a nickel-cobalt-manganesecompound, a lithium salt and an additive I; calcining the mixture in two stages at high temperature in an oxygen atmosphere; cooling, sieving, water-washing the mixture; and mixing the mixture with an additive II for secondary sintering so as to obtain the high-nickel ternary cathode material, wherein the lithium salt is a mixed lithium salt of lithium carbonate and lithium hydroxide, and the lithium carbonate and the lithium hydroxide can be mixed in any mixing ratio. The method can prepare a material having a large capacity and excellent cycle performance, can reduce the amount of highly-corrosive lithium hydroxide, improves the preparation environment of high-nickel materials, cancels out the impact of lithium hydroxide price fluctuation on the price of the high-nickel ternary material, and has a good application prospect.

The invention discloses a coated and modified high-nickel ternary cathode material and a preparation method thereof. With a LiNi<x>Co<(1-x)/2>Mn<(1-x)/2>O<2> material as a matrix, wherein x is smaller than or equal to 0.9 and greater than or equal to 0.6; a coating layer coats the outside of the matrix; the coating layer contains a plurality of nano metal salts and/or nano metal oxides; and the total weight of cationic metal accounts for 0.01%-10% of weight of a ternary cathode material. The preparation method disclosed by the invention comprises the following steps: firstly, dissolving a soluble aluminum salt into deionized water to obtain an aluminum salt solution; adding the LiNi<x>Co<(1-x)/2>Mn<(1-x)/2>O<2> material to the aluminum salt solution for mixing evenly to obtain paste; adding an alkaline solution which is prepared from an alkaline metal compound to the paste until the pH value is greater than or equal to 7.0; and carrying out drying, sintering, natural cooling, crushing and sieving, and then obtaining the coated and modified high-nickel ternary cathode material. According to the coated and modified high-nickel ternary cathode material, the alkalinity of a high-nickel material is lowered; the coated and modified high-nickel ternary cathode material is high in processability and excellent in cycle performance and safety performance.

The present invention provides a zirconia-ceria-yttria-based mixed oxide having a stable crystal structure after 12 hours of heat treatment at 1100° C. under a reducing atmosphere, and a process for producing the mixed oxide.

A lithium secondary battery having high capacity and good charge-discharge cycle performance is provided. The lithium secondary battery includes a negative electrode (2) containing silicon as a negative electrode active material, a positive electrode (1) containing a positive electrode active material, and a non-aqueous electrolyte. The positive electrode active material is a lithium-transition metal composite oxide including a layered structure represented by the chemical formula Li_aNi_xMn_yCO_zO₂, where a, x, y, and z satisfy the expressions: 0≦a≦1.3, x+y+z=1, 0<x, 0≦y≦0.5, and 0≦z.), and the theoretical electrical capacity ratio of the positive electrode to the negative electrode (positive electrode/negative electrode) is 1.2 or less.

The invention discloses a sodium ion battery anode material and a sodium iron battery comprising the anode material, and belongs to the technical field of energy source materials. The sodium ion battery anode material comprises a conductive additive and Na3-xM2LO6, wherein x is greater than or equal to 0 and smaller than 2; M is one or more of Fe, Co, Ni, Cu, Zn, Mg, V and Cr; L is one or more of Sb, Te, Nb, Bi and P. The preparation method comprises the steps of mixing sodium carbonate, M oxide and L oxide according to a stoichiometric proportion, ball-milling, calcining and ball-milling so as to obtain the sodium ion battery anode material. The sodium ion battery anode material has the advantages of high sodium storage capacity, good stability and excellent rate capability, and has extremely high energy density and power density; the assembled sodium iron battery has extremely good cycling stability, is green and clean, safe and environmentally friendly and low in cost, and is an extremely excellent electrochemical energy storage system; moreover, the preparation method of the anode material is extremely simple, and raw materials are low in price and easily available.

The invention belongs to the technical field of lithium batteries, and provides a Y/La-doped Co/B co-coated nickel-cobalt-manganese ternary positive electrode material and a preparation method thereof. According to the present invention, the cycle performance and the safety performance are improved by doping a small amount of Y<3+> ions and La<3+> ions, wherein Y<3+>/La<3+> and Ni<3+> have the same valence state, the doped Y<3+>/La<3+> can enter the metal Ni<3+> position, the Y<3+>/La<3+> does not produce the valence change during the charge and discharge, is electrochemically inert, and doesnot produce the valence state change during the charge and discharge so as not to produce the volume change, such that the Y<3+>/La<3+> can act as the skeleton, stabilize the crystal structure, and improve the cycle life and the safety performance of the material; and under the high voltage, the Co/B co-coated positive electrode material can effectively improve the cycle performance and the electronic conductivity of the battery, reduce the residual alkali, and reduce the flatulence, such that the co-coated nickel-cobalt-manganese ternary positive electrode material can effectively prevent theoccurrence of side reactions so as to improve the cycle performance and the electrochemical performance of the lithium battery.

The positive electrode active material of the invention has an olivine structure, and is represented by Li_xM_1-xMnPO4 (where 0<x≦1, and M is an alkali metal element that is larger in ion radius than Li), and has a construction in which the inter-layer interval of MnO₆ layers in the Li_xM_1-xMnPO₄ is larger than the inter-layer interval of the MnO₆ layers contained in LiMnPO₄ as a reference substance.

The present invention provides a raw material composition for preparing a sintered body of aluminum titanate, the composition comprising (i) 100 parts by weight of a mixture comprising 40 to 50 mol % of TiO₂ and 60 to 50 mol % of Al₂O₃, (ii) 1 to 10 parts by weight of an alkali feldspar represented by the formula: (Na_xK_1−x)AlSi₃O₈ (0≦x≦1), and (iii) 1 to 10 parts by weight of at least one Mg-containing component selected from the group consisting of a Mg-containing oxide with spinel structure, MgCO₃ and MgO, and a process for preparing a sintered body of aluminum titanate comprising sintering a formed product prepared from the raw material composition at 1300 to 1700° C. According to the present invention, a sintered body of aluminum titanate having high mechanical strength and ability to be stably used at high temperatures, as well as its inherent properties of low coefficient of thermal expansion and high corrosion resistance, can be obtained.

The invention provides an aluminium alloy material. The aluminium alloy material is composed of, by mass, 5.5 to 8.5% of silicon, 0.1 to 0.4% of magnesium, 0.01 to 0.2% of boron, chromium<0.05%, 0.05 to 0.5% of iron, strontium<0.1%, and aluminium and inevitable impurities, wherein the content of each impurity element is less than 0.05%. The aluminium alloy possesses high heat-conducting properties, and excellent forming properties, and mechanical properties; thermal conductivity is higher than 140W/m.k under common pressure casting conditions; thermal conductivity is even higher than 150W/m.k under gravity casting or extrusion casting conditions; the aluminium alloy can be applied to the field of mobile phone product and communication product, can be used for solving problems in the prior art that thermal conductivity properties of materials used in mobile phone products and communication products are poor, product heat dissipation performance is poor, and severe heating phenomenon is caused. The invention also provides an aluminium alloy shaped part prepared from the aluminium alloy, and a preparation method of the aluminium alloy shaped part.

The invention discloses a lithium ion battery gradient anode material and a preparation method thereof. The average composition formula of the material is Li0.3+deltaNixCoyMnzD1-x-y-zO2, delta is notsmaller than 0 and not larger than 0.9, x is not smaller than 0.3 and not larger than 1, y is not smaller than 0 and not larger than 0.4, z is not smaller than 0 and not larger than 0.4, D is one or more of Mo, Ca, Mg, Fe, Zr, Ti, Zn, Y, W, V, Nb, Sm, La, B, Al and Cr, and the content of the doping element D is continuously increased from the particle core to the surface. According to different rates of different regions in the spherical material, doping elements are optimally distributed; in the precipitation process, by changing the contents of the doping elements in different stages, the lithium ion transmission rate in the crystal structure inside the material is increased, then, the rate capability of an existing multi-element material is improved, and the cycle life of the material is prolonged; the process is continuous and controllable, operation is easy, the cost is low and the material is suitable for large-scale production.

A magnetic recording medium comprises: (a) a non-magnetic substrate having a surface; and (b) a stack of thin film layers on the substrate surface, including a layer of a magnetic alloy material with a stabilized hexagonal close-packed (“hcp”) crystal structure, comprising: (i) a major amount of a ferromagnetic element with a first hcp crystal structure having a first c/a ratio, where “c” is a lattice parameter of the unique symmetry axis of the hcp structure along which a preferred direction of magnetization lies and “a” is a lattice parameter along a direction perpendicular to the c axis; (ii) a minor amount of a non-magnetic element with a face-centered cubic (fcc) crystal structure; and (iii) a minor amount of at least one hcp-stabilizing element.

The invention provides an encapsulated [VW12]4-cluster metal organic nanotube micropore crystalline state material, and a preparation method and an application thereof and relates to a multi-acidic group micropore crystalline state material, and a preparation method and the application thereof. The invention aims to solve the problems that the synthesis difficulty of the present multi-acidic group metal-organic frame crystalline state material is high and the effect of detecting iodate according to an electrochemical method is poor. The chemical formula of the encapsulated [VW12]4-cluster metal organic nanotube micropore crystalline state material is [Co2(bimb)2VW12O40].[bimb].5H2O. The method comprises the following steps: 1) preparing a reaction solution; 2) causing the reaction solution react for 3 days in a polytetrafluoroethylene reaction kettle, and then cooling to room temperature. An encapsulated [VW12]4-cluster metal organic nanotube micropore crystalline state material modified carbon paste electrode is taken as an electrocatalyst for reducing potassium iodate and is used for efficiently detecting iodate ions. According to the method provided by the invention, the encapsulated [VW12]4-cluster metal organic nanotube micropore crystalline state material can be acquired.