184 results about "Oxide cathode" patented technology

The present invention provides co-doped zinc oxide to flat panel, light emissive display devices and vacuum microelectronic devices to improve their efficiency and lifetime. This material has a low growth temperature and is compatible with metal oxide semiconductor (MOS) processing technology. It is tranparent, chemically stable and has a low work function, which result in many advantages when being used as the cathode for the aforementioned devices. In one embodiment of the emissive display device, an organic light diode (OLED) display has a high work function metal anode, such as platinum (Pt), gold (Au) or nickel (Ni) and a low work function co-doped zinc oxide cathode. Because of the energy level alignment provided by these two materials, the potential energy barriers to injection of electrons from the cathode and holes from the anode into the organic emissive medium are minimized so the display device operates more efficiently.

The present invention relates to a copper-manganese mixed oxide cathode material, which is suitable for use in a cathode of an electrochemical cell, and which has the formula Mn_xCu_yO_z,.nH₂O, wherein the oxidation state of Cu is between about +1 and about +3, the oxidation state of Mn is between about +2 and about +7, x is equal to about 3−y, y is less than about 3, z is calculated or experimentally determined, using means known in the art, based on the values of x and y, as well as the oxidation states of Mn and Cu, and nH₂O represents the surface and structural water present in the mixed oxide material. The present invention further relates to an electrochemical cell comprising an anode, a cathode, and a separator disposed between the anode and cathode, and an electrolyte in fluid communication with the anode, the cathode and the separator, wherein the cathode comprises the noted cathode material. The present invention still further relates to such an active cathode material, or an alternative cathode material, wherein the copper-manganese mixed oxide comprises a defect spinel-type structure, which is also suitable for use as a cathode component of an alkaline electrochemical cell.

The invention relates to a lithium ion battery which comprises an anode (1), a cathode (2), a diaphragm (3), an electrolyte (4) and an encapsulating material (5); an active material in the positive pole is that a lithium-rich manganese-based solid solution material and other lithium-containing metal oxide cathode materials are simply and physically mixed; the lithium ion battery with high energy density and good cyclic performance can be obtained through controlling the proportion occupied by the lithium-rich manganese-based solid solution material and the size proportion of the lithium-rich manganese-based solid solution material to the other lithium-containing metal oxide cathode materials and activating by utilizing the first charging process of a battery. The lithium ion battery provided by the invention is simple in preparation method, efficient and good in repeatability, and scale production of the lithium ion battery with high energy density can be really realized.

The present invention includes compositions, surface and bulk modifications, and methods of making of (1−x)Li[Li_1/3Mn_2/3]O₂.xLi[Mn_0.5-yNi_0.5-yCo_2y]O₂ cathode materials having an O3 crystal structure with a x value between 0 and 1 and y value between 0 and 0.5, reducing the irreversible capacity loss in the first cycle by surface modification with oxides and bulk modification with cationic and anionic substitutions, and increasing the reversible capacity to close to the theoretical value of insertion/extraction of one lithium per transition metal ion (250-300 mAh/g).

The invention discloses a sodium-ion battery cathode material, and a preparation method and application thereof. The molecular formula of a lithium-sodium-manganese oxide is Li<x>Na<y>M<z>Mn<1-z>O<2>, wherein x is greater than 0.15 and less than 0.5; y is greater than 0.5 and less than 0.9; z is greater than or equal to 0 and less than 0.5; and M is one or more selected from Fe, Ti, Ni, Mg, Cr, Co, Cu and the like. The preparation method of the material comprises the following steps of after sufficiently mixing and uniformly grinding a manganese source, a sodium source and a lithium source or a manganese source, a sodium source, a lithium source and a M source (M is selected from Fe, Ti, Ni, Mg, Cr, Co and Cu), sintering at 400-1100 DEG C for 4-48 h, and naturally cooling the material to 25-120 DEG C so as to obtain the final product. The cathode material disclosed by the invention can provide reversible charging and discharging voltage above 4V; required raw materials are wide in source; and the preparation method is simple.

The disclosed embodiments relate to the manufacture of a precursor co-precipitate material for a cathode active material composition. During manufacture of the precursor co-precipitate material, an aqueous solution containing at least one of a manganese sulfate and a cobalt sulfate is formed. Next, a NH₄OH solution is added to the aqueous solution to form a particulate solution comprising irregular secondary particles of the precursor co-precipitate material. A constant pH in the range of 10-12 is also maintained in the particulate solution by adding a basic solution to the particulate solution.

Composite silicon based materials are described that are effective active materials for lithium ion batteries. The composite materials comprise processed, e.g., high energy mechanically milled, silicon suboxide and graphitic carbon in which at least a portion of the graphitic carbon is exfoliated into graphene sheets. The composite materials have a relatively large surface area, a high specific capacity against lithium, and good cycling with lithium metal oxide cathode materials. The composite materials can be effectively formed with a two step high energy mechanical milling process. In the first milling process, silicon suboxide can be milled to form processed silicon suboxide, which may or may not exhibit crystalline silicon x-ray diffraction. In the second milling step, the processed silicon suboxide is milled with graphitic carbon. Composite materials with a high specific capacity and good cycling can be obtained in particular with balancing of the processing conditions.

The invention relates to a LiMnPO4 clad lithium-rich layered oxide Li[Li(1-2x)/3MxMn(2-x)/3]O2 (M is at least one of Ni or Co, wherein x is more than 0 and not less than 0.33) and a preparation method thereof. The Li[Li(1-2x)/3MxMn(2-x)/3]O2 is dipped in water solution containing Li, Mn and PO43- (the mol ratio is 1: 1: 1), is continuously stirred for 3-8 hours in an opening container at the temperature of 60-90 DEG C to prepare solid powder, then is dried for 2-24 hours at the temperature of 100 DEG C, and is roasted for 5-10 hours at the temperature of 300-600 DEG C to prepare the LiMnPO4 clad lithium-rich layered oxide Li[Li(1-2x)/3MxMn(2-x)/3]O2 cathode material, wherein the mass ratio of the LiMnPO4 to the Li[Li(1-2x)/3MxMn(2-x)/3]O2 is 3-10 wt%. The electrode material prepared by the method has the characteristics of high electrochemical capacity, good circulating stability, excellent rate capacity and the like, and has the advantages of simple preparation process, low cost and good reproducibility.

The invention discloses a micro-sphere compound anode material with a core-shell structure and a preparation method thereof. The compound anode material is a compound micro-sphere with the core-shell structure; the material of the core is a silicon micro-sphere; and the material of the shell layer is formed by uniformly embedding Li1+xV1-xO2 and oxide cathode or metal anode materials in amorphousporous carbon. The preparation method of the compound anode material comprises the following steps of dissolving a lithium source and a vanadium source in deionized water at a constant temperature; adding macromolecule glue and uniformly dispersing by adopting ultrasonic wave; slowly adding in the glue state phase when dispersing the silicon micro-sphere and the oxide cathode or the metal anode material by adopting the ultrasonic wave; and then sequentially carbonizing and combining in the inertia or reducing atmosphere to obtain the core-shell structured compound micro-sphere taking the silicon micro-sphere as the core and the porous amorphous carbon as the shell. The discharging ratio capacity is more than 980mA h/g when the compound micro-sphere material is used at the cathode of the lithium ion battery. And the charging and discharging efficiency at the first time is more than 85%; the capacity conservation rate is more than 92% after the micro-sphere compound anode material is recycled for 500 times.

The invention belongs to the technical field of a sodium ion battery, in particular relates to a quintuple layered oxide cathode material for a sodium ion battery and a preparation method of the quintuple layered oxide cathode material. A single-phase quintuple layered oxide NaNi<m>Fe<n>Co<x>Mn<y>Ti<z>O2 is obtained by uniformly mixing materials of sodium carbonate, nickel oxide, cobalt oxide, ferric oxide, titanium oxide and manganese oxide (or other precursors of manganese oxides only can be generated through high-temperature decomposition) according to stoichiometric ratios, pressing the mixture into a small wafer and placing the small wafer in an electric furnace having oxygen flow and air for high-temperature reaction, wherein m, n, x, y and z are more than 0 and less than 1. When the electrode material is applied to the sodium ion battery, the initial specific capacity reaches 128mAh/g, the average voltage is 3.1V, for Na<+>/Na, the specific energy can reaches 396Wh/kg, and the capacity retention ratio of the electrode after 300 cycles in a 4C rate is 90%. The NaNi<m>Fe<n>Co<x>Mn<y>Ti<z>O2 is high in electrochemical stability, specific capacity, rate performance and cycle performance, and the preparation method is simple and is applicable for the sodium ion battery.

A coated cathode material comprises a lithium metal oxide particulate having a surface at least partially coated with a coating comprised of a complex metal oxide of aluminum and a second metal that is lanthanum, yttria or combination thereof. The coated cathode material may be made by providing a lithium metal oxide particulate which is then contacted with a precursor compound that forms a complex metal oxide upon heating. The coated lithium metal oxide is then heated to a temperature sufficient to form the complex metal oxide, wherein the complex metal oxide is amorphous and contains aluminum and a second metal that is lanthanum, yttria or combination thereof and the complex metal oxide is bonded to the lithium metal oxide.

A layered lithium metal oxide powder for a cathode material used in a rechargeable battery, with the general formula (1−x)[Li_a-bA_b]_3a[CO_1-cM_c]_3b[O_2-d-eN′_e]_6c.xLi₃PO₄, with 0.0001≤x≤0.05, 0.90≤a≤1.10, 0<b+c≤0.1, −0.1≤d≤0.1 and e≤0.05, wherein A and M are one or more elements including at least one of the group consisting of Mg, Ti and Al; wherein N′ is either one or more dopants of the group consisting of F, S, N and P; the powder consisting of a core and an ion-conductive electron-insulating surface layer, the core having a layered crystal structure and the surface layer comprising a mixture of elements of the core material, oxides comprising either one or more elements of the group consisting of Mg, Ti and Al; and Li₃PO₄.

A mixed transition metal oxide is provided described wherein Aluminum is partially substituted for Cobalt in a Li[Ni_xCo_yMn_z]O₂ composition wherein the resulting aluminum substituted product Li[Ni_0.4Co_0.2-yAl_yMn_0.4]O₂ is less costly than the parent product, is safer to use, and provides enhanced electrochemical performance as a cathode material for use in Lithium-ion based batteries.

The invention discloses a preparation method of a lithium-rich layered oxide cathodee material. The chemical formula of the lithium-rich layered oxide cathode material is Li[Li<(1-2x)/3>Ni<x-y>M<2y>Mn<2/3-x/3-y>]O<2>, wherein x is greater than 0 and smaller than 0.5, y is greater than 0 and smaller than x, and M is one or a mixture of two or more than two of Fe, Co, Al and Cr in any proportion. The preparation method of the lithium-rich layered oxide cathode material comprises the following steps: firstly using a high-temperature solid-phase method to prepare an M-doped Li2MnO3 material, then mixing the M-doped Li2MnO3 material with an Li source material, an Ni source material and an Mn source material, and mixing at the temperature of 700 to 950 DEG C and roasting for 5 to 15 h so as to obtain the target object. The material prepared by the invention has the advantages of stable structure, easily controlled conditions, high batch stability and the like, and is suitable for scale production; and a button cell assembled by using the prepared lithium-rich layered oxide cathode material has the advantages of high first-time charging and discharging efficiency, small voltage attenuation, good cycle performance and the like.

The invention relates to a positive electrode of a layered oxide lithium ion battery and a preparation method thereof. The positive electrode includes a pole piece and a carbon layer on the pole piece. The carbon layer is formed by magnetron sputtering under an inert atmosphere using a graphite target The carbon source is formed by sputtering on the surface of the pole piece. The present invention uses the magnetron sputtering method to coat the positive electrode with carbon, which breaks through the limitation of the traditional thermal decomposition method to coat the positive electrode material, and prepares the positive electrode of the carbon-coated lithium-rich layered structure oxide lithium ion battery. By using the carbon layer The effect of effectively preventing the side reaction between the active material and the electrolyte during the charging and discharging process improves the cycle stability and rate performance of the positive electrode of the layered lithium-rich lithium-ion battery. Experiments have found that it can meet the requirements of power lithium-ion batteries.

This invention discloses a lithium metal oxide powder for a cathode material in a rechargeable battery, consisting of a core and a surface layer, the core having a layered crystal structure comprising the elements Li, M and oxygen, wherein M has the formula M=(Ni_z(Ni_1/2Mn_1/2)_yCo_x)_1-kA_k, with 0.15≦x≦0.30, 0.20≦z≦0.55, x+y+z=1 and 0≦k≦0.1, wherein A is a dopant, wherein the Li content is stoichiometrically controlled with a molar ratio 0.95≦Li:M≦1.10; and wherein the surface layer comprises the elements Li, M′ and oxygen, wherein M′ has the formula M′=(Ni_z′(Ni_1/2Mn_1/2)_y′Co_x′)_1-k′A_k′, with x′+y′+z′=1 and 0≦k′≦0.1, and wherein y′/(y′+2z′)≧1.1*[y/(y+2z)]. The surface layer may also comprise at least 3 mol % Al, the Al content in the surface layer 10 being determined by XPS.

The invention relates to composite cathode material for a lithium ion battery and a preparation method thereof, belonging to the chemical power source field. The invention aims to solve the problems that the first lithium ion insertion process of oxide cathode material performs an irreversible reaction, the first coulombic efficiency is low, etc. The preparation method comprises the following steps: using precursor MO, reducing agent metal lithium and a defined amount of organic solvent to perform wet mechanochemical in situ reduction and obtain power, heating the obtained power under vacuum atmosphere to remove organic solvent, and obtaining the composite material. The method of the invention has simple process, low cost and wide application range; and the first efficiency of the prepared composite cathode material is more than 80%, the maximum is more than 95%, and the composite cathode material also has good electrochemical cycle stability.

The invention discloses a niobium-doped lithium-rich manganese-based layered oxide cathode material, which has the chemical formula of Li1.20-XNbxMn0. 54Co0. 13Ni0. 13O2 (0 <= x <= 0. 10). The invention adopts a polymer template method to prepare, the main steps are as follows: the dried cross-linked poly (acrylamide-methacrylic acid) microspheres are immersed in an aqueous solution containing Mn2+, Co2 + and Ni2 + ions of urea, the solution is adsorbed completely, and then heating and drying are performed; the dried microspheres are added into a solution containing lithium salt and niobium salt, heating is performed to remove moisture, and obtaining a lithium-rich cathode material precursor is obtained; the obtained precursor is calcined in air at high temperature to obtain a product-Niobium-doped lithium-rich manganese oxide base cathode material. As that crosslink polymer microsphere is used as a template, the transition metal hydroxide nanoparticle are synthesized in situ, the morphology of the lithium-rich manganese base oxide positive electrode material can be effectively regulated and the electrochemical performance can be greatly improved, and the preparation process of the niobium-doped lithium-rich manganese-based layered oxide cathode material is simple, the particle morphology is good in reproducibility, and the niobium-doped lithium-rich manganese-based layered oxide cathode material is suitable for industrial production.

The invention discloses a preparation method for a lithium-nickel-cobalt-aluminum composite oxide cathode material for a lithium ion battery by using an oxidation process, belongs to the technical field of new energy materials and solves the main technical problem of improving the mass energy density of the cathode material for the lithium-ion battery. The preparation method for the lithium-nickel-cobalt-aluminum composite oxide cathode material for the lithium ion battery particularly comprises the following steps: weighing the materials of a lithium source, nickel-cobalt-aluminum hydroxide and doped modified elements (M) in a certain molar ratio, uniformly mixing, then presintering for 4 to 5h in the range of 400 to 500 DEG C in an atmosphere furnace introduced with oxygen, then rising the temperature to 700 to 850 DEG C and roasting at constant temperature for 10 to 20h, and naturally cooling to obtain the lithium-nickel-cobalt-aluminum composite oxide cathode material. The mass energy density of the lithium-nickel-cobalt-aluminum composite oxide cathode material is more than 1000Wh/kg, and cycle performance of the lithium-nickel-cobalt-aluminum composite oxide cathode materialis excellent. The lithium-nickel-cobalt-aluminum composite oxide cathode material for the lithium ion battery disclosed by the invention is simple in process, low in manufacturing cost, simple in process route, short in cycle, and low in energy consumption, and can be used in scale production.

The invention discloses an organic radical-modified cellulose derivative, as well as a preparation method and an application thereof. The method comprises: dissolving a hydroxyl-containing cellulose derivative in an organic solvent, mixing with a stable nitroxide radical containing carboxyl or acyl chloride, and reacting in the presence of a catalyst to obtain a stable organic radical-modified cellulose derivative; and preparing a cathode material of a lithium ion battery from the organic radical-modified cellulose derivative alone or after blending and doping with the organic radical-modified cellulose derivative with graphene/carbon nanotubes. The cathode material prepared by the method can overcome the disadvantages of a lithium metal oxide cathode material, has second-order charging/discharging performance, and has the advantages of high discharging capacity up to 121% to 167% of the theoretical value, high charging speed, and short charging time (60 seconds). The organic radical-modified cellulose derivative cathode material provided by the invention is free of heavy metals, and has the advantages of no toxicity, environmental protection and biodegradability; and the organic radical-modified cellulose derivative lithium ion battery prepared by the invention has excellent charging/discharging cycle stability.